公开(公告)号：US3853924A

公开(公告)日：1974-12-10

申请号：US10081770

申请日：1970-12-22

Applicant: STANDARD OIL CO

Inventor： MEYER D ,  JOHNSTON G

IPC: C07C51/42 ,  C07C63/32

CPC classification number: C07C51/42 ,  C07C63/307

Abstract: Enhanced recovery of trimellitic acid from liquid phase oxidation effluent that contains a substantial portion of the acid product as solute in acetic acid solvent by concentrating the effluent by use of heat values in the effluent to precipitate a first crop of acid product, displacing and replacing mother liquor with fresh acetic acid of low water content to a first slurry of 60 to 70 percent solids and 40 to 30 percent liquid, further concentrating displaced effluent mother liquor by removal of 80 to 90 percent of its solvent content, displacing and replacing the remaining 20 to 10 percent of solvent with fresh acetic acid of low water content to a second slurry of 60 to 70 percent solids and 40 to 30 percent liquid, combining and removing solvent from the first and second slurries. Advantageously by the use of those steps heat is not wasted, conventional crystallization is avoided and apparatus is minimized by the practice of that combination of procedural steps. The recovered trimellitic acid product can be converted to its intramolecular anhydride or inter- and intra-bis-anhydride.

Abstract translation: 从液相氧化流出液中增加偏苯三酸的回收率，其中含有大部分酸产物作为溶剂在乙酸溶剂中，通过使用流出物中的热值浓缩流出物，沉淀第一批酸产物，置换和替换母体 将具有低含水量的新鲜乙酸的液体加入到60-70％固体和40-30％液体的第一浆料中，通过除去其80至90％的溶剂含量进一步浓缩排出的流出母液，置换和替换剩余的20 至10％的溶剂，其中含有低含水量的新鲜乙酸溶液至60至70％固体和40至30％液体的第二浆料，从第一和第二浆液中合并和除去溶剂。 有利地，通过使用这些步骤，不浪费热量，避免常规的结晶，并且通过实施该程序步骤的组合来使装置最小化。 回收的偏苯三酸产物可以转化为其分子内酸酐或内部和二 - 双酐。