JPS6468342A - Method for separating and purifying 3,4,3',4'-biphenyltetracarboxylic acid tetraester - Google Patents

Method for separating and purifying 3,4,3',4'-biphenyltetracarboxylic acid tetraester

Info

Publication number
JPS6468342A
JPS6468342A JP22617987A JP22617987A JPS6468342A JP S6468342 A JPS6468342 A JP S6468342A JP 22617987 A JP22617987 A JP 22617987A JP 22617987 A JP22617987 A JP 22617987A JP S6468342 A JPS6468342 A JP S6468342A
Authority
JP
Japan
Prior art keywords
line
phthalic acid
acid diester
mixture
unreacted
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
Application number
JP22617987A
Other languages
Japanese (ja)
Other versions
JPH0662508B2 (en
Inventor
Katsuzo Harada
Shinichiro Yamamoto
Akira Ishikawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ube Corp
Original Assignee
Ube Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ube Industries Ltd filed Critical Ube Industries Ltd
Priority to JP62226179A priority Critical patent/JPH0662508B2/en
Publication of JPS6468342A publication Critical patent/JPS6468342A/en
Publication of JPH0662508B2 publication Critical patent/JPH0662508B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

PURPOSE:To advantageously obtain the titled compound which is a raw material monomer for aromatic polyimides, by dimerizing an o-phthalic acid diester and subjecting the resultant reaction product mixture with a specific content or below of the unreacted o-phthalic acid diester available from the dimerization reaction solution to crystallization operation under specific condition. CONSTITUTION:A mixture of products obtained by dimerizing an o-phthalic acid diester is introduced into a thin-film evaporator 12 to distill off the unreacted o-phthalic acid diester from a line 13 and adjust the unreacted raw material in the residual solution to <=1.0wt.%, preferably <=0.5wt.%. The resultant reaction product mixture is then fed from a line 14 to a thin-film evaporator 15 to reduce the content of high-boiling products in the mixture. The obtained mixture is subsequently introduced from a line 16 into a mixer 17 for a crystallizing solvent and mixed with the crystallizing solvent fed from a line 19. The mixed solution is subsequently transferred to a crystallizer 20, selectively crystallized and then centrifuged in a centrifugal separator 21 to afford crystals of the aimed compound from a line 22. The crystallizing operation is preferably carried out at 25-50 deg.C.
JP62226179A 1987-09-09 1987-09-09 Method for separating and purifying 3,4,3 ', 4'-biphenyltetracarboxylic acid tetraester Expired - Lifetime JPH0662508B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62226179A JPH0662508B2 (en) 1987-09-09 1987-09-09 Method for separating and purifying 3,4,3 ', 4'-biphenyltetracarboxylic acid tetraester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62226179A JPH0662508B2 (en) 1987-09-09 1987-09-09 Method for separating and purifying 3,4,3 ', 4'-biphenyltetracarboxylic acid tetraester

Publications (2)

Publication Number Publication Date
JPS6468342A true JPS6468342A (en) 1989-03-14
JPH0662508B2 JPH0662508B2 (en) 1994-08-17

Family

ID=16841122

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62226179A Expired - Lifetime JPH0662508B2 (en) 1987-09-09 1987-09-09 Method for separating and purifying 3,4,3 ', 4'-biphenyltetracarboxylic acid tetraester

Country Status (1)

Country Link
JP (1) JPH0662508B2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6051150A (en) * 1983-08-30 1985-03-22 Ube Ind Ltd Production of biphenyltetracarboxylic acid ester
JPS60102939A (en) * 1983-11-09 1985-06-07 Ube Ind Ltd Recovery and regeneration of palladium salt catalyst

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6051150A (en) * 1983-08-30 1985-03-22 Ube Ind Ltd Production of biphenyltetracarboxylic acid ester
JPS60102939A (en) * 1983-11-09 1985-06-07 Ube Ind Ltd Recovery and regeneration of palladium salt catalyst

Also Published As

Publication number Publication date
JPH0662508B2 (en) 1994-08-17

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