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1. 发明公开

EP1250308A1 PROCESS FOR THE RECOVERY OF PURIFIED TEREPHTHALIC ACID (PTA) 审中-公开
标题翻译：中回收精对苯二甲酸
公开(公告)号：EP1250308A1
公开(公告)日：2002-10-23
申请号：EP00979877.8
申请日：2000-11-30
申请人： Inca International S.P.A.
发明人： PIRAS, Luciano , SCHENA, Sergio , CHIARELLI, Michelle , SORO, Luigi
IPC分类号： C07C51/43 , C07C63/26
CPC分类号： C07C51/43 , C07C51/47 , C07C63/26
摘要： A process for the preparation of purified terephthalic acid which comprises first introducing a liquid slurry containing crystalized terephthalic acid with impurities into a high pressure rotary filter, then filtering the slurry with the high pressure rotary filter and collecting at least some of the solid portion. The filter typically consists of a case, pressurized at process pressure, and a drum covered by a filtering device such as, for example, a cloth or equivalent filtering device, pressurized at a pressure suitably lower than the case. The drum is ideally divided into three zones: first zone, where the mother liquor is removed; second zone, where the solid is washed; third zone, where the excess of washing liquor is removed and the solid is discharged. The solid portion is washed, onto the filter drum, with additional amounts of water. The washed solid portion is then transferred to a letdown zone, which is at a pressure less than the zone in which the solid portion was collected. After the solid portion is transferred into the letdown zone, the connection between the letdown zone and the collection zone is sealed, such that a change of pressure in the letdown zone will not effect the pressure in the collection zone. The pressure of the letdown zone is then gradually reduced and the solid removed. The letdown zone is then pressurized back up so that it is ready to accept additional solid from the rotary filter.

2. 发明公开

EP1409445A2 PROCESS FOR THE RECOVERY OF CRUDE TEREPHTHALIC ACID (CTA) 审中-公开
标题翻译：一种获得RAW对苯二甲酸
公开(公告)号：EP1409445A2
公开(公告)日：2004-04-21
申请号：EP00979871.1
申请日：2000-11-30
申请人： Inca International S.P.A.
发明人： PIRAS, Luciano , SCHENA, Sergio , CHIARELLI, Michelle , SORO, Luigi
IPC分类号： C07C51/42 , C07C51/47 , C07C63/26 , C07C51/43
CPC分类号： C07C51/42 , C07C51/47 , C07C63/26
摘要： The present invention relates to a process for the preparation of crude terephthalic acid which comprises first introducing a slurry containing crystallized terephthalic acid with impurities in an aliphatic carboxylic acid mother liquor into a rotary filter comprising a case and a rotating drum, wherein the rotating drum is subjected to a uniform pressure differential over the entire drum, and the inside of the drum is at a pressure approximately equal to atmospheric pressure or greater, then filtering said slurry; and finally collecting at least some of the solid portion. Other aspects of the invention include continuously adding the original slurry to the rotary filter and washing the solid portion with additional aliphatic carboxylic acid, water or a combination of the two. The solid portion can then be transferred to a reslurry tank which is at the same pressure as the pressure at the point where the solid portion was collected. The present invention also relates to a process for the preparation of crude terephthalic acid which comprises first introducing a slurry containing crystallized terephthalic acid with impurities in an aliphatic carboxylic acid mother liquor into a rotary filter comprising a case and a rotating drum, wherein the rotating drum is subjected to a uniform pressure differential over the entire drum, then filtering said slurry, washing the solid portion with water; and finally collecting at least some of the solid portion. Other aspects of the invention include continuously adding the original slurry to the rotary filter and additional washing with the aliphatic carboxylic acid mother liquor. The inside of the drum can be less than, greater than or approximately equal to atmospheric pressure. The solid portion can then be transferred to a reslurry tank which is at the same pressure as the pressure at the point where the solid portion was collected.

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