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公开(公告)号：EP0498591A3
公开(公告)日：1993-01-27
申请号：EP92300888.2
申请日：1992-02-03
IPC分类号： C07C51/487 , C07C51/265 , C07C51/44
CPC分类号： C07C51/44 , C07C51/265 , C07C51/487 , Y02P20/52 , C07C63/26
摘要： Terephthalic acid is produced by oxidation of para xylene, purified in an aqueous phase and recovered by precipitating a purified product from the aqueous phase, the aqueous phase mother liquor is then cooled or evaporated to produce a further less pure precipitate and a second mother liquor and the less pure precipitate is returned to the reaction medium and/or the water of the second mother liquor is used to dissolve the crude solid and/or the second mother liquor is treated to recover water which is used to wash the precipitate recovered from the aqueous solution. The process produces better yields of terephthalic acid, reduces the use of water and reduces problems in the disposal of polluted waste water.
摘要翻译： 对苯二甲酸通过对二甲苯的氧化生成，在水相中纯化并通过从水相中沉淀纯化产物而回收，然后将水相母液冷却或蒸发以产生更不纯的沉淀物和第二母液，和 将不太纯的沉淀返回到反应介质中和/或使用第二母液的水溶解粗固体和/或处理第二母液以回收水，所述水用于洗涤从水性介质中回收的沉淀 解。 该工艺可以提高对苯二甲酸的收率，减少水的使用并减少处理污染废水的问题。
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公开(公告)号：EP0754673A1
公开(公告)日：1997-01-22
申请号：EP96115916.7
申请日：1992-02-02
IPC分类号： C07C63/26 , C07C51/265 , C07C51/42
CPC分类号： C07C51/42 , C07C51/265 , C07C51/43 , C07C51/487 , Y02P20/52 , C07C63/26
摘要： A terephthalic acid slurry in acetic acid is produced by oxidising p-xylene in acetic acid, removing water by evaporation of a stream of water and acetic acid, and returning acetic acid to the oxidation step. The terephthalic acid is separated from the reaction medium in a first zone to leave a deposit on a band, the deposit is washed with a first aqueous medium in a second zone, removed from the band in a third zone, and admixed with a second aqueous medium. Reaction medium is passed from the first zone to the oxidation step and terephthalic acid is recovered, preferably after further purification.
摘要翻译： 乙酸中的对苯二甲酸浆料是通过在乙酸中氧化对二甲苯，通过蒸发水和乙酸流而除去水，并将乙酸返回到氧化步骤来生产的。 对苯二甲酸在第一区与反应介质分离，在带上留下沉积物，沉积物在第二区用第一含水介质洗涤，在第三区从带中除去，并与第二含水物 中。 将反应介质从第一区域传送至氧化步骤，并且优选在进一步纯化之后回收对苯二甲酸。
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公开(公告)号：EP0498591B1
公开(公告)日：1995-04-12
申请号：EP92300888.2
申请日：1992-02-03
IPC分类号： C07C51/487 , C07C51/265 , C07C51/44
CPC分类号： C07C51/44 , C07C51/265 , C07C51/487 , Y02P20/52 , C07C63/26
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公开(公告)号：EP0722927A1
公开(公告)日：1996-07-24
申请号：EP96105413.7
申请日：1992-02-20
IPC分类号： C07C63/26 , C07C51/265 , C07C51/42
CPC分类号： C07C51/42 , C07C51/265 , C07C51/43 , C07C51/487 , Y02P20/52 , C07C63/26
摘要： A terephthalic acid slurry in acetic acid is produced by oxidising p-xylene in acetic acid, removing water by evaporation of a stream of water and acetic acid, and returning acetic acid to the oxidation step. The terephthalic acid is separated from the reaction medium in a first zone to leave a deposit on a band, the deposit is washed with a first aqueous medium in a second zone, removed from the band in a third zone, and admixed with a second aqueous medium. Reaction medium is passed from the first zone to the oxidation step and terephthalic acid is recovered, preferably after further purification.
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5.发明公开
公开(公告)号：EP0498591A2
公开(公告)日：1992-08-12
申请号：EP92300888.2
申请日：1992-02-03
IPC分类号： C07C51/487 , C07C51/265 , C07C51/44
CPC分类号： C07C51/44 , C07C51/265 , C07C51/487 , Y02P20/52 , C07C63/26
摘要： Terephthalic acid is produced by oxidation of para xylene, purified in an aqueous phase and recovered by precipitating a purified product from the aqueous phase, the aqueous phase mother liquor is then cooled or evaporated to produce a further less pure precipitate and a second mother liquor and the less pure precipitate is returned to the reaction medium and/or the water of the second mother liquor is used to dissolve the crude solid and/or the second mother liquor is treated to recover water which is used to wash the precipitate recovered from the aqueous solution. The process produces better yields of terephthalic acid, reduces the use of water and reduces problems in the disposal of polluted waste water.
摘要翻译： 对苯二甲酸是通过对二甲苯的氧化产生的，在水相中纯化并通过从水相中沉淀纯化产物回收，然后将水相母液冷却或蒸发以产生另外较不纯的沉淀和第二母液， 将较不纯的沉淀物返回到反应介质和/或第二母液的水中以溶解粗固体，和/或处理第二母液以回收用于洗涤从水溶液中回收的沉淀物的水 解。 该方法产生较好的对苯二甲酸二酯产率，减少了水的使用，并减少了处理污水废水的问题。
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