CN108546329A - 一种聚酯多元醇的制备方法 - Google Patents
一种聚酯多元醇的制备方法 Download PDFInfo
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- CN108546329A CN108546329A CN201810366004.XA CN201810366004A CN108546329A CN 108546329 A CN108546329 A CN 108546329A CN 201810366004 A CN201810366004 A CN 201810366004A CN 108546329 A CN108546329 A CN 108546329A
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- Prior art keywords
- acid
- preparation
- reaction
- polyester polyol
- polyalcohol
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229920005906 polyester polyol Polymers 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 claims abstract description 34
- 239000003054 catalyst Substances 0.000 claims abstract description 32
- 239000011261 inert gas Substances 0.000 claims abstract description 14
- -1 cyclic ester Chemical class 0.000 claims abstract description 13
- 238000005886 esterification reaction Methods 0.000 claims abstract description 9
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000035484 reaction time Effects 0.000 claims abstract description 8
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 42
- 239000002253 acid Substances 0.000 claims description 21
- 150000005846 sugar alcohols Polymers 0.000 claims description 19
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 15
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims description 12
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 claims description 12
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims description 12
- 150000001991 dicarboxylic acids Chemical class 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- OZJPLYNZGCXSJM-UHFFFAOYSA-N 5-valerolactone Chemical compound O=C1CCCCO1 OZJPLYNZGCXSJM-UHFFFAOYSA-N 0.000 claims description 9
- 150000002148 esters Chemical group 0.000 claims description 8
- JBFHTYHTHYHCDJ-UHFFFAOYSA-N gamma-caprolactone Chemical compound CCC1CCC(=O)O1 JBFHTYHTHYHCDJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000001361 adipic acid Substances 0.000 claims description 6
- 235000011037 adipic acid Nutrition 0.000 claims description 6
- 230000032050 esterification Effects 0.000 claims description 6
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 claims description 6
- TYFQFVWCELRYAO-UHFFFAOYSA-N suberic acid Chemical compound OC(=O)CCCCCCC(O)=O TYFQFVWCELRYAO-UHFFFAOYSA-N 0.000 claims description 6
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 claims description 5
- 125000003118 aryl group Chemical group 0.000 claims description 5
- JJTUDXZGHPGLLC-UHFFFAOYSA-N lactide Chemical compound CC1OC(=O)C(C)OC1=O JJTUDXZGHPGLLC-UHFFFAOYSA-N 0.000 claims description 5
- PWLXTFFHCFWCGG-UHFFFAOYSA-N Heneicosanedioic acid Chemical compound OC(=O)CCCCCCCCCCCCCCCCCCCC(O)=O PWLXTFFHCFWCGG-UHFFFAOYSA-N 0.000 claims description 4
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 4
- 125000001931 aliphatic group Chemical group 0.000 claims description 4
- ZSTLPJLUQNQBDQ-UHFFFAOYSA-N azanylidyne(dihydroxy)-$l^{5}-phosphane Chemical group OP(O)#N ZSTLPJLUQNQBDQ-UHFFFAOYSA-N 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 claims description 4
- 238000010792 warming Methods 0.000 claims description 4
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 claims description 3
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 claims description 3
- YFHICDDUDORKJB-UHFFFAOYSA-N trimethylene carbonate Chemical compound O=C1OCCCO1 YFHICDDUDORKJB-UHFFFAOYSA-N 0.000 claims description 3
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 claims description 2
- 238000006555 catalytic reaction Methods 0.000 claims description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims 2
- QFGCFKJIPBRJGM-UHFFFAOYSA-N 12-[(2-methylpropan-2-yl)oxy]-12-oxododecanoic acid Chemical compound CC(C)(C)OC(=O)CCCCCCCCCCC(O)=O QFGCFKJIPBRJGM-UHFFFAOYSA-N 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 230000003197 catalytic effect Effects 0.000 abstract description 5
- 238000002156 mixing Methods 0.000 abstract description 3
- 238000005580 one pot reaction Methods 0.000 abstract description 2
- 239000012295 chemical reaction liquid Substances 0.000 abstract 1
- 125000004185 ester group Chemical group 0.000 abstract 1
- 229920005862 polyol Polymers 0.000 abstract 1
- 150000003077 polyols Chemical class 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 42
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 36
- 229910052757 nitrogen Inorganic materials 0.000 description 18
- 238000006068 polycondensation reaction Methods 0.000 description 13
- 229920000728 polyester Polymers 0.000 description 11
- 241001550224 Apha Species 0.000 description 9
- 238000003756 stirring Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 8
- 239000004814 polyurethane Substances 0.000 description 7
- 238000004321 preservation Methods 0.000 description 7
- 239000011541 reaction mixture Substances 0.000 description 7
- 230000009182 swimming Effects 0.000 description 7
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 6
- 229920002635 polyurethane Polymers 0.000 description 6
- 238000012797 qualification Methods 0.000 description 6
- SVTBMSDMJJWYQN-UHFFFAOYSA-N 2-methylpentane-2,4-diol Chemical compound CC(O)CC(C)(C)O SVTBMSDMJJWYQN-UHFFFAOYSA-N 0.000 description 4
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 4
- WLJVNTCWHIRURA-UHFFFAOYSA-N pimelic acid Chemical compound OC(=O)CCCCCC(O)=O WLJVNTCWHIRURA-UHFFFAOYSA-N 0.000 description 4
- 229910052723 transition metal Inorganic materials 0.000 description 4
- 150000003624 transition metals Chemical class 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 description 2
- 239000012675 alcoholic extract Substances 0.000 description 2
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229940051250 hexylene glycol Drugs 0.000 description 2
- 230000003301 hydrolyzing effect Effects 0.000 description 2
- 239000003863 metallic catalyst Substances 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229920001610 polycaprolactone Polymers 0.000 description 2
- FWPIDFUJEMBDLS-UHFFFAOYSA-L tin(II) chloride dihydrate Chemical compound O.O.Cl[Sn]Cl FWPIDFUJEMBDLS-UHFFFAOYSA-L 0.000 description 2
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- VSCBATMPTLKTOV-UHFFFAOYSA-N 2-tert-butylimino-n,n-diethyl-1,3-dimethyl-1,3,2$l^{5}-diazaphosphinan-2-amine Chemical compound CCN(CC)P1(=NC(C)(C)C)N(C)CCCN1C VSCBATMPTLKTOV-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
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 206010029350 Neurotoxicity Diseases 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 1
- 206010044221 Toxic encephalopathy Diseases 0.000 description 1
- WNLRTRBMVRJNCN-UHFFFAOYSA-L adipate(2-) Chemical compound [O-]C(=O)CCCCC([O-])=O WNLRTRBMVRJNCN-UHFFFAOYSA-L 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 210000005252 bulbus oculi Anatomy 0.000 description 1
- 150000004651 carbonic acid esters Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 125000004177 diethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- DGXRZJSPDXZJFG-UHFFFAOYSA-N docosanedioic acid Chemical class OC(=O)CCCCCCCCCCCCCCCCCCCCC(O)=O DGXRZJSPDXZJFG-UHFFFAOYSA-N 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 235000021050 feed intake Nutrition 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 210000004400 mucous membrane Anatomy 0.000 description 1
- 230000007135 neurotoxicity Effects 0.000 description 1
- 231100000228 neurotoxicity Toxicity 0.000 description 1
- 150000002822 niobium compounds Chemical class 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 239000004632 polycaprolactone Substances 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004917 polyol method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- DCKVNWZUADLDEH-UHFFFAOYSA-N sec-butyl acetate Chemical compound CCC(C)OC(C)=O DCKVNWZUADLDEH-UHFFFAOYSA-N 0.000 description 1
- CGFYHILWFSGVJS-UHFFFAOYSA-N silicic acid;trioxotungsten Chemical compound O[Si](O)(O)O.O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1.O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1.O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1.O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 CGFYHILWFSGVJS-UHFFFAOYSA-N 0.000 description 1
- 210000003491 skin Anatomy 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/60—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from the reaction of a mixture of hydroxy carboxylic acids, polycarboxylic acids and polyhydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/78—Preparation processes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/91—Polymers modified by chemical after-treatment
- C08G63/914—Polymers modified by chemical after-treatment derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/916—Dicarboxylic acids and dihydroxy compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Polyesters Or Polycarbonates (AREA)
Abstract
Description
Claims (10)
Priority Applications (1)
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CN201810366004.XA CN108546329B (zh) | 2018-04-20 | 2018-04-20 | 一种聚酯多元醇的制备方法 |
Applications Claiming Priority (1)
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CN201810366004.XA CN108546329B (zh) | 2018-04-20 | 2018-04-20 | 一种聚酯多元醇的制备方法 |
Publications (2)
Publication Number | Publication Date |
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CN108546329A true CN108546329A (zh) | 2018-09-18 |
CN108546329B CN108546329B (zh) | 2020-07-10 |
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Family Applications (1)
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CN201810366004.XA Active CN108546329B (zh) | 2018-04-20 | 2018-04-20 | 一种聚酯多元醇的制备方法 |
Country Status (1)
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CN (1) | CN108546329B (zh) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112812724A (zh) * | 2020-12-31 | 2021-05-18 | 苏州赛伍应用技术股份有限公司 | 一种聚酯胶黏剂及其制备方法 |
CN114163167A (zh) * | 2021-12-30 | 2022-03-11 | 北京中科嘉固科技有限公司 | 结构快速修复用超强高韧性聚酯混凝土、制备方法和应用 |
CN117603047A (zh) * | 2024-01-23 | 2024-02-27 | 中建安装集团有限公司 | 一种生物基多元醇的制备方法和应用 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102245673A (zh) * | 2008-12-12 | 2011-11-16 | 道达尔石油化学产品研究弗吕公司 | 制备二嵌段和多嵌段共聚物的方法 |
CN102786672A (zh) * | 2012-08-29 | 2012-11-21 | 中国科学院长春应用化学研究所 | 一种聚乳酸嵌段共聚物的制备方法 |
-
2018
- 2018-04-20 CN CN201810366004.XA patent/CN108546329B/zh active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102245673A (zh) * | 2008-12-12 | 2011-11-16 | 道达尔石油化学产品研究弗吕公司 | 制备二嵌段和多嵌段共聚物的方法 |
CN102786672A (zh) * | 2012-08-29 | 2012-11-21 | 中国科学院长春应用化学研究所 | 一种聚乳酸嵌段共聚物的制备方法 |
Non-Patent Citations (2)
Title |
---|
LEI ZHANG ETC.: "Organocatalytic Stereoselective Ring-Opening Polymerization of Lactide with Dimeric Phosphazene Bases", 《J.AM.CHEM.SOC.》 * |
LEI ZHANG ETC.: "Phosphazene Bases: A New Category of Organocatalysts for the Living Ring-Opening Polymerization of Cyclic Esters", 《MACROMOLECULES》 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112812724A (zh) * | 2020-12-31 | 2021-05-18 | 苏州赛伍应用技术股份有限公司 | 一种聚酯胶黏剂及其制备方法 |
CN114163167A (zh) * | 2021-12-30 | 2022-03-11 | 北京中科嘉固科技有限公司 | 结构快速修复用超强高韧性聚酯混凝土、制备方法和应用 |
CN114163167B (zh) * | 2021-12-30 | 2023-01-20 | 北京中科嘉固科技有限公司 | 结构快速修复用超强高韧性聚酯混凝土、制备方法和应用 |
CN117603047A (zh) * | 2024-01-23 | 2024-02-27 | 中建安装集团有限公司 | 一种生物基多元醇的制备方法和应用 |
CN117603047B (zh) * | 2024-01-23 | 2024-06-11 | 中建安装集团有限公司 | 一种生物基多元醇的制备方法和应用 |
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CN108546329B (zh) | 2020-07-10 |
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Inventor after: Kang Peng Inventor after: Meng Jingjing Inventor after: Shi Shengpeng Inventor after: Cai Tao Inventor after: Guo Kai Inventor after: Gao Han Inventor after: Zhu Ning Inventor after: Hu Xin Inventor after: Li Zhenjiang Inventor after: Fang Zheng Inventor before: Guo Kai Inventor before: Gao Han Inventor before: Zhu Ning Inventor before: Hu Xin Inventor before: Li Zhenjiang Inventor before: Fang Zheng Inventor before: Meng Jingjing |
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Effective date of registration: 20220407 Address after: 100000 22 Chaoyangmen North Street, Chaoyang District, Beijing. Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Address before: 210000 Puzhu South Road, Pukou District, Nanjing, Jiangsu 30 Patentee before: Nanjing Tech University |
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