CN102731302B - Method for preparing diester succinate by esterifying diammonium succinate - Google Patents
Method for preparing diester succinate by esterifying diammonium succinate Download PDFInfo
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- CN102731302B CN102731302B CN201210252023.2A CN201210252023A CN102731302B CN 102731302 B CN102731302 B CN 102731302B CN 201210252023 A CN201210252023 A CN 201210252023A CN 102731302 B CN102731302 B CN 102731302B
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- 238000000034 method Methods 0.000 title claims abstract description 33
- -1 diester succinate Chemical class 0.000 title claims abstract description 5
- NHJPVZLSLOHJDM-UHFFFAOYSA-N azane;butanedioic acid Chemical compound [NH4+].[NH4+].[O-]C(=O)CCC([O-])=O NHJPVZLSLOHJDM-UHFFFAOYSA-N 0.000 title abstract 3
- MUXOBHXGJLMRAB-UHFFFAOYSA-N Dimethyl succinate Chemical compound COC(=O)CCC(=O)OC MUXOBHXGJLMRAB-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 97
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical group OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 60
- 239000001384 succinic acid Substances 0.000 claims description 48
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 47
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 42
- KDYFGRWQOYBRFD-UHFFFAOYSA-L succinate(2-) Chemical compound [O-]C(=O)CCC([O-])=O KDYFGRWQOYBRFD-UHFFFAOYSA-L 0.000 claims description 36
- 238000006243 chemical reaction Methods 0.000 claims description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 16
- 230000035484 reaction time Effects 0.000 claims description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 230000032050 esterification Effects 0.000 claims description 9
- 238000005886 esterification reaction Methods 0.000 claims description 9
- 229910021529 ammonia Inorganic materials 0.000 claims description 8
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 6
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 6
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 6
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 4
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 claims description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 3
- 238000004821 distillation Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000006136 alcoholysis reaction Methods 0.000 claims description 2
- 238000007791 dehumidification Methods 0.000 claims description 2
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims description 2
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 239000000047 product Substances 0.000 abstract description 14
- 239000002994 raw material Substances 0.000 abstract description 9
- 239000003054 catalyst Substances 0.000 abstract description 5
- 239000011973 solid acid Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000007086 side reaction Methods 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 239000012043 crude product Substances 0.000 abstract 1
- 238000007670 refining Methods 0.000 abstract 1
- 238000001819 mass spectrum Methods 0.000 description 13
- 238000000655 nuclear magnetic resonance spectrum Methods 0.000 description 13
- 238000010992 reflux Methods 0.000 description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 7
- LDCRTTXIJACKKU-ARJAWSKDSA-N dimethyl maleate Chemical compound COC(=O)\C=C/C(=O)OC LDCRTTXIJACKKU-ARJAWSKDSA-N 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005984 hydrogenation reaction Methods 0.000 description 3
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-M Lactate Chemical compound CC(O)C([O-])=O JVTAAEKCZFNVCJ-UHFFFAOYSA-M 0.000 description 1
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 1
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000010242 baoji Substances 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 description 1
- 239000010977 jade Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002304 perfume Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000000066 reactive distillation Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 235000013599 spices Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Abstract
The invention discloses a method for preparing diester succinate by esterifying diammonium succinate, belonging to the field of chemical technology, and particularly discloses a method for preparing the diester succinate product with the purity of more than 99.8% by taking diammonium succinate as a raw material, contacting the raw material with an esterifying agent in a reactor filled with solid acid catalyst to generate dimethyl succinate crude product and finally refining. The method is simple, mild in technological conditions, reasonable in process flow, less in side reaction, high in product purity and good in quality.
Description
Technical field
The present invention relates to the method that succinate is prepared in the esterification of a kind of succinic acid two ammonium, particularly a kind of with succinic acid two ammonium and methyl alcohol for the method for dimethyl succinate prepared by raw material.
Background technology
Dimethyl succinate (has another name called Succinic acid dimethylester, CAS:106-65-0) be important synthetic perfume and foodstuff additive, also be the intermediate of organic synthesis and pharmaceutical synthesis, be widely used in the industries such as food, spices, daily-use chemical industry, medicine, coating, rubber, plastics.
Industrial, dimethyl succinate be with succinic acid and methyl alcohol for raw material, obtained by esterification under the katalysis of concentrated sulfuric acid catalyst.Adopt the vitriol oil many as the esterification side reaction of catalyzer, product yield is low, and the corrodibility of sulfuric acid is strong, and aftertreatment is complicated, seriously polluted, can not meet the requirement of environmental protection.
Disclosing a kind of in US Patent No. 5872276A is raw material with dimethyl maleate, continuous liquid phase hydrogenation prepares the method for dimethyl succinate, and the method adopts fixed-bed reactor, and reaction pressure is 30 MPas, temperature of reaction is 40-100 DEG C, and liquid hourly space velocity is 0.6-1.5g/ml Cat.h
-1.But the reaction pressure needed for the method hydrogenation is high, facility investment is large, and process cost is high.
Chinese patent CN101824627 discloses a kind of method being waste dimethyl succinate with cis-butenedioic anhydride and methyl alcohol, cis-butenedioic anhydride and methanol oxidation lactate synthesis dimethyl maleate under the katalysis of sulfuric acid or hydrochloric acid, then electrolytic reduction dimethyl maleate generates dimethyl succinate.With cis-butenedioic anhydride and methyl alcohol for raw material production dimethyl succinate is raw material production dimethyl succinate than with succinic acid, reaction more easily, more thorough.But the method uses sulfuric acid or hydrochloric acid in esterification process, equipment corrosion, the problem of catalyzer and product separation difficulty does not still solve.In addition, in dimethyl maleate electrolytic reduction synthesis of dimethyl succinate current efficiency and feed stock conversion not high, whole process energy consumption, supplies consumption are comparatively large, are unfavorable for large-scale production.
Disclose a kind of method producing dimethyl succinate with dimethyl maleate hydrogenation in Chinese patent CN101824627A, there is the features such as product purity is high, quality is good.But the method product separation long flow path, energy consumption are large, main raw material not easily obtains, and are unfavorable for large-scale industrial production.
Summary of the invention
The present invention adopts reactive distillation processes, utilizes succinic acid two aqueous ammonium and esterifying agent generation catalytic esterification to generate succinate, and in reaction process, removes the ammonia G&W produced in time.Invention increases the gamma value of succinic acid two ammonium, ensure that the yield of succinate has arrived 90-100%.Meanwhile, inhibit the generation of by product, in product, the content of nitrogen element is below 1%.
Specifically, the invention provides a kind of method being prepared succinate by the esterification of succinic acid two ammonium, it comprises the following steps:
(1) first by succinic acid two aqueous ammonium and esterifying agent with the mol ratio of 1:2.5 to 1:10 and stream joins in reactor, add catalyzer simultaneously, and pour nitrogen in reactor;
(2) at the temperature of 120 DEG C-230 DEG C, make succinic acid two ammonium in reactor carry out alcoholysis reaction, reaction carries out 8 ~ 14 hours;
(3) in reaction process, the gas-phase product on reactor top, through condenser and gas-liquid separator, is separated into ammonia, esterifying agent and water, and ammonia enters Ammonia recovery system, the water that esterifying agent and water are generated except dereaction by dehumidification system, dried esterifying agent returns in reactor;
(4) after reaction terminates, still bottom product leads to azeotropic rises in rectifying tower, and adds entrainer and distill, and the bottom product obtained is corresponding succinate;
Wherein, described in step (1), the mass concentration of succinic acid two aqueous ammonium is 40% to 90%, and esterifying agent is C1 ~ C6 alkyl alcohol of straight or branched, and catalyzer is solid acid catalyst, such as, and γ-Al
2o
3, H
3pO
4-diatomite, Al
2o
3/ MgO, SiO
2-Al
2o
3, ZSM-5 molecular sieve, SAPO-34 molecular sieve etc., the add-on of catalyzer is 8 ~ 10% of succinic acid two ammonium solution, and the pressure in reactor is 0.1 ~ 1.5Mpa, and entrainer is the one in chloroform, tetracol phenixin, benzene, toluene, acetonitrile, Virahol, pyridine, n-propyl alcohol, ethyl acetate.
In above-mentioned steps (1), the mass concentration of described succinic acid two aqueous ammonium is preferably 40 ~ 80%, is more preferably 60%.
In above-mentioned steps (1), described esterifying agent is preferably methyl alcohol, ethanol, n-propyl alcohol, Virahol, propyl carbinol, isopropylcarbinol or the trimethyl carbinol, is more preferably methyl alcohol.
In above-mentioned steps (1), the mol ratio of described succinic acid two aqueous ammonium and esterifying agent is preferably 1:5 to 1:10, is more preferably 1:10.
In above-mentioned steps (1), described catalyzer is preferably SiO
2-Al
2o
3.
In above-mentioned steps (2), temperature of reaction is preferably 170 DEG C ~ 190 DEG C, is more preferably 170 DEG C.
In above-mentioned steps (2), the reaction times is preferably 10 ~ 14 hours, is more preferably 10 hours.
In above-mentioned steps (4), the pressure of described rectifying is 0.2-1.0MPa, tower top temperature 64-72 DEG C, column bottom temperature 85-120 DEG C, and distillation time is 1.5-3h.
Method of the present invention tool compared with preparing the method for succinate in prior art has the following advantages:
(1) adopt solid acid catalyst, simplify separation process, whole reaction process is simple, little to the corrosion of equipment, energy consumption is low, pollution-free.
(2) in esterification workshop section, adopt reaction distillation technique, shift out the ammonia G&W that reaction produces, improve the transformation efficiency of succinic acid two ammonium, the transformation efficiency of succinic acid two ammonium reaches more than 80%, and the selectivity of dimethyl succinate is greater than 99%.
(3) at product purification rectification section, product separation is simple, and good product quality, purity is high.
Accompanying drawing explanation
Fig. 1 is the mass spectrum of obtained succinate.
Fig. 2 is the nuclear magnetic resonance spectrum of obtained succinate.
Embodiment
Below by embodiment, the present invention will be further described, but scope of the present invention is not only limited to the scope that embodiment covers.Succinic acid two ammonium described in the application is purchased from Baoji precious jade Chemical Co., Ltd..
Embodiment 1
Be added in 11.4 water by 7.6g succinic acid two ammonium, obtaining 19g succinic acid two ammonium mass concentration is the solution of 40%, by this solution and 20ml methyl alcohol and stream joins in reactor, adds catalyzer (SiO simultaneously
2-Al
2o
3) 0.6g, in reactor, pass into nitrogen, make reacting kettle inner pressure be promoted to 0.2Mpa.Temperature of reaction is 120 DEG C, and the reaction times is 10h.
The stage number of succinate azeotropy rectification column is 15 pieces, adds 16g ethyl acetate as entrainer, and reflux ratio is 1, and tower top temperature is 62-65 DEG C, and column bottom temperature is 90-100 DEG C.As shown in Figure 1, nuclear magnetic resonance spectrum as shown in Figure 2 for the mass spectrum of obtained succinate.
Experimental result sees below table 1.
Embodiment 2
Be added in 7.6 water by 7.6g succinic acid two ammonium, obtaining 15.2g succinic acid two ammonium mass concentration is the solution of 50%, by this solution and 20ml methyl alcohol and stream joins in reactor, adds catalyzer (SiO simultaneously
2-Al
2o
3) 0.6g, in reactor, pass into nitrogen, make reacting kettle inner pressure be promoted to 0.2Mpa.Temperature of reaction is 150 DEG C, and the reaction times is 10h.
The stage number of succinate azeotropy rectification column is 15 pieces, adds 16g ethyl acetate as entrainer, and reflux ratio is 1, and tower top temperature is 60-65 DEG C, and column bottom temperature is 90-100 DEG C.As shown in Figure 1, nuclear magnetic resonance spectrum as shown in Figure 2 for the mass spectrum of obtained succinate.
Experimental result sees below table 1.
Embodiment 3
Be added in 5.07 water by 7.6g succinic acid two ammonium, obtaining 12.67g succinic acid two ammonium mass concentration is the solution of 60%, by this solution and 20ml methyl alcohol and stream joins in reactor, adds catalyzer (SiO simultaneously
2-Al
2o
3) 0.6g, in reactor, pass into nitrogen, make reacting kettle inner pressure be promoted to 0.2Mpa.Temperature of reaction is 150 DEG C, and the reaction times is 10h.
The stage number of succinate azeotropy rectification column is 15 pieces, adds 16g ethyl acetate as entrainer, and reflux ratio is 1, and tower top temperature is 60-65 DEG C, and column bottom temperature is 90-100 DEG C.As shown in Figure 1, nuclear magnetic resonance spectrum as shown in Figure 2 for the mass spectrum of obtained succinate.
Experimental result sees below table 1.
Embodiment 4
Be added in 3.26 water by 7.6g succinic acid two ammonium, configuration 10.86g succinic acid two ammonium mass concentration is the solution of 70%, by this solution and 20ml methyl alcohol and stream joins in reactor, adds catalyzer (SiO simultaneously
2-Al
2o
3) 0.6g, in reactor, pass into nitrogen, make reacting kettle inner pressure be promoted to 0.2Mpa.Temperature of reaction is 150 DEG C, and the reaction times is 10h.
The stage number of succinate azeotropy rectification column is 15 pieces, adds 16g ethyl acetate as entrainer, and reflux ratio is 1, and tower top temperature is 60-65 DEG C, and column bottom temperature is 90-100 DEG C.As shown in Figure 1, nuclear magnetic resonance spectrum as shown in Figure 2 for the mass spectrum of obtained succinate.
Experimental result sees below table 1.
The result of table 1 embodiment 1-embodiment 4
Embodiment 5
Be added in 3.26 water by 7.6g succinic acid two ammonium, obtaining 10.86g succinic acid two ammonium mass concentration is the solution of 70%, adds catalyzer (SiO simultaneously
2-Al
2o
3) 0.6g, by this solution and 20ml methyl alcohol and stream joins in reactor, in reactor, pass into nitrogen, make reacting kettle inner pressure be promoted to 0.2Mpa.Temperature of reaction is 120 DEG C, and the reaction times is 10h.
The stage number of succinate azeotropy rectification column is 15 pieces, adds 16g ethyl acetate as entrainer, and reflux ratio is 1, and tower top temperature is 60-65 DEG C, and column bottom temperature is 90-100 DEG C.As shown in Figure 1, nuclear magnetic resonance spectrum as shown in Figure 2 for the mass spectrum of obtained succinate.
Experimental result sees below table 2.
Embodiment 6
Be added in 3.26g water by 7.6g succinic acid two ammonium, obtaining 10.86g succinic acid two ammonium mass concentration is the solution of 70%, by this solution and 20ml methyl alcohol and stream joins in reactor, adds catalyzer (SiO simultaneously
2-Al
2o
3) 0.6g, in reactor, pass into nitrogen, make reacting kettle inner pressure be promoted to 0.2Mpa.Temperature of reaction is 150 DEG C, and the reaction times is 10h.
The stage number of succinate azeotropy rectification column is 15 pieces, adds 16g ethyl acetate as entrainer, and reflux ratio is 1, and tower top temperature is 60-65 DEG C, and column bottom temperature is 90-100 DEG C.As shown in Figure 1, nuclear magnetic resonance spectrum as shown in Figure 2 for the mass spectrum of obtained succinate.
Experimental result sees below table 2.
Embodiment 7
Be added in 3.26g water by 7.6g succinic acid two ammonium, obtaining 10.86g succinic acid two ammonium mass concentration is the solution of 70%, by this solution and 20ml methyl alcohol and stream joins in reactor, adds catalyzer (SiO simultaneously
2-Al
2o
3) 0.6g, in reactor, pass into nitrogen, make reacting kettle inner pressure be promoted to 0.2Mpa.Temperature of reaction is 170 DEG C, and the reaction times is 10h.
The stage number of succinate azeotropy rectification column is 15 pieces, adds 16g ethyl acetate as entrainer, and reflux ratio is 1, and tower top temperature is 60-65 DEG C, and column bottom temperature is 90-100 DEG C.As shown in Figure 1, nuclear magnetic resonance spectrum as shown in Figure 2 for the mass spectrum of obtained succinate.
Experimental result sees below table 2.
Embodiment 8
Be added in 3.26g water by 7.6g succinic acid two ammonium, obtaining 10.86g succinic acid two ammonium mass concentration is the solution of 70%, by this solution and 20ml methyl alcohol and stream joins in reactor, adds catalyst A l simultaneously
2o
3/ MgO 0.6g, passes into nitrogen in reactor, makes reacting kettle inner pressure be promoted to 0.2Mpa.Temperature of reaction is 190 DEG C, and the reaction times is 10h.
The stage number of succinate azeotropy rectification column is 15 pieces, adds 16g ethyl acetate as entrainer, and reflux ratio is 1, and tower top temperature is 60-65 DEG C, and column bottom temperature is 90-100 DEG C.As shown in Figure 1, nuclear magnetic resonance spectrum as shown in Figure 2 for the mass spectrum of obtained succinate.
Experimental result sees below table 2.
The result of table 2 embodiment 5-embodiment 8
Embodiment 9
Be added in 3.26g water by 7.6g succinic acid two ammonium, obtaining 10.86g succinic acid two ammonium mass concentration is the solution of 70%, by this solution and 20ml methyl alcohol and stream joins in reactor, adds catalyzer (SiO simultaneously
2-Al
2o
3) 0.6g, in reactor, pass into nitrogen, make reacting kettle inner pressure be promoted to 0.2Mpa.Temperature of reaction is 170 DEG C, and the reaction times is 8h.
The stage number of succinate azeotropy rectification column is 15 pieces, adds 16g ethyl acetate as entrainer, and reflux ratio is 1, and tower top temperature is 60-65 DEG C, and column bottom temperature is 90-100 DEG C.As shown in Figure 1, nuclear magnetic resonance spectrum as shown in Figure 2 for the mass spectrum of obtained succinate.
Experimental result sees below table 3.
Embodiment 10
Be added in 3.26g water by 7.6g succinic acid two ammonium, obtaining 10.86g succinic acid two ammonium mass concentration is the solution of 70%, by this solution and 20ml methyl alcohol and stream joins in reactor, adds catalyzer (SiO simultaneously
2-Al
2o
3) 0.6g, in reactor, pass into nitrogen, make reacting kettle inner pressure be promoted to 0.2Mpa.Temperature of reaction is 170 DEG C, and the reaction times is 10h.
The stage number of succinate azeotropy rectification column is 15 pieces, adds 16g ethyl acetate as entrainer, and reflux ratio is 1, and tower top temperature is 60-65 DEG C, and column bottom temperature is 90-100 DEG C.As shown in Figure 1, nuclear magnetic resonance spectrum as shown in Figure 2 for the mass spectrum of obtained succinate.
Experimental result sees below table 3.
Embodiment 11
Be added in 3.26 water by 7.6g succinic acid two ammonium, obtaining 10.86g succinic acid two ammonium mass concentration is the solution of 70%, by this solution and 20ml methyl alcohol and stream joins in reactor, adds catalyzer (SiO simultaneously
2-Al
2o
3) 0.6g, in reactor, pass into nitrogen, make reacting kettle inner pressure be promoted to 0.2Mpa.Temperature of reaction is 170 DEG C, and the reaction times is 12h.
The stage number of succinate azeotropy rectification column is 15 pieces, adds 16g ethyl acetate as entrainer, and reflux ratio is 1, and tower top temperature is 60-65 DEG C, and column bottom temperature is 90-100 DEG C.As shown in Figure 1, nuclear magnetic resonance spectrum as shown in Figure 2 for the mass spectrum of obtained succinate.
Experimental result sees below table 3.
Embodiment 12
Be added in 3.26 water by 7.6g succinic acid two ammonium, obtaining 10.86g succinic acid two ammonium mass concentration is the solution of 70%, by this solution and 20ml methyl alcohol and stream joins in reactor, adds catalyzer (SiO simultaneously
2-Al
2o
3) 0.6g, in reactor, pass into nitrogen, make reacting kettle inner pressure be promoted to 0.2Mpa.Temperature of reaction is 170 DEG C, and the reaction times is 14h.
The stage number of succinate azeotropy rectification column is 15 pieces, adds 16g ethyl acetate as entrainer, and reflux ratio is 1, and tower top temperature is 60-65 DEG C, and column bottom temperature is 90-100 DEG C.As shown in Figure 1, nuclear magnetic resonance spectrum as shown in Figure 2 for the mass spectrum of obtained succinate.
Experimental result sees below table 3.
The result of table 3 embodiment 9-embodiment 12
As can be seen from the above results, when succinic acid two aqueous ammonium concentration is 70%, temperature of reaction is 170 DEG C, and the reaction times is 10 constantly little, and the by product that method as herein described obtains is few, and the cost of raw material is low, and product purity is high.
Claims (9)
1. prepared a method for succinate by the esterification of succinic acid two ammonium, it comprises the following steps:
(1) first by succinic acid two aqueous ammonium and esterifying agent with the mol ratio of 1:2.5 to 1:10 and stream joins in reactor, add catalyzer simultaneously, and pour nitrogen in reactor;
(2) at the temperature of 120 DEG C-230 DEG C, make succinic acid two ammonium in reactor carry out alcoholysis reaction, reaction carries out 8 ~ 14 hours;
(3) in reaction process, the gas-phase product on reactor top, through condenser and gas-liquid separator, is separated into ammonia, esterifying agent and water, and ammonia enters Ammonia recovery system, the water that esterifying agent and water are generated except dereaction by dehumidification system, dried esterifying agent returns in reactor;
(4) after reaction terminates, still bottom product leads to azeotropic rises in rectifying tower, and adds entrainer and distill, and the bottom product obtained is corresponding succinate;
Wherein, described in step (1), the mass concentration of succinic acid two aqueous ammonium is 40% to 90%, and esterifying agent is C1 ~ C6 alkyl alcohol of straight or branched, and catalyzer is SiO
2-Al
2o
3, the add-on of catalyzer is 8 ~ 10% of succinic acid two ammonium solution, and the pressure in reactor is 0.1 ~ 1.5Mpa, and entrainer is the one in chloroform, tetracol phenixin, benzene, toluene, acetonitrile, Virahol, pyridine, n-propyl alcohol, ethyl acetate.
2. method according to claim 1, wherein, described esterifying agent is methyl alcohol, and described succinate is dimethyl succinate.
3. method according to claim 1, the mass concentration of wherein said succinic acid two aqueous ammonium is 40 ~ 80%.
4. method according to claim 1, wherein, the temperature of reaction of described step (2) is 170 DEG C ~ 190 DEG C.
5. method according to claim 1, wherein, the reaction times of described step (2) is 10 ~ 14 hours.
6. method according to claim 1, the mass concentration of wherein said succinic acid two aqueous ammonium is 70%.
7. method according to claim 1, wherein, the temperature of reaction of described step (2) is 170 DEG C.
8. method according to claim 1, wherein, the reaction times of described step (2) is 10 hours.
9. method according to claim 1, wherein, the pressure of described step (4) rectifying is 0.2-1.0MPa, tower top temperature 64-72 DEG C, column bottom temperature 85-120 DEG C, and distillation time is 1.5-3h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210252023.2A CN102731302B (en) | 2012-07-19 | 2012-07-19 | Method for preparing diester succinate by esterifying diammonium succinate |
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| CN1337940A (en) * | 1999-02-03 | 2002-02-27 | 三星精密化学株式会社 | A process for preparing (R)-4-cyano-3-hydroxybutyric acid ester |
| CN101323566A (en) * | 2007-06-11 | 2008-12-17 | 深圳市飞扬实业有限公司 | Preparation method of diethyl succinate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1337940A (en) * | 1999-02-03 | 2002-02-27 | 三星精密化学株式会社 | A process for preparing (R)-4-cyano-3-hydroxybutyric acid ester |
| CN101323566A (en) * | 2007-06-11 | 2008-12-17 | 深圳市飞扬实业有限公司 | Preparation method of diethyl succinate |
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