CN1670011A - Method for separating catalyst from ester interchange reaction solution - Google Patents
Method for separating catalyst from ester interchange reaction solution Download PDFInfo
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- CN1670011A CN1670011A CN 200410022038 CN200410022038A CN1670011A CN 1670011 A CN1670011 A CN 1670011A CN 200410022038 CN200410022038 CN 200410022038 CN 200410022038 A CN200410022038 A CN 200410022038A CN 1670011 A CN1670011 A CN 1670011A
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- ester
- ketone
- catalyzer
- filtrate
- low
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 150000002148 esters Chemical class 0.000 title claims abstract description 20
- 239000003054 catalyst Substances 0.000 title claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 title claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- 150000002576 ketones Chemical class 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- -1 aryl compound ester Chemical class 0.000 claims abstract description 8
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 7
- 239000012295 chemical reaction liquid Substances 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 5
- 239000000706 filtrate Substances 0.000 claims description 20
- ROORDVPLFPIABK-UHFFFAOYSA-N diphenyl carbonate Chemical compound C=1C=CC=CC=1OC(=O)OC1=CC=CC=C1 ROORDVPLFPIABK-UHFFFAOYSA-N 0.000 claims description 13
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 238000004821 distillation Methods 0.000 claims description 7
- CXHHBNMLPJOKQD-UHFFFAOYSA-M methyl carbonate Chemical compound COC([O-])=O CXHHBNMLPJOKQD-UHFFFAOYSA-M 0.000 claims description 7
- 238000003786 synthesis reaction Methods 0.000 claims description 7
- 238000005809 transesterification reaction Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 4
- YCWSUKQGVSGXJO-NTUHNPAUSA-N nifuroxazide Chemical group C1=CC(O)=CC=C1C(=O)N\N=C\C1=CC=C([N+]([O-])=O)O1 YCWSUKQGVSGXJO-NTUHNPAUSA-N 0.000 claims description 3
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 238000004040 coloring Methods 0.000 claims description 2
- JGFBRKRYDCGYKD-UHFFFAOYSA-N dibutyl(oxo)tin Chemical compound CCCC[Sn](=O)CCCC JGFBRKRYDCGYKD-UHFFFAOYSA-N 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims 3
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims 2
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims 2
- JMXKSZRRTHPKDL-UHFFFAOYSA-N titanium ethoxide Chemical compound [Ti+4].CC[O-].CC[O-].CC[O-].CC[O-] JMXKSZRRTHPKDL-UHFFFAOYSA-N 0.000 claims 2
- 229910021591 Copper(I) chloride Inorganic materials 0.000 claims 1
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims 1
- 229910021626 Tin(II) chloride Inorganic materials 0.000 claims 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims 1
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims 1
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 claims 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims 1
- YMLFYGFCXGNERH-UHFFFAOYSA-K butyltin trichloride Chemical compound CCCC[Sn](Cl)(Cl)Cl YMLFYGFCXGNERH-UHFFFAOYSA-K 0.000 claims 1
- OXBLHERUFWYNTN-UHFFFAOYSA-M copper(I) chloride Chemical compound [Cu]Cl OXBLHERUFWYNTN-UHFFFAOYSA-M 0.000 claims 1
- 229940045803 cuprous chloride Drugs 0.000 claims 1
- 239000012975 dibutyltin dilaurate Substances 0.000 claims 1
- 229940046892 lead acetate Drugs 0.000 claims 1
- 235000011150 stannous chloride Nutrition 0.000 claims 1
- AFCAKJKUYFLYFK-UHFFFAOYSA-N tetrabutyltin Chemical compound CCCC[Sn](CCCC)(CCCC)CCCC AFCAKJKUYFLYFK-UHFFFAOYSA-N 0.000 claims 1
- AXZWODMDQAVCJE-UHFFFAOYSA-L tin(II) chloride (anhydrous) Chemical compound [Cl-].[Cl-].[Sn+2] AXZWODMDQAVCJE-UHFFFAOYSA-L 0.000 claims 1
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 238000000151 deposition Methods 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 230000001376 precipitating effect Effects 0.000 abstract 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000011084 recovery Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 4
- 238000001291 vacuum drying Methods 0.000 description 4
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000006315 carbonylation Effects 0.000 description 2
- 238000005810 carbonylation reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002815 homogeneous catalyst Substances 0.000 description 2
- GBMDVOWEEQVZKZ-UHFFFAOYSA-N methanol;hydrate Chemical compound O.OC GBMDVOWEEQVZKZ-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- HKEUSHDVFNSFLJ-UHFFFAOYSA-N C(C=1C(C(=O)OC2=CC=CC=C2)=CC=CC1)(=O)OC1=CC=CC=C1.[C] Chemical compound C(C=1C(C(=O)OC2=CC=CC=C2)=CC=CC1)(=O)OC1=CC=CC=C1.[C] HKEUSHDVFNSFLJ-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229940106691 bisphenol a Drugs 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 231100000004 severe toxicity Toxicity 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater 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 relates to a method for separating catalysts from the exchange reaction liquid between dialkyl carbonate and aryl compound ester, which comprises: vacuum distilling the ester exchange reaction liquid, then adding the mixture which is on the bottom of the kettle into a low carbon alcohol, ketone or ester liquid, heating to dissolve them partly, filtering the insoluble catalysts and adding water into the filter liquor as a precipitating agent, depositing the residual catalysts, drying the separated catalyst to circulating utilize.
Description
The invention belongs to a kind of from ester exchange reaction liquid method of separating catalyst the miscellany at the bottom of the still after underpressure distillation, particularly a kind of catalyst separating of the aromatic hydroxy compound synthesizing diphenyl carbonate by using ester exchange from dialkyl carbonate and phenol and so on.
Diaryl carbonate (particularly diphenyl carbonate) is a kind of important Organic Chemicals, can be used for synthetic many important organic compound and macromolecular material, particularly replaces hypertoxic phosgene and the good polycarbonate of bisphenol-a reaction production performance.The synthetic method of diphenyl carbonate has phosgenation, ester-interchange method and phenol oxidation carbonylation method.Because the phosgene severe toxicity, environmental pollution is serious, progressively is eliminated; Catalyzer costliness and transformation efficiency that the phenol oxidation carbonylation method is used are low, do not see the industrialization report as yet; And ester-interchange method is considered to the proper method of present diphenyl carbonate synthesis: phenol and methylcarbonate react in the presence of catalyzer and generate diphenyl carbonate, produce a kind of operational path of methyl alcohol simultaneously.With regard to synthesis of diphenyl carbonate by ester exchange reaction, when adopting homogeneous catalyst, there are the difficulty of Separation and Recovery in catalyzer and product, be difficult to separate with the method for traditional rectifying, in ester-exchange reaction, can produce a spot of impurity such as tar simultaneously, isolate from reactive system as untimely, will accumulate and influence the quality of product.Therefore, it is significant to reaction process to develop a kind of catalyst separating recovery method.
At present, the catalyzer that is used for phenol and methylcarbonate synthesis of diphenyl carbonate by ester exchange reaction is homogeneous catalyst mostly.It is the ester exchange process of catalyzer carbonate synthesis diaryl and the separation method of reaction solution with metatitanic acid four phenyl esters that Japanese Patent JP09169704 discloses a kind of.This technology is raw material with methylcarbonate, phenol, with metatitanic acid four phenyl esters [Ti (OPh)
4] be catalyzer, ester exchange synthesizing diphenyl carbonate.At first at 200 ℃, under the 2666Pa mixture is flashed off phenol and carbonic acid toluene ester, remove catalyzer, again at 150～230 ℃, 667～2666Pa continues distillation down, can obtain catalyst content Ti (OPh)
4≤ 10
-6Diphenyl carbonate, recyclable about 79% Ti (OPh) at the bottom of still simultaneously
4Catalyzer.This process using tradition distil process continues the retort carbon diphenyl phthalate in the hot environment that has catalyzer to exist, be easy to cause diphenyl carbonate to decompose.Catalyst recovery yield is not high, in addition this method for organo-tin compound (as Dibutyltin oxide) be catalyzer reaction system separation and be not suitable for, because under above-mentioned separation condition, organotin catalysts is difficult to separate effectively with diphenyl carbonate.
United States Patent (USP) 5606103 employing caustic washing method are removed the organotin catalysts in the transesterification reaction liquid.Earlier wash twice, wash once with 15% sodium chloride solution again with 15% sodium hydroxide solution.According to the difference of reaction system, the scope of remaining tin content is between 25～1160ppm.If but introduce alkali lye in the reaction solution of dialkyl carbonate and aromatic hydroxy compound transesterify carbonate synthesis diaryl is inappropriate, because being easy to be dissolved in, unreacted aromatic hydroxy compound forms salt in the alkali lye, cause significant loss, and must increase the postprocessing working procedures of waste water.These not only make operational path become complicated, and have improved running cost.
The objective of the invention is to improve at above-mentioned transesterification reaction deficiency, the method that provides a kind of catalyst separating to reclaim, be particularly suitable for the reaction process of ester-interchange method diphenyl carbonate synthesis, this method is made separating agent with by-product carbinol earlier, use water as precipitation agent again, the catalyzer at the bottom of the separating still in the miscellany, the rate of recovery of catalyzer can reach more than 99%, advantages such as it is low to have running cost, and technology is simple.
Concrete implementation method may further comprise the steps:
With ester exchange reaction liquid after underpressure distillation at the bottom of the still miscellany join in a kind of low-carbon alcohol, ketone or the ester class solution, the weight of low-carbon alcohol, ketone or ester class is mixture 30～5000% at the bottom of the still, miscellany is heated to 30～150 ℃, cooled and filtered, most catalyzer is separated to be fallen, and coloring matter and tar enter filtrate.
2. in filtrate, add be 4～60% water of low-carbon alcohol, ketone or ester class weight as precipitation agent, remaining catalyzer in the separating filtrate.
3. after the catalyzer drying is removed organic solvent and water, continue on for transesterification reaction.Low-carbon alcohol, ketone or ester class and water reclaim the back recycling in the filtrate.
Introduce example of the present invention below:
[example one]
In the time of 25 ℃ toward 9.3g in the miscellany of underpressure distillation phenol and methylcarbonate transesterification reaction, add the 170g methanol solution.System is heated to 65 ℃ and stirred cooled and filtered 0.5-1 hour.The heavy 173.4g of filtrate.Being deposited in the weight of 45 ℃ of following vacuum-dryings after 24 hours is 5.11g.Filtrate is added 20 gram water to filtrate under 25 ℃, non-pressurized condition, must be deposited in the weight of 45 ℃ of following vacuum-dryings after 24 hours is 0.65g, the heavy 193.5g of remaining filtrate.Get catalyst solid 5.76g, purity 99.9%, the rate of recovery 99.3% of catalyzer.The weight and the composition of each section material see Table 1:
Each stage material of table 1. is formed table
| Each section material | Weight g | The weight g that each is formed | ||||||
| Methyl alcohol | Water | ????DMC | Phenol | ????MPC | ??DPC | Catalyzer | ||
| Miscellany at the bottom of the still | ??9.30 | ?0 | ???0 | ????0 | ??1.30 | ????0 | ??2.20 | ??5.80 |
| Filtrate for the first time | ??173.40 | ?169.12 | ???0 | ????0.20 | ??1.30 | ????0 | ??2.10 | ??0.68 |
| First is drying precipitated | ??5.11 | ?0 | ???0 | ????0 | ??0 | ????0 | ??0 | ??5.11 |
| Filtrate for the second time | ??192.75 | ?168.16 | ???19.83 | ????0.80 | ??1.70 | ????1.20 | ??1.05 | ??0.01 |
| Second is drying precipitated | ??0.65 | ?0 | ???0 | ????0 | ??0 | ????0 | ??0 | ??0.65 |
[example two]
In the time of 25 ℃ toward 10g in the miscellany of underpressure distillation phenol and methylcarbonate transesterification reaction, add 170g methylcarbonate solution.System is heated to 85 ℃ and stirred 0.5-1 hour, cooled and filtered, and the heavy 174.1g of filtrate, being deposited in the weight of 45 ℃ of following vacuum-dryings after 24 hours is 5.30g.Filtrate is added 20 gram water to filtrate under 25 ℃, non-pressurized condition, must be deposited in the weight of 45 ℃ of following vacuum-dryings after 24 hours is 0.90g, the heavy 194.0g of remaining filtrate.Get catalyst solid 6.20g, purity 99.9%, the rate of recovery 99.4% of catalyzer.The weight and the composition of each section material see Table 2:
Each stage material of table 2. is formed table
| Each section material | Weight g | The weight g that each is formed | ||||||
| Methyl alcohol | Water | ??DMC | Phenol | ????MPC | ??DPC | Catalyzer | ||
| Miscellany at the bottom of the still | 10.00 | ????0 | ????0 | ??0 | ????1.39 | ????0 | ??2.37 | ??6.24 |
| Filtrate for the first time | 174.10 | ????0 | ????0 | ??169.79 | ????1.30 | ????0 | ??2.10 | ??0.91 |
| First is drying precipitated | 5.30 | ????0 | ????0 | ??0 | ????0 | ????0 | ??0 | ??5.30 |
| Filtrate for the second time | 194.00 | ????0 | ????19.93 | ??169.40 | ????2.40 | ????1.20 | ??1.06 | ??0.01 |
| Second is drying precipitated | 0.90 | ????0 | ????0 | ??0 | ????0 | ????0 | ??0 | ??0.90 |
Claims (3)
1. a reaction solution that carries out transesterification reaction carbonate synthesis diaryl (particularly diphenyl carbonate) from dialkyl carbonate and the aromatic hydroxy compound method of separating catalyst the miscellany at the bottom of the still after underpressure distillation may further comprise the steps:
(1) ester exchange reaction liquid after underpressure distillation at the bottom of the still miscellany join in a kind of low-carbon alcohol, ketone or the ester class solution, the weight of low-carbon alcohol, ketone or ester class is miscellany 30～5000% at the bottom of the still, miscellany is heated to 30～150 ℃, cooled and filtered, isolate insoluble catalyzer, coloring matter and tar enter filtrate.
(2) in filtrate, add be 4～60% water of low-carbon alcohol, ketone or ester class volume as precipitation agent, remaining catalyzer in the separating filtrate.
(3) isolated catalyzer drying is handled the back recycle, and low-carbon alcohol, ketone or ester class and water reclaim the back recycling in the filtrate.
2. according to the described method of claim 1, it is characterized in that low-carbon alcohol, ketone or ester class comprise: methyl alcohol, ethanol, n-propyl alcohol, Virahol, acetone, butanone, methylcarbonate, ethyl acetate.
3. according to the described method of claim 1, it is characterized in that the catalyzer of transesterify comprises: butyl (tetra) titanate, metatitanic acid tetramethyl ester, tetraethyl titanate, isopropyl titanate, metatitanic acid four phenyl esters, tetrabutyl titanate, Dibutyltin oxide, butyl tin trichloride, tetrabutyl tin, dibutyl tin dilaurate, lead acetate, tin protochloride, cuprous chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410022038 CN1670011A (en) | 2004-03-17 | 2004-03-17 | Method for separating catalyst from ester interchange reaction solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410022038 CN1670011A (en) | 2004-03-17 | 2004-03-17 | Method for separating catalyst from ester interchange reaction solution |
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| Publication Number | Publication Date |
|---|---|
| CN1670011A true CN1670011A (en) | 2005-09-21 |
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ID=35041476
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|---|---|---|---|
| CN 200410022038 Pending CN1670011A (en) | 2004-03-17 | 2004-03-17 | Method for separating catalyst from ester interchange reaction solution |
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| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104513234A (en) * | 2014-12-28 | 2015-04-15 | 江苏天容集团股份有限公司 | Synthesis method for high-quality quizalofop-P-tefuryl |
| WO2018124613A1 (en) * | 2016-12-30 | 2018-07-05 | 롯데첨단소재(주) | Method for preparing aromatic carbonic acid diester |
| CN111072519A (en) * | 2019-12-17 | 2020-04-28 | 南通天泽化工有限公司 | Preparation method of cyanoethyl ester |
| CN113577814A (en) * | 2021-08-16 | 2021-11-02 | 四川中蓝国塑新材料科技有限公司 | Diphenyl carbonate recovery device and method for industrial production of polycarbonate |
-
2004
- 2004-03-17 CN CN 200410022038 patent/CN1670011A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104513234A (en) * | 2014-12-28 | 2015-04-15 | 江苏天容集团股份有限公司 | Synthesis method for high-quality quizalofop-P-tefuryl |
| CN104513234B (en) * | 2014-12-28 | 2017-07-14 | 江苏天容集团股份有限公司 | A kind of method for synthesizing high-quality quizalofopPtefuryl |
| WO2018124613A1 (en) * | 2016-12-30 | 2018-07-05 | 롯데첨단소재(주) | Method for preparing aromatic carbonic acid diester |
| CN111072519A (en) * | 2019-12-17 | 2020-04-28 | 南通天泽化工有限公司 | Preparation method of cyanoethyl ester |
| CN111072519B (en) * | 2019-12-17 | 2022-05-27 | 南通天泽化工有限公司 | Preparation method of cyanoethyl ester |
| CN113577814A (en) * | 2021-08-16 | 2021-11-02 | 四川中蓝国塑新材料科技有限公司 | Diphenyl carbonate recovery device and method for industrial production of polycarbonate |
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