公开(公告)号：US5718808A

公开(公告)日：1998-02-17

申请号：US758558

申请日：1996-11-29

Applicant: James J. Baiel ,  Larry O. Jones ,  Ralph D. Gray, Jr. ,  Magdiel Agosto

Inventor： James J. Baiel ,  Larry O. Jones ,  Ralph D. Gray, Jr. ,  Magdiel Agosto

IPC: C07C51/573 ,  C07D307/89

CPC classification number: C07C51/573

Abstract: A process for recovering phthalic anhydride as a liquid from a vapor phase oxidation product which comprises mixing the vapor phase oxidation product having a temperature of about 130.degree. C. or greater with a first stream comprising a solvent having a boiling point in the range between about 150.degree. to 350.degree. C. and a freezing point of less than 40.degree. C., and, optionally, at least one by-product selected from the group consisting of: maleic anhydride, citraconic anhydride, benzoic acid and phthalic anhydride, in a contacting means such that a substantial portion of the phthalic anhydride contained within the vapor phase oxidation product transfers from the vapor phase to a liquid phase and a substantial portion of the first stream which are more volatile than phthalic anhydride transfer from the liquid phase to the vapor phase and wherein a vapor-to-liquid weight ratio in the range between about 2 to 20 is exhibited within the contacting means, thereby forming a liquid phase phthalic anhydride product having a phthalic anhydride concentration in the range between about 50-100 wt. %., preferably 90-100 wt. %, without the formation of an intermediate solid phase.

Abstract translation: 从气相氧化产物中回收邻苯二甲酸酐作为液体的方法，其包括将具有约130℃或更高温度的气相氧化产物与包含沸点在约 150℃至350℃，冰点低于40℃，以及任选地至少一种副产物，其选自马来酸酐，柠康酸酐，苯甲酸和邻苯二甲酸酐，其中 接触方式使得气相氧化产物中所含的邻苯二甲酸酐的相当大部分从汽相转移到液相，并且大部分第一物流比邻苯二甲酸酐从液相转移到蒸汽更易挥发 相，并且其中在接触装置内显示约2-20范围内的气 - 液重量比，从而形成液相邻苯二甲酸 酸酐产物的邻苯二甲酸酐浓度在约50-100wt。 ％，优选90-100wt。 ％，而不形成中​​间固相。