US20210355068A1 - System and method for manufacturing ester-based composition - Google Patents
System and method for manufacturing ester-based composition Download PDFInfo
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- US20210355068A1 US20210355068A1 US17/443,772 US202117443772A US2021355068A1 US 20210355068 A1 US20210355068 A1 US 20210355068A1 US 202117443772 A US202117443772 A US 202117443772A US 2021355068 A1 US2021355068 A1 US 2021355068A1
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000000203 mixture Substances 0.000 title claims abstract description 34
- 150000002148 esters Chemical class 0.000 title claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims description 74
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 68
- 239000011541 reaction mixture Substances 0.000 claims description 58
- 239000007795 chemical reaction product Substances 0.000 claims description 41
- 238000000926 separation method Methods 0.000 claims description 33
- 239000002253 acid Substances 0.000 claims description 27
- 239000003054 catalyst Substances 0.000 claims description 18
- 238000005809 transesterification reaction Methods 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 238000002347 injection Methods 0.000 description 34
- 239000007924 injection Substances 0.000 description 34
- 239000004014 plasticizer Substances 0.000 description 24
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 description 15
- 230000007613 environmental effect Effects 0.000 description 9
- 239000002994 raw material Substances 0.000 description 9
- 238000005886 esterification reaction Methods 0.000 description 8
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 7
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- 125000002843 carboxylic acid group Chemical group 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 229920000915 polyvinyl chloride Polymers 0.000 description 6
- 239000004800 polyvinyl chloride Substances 0.000 description 6
- 125000004432 carbon atom Chemical group C* 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- QFOHBWFCKVYLES-UHFFFAOYSA-N Butylparaben Chemical compound CCCCOC(=O)C1=CC=C(O)C=C1 QFOHBWFCKVYLES-UHFFFAOYSA-N 0.000 description 4
- BJQHLKABXJIVAM-UHFFFAOYSA-N Diethylhexyl phthalate Natural products CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 4
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- -1 alkyl sulfuric acid Chemical compound 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 4
- FLKPEMZONWLCSK-UHFFFAOYSA-N diethyl phthalate Chemical compound CCOC(=O)C1=CC=CC=C1C(=O)OCC FLKPEMZONWLCSK-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 125000000217 alkyl group Chemical group 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 150000000000 tetracarboxylic acids Chemical class 0.000 description 3
- 150000003628 tricarboxylic acids Chemical class 0.000 description 3
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical compound CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 description 2
- BBMCTIGTTCKYKF-UHFFFAOYSA-N 1-heptanol Chemical compound CCCCCCCO BBMCTIGTTCKYKF-UHFFFAOYSA-N 0.000 description 2
- 241000282412 Homo Species 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- AUYYCJSJGJYCDS-LBPRGKRZSA-N Thyrolar Chemical class IC1=CC(C[C@H](N)C(O)=O)=CC(I)=C1OC1=CC=C(O)C(I)=C1 AUYYCJSJGJYCDS-LBPRGKRZSA-N 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- GCAIEATUVJFSMC-UHFFFAOYSA-N benzene-1,2,3,4-tetracarboxylic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C(C(O)=O)=C1C(O)=O GCAIEATUVJFSMC-UHFFFAOYSA-N 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 229940067596 butylparaben Drugs 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- MWKFXSUHUHTGQN-UHFFFAOYSA-N decan-1-ol Chemical compound CCCCCCCCCCO MWKFXSUHUHTGQN-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 description 2
- 229940088597 hormone Drugs 0.000 description 2
- 239000005556 hormone Substances 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 239000003446 ligand Substances 0.000 description 2
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- ZWRUINPWMLAQRD-UHFFFAOYSA-N nonan-1-ol Chemical compound CCCCCCCCCO ZWRUINPWMLAQRD-UHFFFAOYSA-N 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 230000001850 reproductive effect Effects 0.000 description 2
- 230000009885 systemic effect Effects 0.000 description 2
- 239000005495 thyroid hormone Substances 0.000 description 2
- 229940036555 thyroid hormone Drugs 0.000 description 2
- 230000000699 topical effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BJQHLKABXJIVAM-BGYRXZFFSA-N 1-o-[(2r)-2-ethylhexyl] 2-o-[(2s)-2-ethylhexyl] benzene-1,2-dicarboxylate Chemical compound CCCC[C@H](CC)COC(=O)C1=CC=CC=C1C(=O)OC[C@H](CC)CCCC BJQHLKABXJIVAM-BGYRXZFFSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004803 Di-2ethylhexylphthalate Substances 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000003377 acid catalyst Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 239000003957 anion exchange resin Substances 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- QDHFHIQKOVNCNC-UHFFFAOYSA-N butane-1-sulfonic acid Chemical compound CCCCS(O)(=O)=O QDHFHIQKOVNCNC-UHFFFAOYSA-N 0.000 description 1
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 description 1
- AIYUHDOJVYHVIT-UHFFFAOYSA-M caesium chloride Chemical compound [Cl-].[Cs+] AIYUHDOJVYHVIT-UHFFFAOYSA-M 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 239000003729 cation exchange resin Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- RZIPTXDCNDIINL-UHFFFAOYSA-N cyclohexane-1,1,2,2-tetracarboxylic acid Chemical compound OC(=O)C1(C(O)=O)CCCCC1(C(O)=O)C(O)=O RZIPTXDCNDIINL-UHFFFAOYSA-N 0.000 description 1
- MNUSMUGFHGAOIW-UHFFFAOYSA-N cyclohexane-1,1,2-tricarboxylic acid Chemical compound OC(=O)C1CCCCC1(C(O)=O)C(O)=O MNUSMUGFHGAOIW-UHFFFAOYSA-N 0.000 description 1
- QYQADNCHXSEGJT-UHFFFAOYSA-N cyclohexane-1,1-dicarboxylate;hydron Chemical compound OC(=O)C1(C(O)=O)CCCCC1 QYQADNCHXSEGJT-UHFFFAOYSA-N 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 231100000049 endocrine disruptor Toxicity 0.000 description 1
- 239000000598 endocrine disruptor Substances 0.000 description 1
- CCIVGXIOQKPBKL-UHFFFAOYSA-M ethanesulfonate Chemical compound CCS([O-])(=O)=O CCIVGXIOQKPBKL-UHFFFAOYSA-M 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 239000005003 food packaging material Substances 0.000 description 1
- IREPGQRTQFRMQR-UHFFFAOYSA-N furantetracarboxylic acid Chemical compound OC(=O)C=1OC(C(O)=O)=C(C(O)=O)C=1C(O)=O IREPGQRTQFRMQR-UHFFFAOYSA-N 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000002638 heterogeneous catalyst Substances 0.000 description 1
- 239000011964 heteropoly acid Substances 0.000 description 1
- 239000002815 homogeneous catalyst Substances 0.000 description 1
- 230000003054 hormonal effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229940098779 methanesulfonic acid Drugs 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- UFOIOXZLTXNHQH-UHFFFAOYSA-N oxolane-2,3,4,5-tetracarboxylic acid Chemical compound OC(=O)C1OC(C(O)=O)C(C(O)=O)C1C(O)=O UFOIOXZLTXNHQH-UHFFFAOYSA-N 0.000 description 1
- 239000008029 phthalate plasticizer Substances 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- KCXFHTAICRTXLI-UHFFFAOYSA-N propane-1-sulfonic acid Chemical compound CCCS(O)(=O)=O KCXFHTAICRTXLI-UHFFFAOYSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 1
- 125000005591 trimellitate group Chemical group 0.000 description 1
- VXYADVIJALMOEQ-UHFFFAOYSA-K tris(lactato)aluminium Chemical compound CC(O)C(=O)O[Al](OC(=O)C(C)O)OC(=O)C(C)O VXYADVIJALMOEQ-UHFFFAOYSA-K 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/24—Stationary reactors without moving elements inside
- B01J19/2445—Stationary reactors without moving elements inside placed in parallel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/12—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing organo-metallic compounds or metal hydrides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/008—Feed or outlet control devices
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/03—Preparation of carboxylic acid esters by reacting an ester group with a hydroxy group
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/08—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/48—Separation; Purification; Stabilisation; Use of additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2204/00—Aspects relating to feed or outlet devices; Regulating devices for feed or outlet devices
- B01J2204/002—Aspects relating to feed or outlet devices; Regulating devices for feed or outlet devices the feeding side being of particular interest
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00002—Chemical plants
- B01J2219/00027—Process aspects
- B01J2219/00031—Semi-batch or fed-batch processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00002—Chemical plants
- B01J2219/00027—Process aspects
- B01J2219/00038—Processes in parallel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00164—Controlling or regulating processes controlling the flow
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2231/00—Catalytic reactions performed with catalysts classified in B01J31/00
- B01J2231/40—Substitution reactions at carbon centres, e.g. C-C or C-X, i.e. carbon-hetero atom, cross-coupling, C-H activation or ring-opening reactions
- B01J2231/49—Esterification or transesterification
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
- B01J2531/40—Complexes comprising metals of Group IV (IVA or IVB) as the central metal
- B01J2531/46—Titanium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/12—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing organo-metallic compounds or metal hydrides
- B01J31/122—Metal aryl or alkyl compounds
Definitions
- the present invention relates to a method and a system for manufacturing an ester-based composition which are characterized in sequentially operating a plurality of batch reactors.
- Phthalate-based plasticizers had occupied 92% of the world's plasticizer market by the 20th century (Mustafizur Rahman and Christopher S. Brazel “The plasticizer market: an assessment of traditional plasticizers and research trends to meet new challenges” Progress in Polymer Science 2004, 29, 1223-1248), and are additives used to improve the processability of polyvinyl chloride (hereinafter, referred to as PVC) by imparting flexibility, durability, cold resistance, and the like and lowering viscosity during melting.
- PVC polyvinyl chloride
- Phthalate-based plasticizers are introduced into PVC in various contents and used not only for hard products such as rigid pipes, but also for soft products such as food packaging materials, blood bags, and flooring materials since the phthalate-based plasticizers are soft and stretchable.
- the phthalate-based plasticizers are more closely related to real life than any other materials and are widely used for materials which come into direct contact with a human body.
- terephthalate-based plasticizers not only have an equivalent level of physical properties with phthalate-based plasticizers, but also have been spotlighted as a material free from environmental problems, so that various types of terephthalate-based plasticizers have been developed.
- research on developing terephthalate-based plasticizers with excellent physical properties as well as research on equipment for manufacturing such terephthalate-based plasticizers have been actively conducted, and there has been a demand for more efficient, more economical and simpler process designs in terms of process design.
- An aspect of the present invention provides an efficient method and an efficient system for manufacturing an ester-based composition, the method and the system securing the stability of batch reactors and the efficiency of a semi-continuous process by employing a plurality of batch reactors mainly used in an esterification reaction, connecting the plurality of batch reactors in parallel, and sequentially operating the same such that the entire process is operated semi-continuously.
- a method for manufacturing an ester-based composition including a step S 1 of injecting a polycarboxylic acid and a first alcohol having 3 to 10 alkyl carbon atoms into a mixer to form a reaction mixture, a step S 2 of sequentially injecting the reaction mixture into N number of batch reactors to perform a reaction such that the reaction is sequentially completed in the N number of batch reactors to semi-continuously manufacture reaction products, and a step S 3 of semi-continuously moving the reaction products into a separation unit to remove unreacted alcohol, wherein N is an integer of 3 or greater.
- a system for manufacturing an ester-based composition including a mixer in which a reaction mixture of a polycarboxylic acid and a first alcohol having 3 to 10 alkyl carbon atoms is formed, a reaction unit provided with N number of batch reactors connected in parallel in which an esterification reaction of the reaction mixture is performed and with an outlet line for discharging reaction products from the N number of batch reactors, a supply control unit for controlling the injection amount and the injection path of the reaction mixture such that the reaction mixture is sequentially supplied to the N number of batch reactors from the mixer to allow the reaction to be sequentially completed, and a separation unit for receiving the reaction products and removing unreacted alcohol therefrom, the separating unit including one or more separation columns.
- a manufacturing method and a manufacturing system of the present invention allow a plurality of batch reactors connected in parallel to be sequentially driven such that an entire reaction process is operated semi-continuously, so that it is possible to secure both the stability of a batch reactor and the efficiency of a semi-continuous process.
- FIG. 1 is a process flow diagram illustrating a system for manufacturing an ester-based composition including a mixer, a supply control unit, a reaction unit, and a separation unit according to an embodiment of the present invention
- FIG. 2 is a process flow diagram illustrating a system for manufacturing an ester-based composition including a mixer, a supply control unit, a reaction unit, and a separation unit according to an embodiment of the present invention, wherein the supply control unit is provided inside the mixer;
- FIGS. 3-5 are process flow diagrams each illustrating a system for manufacturing an ester-based composition indicating a path in which a catalyst may be injected, in one embodiment of the present invention.
- FIG. 6 is a process flow diagram illustrating a system for manufacturing an ester-based composition including a mixer, a supply control unit, a reaction unit, a separation unit, and a trans-reaction unit according to an embodiment of the present invention.
- a polycarboxylic acid refers to a compound having two or more carboxylic acid groups, for example, a dicarboxylic acid, a tricarboxylic acid, or a tetracarboxylic acid.
- a polycarboxylic acid used in the present invention may have 2 to 5 carboxylic acid groups, 2 to 4 carboxylic acid groups, or 2 to 3 carboxylic acid groups.
- a polycarboxylic acid has too many carboxylic acid groups, it may not easy to apply the polycarboxylic acid to the manufacturing method or the manufacturing system of the present invention due to a high molecular weight of the polycarboxylic acid itself.
- the polycarboxylic acid is preferably a dicarboxylic acid, a tricarboxylic acid, or a tetracarboxylic acid.
- the dicarboxylic acid may be one or more selected from the group consisting of a linear dicarboxylic acid having 2 to 10 carbon atoms, a terephthalic acid, a phthalic acid, an isophthalic acid, and a cyclohexane dicarboxylic acid
- the tricarboxylic acid may be one or more selected from the group consisting of a citric acid, a trimellitate acid, and a cyclohexane tricarboxylic acid.
- the tetracarboxylic acid may be one or more selected from the group consisting of a benzenetetracarboxylic acid, a furantetracarboxylic acid, a cyclohexane tetracarboxylic acid, and a tetrahydrofuran tetracarboxylic acid.
- the polycarboxylic acid may not only include itself, but also include an anhydride or a derivative thereof.
- the (first/second) alcohol having 3 to 10 alkyl carbon atoms is one or more selected from the group consisting of propanol, butanol, pentanol, hexanol, heptanol, octanol, nonanol and decanol, all of which are of a linear type or a branched type.
- the alcohol may be alcohol of a single type, or may be in the form of a mixture containing isomers having the same number of carbon atoms.
- the alcohol when the alcohol is alcohol having 3 alkyl carbon atoms, the alcohol may be 1-propanol or 2-propanol, or may be in the form of a mixture containing 1-propanol and 2-propanol in a predetermined ratio.
- the alcohol when the alcohol is in the form of a mixture containing isomers having the same number of carbon number, the relative amount of each isomer is not particularly limited.
- the present invention provides a system for manufacturing an ester-based composition, the system including a mixer in which a reaction mixture of a polycarboxylic acid and a first alcohol having 3 to 10 alkyl carbon atoms is formed, a reaction unit provided with N number of batch reactors connected in parallel in which an esterification reaction of the reaction mixture is performed, an inlet line for receiving the reaction mixture from the mixer, and an outlet line for discharging reaction products from the N number of batch reactors, a supply control unit for controlling the injection amount and the injection path of the reaction mixture such that the reaction mixture is sequentially supplied to the N number of batch reactors from the mixer to allow the reaction to be sequentially completed, and a separation unit for receiving the reaction products through the outlet line of the reaction unit and removing unreacted alcohol therefrom.
- the manufacturing system provided by the present invention is a system to be used for executing a manufacturing method of the present invention and includes a mixer 1 , a supply control unit 2 , a reaction unit 3 , and a separation unit 4 .
- the mixer 1 performs the mixing of a polycarboxylic acid 11 and a first alcohol 12 injected into the mixer, and a reaction mixture generated from the mixer passes through the supply control unit 2 to be sequentially injected into each of batch reactors 31 to 3 N included in the reaction unit 3 .
- reaction products are moved to the separation unit 4 , and in the separation unit, unreacted alcohol 42 is removed and an ester-based composition 41 is finally obtained.
- the supply control unit 2 included in the manufacturing system of the present invention serves to determine when to start an injection, how much to inject, and when to complete the injection for each reactor when the reaction mixture is sequentially injected into each reactor from the mixer, thereby enabling the sequential injection of the reaction mixture into each reactor connected in parallel and the discharge of the reaction products.
- the supply control unit may be a separate unit connected to the mixer as shown in FIG. 1 , and may be a unit included in the mixer as shown in FIG. 2 .
- the supply control unit may control the injection path and the injection amount of the reaction mixture directly discharged from the mixer.
- a catalyst 13 may be injected into the polycarboxylic acid, the first alcohol, or the reaction mixture thereof.
- the manufacturing system of the present invention may further include a trans-reaction unit 5 for performing a trans-esterification reaction by adding a second alcohol having 3 to 10 alkyl carbon atoms to the reaction products from which the unreacted alcohol has been removed.
- the second alcohol 52 injected from the trans-reaction unit is different from the first alcohol injected from the mixer, and may pass through the trans-reaction unit to manufacture an ester-based composition 51 including different ester-based compounds.
- At least one among the N number of reactors may be provided with a gas-liquid separation column connected to an upper portion of the reactor and separating alcohol and water discharged through the upper portion of the reactor, a condenser for cooling a gas discharged through an upper line of the gas-liquid separation column, and a decanter for separating a liquid discharged through a lower line of the gas-liquid separation column and a liquid condensed in the condenser into different layers and recirculating the alcohol into the reactor.
- the reactor when the reactor is provided with the gas-liquid separation column, the condenser, and the decanter, it is possible to increase the efficiency and economic feasibility of the reaction by re-liquefying alcohol vaporized during the reaction and re-injecting the re-liquefied alcohol into the reactor, and at the same time, it is possible to allow the reaction to proceed towards a forward reaction by removing water, which is a by-product of an esterification reaction, that is, allowing a high conversion rate to be achieved.
- the supply control unit in the manufacturing system provided by the present invention may control one or more selected from the injection path and the injection flow rate of the reaction mixture to be changed according a predetermined time interval.
- the supply control unit in the manufacturing system of the present invention should determine the injection path and the injection flow rate of the reaction mixture such that N number of reactors may operate sequentially and set a time interval which is determined in consideration of the reaction duration, the total number of reactors, and the desired production amount, and the like. If the injection path and the injection flow rate of the reaction mixture is controlled at the predetermined time interval, at the time when the reaction products are all or almost discharged after the reaction is completed in each reactor, the reaction mixture is started to be injected back into a corresponding reactor, so that all of the reactors may be operated without being stopped, and the efficiency of the process may be increased.
- the time interval set in the supply control unit may be 50%, 60%, 70%, 80%, 90% or greater, or 150%, 140%, 130%, 120%, 110% or less of a value obtained by dividing the reaction duration in one reactor by N.
- the time interval is set in the above-described range, It is possible to minimize the loss of reactors not operating.
- the above-described reaction duration is a sum of the amount of time consumed for the reaction and the amount of time consumed for the injection of the reaction mixture and the discharge of the reaction products. For example, when 30 minutes are consumed for the reaction, and 15 minutes are consumed for each of the injection of the reaction mixture and the discharge of the reaction products, the reaction duration is 60 minutes. In this case, if there are four reactors, the injection time interval for each reactor is 15 minutes, so that the reaction mixture is injected into each reactor every 15 minutes.
- the present invention provides a method for manufacturing an ester-based composition, the method including a step S 1 of injecting a polycarboxylic acid and a first alcohol having 3 to 10 alkyl carbon atoms into a mixer to form a reaction mixture, a step S 2 of sequentially injecting the reaction mixture into N number of batch reactors to perform a reaction such that the reaction is sequentially completed in the N number of batch reactors to semi-continuously manufacture reaction products, and a step S 3 of semi-continuously moving the reaction products into a separation unit to remove unreacted alcohol, wherein N is an integer of 3 or greater.
- the manufacturing method of the present invention includes the step S 1 of injecting a polycarboxylic acid and a first alcohol having 3 to 10 alkyl carbon atoms into a mixer to form a reaction mixture.
- the step S 1 for forming the reaction mixture is a step of uniformly mixing the polycarboxylic acid and the first alcohol having 3 to 10 carbon atoms in the mixer.
- the polycarboxylic acid and the first alcohol having 3 to 10 carbon atoms are uniformly pre-mixed in the mixer, so that it is possible to solve a non-uniform reaction which may occur when the raw materials are directly injected into the reactor.
- the reactor used in the present invention is a batch reactor
- reaction raw materials when reaction raw materials are not pre-mixed before being injected into the reactor, depending on a position inside the reactor, the non-uniformity of the raw materials may be greatly increased, and when stirring is performed poorly inside the reactor, some raw materials may be accumulated in particular, and thus, it may be difficult to secure uniform reaction duration and a uniform conversion rate.
- reaction raw materials when reaction raw materials are pre-mixed and then injected, it is possible to obtain a substantially uniform reaction degree over the entire region of the reactor, and the reaction rate of each reactor may be maintained to be substantially uniform to secure the stability of the entire process.
- the step S 1 may further include a step in which the reaction mixture is heated to 50-200° C., preferably 60-190° C., more preferably 70-180° C. Since the reaction mixture is heated in the step S 2 after the step S 1 and then subjected to a reaction, when the reaction mixture is pre-heated and then injected into a reactor, the reaction mixture may be reacted easily and fast in the reactor. However, if an elevated temperature in the step S 1 is too low, the effect of pre-heating before injection is poor. If heated to an excessively high temperature and injected into a reactor, the polycarboxylic acid and the first alcohol having 3 to 10 alkyl carbon atoms are vaporized and the like, so that a uniform reaction may not rather proceed.
- the method for manufacturing an ester-based composition of the present invention includes the step S 2 of sequentially injecting the reaction mixture into N number of batch reactors to perform a reaction such that the reaction is sequentially completed in the N number of batch reactors to semi-continuously manufacture reaction products.
- the reactor In the case of a reaction process in which a typical batch reactor is used, although a large amount of reaction products could be stably manufactured at one time, the reactor is not operated during a process in which reaction raw materials are injected or the reaction products are discharged, so that there is a disadvantage in terms of the efficiency of the entire process. Therefore, the present inventors have invented a method for manufacturing an ester-based composition, the method in which a plurality of batch reactors are sequentially used, so that reaction products are semi-continuously manufactured while the stability of the batch reactor is still maintained.
- the reaction mixture is sequentially injected into the N number of batch reactors, and each reactor into which the reaction mixture is injected is heated to complete a reaction. After the reaction is completed, each reactor also sequentially discharges reaction products.
- step S 2 may be performed in the following manner:
- a reaction mixture uniformly mixed in a mixer is injected into a first reactor, and after a predetermined amount of the reaction mixture is injected into the first reactor, the injection is stopped.
- the first reactor is heated to perform a reaction, and the mixer injects the reaction mixture into a second reactor.
- N number of reactors sequentially manufacture reaction products in the above manner, and after the reaction mixture is injected into an N-th reactor, the reaction mixture is injected back into the first reactor. Also, reaction products manufactured after the reaction is completed are sequentially discharged in the same manner.
- a time interval between the injection into each reactor that is, a time interval of the sequential injection is 90% to 110%, preferably 100% of a value obtained by dividing the total reaction duration by the number of reactors.
- the above-described reaction duration is a sum of the amount of time consumed for the reaction and the amount of time consumed for the injection of the reaction mixture and the discharge of the reaction products. For example, when 30 minutes are consumed for the reaction, and 15 minutes are consumed for each of the injection of the reaction mixture and the discharge of the reaction products, the reaction duration is 60 minutes. In this case, if there are four reactors, the injection time interval for each reactor is 15 minutes, so that the reaction mixture is injected into each reactor every 15 minutes.
- N is preferably an integer of 3 or greater.
- N may be an integer of 3 to 10, an integer of 3 to 7, or an integer of 3 to 5.
- additional apparatuses including a control unit for controlling a reaction mixture to be injected into each reactor in order and reaction products to be discharged from each reactor.
- reaction duration per one reactor may be shorter than the sum of the amount of injection time of the raw materials injected into a reactor and the amount of discharge time of a reaction products, so that there may be time during which the reactor does not operate before receiving raw materials, which may result in adverse effects on productivity.
- the space required for the placement of each reactor becomes also excessive, which may be inefficient in terms of the costs for the entire process.
- an esterification reaction of the polycarboxylic acid and the first alcohol having 3 to 10 alkyl carbon atoms is performed.
- An esterification reaction refers to a reaction which a hydroxy group of first alcohol and a carboxylic acid group of a polycarboxylic acid are reacted, thereby forming an ester bond.
- the esterification reaction of the step S 2 may be performed at 130-250° C., preferably 140-240° C., more preferably 150-230° C.
- an elevated temperature in the step S 2 is lower than the above range, energy required for the reaction is not sufficiently supplied, so that the reaction may not proceed to a sufficient degree.
- higher than the above range vaporization of reaction mixture components, or the like occurs during the reaction as in the step S 1 , and thus, reaction products may not be manufactured to a sufficient amount.
- the manufacturing method of the present invention includes the step S 3 of semi-continuously moving the reaction products into a separation unit to remove unreacted alcohol.
- reaction products manufactured in each of the N number of batch reactors are semi-continuously moved to a separation unit, and then, unreacted alcohol is removed in the separation unit.
- the injection of the reaction mixture into the N number of batch reactors may be sequentially performed, the discharge of the reaction products manufactured in each reactor may be also sequentially, or semi-continuously, performed.
- the separation unit used in the step S 3 may include one or more separation columns. Depending on the number of stages of the separation column included in the separation unit in the manufacturing method of the present invention, the composition ratio of a composition to be finally manufactured may vary. Those skilled in the art may appropriately adjust the number of stages of the separation column included in the separation unit according to the composition ratio or properties of the composition to be manufactured.
- the separation unit may include a purification tank of a drum type in addition to the separation column. The separation unit may remove the amount of unreacted alcohol included in the reaction products to a level of 30% or less, preferably 20% or less, more preferably 10% or less of the total. Since the unreacted alcohol is removed as described above, the physical properties of an ester-based composition to be manufactured may be uniform and excellent.
- the separation column is operated continuously in terms of production management, and to this end, the reaction products discharged from each reactor may temporarily stay in a piece of equipment such as a tank before being injected into the separation column.
- the reaction products including the unreacted alcohol may stay in the equipment for about 0.1-10 hours, and the size of the equipment is not limited as long as the reaction products are stably and continuously supplied to the separation column.
- the manufacturing method of the present invention may further include a step S 1 - 1 of adding a catalyst to the reaction mixture between the step S 1 and the step S 2 , or a step S 1 - 2 of adding a catalyst to a polycarboxylic acid and a first alcohol having 3 to 10 alkyl carbon atoms before the step S 1 .
- a catalyst In the esterification reaction of the first alcohol and the carboxylic acid, a catalyst may be used, and when a catalyst is used, there is an advantage in that the reaction may be completed faster.
- the catalyst may be injected to a mixture of a polycarboxylic acid and a first alcohol, or to each of a polycarboxylic acid and a first alcohol before a mixture thereof is prepared. Particularly, it is preferable that the catalyst is added directly to the first alcohol in terms of the efficiency of the entire process.
- the catalyst used in the manufacturing method of the present invention may be one or more selected from an acid catalyst such as sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, paratoluenesulfonic acid, methanesulfonic acid, ethanesulfonic acid, propanesulfonic acid, butanesulfonic acid, and alkyl sulfuric acid, a metal salt such as aluminum lactate, lithium fluoride, potassium chloride, cesium chloride, calcium chloride, iron chloride, and phosphoric acid, a metal oxide such as heteropoly acid, a natural/synthetic zeolite, a cation and anion exchange resin, and an organic metal such as tetraalkyl titanate and a polymer thereof, and may preferably be tetraalkyl titanate.
- an acid catalyst such as sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, paratoluenesulfonic acid, methanesulf
- TiPT, TnBT, TEHT, or the like may be used, and it is preferable to use tetraalkyl titanate having an alkyl group same as the alkyl group of the first alcohol having 3 to 10 alkyl carbon atoms as a ligand.
- a catalyst having the same alkyl group as a ligand it is preferable because catalyst by-products which may be generated in a subsequent process are controlled or not generated.
- the amount of a catalyst to be used may vary depending on the kind of the catalyst.
- a homogeneous catalyst may be used in an amount range of 0.001-5 wt %, 0.001-4 wt %, 0.01-3 wt %, or 0.01-2 wt % based on 100 wt % of the reaction mixture
- a heterogeneous catalyst may be used in an amount range of 5-200 wt %, 5-150 wt %, 10-150 wt %, or 20-150 wt % based on the total weight of the reaction mixture.
- the manufacturing method of the present invention may further include a step S 4 of injecting a second alcohol having 3 to 10 alkyl carbon atoms into the reaction products from which the unreacted alcohol is removed to perform a trans-esterification reaction, wherein the second alcohol injected herein is different from the first alcohol injected in the step S 1 .
- step S 4 it is possible to manufacture a composition including two or more types of ester compounds.
- suitable alcohol according to the type of an ester compound to be included in the composition and perform a trans-esterification reaction. It is preferable that the step S 4 is performed after the removal of unreacted alcohol.
- a trans-esterification reaction with newly injected second alcohol may not be easily performed due to the remaining unreacted alcohol, and even the reaction is performed to a certain degree, the alcohol content is too high to deteriorate the efficiency of the reaction. Therefore, it is preferable that the amount of the unreacted alcohol included in the reaction products before the trans-esterification reaction is 10% or less.
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Abstract
The present disclosure relates to a method and a system for manufacturing an ester-based composition which are characterized in sequentially operating a plurality of batch reactors, and since an ester-based composition is semi-continuously manufactured, the productivity is high and the stability of a batch reactor is secured.
Description
- This application claims the benefit of and priority to Korean Application No. 10-2019-0039716, filed on Apr. 4, 2019, and Korean Application No. 10-2020-0038458, filed on Mar. 30, 2020, all of which are hereby incorporated by reference in their entirety for all purposes as if fully set forth herein.
- The present invention relates to a method and a system for manufacturing an ester-based composition which are characterized in sequentially operating a plurality of batch reactors.
- Phthalate-based plasticizers had occupied 92% of the world's plasticizer market by the 20th century (Mustafizur Rahman and Christopher S. Brazel “The plasticizer market: an assessment of traditional plasticizers and research trends to meet new challenges” Progress in Polymer Science 2004, 29, 1223-1248), and are additives used to improve the processability of polyvinyl chloride (hereinafter, referred to as PVC) by imparting flexibility, durability, cold resistance, and the like and lowering viscosity during melting. Phthalate-based plasticizers are introduced into PVC in various contents and used not only for hard products such as rigid pipes, but also for soft products such as food packaging materials, blood bags, and flooring materials since the phthalate-based plasticizers are soft and stretchable. Thus, the phthalate-based plasticizers are more closely related to real life than any other materials and are widely used for materials which come into direct contact with a human body.
- However, despite the compatibility with PVC and excellent softness imparting properties of phthalate-based plasticizers, there has been controversy over the harmful nature of the phthalate-based plasticizers in that when a PVC product containing a phthalate-based plasticizer is used in real life, the phthalate-based plasticizer may be leaked little by little out of the product and act as a suspected endocrine disruptor (environmental hormone) and a carcinogen to the level of a heavy metal (N R Janjua et al. “Systemic Uptake of Diethyl Phthalate, Dibutyl Phthalate, and Butyl Paraben Following Whole-body Topical Application and Reproductive and Thyroid Hormone Levels in Humans” Environmental Science and Technology 2007, 41, 5564-5570). Particularly, since a report was published in the 1960s in the United States that diethylhexyl phthalate (di-(2-ethylhexyl) phthalate, DEHP), the most used phthalate plasticizer, leaked out of PVC products, global environmental regulations have started to be implemented in addition to various studies on the harmful nature of the phthalate-based plasticizer on human bodies, boosted by increasing interest in environmental hormones in the 1990s.
- Thus, in order to respond to environmental hormonal problems and environmental regulations due to the leakage of phthalate-based plasticizers, many researchers have been conducting research in order to develop a new non-phthalate-based alternative plasticizer without phthalic anhydride used in the manufacturing of phthalate-based plasticizers, or to develop a leakage suppression technology which suppresses the leakage of phthalate-based plasticizers, thereby significantly reducing risks to human bodies and which meets environmental standards.
- Meanwhile, as non-phthalate-based plasticizers, terephthalate-based plasticizers not only have an equivalent level of physical properties with phthalate-based plasticizers, but also have been spotlighted as a material free from environmental problems, so that various types of terephthalate-based plasticizers have been developed. In addition, research on developing terephthalate-based plasticizers with excellent physical properties as well as research on equipment for manufacturing such terephthalate-based plasticizers have been actively conducted, and there has been a demand for more efficient, more economical and simpler process designs in terms of process design.
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- (Patent Document 1) Korean Patent Laid-Open Publication No. 10-1354141
- (Non-patent Document 1) Mustafizur Rahman and Christopher S. Brazel “The plasticizer market: an assessment of traditional plasticizers and research trends to meet new challenges” Progress in Polymer Science 2004, 29, 1223-1248
- (Non-patent Document 2) N. R. Janjua et al. “Systemic Uptake of Diethyl Phthalate, Dibutyl Phthalate, and Butyl Paraben Following Whole-body Topical Application and Reproductive and Thyroid Hormone Levels in Humans” Environmental Science and Technology 2007, 41, 5564-5570
- An aspect of the present invention provides an efficient method and an efficient system for manufacturing an ester-based composition, the method and the system securing the stability of batch reactors and the efficiency of a semi-continuous process by employing a plurality of batch reactors mainly used in an esterification reaction, connecting the plurality of batch reactors in parallel, and sequentially operating the same such that the entire process is operated semi-continuously.
- According to an aspect of the present invention, there is provided a method for manufacturing an ester-based composition, the method including a step S1 of injecting a polycarboxylic acid and a first alcohol having 3 to 10 alkyl carbon atoms into a mixer to form a reaction mixture, a step S2 of sequentially injecting the reaction mixture into N number of batch reactors to perform a reaction such that the reaction is sequentially completed in the N number of batch reactors to semi-continuously manufacture reaction products, and a step S3 of semi-continuously moving the reaction products into a separation unit to remove unreacted alcohol, wherein N is an integer of 3 or greater.
- According to another aspect of the present invention, there is provided a system for manufacturing an ester-based composition, the system including a mixer in which a reaction mixture of a polycarboxylic acid and a first alcohol having 3 to 10 alkyl carbon atoms is formed, a reaction unit provided with N number of batch reactors connected in parallel in which an esterification reaction of the reaction mixture is performed and with an outlet line for discharging reaction products from the N number of batch reactors, a supply control unit for controlling the injection amount and the injection path of the reaction mixture such that the reaction mixture is sequentially supplied to the N number of batch reactors from the mixer to allow the reaction to be sequentially completed, and a separation unit for receiving the reaction products and removing unreacted alcohol therefrom, the separating unit including one or more separation columns.
- A manufacturing method and a manufacturing system of the present invention allow a plurality of batch reactors connected in parallel to be sequentially driven such that an entire reaction process is operated semi-continuously, so that it is possible to secure both the stability of a batch reactor and the efficiency of a semi-continuous process.
- The following drawings attached to the specification illustrate preferred examples of the present invention by example, and serve to enable technical concepts of the present invention to be further understood together with detailed description of the invention given below, and therefore the present invention should not be interpreted only with matters in such drawings.
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FIG. 1 is a process flow diagram illustrating a system for manufacturing an ester-based composition including a mixer, a supply control unit, a reaction unit, and a separation unit according to an embodiment of the present invention; -
FIG. 2 is a process flow diagram illustrating a system for manufacturing an ester-based composition including a mixer, a supply control unit, a reaction unit, and a separation unit according to an embodiment of the present invention, wherein the supply control unit is provided inside the mixer; -
FIGS. 3-5 are process flow diagrams each illustrating a system for manufacturing an ester-based composition indicating a path in which a catalyst may be injected, in one embodiment of the present invention; and -
FIG. 6 is a process flow diagram illustrating a system for manufacturing an ester-based composition including a mixer, a supply control unit, a reaction unit, a separation unit, and a trans-reaction unit according to an embodiment of the present invention. - Hereinafter, the present invention will be described in more detail.
- It will be understood that words or terms used in the specification and claims of the present invention shall not be construed as being limited to having the meaning defined in commonly used dictionaries. It will be further understood that the words or terms should be interpreted as having meanings that are consistent with their meanings in the context of the relevant art and the technical idea of the invention, based on the principle that an inventor may properly define the meaning of the words or terms to best explain the invention.
- In a manufacturing method and a manufacturing system of the present invention, a polycarboxylic acid refers to a compound having two or more carboxylic acid groups, for example, a dicarboxylic acid, a tricarboxylic acid, or a tetracarboxylic acid. A polycarboxylic acid used in the present invention may have 2 to 5 carboxylic acid groups, 2 to 4 carboxylic acid groups, or 2 to 3 carboxylic acid groups. When a polycarboxylic acid has too many carboxylic acid groups, it may not easy to apply the polycarboxylic acid to the manufacturing method or the manufacturing system of the present invention due to a high molecular weight of the polycarboxylic acid itself. The polycarboxylic acid is preferably a dicarboxylic acid, a tricarboxylic acid, or a tetracarboxylic acid. The dicarboxylic acid may be one or more selected from the group consisting of a linear dicarboxylic acid having 2 to 10 carbon atoms, a terephthalic acid, a phthalic acid, an isophthalic acid, and a cyclohexane dicarboxylic acid, and the tricarboxylic acid may be one or more selected from the group consisting of a citric acid, a trimellitate acid, and a cyclohexane tricarboxylic acid. The tetracarboxylic acid may be one or more selected from the group consisting of a benzenetetracarboxylic acid, a furantetracarboxylic acid, a cyclohexane tetracarboxylic acid, and a tetrahydrofuran tetracarboxylic acid. In addition, the polycarboxylic acid may not only include itself, but also include an anhydride or a derivative thereof.
- In the manufacturing method and the manufacturing system of the present invention, it is preferable that the (first/second) alcohol having 3 to 10 alkyl carbon atoms is one or more selected from the group consisting of propanol, butanol, pentanol, hexanol, heptanol, octanol, nonanol and decanol, all of which are of a linear type or a branched type. In addition, the alcohol may be alcohol of a single type, or may be in the form of a mixture containing isomers having the same number of carbon atoms. For example, when the alcohol is alcohol having 3 alkyl carbon atoms, the alcohol may be 1-propanol or 2-propanol, or may be in the form of a mixture containing 1-propanol and 2-propanol in a predetermined ratio. When the alcohol is in the form of a mixture containing isomers having the same number of carbon number, the relative amount of each isomer is not particularly limited.
- System for Manufacturing Ester-Based Composition
- The present invention provides a system for manufacturing an ester-based composition, the system including a mixer in which a reaction mixture of a polycarboxylic acid and a first alcohol having 3 to 10 alkyl carbon atoms is formed, a reaction unit provided with N number of batch reactors connected in parallel in which an esterification reaction of the reaction mixture is performed, an inlet line for receiving the reaction mixture from the mixer, and an outlet line for discharging reaction products from the N number of batch reactors, a supply control unit for controlling the injection amount and the injection path of the reaction mixture such that the reaction mixture is sequentially supplied to the N number of batch reactors from the mixer to allow the reaction to be sequentially completed, and a separation unit for receiving the reaction products through the outlet line of the reaction unit and removing unreacted alcohol therefrom.
- The manufacturing system provided by the present invention is a system to be used for executing a manufacturing method of the present invention and includes a
mixer 1, asupply control unit 2, areaction unit 3, and aseparation unit 4. - As shown in
FIG. 1 , themixer 1 performs the mixing of apolycarboxylic acid 11 and afirst alcohol 12 injected into the mixer, and a reaction mixture generated from the mixer passes through thesupply control unit 2 to be sequentially injected into each ofbatch reactors 31 to 3N included in thereaction unit 3. When a reaction is completed in each reactor, reaction products are moved to theseparation unit 4, and in the separation unit,unreacted alcohol 42 is removed and an ester-basedcomposition 41 is finally obtained. - Particularly, the
supply control unit 2 included in the manufacturing system of the present invention serves to determine when to start an injection, how much to inject, and when to complete the injection for each reactor when the reaction mixture is sequentially injected into each reactor from the mixer, thereby enabling the sequential injection of the reaction mixture into each reactor connected in parallel and the discharge of the reaction products. - The supply control unit may be a separate unit connected to the mixer as shown in
FIG. 1 , and may be a unit included in the mixer as shown inFIG. 2 . When the supply control unit is included in the mixer, the supply control unit may control the injection path and the injection amount of the reaction mixture directly discharged from the mixer. - Also, as shown in
FIG. 3 ,FIG. 4 , orFIG. 5 , in the manufacturing system of the present invention, acatalyst 13 may be injected into the polycarboxylic acid, the first alcohol, or the reaction mixture thereof. - As shown in
FIG. 6 , the manufacturing system of the present invention may further include a trans-reaction unit 5 for performing a trans-esterification reaction by adding a second alcohol having 3 to 10 alkyl carbon atoms to the reaction products from which the unreacted alcohol has been removed. Thesecond alcohol 52 injected from the trans-reaction unit is different from the first alcohol injected from the mixer, and may pass through the trans-reaction unit to manufacture an ester-basedcomposition 51 including different ester-based compounds. - In addition, in the manufacturing system provided by the present invention, at least one among the N number of reactors may be provided with a gas-liquid separation column connected to an upper portion of the reactor and separating alcohol and water discharged through the upper portion of the reactor, a condenser for cooling a gas discharged through an upper line of the gas-liquid separation column, and a decanter for separating a liquid discharged through a lower line of the gas-liquid separation column and a liquid condensed in the condenser into different layers and recirculating the alcohol into the reactor.
- As described above, when the reactor is provided with the gas-liquid separation column, the condenser, and the decanter, it is possible to increase the efficiency and economic feasibility of the reaction by re-liquefying alcohol vaporized during the reaction and re-injecting the re-liquefied alcohol into the reactor, and at the same time, it is possible to allow the reaction to proceed towards a forward reaction by removing water, which is a by-product of an esterification reaction, that is, allowing a high conversion rate to be achieved.
- Also, the supply control unit in the manufacturing system provided by the present invention may control one or more selected from the injection path and the injection flow rate of the reaction mixture to be changed according a predetermined time interval.
- The supply control unit in the manufacturing system of the present invention should determine the injection path and the injection flow rate of the reaction mixture such that N number of reactors may operate sequentially and set a time interval which is determined in consideration of the reaction duration, the total number of reactors, and the desired production amount, and the like. If the injection path and the injection flow rate of the reaction mixture is controlled at the predetermined time interval, at the time when the reaction products are all or almost discharged after the reaction is completed in each reactor, the reaction mixture is started to be injected back into a corresponding reactor, so that all of the reactors may be operated without being stopped, and the efficiency of the process may be increased.
- In addition, the time interval set in the supply control unit may be 50%, 60%, 70%, 80%, 90% or greater, or 150%, 140%, 130%, 120%, 110% or less of a value obtained by dividing the reaction duration in one reactor by N. When the time interval is set in the above-described range, It is possible to minimize the loss of reactors not operating.
- Meanwhile, the above-described reaction duration is a sum of the amount of time consumed for the reaction and the amount of time consumed for the injection of the reaction mixture and the discharge of the reaction products. For example, when 30 minutes are consumed for the reaction, and 15 minutes are consumed for each of the injection of the reaction mixture and the discharge of the reaction products, the reaction duration is 60 minutes. In this case, if there are four reactors, the injection time interval for each reactor is 15 minutes, so that the reaction mixture is injected into each reactor every 15 minutes.
- Method for Manufacturing Ester-Based Composition
- The present invention provides a method for manufacturing an ester-based composition, the method including a step S1 of injecting a polycarboxylic acid and a first alcohol having 3 to 10 alkyl carbon atoms into a mixer to form a reaction mixture, a step S2 of sequentially injecting the reaction mixture into N number of batch reactors to perform a reaction such that the reaction is sequentially completed in the N number of batch reactors to semi-continuously manufacture reaction products, and a step S3 of semi-continuously moving the reaction products into a separation unit to remove unreacted alcohol, wherein N is an integer of 3 or greater.
- Mixing Step (S1)
- The manufacturing method of the present invention includes the step S1 of injecting a polycarboxylic acid and a first alcohol having 3 to 10 alkyl carbon atoms into a mixer to form a reaction mixture.
- Specifically, the step S1 for forming the reaction mixture is a step of uniformly mixing the polycarboxylic acid and the first alcohol having 3 to 10 carbon atoms in the mixer. In the present step, before the polycarboxylic acid and the first alcohol having 3 to 10 carbon atoms, which correspond to reaction raw materials, are injected into a reactor, the polycarboxylic acid and the first alcohol having 3 to 10 carbon atoms are uniformly pre-mixed in the mixer, so that it is possible to solve a non-uniform reaction which may occur when the raw materials are directly injected into the reactor. Particularly, since the reactor used in the present invention is a batch reactor, when reaction raw materials are not pre-mixed before being injected into the reactor, depending on a position inside the reactor, the non-uniformity of the raw materials may be greatly increased, and when stirring is performed poorly inside the reactor, some raw materials may be accumulated in particular, and thus, it may be difficult to secure uniform reaction duration and a uniform conversion rate. However, when reaction raw materials are pre-mixed and then injected, it is possible to obtain a substantially uniform reaction degree over the entire region of the reactor, and the reaction rate of each reactor may be maintained to be substantially uniform to secure the stability of the entire process.
- In the manufacturing method of the present invention, the step S1 may further include a step in which the reaction mixture is heated to 50-200° C., preferably 60-190° C., more preferably 70-180° C. Since the reaction mixture is heated in the step S2 after the step S1 and then subjected to a reaction, when the reaction mixture is pre-heated and then injected into a reactor, the reaction mixture may be reacted easily and fast in the reactor. However, if an elevated temperature in the step S1 is too low, the effect of pre-heating before injection is poor. If heated to an excessively high temperature and injected into a reactor, the polycarboxylic acid and the first alcohol having 3 to 10 alkyl carbon atoms are vaporized and the like, so that a uniform reaction may not rather proceed.
- Reaction Step (S2)
- The method for manufacturing an ester-based composition of the present invention includes the step S2 of sequentially injecting the reaction mixture into N number of batch reactors to perform a reaction such that the reaction is sequentially completed in the N number of batch reactors to semi-continuously manufacture reaction products.
- In the case of a reaction process in which a typical batch reactor is used, although a large amount of reaction products could be stably manufactured at one time, the reactor is not operated during a process in which reaction raw materials are injected or the reaction products are discharged, so that there is a disadvantage in terms of the efficiency of the entire process. Therefore, the present inventors have invented a method for manufacturing an ester-based composition, the method in which a plurality of batch reactors are sequentially used, so that reaction products are semi-continuously manufactured while the stability of the batch reactor is still maintained.
- Specifically, in the step S2 of the manufacturing method of the present invention, the reaction mixture is sequentially injected into the N number of batch reactors, and each reactor into which the reaction mixture is injected is heated to complete a reaction. After the reaction is completed, each reactor also sequentially discharges reaction products.
- For example, the step S2 may be performed in the following manner:
- 1) A reaction mixture uniformly mixed in a mixer is injected into a first reactor, and after a predetermined amount of the reaction mixture is injected into the first reactor, the injection is stopped.
- 2) After the injection is stopped, the first reactor is heated to perform a reaction, and the mixer injects the reaction mixture into a second reactor.
- 3) After a predetermined amount of the reaction mixture is injected into the second reactor, the injection is stopped. After this point, the second reactor is heated to perform a reaction, and the mixer injects the reaction mixture into a third reactor.
- 4) N number of reactors sequentially manufacture reaction products in the above manner, and after the reaction mixture is injected into an N-th reactor, the reaction mixture is injected back into the first reactor. Also, reaction products manufactured after the reaction is completed are sequentially discharged in the same manner.
- In the step S2, a time interval between the injection into each reactor, that is, a time interval of the sequential injection is 90% to 110%, preferably 100% of a value obtained by dividing the total reaction duration by the number of reactors. When the reaction mixture is injected into each reactor at the above interval, at the time when the reaction products are all or almost discharged after the reaction is completed in each reactor, the reaction mixture is started to be injected back into a corresponding reactor, so that all of the reactors may be operated without being stopped and the efficiency of the process may be increased.
- The above-described reaction duration is a sum of the amount of time consumed for the reaction and the amount of time consumed for the injection of the reaction mixture and the discharge of the reaction products. For example, when 30 minutes are consumed for the reaction, and 15 minutes are consumed for each of the injection of the reaction mixture and the discharge of the reaction products, the reaction duration is 60 minutes. In this case, if there are four reactors, the injection time interval for each reactor is 15 minutes, so that the reaction mixture is injected into each reactor every 15 minutes.
- In the manufacturing method of the present invention, in the step S2, the injection of the reaction mixture into a reactor, heating, a reaction, and the discharge of reaction products are all performed at the same time, so that at least one of a plurality of reactors should receive the reaction mixture, at least another one of the plurality of reactors should perform the reaction, and at least another one of the plurality of reactors should discharge the reaction products. Therefore, N is preferably an integer of 3 or greater.
- Particularly, N may be an integer of 3 to 10, an integer of 3 to 7, or an integer of 3 to 5. If there are too many reactors, a variety of additional apparatuses are needed, including a control unit for controlling a reaction mixture to be injected into each reactor in order and reaction products to be discharged from each reactor. Furthermore, reaction duration per one reactor may be shorter than the sum of the amount of injection time of the raw materials injected into a reactor and the amount of discharge time of a reaction products, so that there may be time during which the reactor does not operate before receiving raw materials, which may result in adverse effects on productivity. In addition, the space required for the placement of each reactor becomes also excessive, which may be inefficient in terms of the costs for the entire process.
- In the step S2 of the manufacturing method of the present invention, an esterification reaction of the polycarboxylic acid and the first alcohol having 3 to 10 alkyl carbon atoms is performed. An esterification reaction refers to a reaction which a hydroxy group of first alcohol and a carboxylic acid group of a polycarboxylic acid are reacted, thereby forming an ester bond. The esterification reaction of the step S2 may be performed at 130-250° C., preferably 140-240° C., more preferably 150-230° C. When an elevated temperature in the step S2 is lower than the above range, energy required for the reaction is not sufficiently supplied, so that the reaction may not proceed to a sufficient degree. When higher than the above range, vaporization of reaction mixture components, or the like occurs during the reaction as in the step S1, and thus, reaction products may not be manufactured to a sufficient amount.
- Separation Step (S3)
- The manufacturing method of the present invention includes the step S3 of semi-continuously moving the reaction products into a separation unit to remove unreacted alcohol.
- Specifically, in the step S3, reaction products manufactured in each of the N number of batch reactors are semi-continuously moved to a separation unit, and then, unreacted alcohol is removed in the separation unit. As described above, as the injection of the reaction mixture into the N number of batch reactors may be sequentially performed, the discharge of the reaction products manufactured in each reactor may be also sequentially, or semi-continuously, performed.
- The separation unit used in the step S3 may include one or more separation columns. Depending on the number of stages of the separation column included in the separation unit in the manufacturing method of the present invention, the composition ratio of a composition to be finally manufactured may vary. Those skilled in the art may appropriately adjust the number of stages of the separation column included in the separation unit according to the composition ratio or properties of the composition to be manufactured. In addition, the separation unit may include a purification tank of a drum type in addition to the separation column. The separation unit may remove the amount of unreacted alcohol included in the reaction products to a level of 30% or less, preferably 20% or less, more preferably 10% or less of the total. Since the unreacted alcohol is removed as described above, the physical properties of an ester-based composition to be manufactured may be uniform and excellent.
- Typically, it is desirable that the separation column is operated continuously in terms of production management, and to this end, the reaction products discharged from each reactor may temporarily stay in a piece of equipment such as a tank before being injected into the separation column. The reaction products including the unreacted alcohol may stay in the equipment for about 0.1-10 hours, and the size of the equipment is not limited as long as the reaction products are stably and continuously supplied to the separation column.
- Catalyst Addition Step (S1-1 or S1-2)
- The manufacturing method of the present invention may further include a step S1-1 of adding a catalyst to the reaction mixture between the step S1 and the step S2, or a step S1-2 of adding a catalyst to a polycarboxylic acid and a first alcohol having 3 to 10 alkyl carbon atoms before the step S1.
- In the esterification reaction of the first alcohol and the carboxylic acid, a catalyst may be used, and when a catalyst is used, there is an advantage in that the reaction may be completed faster. The catalyst may be injected to a mixture of a polycarboxylic acid and a first alcohol, or to each of a polycarboxylic acid and a first alcohol before a mixture thereof is prepared. Particularly, it is preferable that the catalyst is added directly to the first alcohol in terms of the efficiency of the entire process.
- The catalyst used in the manufacturing method of the present invention may be one or more selected from an acid catalyst such as sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, paratoluenesulfonic acid, methanesulfonic acid, ethanesulfonic acid, propanesulfonic acid, butanesulfonic acid, and alkyl sulfuric acid, a metal salt such as aluminum lactate, lithium fluoride, potassium chloride, cesium chloride, calcium chloride, iron chloride, and phosphoric acid, a metal oxide such as heteropoly acid, a natural/synthetic zeolite, a cation and anion exchange resin, and an organic metal such as tetraalkyl titanate and a polymer thereof, and may preferably be tetraalkyl titanate. As the tetraalkyl titanate, TiPT, TnBT, TEHT, or the like may be used, and it is preferable to use tetraalkyl titanate having an alkyl group same as the alkyl group of the first alcohol having 3 to 10 alkyl carbon atoms as a ligand. When a catalyst having the same alkyl group as a ligand is used, it is preferable because catalyst by-products which may be generated in a subsequent process are controlled or not generated.
- The amount of a catalyst to be used may vary depending on the kind of the catalyst. In one example, a homogeneous catalyst may be used in an amount range of 0.001-5 wt %, 0.001-4 wt %, 0.01-3 wt %, or 0.01-2 wt % based on 100 wt % of the reaction mixture, and a heterogeneous catalyst may be used in an amount range of 5-200 wt %, 5-150 wt %, 10-150 wt %, or 20-150 wt % based on the total weight of the reaction mixture.
- Trans-Reaction Step (S4)
- The manufacturing method of the present invention may further include a step S4 of injecting a second alcohol having 3 to 10 alkyl carbon atoms into the reaction products from which the unreacted alcohol is removed to perform a trans-esterification reaction, wherein the second alcohol injected herein is different from the first alcohol injected in the step S1.
- Through the step S4, it is possible to manufacture a composition including two or more types of ester compounds. Those skilled in the art may select suitable alcohol according to the type of an ester compound to be included in the composition and perform a trans-esterification reaction. It is preferable that the step S4 is performed after the removal of unreacted alcohol. When the step S4 is performed before the removal of the unreacted alcohol, a trans-esterification reaction with newly injected second alcohol may not be easily performed due to the remaining unreacted alcohol, and even the reaction is performed to a certain degree, the alcohol content is too high to deteriorate the efficiency of the reaction. Therefore, it is preferable that the amount of the unreacted alcohol included in the reaction products before the trans-esterification reaction is 10% or less.
-
-
- 1: Mixer
- 11: Injection path of polycarboxylic acid
- 12: Injection path of first alcohol
- 13: Injection path of catalyst
- 2: Supply control unit
- 3: Reaction unit
- 31 to 3N: Each batch reactor (total of N reactors)
- 4: Separation unit
- 41: Movement path of ester-based composition from which unreacted alcohol is removed
- 42: Movement path of removed unreacted alcohol
- 5: Trans-reaction unit
- 51: Injection path of second alcohol different from first alcohol injected into 12
- 52: Movement path of ester-based composition which has been gone through trans-esterification reaction
- 92: Second recovery alcohol stream
- 93: Wastewater stream
Claims (7)
1-7. (canceled)
8. A method for manufacturing an ester-based composition, the method comprising:
a step S1 of injecting a polycarboxylic acid and a first alcohol having 3 to 10 alkyl carbon atoms into a mixer to form a reaction mixture;
a step S2 of sequentially injecting the reaction mixture into N number of batch reactors connected in parallel to perform a reaction such that the reaction is sequentially completed in the N number of batch reactors to semi-continuously manufacture reaction products; and
a step S3 of semi-continuously moving the reaction products into a separation unit to remove unreacted alcohol,
wherein N is an integer of 3 or greater.
9. The method of claim 8 , further comprising
a step S1-1 of adding a catalyst to the reaction mixture between the step S1 and the step S2; or
a step S1-2 of adding a catalyst to the polycarboxylic acid and the first alcohol having 3 to 10 alkyl carbon atoms before the step S1.
10. The method of claim 9 , wherein the catalyst is tetraalkyl titanate.
11. The method of claim 8 , wherein the step S1 further comprises a step in which the reaction mixture is heated to 50-200° C.
12. The method of claim 8 , wherein the temperature at which the reaction of the step S2 is performed is 130-250° C.
13. The method of claim 8 , further comprising a step S4 of injecting a second alcohol having 3 to 10 alkyl carbon atoms into the reaction products from which the unreacted alcohol is removed to perform a trans-esterification reaction, wherein the second alcohol injected in the step S4 is different from the first alcohol injected in the step S1.
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