Process for obtaining an organic acid from an organic acid ammonium salt, an organic acid amide, or an alkylamine organic acid complex
申请人:——
公开号:US20030029711A1
公开(公告)日:2003-02-13
Disclosed herein are methods for the recovery of an organic acid, such as a heat stable lactic acid, from a feed stream comprising at least one of an organic acid amide, an organic acid ammonium salt, or an alkylamine-organic acid complex. The feed stream that comprises the organic acid amide, organic acid ammonium salt, or alkylamine-organic acid complex is mixed with at least one azeotroping agent. The azeotroping agent is a hydrocarbon capable of forming at least one azeotrope with the organic acid that is produced by the thermal decomposition of the amide, ammonium salt, or complex in the feed stream. Preferably the azeotrope is a heteroazeotrope. The mixture comprising the feed stream and the azeotroping agent is heated to produce a vapor stream that comprises the azeotrope. The vapor stream can be condensed to a liquid stream, and the organic acid is recovered in the liquid stream that is produced. When the azeotrope comprising the organic acid is a heteroazeotrope, the vapor stream can be condensed into a liquid stream, which can be separated into a first phase and a second phase. The first phase contains the highest concentration of organic acid and the second phase comprises azeotroping agent. The organic acid can be further purified and/or concentrated from the separated first phase or from the liquid stream.
本文公开了一种从包含有机酸酰胺、有机酸铵盐或烷基胺-有机酸复合物的进料流中回收有机酸(例如热稳定乳酸)的方法。将含有有机酸酰胺、有机酸铵盐或烷基胺-有机酸复合物的进料流与至少一种共沸剂混合。该共沸剂是一种烃类,能够与在进料流中热分解产生的有机酸形成至少一个共沸物。最好的情况是共沸物是杂共沸物。将混合物加热以产生包含共沸物的蒸汽流。蒸汽流可以冷凝成液流,并在所产生的液流中回收有机酸。当包含有机酸的共沸物是杂共沸物时,蒸汽流可以冷凝成液流,该液流可以分成第一相和第二相。第一相含有最高浓度的有机酸,第二相包含共沸剂。可以从分离的第一相或液流中进一步纯化和/或浓缩有机酸。