WO2022154223A1 - 폴리에스테르의 탈색 방법 및 이를 포함하는 폴리에스테르의 해중합 방법 - Google Patents
폴리에스테르의 탈색 방법 및 이를 포함하는 폴리에스테르의 해중합 방법 Download PDFInfo
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- WO2022154223A1 WO2022154223A1 PCT/KR2021/015812 KR2021015812W WO2022154223A1 WO 2022154223 A1 WO2022154223 A1 WO 2022154223A1 KR 2021015812 W KR2021015812 W KR 2021015812W WO 2022154223 A1 WO2022154223 A1 WO 2022154223A1
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- WIPO (PCT)
- Prior art keywords
- polyester
- acid
- glycol
- dibasic acid
- depolymerization
- Prior art date
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- 229920000728 polyester Polymers 0.000 title claims abstract description 150
- 238000000034 method Methods 0.000 title claims abstract description 88
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 107
- -1 polypropylene Polymers 0.000 claims description 83
- 239000002253 acid Substances 0.000 claims description 72
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 54
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 36
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 34
- 239000000203 mixture Substances 0.000 claims description 29
- 150000003839 salts Chemical class 0.000 claims description 29
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000004042 decolorization Methods 0.000 claims description 18
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 15
- 238000006116 polymerization reaction Methods 0.000 claims description 15
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 14
- 239000013078 crystal Substances 0.000 claims description 14
- DNIAPMSPPWPWGF-UHFFFAOYSA-N propylene glycol Substances CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 14
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- 150000005846 sugar alcohols Polymers 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 10
- 239000003513 alkali Substances 0.000 claims description 10
- 239000007844 bleaching agent Substances 0.000 claims description 10
- PUPZLCDOIYMWBV-UHFFFAOYSA-N (+/-)-1,3-Butanediol Chemical compound CC(O)CCO PUPZLCDOIYMWBV-UHFFFAOYSA-N 0.000 claims description 9
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 9
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 8
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 6
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 claims description 6
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 5
- 239000002202 Polyethylene glycol Substances 0.000 claims description 5
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 5
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 claims description 5
- 229920001223 polyethylene glycol Polymers 0.000 claims description 5
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 4
- SZXQTJUDPRGNJN-UHFFFAOYSA-N dipropylene glycol Chemical compound OCCCOCCCO SZXQTJUDPRGNJN-UHFFFAOYSA-N 0.000 claims description 4
- 235000011187 glycerol Nutrition 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 claims description 3
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 3
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 claims description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 2
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 claims description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 claims description 2
- 229910002651 NO3 Inorganic materials 0.000 claims description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 2
- 230000003472 neutralizing effect Effects 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 239000003086 colorant Substances 0.000 abstract description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 38
- 239000005020 polyethylene terephthalate Substances 0.000 description 38
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 24
- 239000002904 solvent Substances 0.000 description 24
- 239000002699 waste material Substances 0.000 description 22
- 238000006243 chemical reaction Methods 0.000 description 21
- WOZVHXUHUFLZGK-UHFFFAOYSA-N dimethyl terephthalate Chemical compound COC(=O)C1=CC=C(C(=O)OC)C=C1 WOZVHXUHUFLZGK-UHFFFAOYSA-N 0.000 description 20
- 239000000975 dye Substances 0.000 description 15
- 239000003054 catalyst Substances 0.000 description 14
- 239000000047 product Substances 0.000 description 13
- 239000000835 fiber Substances 0.000 description 12
- 239000000178 monomer Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 239000007810 chemical reaction solvent Substances 0.000 description 9
- 238000012691 depolymerization reaction Methods 0.000 description 9
- 238000002845 discoloration Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 239000004744 fabric Substances 0.000 description 8
- 230000034659 glycolysis Effects 0.000 description 8
- 238000005809 transesterification reaction Methods 0.000 description 8
- QPKOBORKPHRBPS-UHFFFAOYSA-N bis(2-hydroxyethyl) terephthalate Chemical compound OCCOC(=O)C1=CC=C(C(=O)OCCO)C=C1 QPKOBORKPHRBPS-UHFFFAOYSA-N 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- WVDDGKGOMKODPV-UHFFFAOYSA-N Benzyl alcohol Chemical compound OCC1=CC=CC=C1 WVDDGKGOMKODPV-UHFFFAOYSA-N 0.000 description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 6
- 229910052783 alkali metal Inorganic materials 0.000 description 6
- 150000001340 alkali metals Chemical class 0.000 description 6
- 238000004061 bleaching Methods 0.000 description 6
- 239000007809 chemical reaction catalyst Substances 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 238000004821 distillation Methods 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 238000006136 alcoholysis reaction Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 230000007062 hydrolysis Effects 0.000 description 5
- 238000006460 hydrolysis reaction Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000006068 polycondensation reaction Methods 0.000 description 4
- 229920001225 polyester resin Polymers 0.000 description 4
- 239000004645 polyester resin Substances 0.000 description 4
- 239000003381 stabilizer 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
- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 3
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- 238000000354 decomposition reaction Methods 0.000 description 3
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- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 150000007522 mineralic acids Chemical class 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 235000021317 phosphate Nutrition 0.000 description 3
- 229920001707 polybutylene terephthalate Polymers 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 description 3
- 235000017550 sodium carbonate Nutrition 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004753 textile Substances 0.000 description 3
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 3
- YIWUKEYIRIRTPP-UHFFFAOYSA-N 2-ethylhexan-1-ol Chemical compound CCCCC(CC)CO YIWUKEYIRIRTPP-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000001342 alkaline earth metals Chemical class 0.000 description 2
- 239000000908 ammonium hydroxide Substances 0.000 description 2
- 235000019445 benzyl alcohol Nutrition 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
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- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- KZTYYGOKRVBIMI-UHFFFAOYSA-N diphenyl sulfone Chemical compound C=1C=CC=CC=1S(=O)(=O)C1=CC=CC=C1 KZTYYGOKRVBIMI-UHFFFAOYSA-N 0.000 description 2
- VIQSRHWJEKERKR-UHFFFAOYSA-L disodium;terephthalate Chemical compound [Na+].[Na+].[O-]C(=O)C1=CC=C(C([O-])=O)C=C1 VIQSRHWJEKERKR-UHFFFAOYSA-L 0.000 description 2
- 230000032050 esterification Effects 0.000 description 2
- 238000005886 esterification reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 238000005470 impregnation Methods 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
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical class OP(O)O OJMIONKXNSYLSR-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
- WLJVNTCWHIRURA-UHFFFAOYSA-N pimelic acid Chemical compound OC(=O)CCCCCC(O)=O WLJVNTCWHIRURA-UHFFFAOYSA-N 0.000 description 2
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 2
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- 229920000573 polyethylene Polymers 0.000 description 2
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- 229910052700 potassium Inorganic materials 0.000 description 2
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- 229960003975 potassium Drugs 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- CYIDZMCFTVVTJO-UHFFFAOYSA-N pyromellitic acid Chemical compound OC(=O)C1=CC(C(O)=O)=C(C(O)=O)C=C1C(O)=O CYIDZMCFTVVTJO-UHFFFAOYSA-N 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000003252 repetitive effect Effects 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- TYFQFVWCELRYAO-UHFFFAOYSA-N suberic acid Chemical compound OC(=O)CCCCCCC(O)=O TYFQFVWCELRYAO-UHFFFAOYSA-N 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- ARCGXLSVLAOJQL-UHFFFAOYSA-N trimellitic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C(C(O)=O)=C1 ARCGXLSVLAOJQL-UHFFFAOYSA-N 0.000 description 2
- HVLLSGMXQDNUAL-UHFFFAOYSA-N triphenyl phosphite Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)OC1=CC=CC=C1 HVLLSGMXQDNUAL-UHFFFAOYSA-N 0.000 description 2
- 229910000404 tripotassium phosphate Inorganic materials 0.000 description 2
- 235000019798 tripotassium phosphate Nutrition 0.000 description 2
- ARWQHTZTOWMAEQ-UHFFFAOYSA-N (2-carboxyoxyphenyl) hydrogen carbonate Chemical compound OC(=O)OC1=CC=CC=C1OC(O)=O ARWQHTZTOWMAEQ-UHFFFAOYSA-N 0.000 description 1
- PXGZQGDTEZPERC-UHFFFAOYSA-N 1,4-cyclohexanedicarboxylic acid Chemical compound OC(=O)C1CCC(C(O)=O)CC1 PXGZQGDTEZPERC-UHFFFAOYSA-N 0.000 description 1
- ALVZNPYWJMLXKV-UHFFFAOYSA-N 1,9-Nonanediol Chemical compound OCCCCCCCCCO ALVZNPYWJMLXKV-UHFFFAOYSA-N 0.000 description 1
- PWKNBLFSJAVFAB-UHFFFAOYSA-N 1-fluoro-2-nitrobenzene Chemical compound [O-][N+](=O)C1=CC=CC=C1F PWKNBLFSJAVFAB-UHFFFAOYSA-N 0.000 description 1
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 description 1
- SBASXUCJHJRPEV-UHFFFAOYSA-N 2-(2-methoxyethoxy)ethanol Chemical compound COCCOCCO SBASXUCJHJRPEV-UHFFFAOYSA-N 0.000 description 1
- SXFJDZNJHVPHPH-UHFFFAOYSA-N 3-methylpentane-1,5-diol Chemical compound OCCC(C)CCO SXFJDZNJHVPHPH-UHFFFAOYSA-N 0.000 description 1
- UDCSURCKPULYEL-UHFFFAOYSA-N 4,6-dibromobenzene-1,3-dicarboxylic acid Chemical compound OC(=O)C1=CC(C(O)=O)=C(Br)C=C1Br UDCSURCKPULYEL-UHFFFAOYSA-N 0.000 description 1
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- WVDRSXGPQWNUBN-UHFFFAOYSA-N 4-(4-carboxyphenoxy)benzoic acid Chemical compound C1=CC(C(=O)O)=CC=C1OC1=CC=C(C(O)=O)C=C1 WVDRSXGPQWNUBN-UHFFFAOYSA-N 0.000 description 1
- NEQFBGHQPUXOFH-UHFFFAOYSA-N 4-(4-carboxyphenyl)benzoic acid Chemical compound C1=CC(C(=O)O)=CC=C1C1=CC=C(C(O)=O)C=C1 NEQFBGHQPUXOFH-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
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- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 150000001242 acetic acid derivatives Chemical class 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
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Images
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Definitions
- the present invention relates to a decolorization method of polyester, particularly colored polyester to which a large amount of dye has been added during processing, and a depolymerization method comprising the same.
- Polyester represented by polyethylene terephthalate (PET) has excellent chemical stability and is used in textiles, fabrics, clothes, films, sheets, beverage bottles, and the like.
- This chemical recycling is expected as a means to realize the reuse of resources because impurities can be separated and the quality as a raw material is not significantly different from that of virgin.
- the three major methods for depolymerization of polyester to monomers are the hydrolysis method using water as the solvent, the alcoholysis method using alcohol as the solvent, and the glycolysis method using glycol as the solvent.
- the hydrolysis method includes, for example, a method in which a polyethylene terephthalate melt is reacted with water and then reacted with ammonium hydroxide to decompose into terephthalic acid and ethylene glycol (see Patent Document 1).
- This method has the advantage of not using glycol or alcohol for the reaction, but requires a special high-pressure reactor because the reaction takes place under high-pressure conditions.
- the alcoholysis method is a method of depolymerizing polyester, for example, by heating in an alcohol solvent (adding a catalyst if necessary) (see Patent Document 2 and Patent Document 3).
- an alcohol solvent for example, when polyethylene terephthalate is depolymerized using methanol as a solvent, dimethyl terephthalate (DMT), a useful and easy-to-handle monomer, is directly produced by the depolymerization reaction, and the depolymerization reaction is also relatively fast.
- DMT dimethyl terephthalate
- alcohol used as a solvent has a low boiling point and requires pressurization to proceed with the reaction (for example, it is reacted in methanol in a supercritical or subcritical state), and a special high-pressure reactor is required.
- the glycolysis method is a method of depolymerizing polyester by heating it together with a depolymerization catalyst such as sodium carbonate in an excess alkylene glycol solvent to produce bis( ⁇ -hydroxyalkyl) terephthalate and ethylene glycol (Patent Document 4, and See Patent Document 5).
- a depolymerization catalyst such as sodium carbonate
- ethylene glycol is used as a solvent
- bis( ⁇ -hydroxyethyl) terephthalate (BHET) is produced by depolymerization, and methanol is added in the presence of a transesterification catalyst to carry out a transesterification reaction.
- Terephthalate (DMT) can be recovered.
- the glycolysis method can be reacted under normal pressure, but the reaction time is relatively long, so the reaction time is required to be shortened, and there is a problem in that the glycol in the solvent is heated for a long time and deteriorates.
- polyester raw materials are not transparent like beverage bottles.
- the color removal of the dye injected during processing is the final step. It greatly affects the quality of the product.
- the amount of dye input also rapidly increases according to the color and fineness of the fibers. Accordingly, the use of colored polyester feedstock is limited, and in order to create added value, it is the most rational and eco-friendly method to decompose it into a raw material through depolymerization and then repolymerize it, but it is not economical due to the high process cost.
- the dyes of these colored polyesters are removed through solvent treatment and adsorption process (activated carbon) for decolorization during the depolymerization process. This is rapidly reduced, and the overall process cost is high, which is practically not economical. For this reason, it is common to use polyester bottle flakes with high recovery purity for polyester depolymerization.
- Patent Document 1 Japanese Patent Laid-Open No. 2003-527363 (published date: September 16, 2003)
- Patent Document 2 Japanese Patent Laid-Open No. 1999-100336 (published on: April 13, 1999)
- Patent Document 3 Japanese Patent Application Laid-Open No. 2003-300916 (published date: October 21, 2003)
- Patent Document 4 Japanese Patent Laid-Open No. 2002-167468 (published on: June 11, 2002)
- Patent Document 5 Japanese Patent Laid-Open No. 2004-300115 (published on October 28, 2004)
- a method for decolorizing polyester capable of removing dyes of colored polyester at low cost and with high efficiency.
- a method of depolymerizing polyester comprising the step of decolorizing the polyester.
- composition for polymerization of recycled polyester prepared by a method of depolymerization of polyester.
- a recycled polyester prepared using a composition for polymerization of recycled polyester.
- the step of contacting the polyester with superheated steam It provides a method for decolorizing polyester.
- the temperature of the superheated steam may be 250 °C to 450 °C.
- Superheated steam may be applied at an injection pressure of 0.1 bar to 2 bar.
- the decolorization step may be performed for 1 minute to 60 minutes.
- the alkali may include sodium hydroxide, potassium hydroxide, lithium hydroxide, ammonia, or mixtures thereof.
- the acid may include hydrochloric acid, nitric acid, sulfuric acid, carbonic acid, phosphoric acid, acetic acid, hypochlorous acid (HClO), or mixtures thereof.
- Salts may include carbonates, hydrogencarbonates, phosphates, sulfates, sulfites, nitrates, silicates, hypochlorites, formates, acetates, citrates, oxalates, or mixtures thereof.
- the mono alcohol may include methanol, ethanol, propanol, butanol, or mixtures thereof.
- Polyhydric alcohols include ethylene glycol, n-propylene glycol, isopropylene glycol, diethylene glycol, polyethylene glycol, triethylene glycol, dipropylene glycol, 1,3-butanediol, 1,4-butanediol, glycerin, benzyl alcohol, polypropylene glycol , pentaerythritol, trimethylolpropane, or mixtures thereof.
- the bleaching agent may be added in an amount of 0.05 to 1.5 moles based on 1.0 mole of the dibasic acid contained in the polyester.
- the polyester is brought into contact with superheated steam to form the polyester.
- Decolorizing, depolymerizing the decolorized polyester to obtain a depolymerization product containing alkylene glycol and dibasic acid salt, solid-liquid separation of the liquid alkylene glycol and the solid dibasic acid salt from the depolymerization product There is provided a method for depolymerization of polyester, comprising the steps of dissolving a dibasic acid salt in water, neutralizing an aqueous solution of the dibasic acid salt with an acid to precipitate dibasic acid crystals, and solid-liquid separating the dibasic acid crystals from the precipitated product. .
- the method of depolymerizing the polyester may further include removing impurities from the aqueous solution of the dibasic acid salt.
- the method for depolymerizing polyester may further include recrystallizing dibasic acid crystals.
- composition for polymerization of recycled polyester comprising a dibasic acid and an alkylene glycol, obtained by the method of depolymerizing polyester according to an embodiment.
- the color of the recycled polyester may have an L value of 60 or more.
- the method for decolorizing polyester according to an embodiment can remove dyes of colored polyester with low cost and high efficiency.
- Example 3 is a photograph showing before and after bleaching treatment of polyethylene terephthalate in Example 3.
- the method for decolorizing polyester includes adding a decolorizing agent to the polyester, and then contacting the polyester with superheated steam.
- the polyester may be a polyester formed by polymerization of a dibasic acid and an alkylene glycol, for example, polyethylene terephthalate (PET), polybutylene terephthalate, or polyethylene naphthalate, or polycaprolactone formed by polymerization of caprolactone.
- PET polyethylene terephthalate
- PBT polybutylene terephthalate
- polyethylene naphthalate polyethylene naphthalate
- polycaprolactone formed by polymerization of caprolactone.
- a molded article containing polyester in particular, a waste product may be used. Wastes may be residues, defective products, etc. generated during the manufacture of molded products in addition to wastes generated after using a molded article containing polyester. For example, it may be a used PET bottle, cup, string, packaging pack, etc., or a burr or sprue when molding these, a sheet after cutting the cup after vacuum forming, fiber, fabric, clothing, film, sheet, or the like.
- the method for decolorizing polyester according to an embodiment can economically and efficiently decolorize colored polyester such as fibers, fabrics, and clothes containing a large amount of dye, as will be described later.
- the content of polyester in the polyester waste may be 60% to 100% by weight based on the total weight of the polyester waste. If the content of the polyester is less than 60% by weight, the amount of side-reactants and non-recyclable separation and purification wastes compared to the raw materials obtained through the depolymerization process is too large, so it may not be practically economical.
- the polyester is directly contacted with superheated steam to decolorize by dry method.
- the decolorization efficiency is high because superheated steam directly reacts with the polyester, and it is economical by using relatively inexpensive superheated steam.
- the depolymerization efficiency can also be improved when the polyester is depolymerized after decolorization.
- the decolorization reaction is performed by directly adding superheated steam to the polyester, a high-pressure reactor is not required, and the apparatus can be configured as a batch or continuous reactor.
- the contact between the polyester and the superheated steam may be achieved by directly spraying the superheated steam of 250 ° C to 450 ° C to the polyester at a spray pressure of 0.1 bar to 2 bar, for example, the temperature of the superheated steam is It may be 280 °C to 380 °C.
- the decolorization time of the polyester may be too long, resulting in lower economic feasibility.
- the pressure of the superheated steam is less than 0.1 bar, the actual decolorization time may not have much effect compared to the general wet reaction due to the lack of contact effectiveness of the direct reaction steam. Because of the relationship, melting is preceded rather than decomposition to form a large mass, so the time for discoloration from the surface to the inner surface may be prolonged.
- the decolorization reaction may be performed for 1 minute to 60 minutes, or 10 minutes to 40 minutes.
- the decolorization reaction time can be increased within 60 minutes as the concentration of impurities including dyes of the polyester increases, the amount of processing of the polyester increases, and the temperature of the superheated steam decreases.
- a decolorizing agent may be added to the polyester prior to contacting the polyester with superheated steam.
- the thermoplastic resin polyester When treated with high-temperature, superheated steam alone, the thermoplastic resin polyester is dissolved before the dye is decomposed and discolored only on the surface, and it may not discolor inside the dissolved polyester. It can be allowed to decolorize before it dissolves.
- the bleaching agent may include an alkali, an acid, a salt thereof, a mono alcohol, a polyhydric alcohol, or a mixture thereof.
- the alkali may include a hydroxide of an alkali metal or alkaline earth metal, ammonia, or a mixture thereof.
- the alkali metal may be a monovalent metal such as lithium, sodium, potassium, rubidium, or cesium, among which sodium or potassium, which is relatively inexpensive, may be used.
- the alkaline earth metal may be beryllium, magnesium, calcium, strontium, barium, radium, or the like.
- the hydroxide of an alkali metal include sodium hydroxide, potassium hydroxide, or lithium hydroxide. Among them, when sodium hydroxide is used in combination with ethylene glycol, etc., the reaction rate and reaction rate are excellent.
- the acid may be an organic or inorganic acid and may include, for example, hydrochloric acid, nitric acid, sulfuric acid, carbonic acid, phosphoric acid, acetic acid, hypochlorous acid (HClO), or mixtures thereof.
- Salts may include inorganic acid salts such as carbonate, hydrogen carbonate, phosphate, sulfate, sulfite, nitrate, silicate, hypochlorite, and organic acid salt such as formate, acetate, citrate, oxalate, or mixtures thereof, for example,
- it may include sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium hydrogen carbonate, tripotassium phosphate (hydrate), sodium hypochlorite, or a mixture thereof.
- Polyhydric alcohols include ethylene glycol, n-propylene glycol, isopropylene glycol, diethylene glycol, polyethylene glycol, triethylene glycol, dipropylene glycol, 1,3-butanediol, 1,4-butanediol, glycerin, benzyl alcohol, polypropylene glycol , pentaerythritol, trimethylolpropane, or mixtures thereof.
- ethylene glycol, n-propylene glycol, isopropylene glycol, diethylene glycol, polyethylene glycol, triethylene glycol, and glycerin having a high boiling point and relatively high reactivity can be used.
- the mono-alcohol may include methanol, ethanol, propanol, butanol, or a mixture thereof, and an alkyl ether compound of a polyhydric alcohol such as diol or triol exemplified above, for example, diethylene glycol monomethyl ether or benzyl alcohol; 2-ethyl hexanol and the like.
- a polyhydric alcohol such as diol or triol exemplified above, for example, diethylene glycol monomethyl ether or benzyl alcohol; 2-ethyl hexanol and the like.
- the amount of the bleaching agent may be added in an amount of 0.05 to 1.5 mol based on 1.0 mol of the dibasic acid contained in the polyester, for example, a monovalent bleaching agent (eg sodium hydroxide) It is suitable to be added in an amount of 0.1 to 1.5 moles, and in the case of a divalent decolorizing agent (eg, calcium carbonate), it is suitable to be added in an amount of 0.05 to 0.75 moles.
- a monovalent bleaching agent eg sodium hydroxide
- a divalent decolorizing agent eg, calcium carbonate
- the amount of dye added during processing varies from 0.5% to 20% by weight of the weight of the polyester fiber (based on on the weight of fabric (o.w.f.)). It is preferable that the decomposition be at least 1.0 mole based on 1.0 mole of the dibasic acid contained in the polyester so that all decomposition can be decomposed.
- a method of depolymerizing polyester according to another embodiment includes decolorizing the polyester, and depolymerizing the decolorized polyester.
- the polyester may be a polyester formed by polymerization of a dibasic acid and an alkylene glycol, for example, polyethylene terephthalate (PET), polybutylene terephthalate, or polyethylene naphthalate, or polycaprolactone formed by polymerization of caprolactone.
- PET polyethylene terephthalate
- PBT polybutylene terephthalate
- polyethylene naphthalate polyethylene naphthalate
- polycaprolactone formed by polymerization of caprolactone.
- the alkylene glycol obtainable by depolymerizing polyester is, for example, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, 1,3-butanediol, 1,4-butanediol. , 3-methyl-1,5-pentanediol, 1,6-hexanediol, 1,9-nonanediol, neopentyl glycol, polytetramethylene glycol, 1,4-cyclohexanediol, 1,4-benzene diol, etc. can be heard
- the polyester is polyethylene terephthalate
- ethylene glycol can be recovered as alkylene glycol
- butylene glycol can be recovered as a monomer when the polyester is polybutylene terephthalate.
- dibasic acid obtainable by depolymerizing polyester examples include terephthalic acid, phthalic acid (ortho), isophthalic acid, dibromoisophthalic acid, sodium sulfoisophthalate, phenylenedioxydicarboxylic acid, 4,4' -diphenyldicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 4,4'-diphenylketone dicarboxylic acid, 4,4'-diphenoxyethanedicarboxylic acid, 4,4'- and aromatic dicarboxylic acids such as diphenyl sulfone dicarboxylic acid, 2,6-naphthalene dicarboxylic acid, trimellitic acid and pyromellitic acid.
- dicarboxylic acids for example, alicyclic dicarboxylic acids such as hexahydro terephthalic acid, hexahydroisophthalic acid, and succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid , aliphatic dicarboxylic acids such as undecadicarboxylic acid and dodecadicarboxylic acid.
- alicyclic dicarboxylic acids such as hexahydro terephthalic acid, hexahydroisophthalic acid, and succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid
- aliphatic dicarboxylic acids such as undecadicarboxylic acid and dodecadicarboxylic acid.
- the hydrolysis method can be decomposed into terephthalic acid and ethylene glycol, for example, by reacting a polyethylene terephthalate melt with water and then with ammonium hydroxide.
- polyester in the alcoholysis method, polyester can be depolymerized, for example, by heating in an alcohol solvent (adding a catalyst if necessary).
- This method has the advantage that, for example, when polyethylene terephthalate is depolymerized using methanol as a solvent, dimethyl terephthalate (DMT), a useful and easy-to-handle monomer, is directly produced by the depolymerization reaction, and the depolymerization reaction is also relatively fast.
- DMT dimethyl terephthalate
- bis( ⁇ -hydroxyalkyl) terephthalate and ethylene glycol can be produced by depolymerizing polyester by heating it together with a depolymerization catalyst such as sodium carbonate in an excess alkylene glycol solvent.
- a depolymerization catalyst such as sodium carbonate
- ethylene glycol is used as a solvent
- bis( ⁇ -hydroxyethyl) terephthalate (BHET) is produced by depolymerization, and methanol is added in the presence of a transesterification catalyst to carry out a transesterification reaction.
- DMT Terephthalate
- the depolymerization may include preparing a reaction solution, immersing the polyester in the reaction solution, and heating the reaction solution to depolymerize the reaction solution.
- the reaction solution may be prepared by dissolving the reaction catalyst in a solvent.
- the reaction catalyst may include an alkali, an acid, or a salt thereof
- the solvent may include water, a monoalcohol, a polyhydric alcohol, or a mixture thereof.
- Alkali, acid, salts thereof, monoalcohol, or polyhydric alcohol may be the same as those used in the decolorization step, and thus a repetitive description will be omitted.
- the amount added to the solvent of the reaction catalyst may be 0.01 to 100 moles, for example, 0.1 to 10 moles, or 0.8 to 1.2 moles, based on 1 mole of the dibasic acid constituting the polyester.
- the reaction formula is PET (polyethylene terephthalate) + 2NaOH ⁇ TPA salt (disodium terephthalate) + EG (ethylene glycol), so 1 kg of PET 2 moles of NaOH (420 g) are required per mole of TPA to decompose.
- the polyester is immersed in the prepared reaction solution.
- an additional pretreatment step of washing the waste and removing contaminants attached to the waste, for example, contents or soil, may optionally be performed before the depolymerization step.
- the waste and the like may be mechanically cut, pulverized, and processed.
- the pulverization treatment may be performed using a known suitable means, for example, the polyester waste may be pulverized into pieces having a size of 2 mm to 8 mm by pulverization using a hammer mill or the like, and then used for depolymerization.
- the pulverized chip may be immersed in a solvent to separate components lighter than the solvent, and the pulverized product may be blown with the wind or only a predetermined size may be recovered using a sieve and provided for depolymerization.
- the alkylene glycol and the dibasic acid salt are separated and recovered from the depolymerization product obtained in the depolymerization step.
- alkylene glycol which is a component of polyester, and other alcohols are used as the reaction solvent
- the alkylene glycol produced by depolymerization and the reaction solvent are once mixed, but the Alkylene glycol can be recovered.
- a method for separating the alkylene glycol produced by the depolymerization reaction and the reaction solvent is not particularly limited in the present invention, and an appropriate method may be selected according to the target compound, and may be separated by, for example, distillation and concentration method.
- a conventional distillation concentration apparatus for example, a reduced pressure continuous distillation apparatus, a reduced pressure batch type distillation apparatus, and the like may be used.
- a hydrolysis method using a hydroxyl group (OH) group, an alcoholysis method using an alcohol, and a glycolysis method using a glycol may be selectively applied.
- the type of dibasic acid obtained varies.
- the obtained dibasic acid salt may change depending on the type of the reaction solvent used for the depolymerization reaction.
- the reaction solvent used for the depolymerization reaction For example, when depolymerizing polyethylene terephthalate using ethylene glycol as a reaction solvent, bis( ⁇ -hydroxyethyl) terephthalate (BHET) can be obtained as a monomer, and when depolymerizing using propylene glycol as a reaction solvent , mainly bis( ⁇ -hydroxyethyl isopropyl)terephthalate (BHEPT) can be obtained as a monomer.
- BHET bis( ⁇ -hydroxyethyl) terephthalate
- BHEPT mainly bis( ⁇ -hydroxyethyl isopropyl)terephthalate
- the obtained oligomer ester compound has very good solubility in chloroform or the like, and thus can be efficiently recovered by solvent extraction.
- the ester compound of a dibasic acid or an oligomer can also be collect
- ester compound of a dibasic acid or oligomer eg BHET
- DMT methyl ester of a dibasic acid or oligomer
- the depolymerization reaction concentrate and methanol are transesterified in the presence of a transesterification catalyst (alkali metal compound, etc.) at 65° C. to 85° C. for 0.5 hours to 5 hours.
- a transesterification catalyst alkali metal compound, etc.
- purified DMT can be collect
- polyester when polyester is depolymerized using the glycolysis method, a dibasic acid salt such as a dibasic acid or a dialkali metal salt of an oligomer may be produced, and this product varies depending on the type of alkali metal used in the depolymerization reaction.
- a dibasic acid salt such as a dibasic acid or a dialkali metal salt of an oligomer
- this product varies depending on the type of alkali metal used in the depolymerization reaction.
- sodium terephthalate is produced together with ethylene glycol.
- dibasic acid salts eg, sodium terephthalate
- filtration such as solid-liquid separation
- alcohol adhering to the obtained powdery crystal can be removed by washing with alcohol, such as methanol or ethanol.
- a dibasic acid eg, terephthalic acid
- a dibasic acid salt can be obtained by dissolving the crystals of the dibasic acid salt in water, followed by a neutralization reaction by mixing an acid. Since the dibasic acid also precipitates as crystals in water, it can be recovered by solid-liquid separation from water by a method such as centrifugation treatment.
- the amount of water added during the recovery process may be 3 to 10 weights based on 1 weight of the dibasic acid salt.
- the content of the acid supplied to separate the dibasic acid may be equimolar or more with the alkali metal contained in the dibasic acid salt, and the type of acid used in this case is an inorganic acid such as hydrochloric acid, sulfuric acid, phosphoric acid, etc., or formic acid, which is a strong acid of pH 2, Organic acids such as acetic acid and oxalic acid can be used, and among them, inorganic acids, especially hydrochloric acid or sulfuric acid, are suitable because impurities in the produced monomer can be reduced.
- the neutralization reaction temperature may be 65° C. to 85° C., and the neutralization reaction can usually be completed within 0.5 hours to 5 hours.
- the polyester depolymerization method may further include selectively removing impurities contained in the polyester molded article or waste in the aqueous solution of the dibasic acid salt.
- the means for removing impurities is not particularly limited, and any suitable technique, apparatus, or the like may be used.
- solid content such as a resin (polyethylene, polypropylene, polyvinyl chloride, etc.) other than polyester remaining unreacted and a reaction catalyst such as an insoluble alkali metal can be removed using a mesh or the like.
- dyes, fillers, and the like cannot be removed from mesh or the like, they can be removed by centrifugation, filtration treatment with an adsorbent such as activated carbon, or the like.
- the method may further include recrystallizing the dibasic acid crystals to a commercially available particle size (100 ⁇ m or more) by selectively recrystallizing the dibasic acid crystals.
- the recrystallization method is not particularly limited, and for example, after mixing the dibasic acid crystal with water, it may be made under high temperature and high pressure conditions.
- the dibasic acid and alkylene glycol obtained by the depolymerization method of polyester can be recycled as monomers for polymerizing recycled polyester.
- the regenerated polyester may be prepared by esterifying and polycondensing a composition for polymerization of a regenerated polyester comprising a dibasic acid and an alkylene glycol obtained by the depolymerization method of the polyester.
- Esterification is a reaction between a recovered monomer, dibasic acid, and alkylene glycol, for example, terephthalic acid and ethylene glycol.
- This reaction may proceed without a catalyst, but may also be carried out in the presence of a catalyst such as alkaline earth metal compounds such as magnesium and calcium, and metal compounds such as titanium, zinc, and manganese, which are well known as transesterification catalysts.
- the product of the esterification process may be polycondensed to prepare a recycled polyester resin.
- both solution polymerization and solid-state polymerization may be used.
- a compound that promotes water treatment and/or crystallization may be added as necessary, and a polycondensation catalyst or stabilizer may be added at the beginning or during the polycondensation process.
- the water treatment may be performed by contacting the recycled polyester resin prepared in the form of solid particles, for example, with water, water vapor, an inert gas containing water vapor, air containing water vapor, or the like.
- the compound that promotes crystallization includes, for example, polyhexamethylene terephthalate, an inorganic compound, a higher aliphatic compound, a polyether-based compound, a polyolefin-based thermoplastic resin such as polypropylene, and polyethylene, and these compounds are recycled polyester resins It may be added in an amount of 1 ppm to 100 ppm.
- the addition amount of the polycondensation catalyst may be 2 ppm to 800 ppm, for example, 4 ppm to 500 ppm as the weight of the catalyst metal element based on the total weight of the dibasic acid component.
- the regenerated polyester is a stabilizer, such as phosphoric acid esters such as trimethyl phosphate, triethyl phosphate, triphenyl phosphate, and triethyl phosphonoacetate; phosphorous acid esters such as triphenyl phosphite and trisdodecyl phosphite; Phosphorus compounds such as phosphate, monobutyl phosphate, phosphoric acid, phosphorous acid, hypophosphorous acid, and polyphosphoric acid may be included.
- the amount of the stabilizer added may be 1000 ppm or less, for example, 500 ppm or less, or 300 ppm or less as the weight of elemental phosphorus in the stabilizer based on the total weight of the regenerated polyester.
- the depolymerization method of polyester decolorizes using superheated steam, and by adding a decolorant, the polyester is dissolved and decolorized only on the surface, and the discoloration does not occur inside the dissolved polyester.
- the color of the regenerated polyester produced using the dibasic acid and alkylene glycol thus obtained may have an L value of 60 or more, for example, 65 to 95.
- the L, a, and b color systems are commonly used internationally as standards for color evaluation of polyester.
- This color numerical value is one of the color systems for standardizing color measurements, and describes recognizable colors and color differences.
- L is the lightness factor and a and b are the color measures.
- the L value means a numerical factor indicating brightness, and is a very important number in the manufacture of textiles, fabrics or clothes.
- a positive b value means yellow discoloration
- a negative value means blue discoloration
- a positive a value means red discoloration
- a negative value means green discoloration.
- L, a, and b values are defined in KS A 0061, 0063, 0064, 0065, 0066, 0067, 0084, 0085, 0089, 0114, etc. in the Korean Industrial Standards (KS) related to color measurement.
- KS Korean Industrial Standards
- L, a The , and b values can be measured by measuring the color 10 times by putting 50 g of the polyester resin to be measured in a calorimeter model SA-2000 after removing moisture from the air, and setting the average value as a standard value.
- the L value of the recycled polyester is related to the purity of the recycled dibasic acid and alkylene glycol. For example, as the amount of an impurity or a matting agent such as titanium dioxide (TiO2) increases, the L value decreases. If the L value is less than 60, the amount of impurities is too large, and the color after polymerization and fiberization may be colored or it may not be used as a high value-added material due to many side reactions during polymerization. So it may not be meaningful. On the other hand, when the L value exceeds 95, it is a physical property that is difficult to reach even with existing virgin materials. The cost increase can lower the economy.
- an impurity or a matting agent such as titanium dioxide (TiO2)
- the content of sodium hydroxide impregnated in polyethylene terephthalate is 0.18 mol, 0.36 mol, and 1.08 mol, respectively, based on 1 mol of terephthalic acid.
- the content of sodium hydroxide impregnated in polyethylene terephthalate is 0.18 mol, respectively, based on 1 mol of terephthalic acid.
- the temperature can be increased to 265 °C, but the target high-pressure steam production equipment is expensive and the cost-effectiveness is not low.
- L, a, and b values 50 g of decolorized polyethylene terephthalate was removed from the air, and the color was measured 10 times in a calorimeter model SA-2000, and the average value was set as a standard value.
- FIGS. 1 and 2 photos before and after the discoloration treatment of polyethylene terephthalate in Example 3 and Comparative Example 1 are shown in FIGS. 1 and 2 , respectively.
- the photo on the left is a photo before the bleaching treatment
- the photo on the right is a photo after the bleaching process.
- FIGS. 1 and 2 it can be seen that a part of the polyethylene terephthalate treated with discoloration is carbonized as a result of Comparative Example 1, and it can be seen that Examples 1 to 3 have excellent color compared to Comparative Example 2. can This is because, in Comparative Example 2, the dye of the colored waste fibers was not completely decomposed by using low-temperature general steam at 196° C. instead of superheated steam.
- the present invention relates to a decolorization method of polyester, particularly a colored polyester in which a large amount of dye is added during processing, and a depolymerization method including the same, and it is possible to remove the dye of the colored polyester at low cost and with high efficiency.
Abstract
Description
색상 | |||
L | a | b | |
실시예 1 | 81.4 | 1.7 | 1.9 |
실시예 2 | 88.3 | 0.2 | 1.3 |
실시예 3 | 90.8 | -0.9 | 0.1 |
비교예 1 | 탄화 | 탄화 | 탄화 |
비교예 2 | 56.3 | 4.6 | 11.6 |
Claims (16)
- 알칼리, 산, 이들의 염(salt), 모노 알코올, 다가 알코올, 또는 이들의 혼합물을 포함하는 탈색제를 폴리에스테르에 첨가한 후,상기 폴리에스테르에 과열 수증기를 접촉시키는 단계를 포함하는, 폴리에스테르의 탈색 방법.
- 제1항에서,상기 과열 수증기의 온도는 250 ℃ 내지 450 ℃인, 폴리에스테르의 탈색 방법.
- 제1항에서,상기 과열 수증기는 0.1 bar 내지 2 bar의 분사 압력으로 가해지는, 폴리에스테르의 탈색 방법.
- 제1항에서,상기 탈색 단계는 1 분 내지 60 분 동안 이루어지는, 폴리에스테르의 탈색 방법.
- 제1항에서,상기 알칼리는 수산화나트륨, 수산화칼륨, 수산화리튬, 암모니아, 또는 이들의 혼합물을 포함하는, 폴리에스테르의 탈색 방법.
- 제1항에서,상기 산은 염산, 질산, 황산, 탄산, 인산, 아세트산, 차아염소산(HClO), 또는 이들의 혼합물을 포함하는, 폴리에스테르의 탈색 방법.
- 제1항에서,상기 염은 탄산염, 탄산수소염, 인산염, 황산염, 아황산염, 질산염, 규산염, 차아염소산염, 포름산염, 아세트산염, 구연산염, 옥살산염, 또는 이들의 혼합물을 포함하는, 폴리에스테르의 탈색 방법.
- 제1항에서,상기 모노 알코올은 메탄올, 에탄올, 프로판올, 부탄올, 또는 이들의 혼합물을 포함하는, 폴리에스테르의 탈색 방법.
- 제1항에서,상기 다가 알코올은 에틸렌 글리콜, n-프로필렌 글리콜, 이소프로필렌 글리콜, 디에틸렌 글리콜, 폴리에틸렌 글리콜, 트리에틸렌 글리콜, 디프로필렌 글리콜, 1,3-부탄디올, 1,4-부탄디올, 글리세린, 벤질 알코올, 폴리프로필렌 글리콜, 펜타에리트리톨, 트리메티롤프로판, 또는 이들의 혼합물을 포함하는, 폴리에스테르의 탈색 방법.
- 제1항에서,상기 탈색제는 상기 폴리에스테르가 포함하는 이염기산 1.0 몰에 대하여 0.05 몰 내지 1.5 몰로 첨가되는, 폴리에스테르의 탈색 방법.
- 알칼리, 산, 이들의 염(salt), 모노 알코올, 다가 알코올, 또는 이들의 혼합물을 포함하는 탈색제를 폴리에스테르에 첨가한 후, 상기 폴리에스테르에 과열 수증기를 접촉시켜 폴리에스테르를 탈색시키는 단계,상기 탈색된 폴리에스테르를 해중합시켜 알킬렌 글리콜과 이염기산염을 포함하는 해중합 생성물을 얻는 단계,상기 해중합 생성물로부터 액상의 알킬렌 글리콜과 고상의 이염기산염을 고액분리하는 단계,상기 고상의 이염기산염을 물에 용해시키는 단계,상기 이염기산염의 수용액을 산으로 중화하여 이염기산 결정을 석출시키는 단계, 및상기 석출 생성물로부터 이염기산 결정을 고액분리하는 단계를 포함하는 폴리에스테르의 해중합 방법.
- 제11항에서,상기 폴리에스테르의 해중합 방법은, 상기 이염기산염의 수용액에서 불순물을 제거하는 단계를 더 포함하는, 폴리에스테르의 해중합 방법.
- 제11항에서,상기 폴리에스테르의 해중합 방법은, 상기 이염기산 결정을 재결정시키는 단계를 더 포함하는, 폴리에스테르의 해중합 방법.
- 제11항에 따른 폴리에스테르의 해중합 방법에 의하여 얻어진, 이염기산 및 알킬렌 글리콜을 포함하는, 재생 폴리에스테르 중합용 조성물.
- 제14항에 따른 폴리에스테르 중합용 조성물을 이용하여 제조된, 재생 폴리에스테르.
- 제15항에서,상기 재생 폴리에스테르의 색상은 L값이 60 이상인, 재생 폴리에스테르.
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CN202180090827.4A CN116710509A (zh) | 2021-01-14 | 2021-11-03 | 聚酯的脱色方法和包括该方法的聚酯的解聚方法 |
EP21919847.0A EP4257635A1 (en) | 2021-01-14 | 2021-11-03 | Method for decolorizing polyester, and method for depolymerising polyester comprising same |
US18/260,791 US20240052130A1 (en) | 2021-01-14 | 2021-11-03 | Method for decolorizing polyester and method for depolymerising polyester comprising the same |
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2021
- 2021-01-14 KR KR1020210005357A patent/KR20220102883A/ko not_active Application Discontinuation
- 2021-11-03 JP JP2023542586A patent/JP2024502493A/ja active Pending
- 2021-11-03 EP EP21919847.0A patent/EP4257635A1/en active Pending
- 2021-11-03 US US18/260,791 patent/US20240052130A1/en active Pending
- 2021-11-03 CN CN202180090827.4A patent/CN116710509A/zh active Pending
- 2021-11-03 WO PCT/KR2021/015812 patent/WO2022154223A1/ko active Application Filing
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US20240052130A1 (en) | 2024-02-15 |
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