公开(公告)号：US5189209A

公开(公告)日：1993-02-23

申请号：US701853

申请日：1991-05-17

申请人： Tazuo Ohta ,  Kazuo Tanaka ,  Fumio Ohgoshi ,  Terumasa Yoshida ,  Ichihei Motoyama

发明人： Tazuo Ohta ,  Kazuo Tanaka ,  Fumio Ohgoshi ,  Terumasa Yoshida ,  Ichihei Motoyama

IPC分类号： B01J23/40 ,  C07B61/00 ,  C07C51/265 ,  C07C51/43 ,  C07C51/47 ,  C07C51/487 ,  C07C63/24

CPC分类号： C07C51/487

摘要： A process for producing highly pure isophthalic acid which comprises (a) carrying out liquid phase oxidation of an m-dialkyl benzene with molecular oxygen in an acetic acid solvent in the presence of a heavy metal catalyst to form crude isophthalic acid, (b) contact-treating the resulting crude isophthalic acid with a noble metal catalyst belonging to the Group VIII of the Periodic Table supported by activated carbon in the presence of hydrogen, and then (c) separating the deposited isophthalic acid crystal and (d) filtration-treating the separated mother liquor and (e) recirculating the mother liquor thus treated into the liquid phase oxidation step (a) for reusing as a solvent in step (a) is disclosed.

公开(公告)号：US5905177A

公开(公告)日：1999-05-18

申请号：US616453

申请日：1996-03-15

申请人： Ikuya Seo ,  Terumasa Yoshida

发明人： Ikuya Seo ,  Terumasa Yoshida

IPC分类号： B01J8/04 ,  B01J8/06 ,  C07B61/00 ,  C07C17/156 ,  C07C17/38 ,  C07C19/045 ,  C07C17/15 ,  C07C17/02

CPC分类号： B01J8/067 ,  B01J8/04 ,  B01J8/0457 ,  C07C17/156 ,  B01J2208/00212

摘要： In a method for producing 1,2-dichloroethane by an oxychlorination reaction of ethylene, hydrogen chloride and oxygen, a continuous method for producing 1,2-dichloroethane, which comprises cooling a gas discharged from an oxychlorination reactor to condense and separate 1,2-dichloroethane and water therefrom, further removing hydrogen chloride and carbon dioxide therefrom, then mixing oxygen and nitrogen thereto so that the oxygen concentration becomes from 20 to 30 vol % and the ethylene concentration becomes from 1 to 3 vol % and supplying the gas mixture thus adjusted to an oxychlorination reactor.

摘要翻译： 在通过乙烯，氯化氢和氧气的氧氯化反应制备1,2-二氯乙烷的方法中，制备1,2-二氯乙烷的连续方法，其包括冷却从氯氧化反应器排出的气体以冷凝和分离1,2 二氯乙烷和水，进一步从其中除去氯化氢和二氧化碳，然后将氧和氮混合，使得氧浓度为20〜30体积％，乙烯浓度为1〜3体积％，由此供给气体混合物 调整为氧氯化反应器。

公开(公告)号：US5132450A

公开(公告)日：1992-07-21

申请号：US722555

申请日：1991-06-25

申请人： Kazuo Tanaka ,  Terumasa Yoshida ,  Fumio Okoshi ,  Ichihei Motoyama ,  Tazuo Ohta ,  Toshiaki Abe

发明人： Kazuo Tanaka ,  Terumasa Yoshida ,  Fumio Okoshi ,  Ichihei Motoyama ,  Tazuo Ohta ,  Toshiaki Abe

IPC分类号： B01J27/128 ,  C07C51/265

CPC分类号： B01J27/128 ,  C07C51/265

摘要： A process for producing isophthalic acid by oxidation of m-xylene with an oxygen-containing gas in a hydrous acetic acid solvent in the presence of a cobalt/manganese/bromine system catalyst, the process being capable of industrially advantageously producing high-purity isophthalic acid having excellent whiteness, the process comprising (1) a step of carrying out an oxidation reaction in a main oxidation reactor under specified ranges of a catalyst concentration, a reaction temperature and an oxygen concentration in a discharge gas such that the concentration of 3-carboxybenzaldehyde becomes 500 to 10,000 ppm, (2) a step of further carrying out an oxidation reaction in a post oxidation reactor such that the concentration of 3-carboxybenzaldehyde becomes 100 to 800 ppm, separating crude isophthalic acid, evaporating remaining mother liquor and recovering acetic acid, and (3) mixing the crude isophthalic acid with purified acetic acid, stirring the resultant mixture at 100.degree. C. or higher, and separating purified isophthalic acid.