[특허]Preparation of cyclohexane dicarboxylic acids

[미국특허] Preparation of cyclohexane dicarboxylic acids 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C07C-061/09
출원번호	US-0544725 (1983-10-24)
발명자 / 주소	Lillwitz Lawrence D. (Glen Ellyn IL)
출원인 / 주소	Amoco Corporation (Chicago IL 02)
인용정보	피인용 횟수 : 26 인용 특허 : 0

초록

Cyclohexane dicarboxylic acids are prepared by hydrogenating phthalic acids in presence of a rhodium catalyst wherein a portion of the product stream is isolated and recycled to the reactor.

대표청구항 ▼

An improved process for preparation of a cyclohexane dicarboxylic acid from a phthalic acid reactant which comprises the steps of (a) hydrogenating said phthalic acid reactant in a polar solvent in the presence of a supported rhodium catalyst at a temperature within the range of 90°C. to 140°C. and a pressure of from 300 to 1800 psig, (b) filtering the catalyst from reactor effluent at a temperature within the range of from 15°C. to 110°C., (c) crystallizing the filtrate at a temperature of from 15°C. to 60°C., (d) the improvement in combination therewith comprising recycling back to the reactor mother liquor containing from about 5 (wt)% to about 25 (wt)% reaction product based on the weight of the phthalic acid reactant. The process of claim 1 wherein said phthalic acid is isophthalic acid, said solvent is water, said supported rodium catalyst is 5 (wt)% rhodium-on-carbon and catalyst:isophthalic acid weight ratio is from about 1:20 to about 1:50. The process of claim 1 wherein said phthalic acid is terephthalic acid, said solvent is ethyl acetate, said supported rhodium catalyst is 5 (wt)% rhodium-oncarbon and catalyst:terephthalic acid weight ratio is from about 1:3 to about 1:5.

이 특허를 인용한 특허 (26) 인용/피인용 타임라인 분석

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Hembre, Robert Thomas; Boppana, Venkata Bharat Ram; Barnicki, Scott Donald; Kirk, Shane Kipley, Processes for making cyclohexane compounds.
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Gaggar,Satish Kumar; de Moor,Johannes Jacobus; Honigfort,Paul; Hoogland,Gabrie; van Heeringen,Mark; van Hamersveld,Eelco M. S., Transparent polycarbonate polyester composition and process.
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Pierre, Jean R.; Vollenberg, Peter H. Th., UV stabilized, impact modified polyester/polycarbonate blends, articles, and methods of manufacture thereof.
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[미국특허] Preparation of cyclohexane dicarboxylic acids 원문보기