KR940014292A

KR940014292A - Method for producing terephthalic acid

Info

Publication number: KR940014292A
Application number: KR1019920026642A
Authority: KR
Inventors: 이면기; 이종인
Original assignee: 이승동; 주식회사 선경인더스트리
Priority date: 1992-12-30
Filing date: 1992-12-30
Publication date: 1994-07-18
Also published as: KR950009476B1

Abstract

본 발명은 테레프탈산 제조공정중의 반응부산물인 메틸아세테이트(이하 MA)의 생성을 억제하면서 테레프탈산을 제조한는 방법에 관한 것으로, 파라크실렌을 코발트, 망간 및 브롬을 함유하는 촉매의 존재하에서 초산용매 중에서 분자상 산호에 의하여 산화하여 테레프탈산을 연속적으로 제조함에 있어서, MA를 포함하고 있는 반응기의 휘발성분을 초산 분리 공비증류탑에 공급하여 탑저부로 초산을 회수하고 탑정부로 부터는 물과 MA를 회수하여 디켄터에서 물과 공비물 형성을 위해 사용되는 유기용매에 존재하는 MA를 증류탑을 통해 탑정부로 회수하여 반응기로 순환시키는 것을 특징으로 하는 테레프탈산의 제조방법.The present invention relates to a method for producing terephthalic acid while suppressing the production of the reaction product, methyl acetate (hereinafter MA), during the production process of terephthalic acid, wherein paraxylene is prepared in the presence of a catalyst containing cobalt, manganese and bromine In the continuous production of terephthalic acid by oxidation by phase coral, the volatile content of the reactor containing MA is supplied to the acetic acid separation azeotropic distillation column to recover acetic acid at the bottom of the column, and to recover water and MA from the tower. A method for producing terephthalic acid, characterized in that the MA present in the organic solvent used for water and azeotrope formation is recovered to the tower through a distillation column and circulated to the reactor.

이때 증류탑의 온도는 탑저부 80∼100℃, 탑상부 50∼70℃로 유지하여 유기용매의 손실없이 MA를 최대한 회수하고 이를 통하여 디켄터의 유기용매층에 존재하는 MA의 농도를 10중량% 이하로 유지하므로써 공비증류탑의 물제거 효율을 저하시키지 않으면서 반응기로 MA의 순환을 가능케 할수 있다.At this time, the temperature of the distillation column is maintained at the tower bottom of 80 ~ 100 ℃, the top of the tower 50 ~ 70 ℃ to recover the MA without loss of organic solvent as much as possible, through which the concentration of MA in the organic solvent layer of the decanter to 10% by weight or less This allows the circulation of the MA through the reactor without compromising the water removal efficiency of the azeotropic distillation tower.

Description

Method for producing terephthalic acid

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

도면은 본 발명의 실시예에서 사용한 실험장치는 나타내는 도면The figure shows the experimental apparatus used in the Example of this invention.

Claims

In the continuous production of terephthalic acid by oxidizing paraxylene by molecular acidic acid in acetic acid solvent in the presence of a catalyst containing cobalt, manganese, and bromine, the volatile component of the reactor (1) containing MA was subjected to acetic acid separation azeotropic distillation column. (2) to recover the acetic acid to the bottom of the column, and to recover the water and MA from the tower government through the distillation column (4) the MA present in the organic solvent used for the formation of water and azeotrope in the decanter (3) A method for producing terephthalic acid, characterized in that it is recovered to the tower section and circulated to the reactor.

The temperature of the distillation column 4 is maintained at a tower bottom of 80 to 100 ° C. and a tower top of 50 to 70 ° C. to recover MA as much as possible without loss of organic solvent, thereby increasing the concentration of MA in the organic solvent layer of the decanter 3. A method for producing terephthalic acid which allows circulation of MA to a reactor without lowering the water removal efficiency of an azeotropic distillation column by maintaining it at 10 wt% or less.

※ Note: The disclosure is based on the initial application.