专利名称：METHOD AND APPARATUS FOR PREPARING PURIFIED TEREPHTHALIC ACID
发明人：LEE, Fu-Ming,LAMSHING, Wiston
申请号：US1997022203
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申请日：19971203
空余
公开号：WO98/024749P1
中国历史朝代表公开日：华尔街纪录片
19980611单双眼皮
人忧天
专利内容由知识产权出版社提供
摘要：A method and apparatus for purifying crude terephthalic acid from a liquid dispersion thereof also containing impurities lected from unreacted starting materials, solvents, products of side reactions and/or other undesired materials is provided. The method compris the steps of filtering the dispersion to form a crude terephthalic acid filter cake, dissolving the filter cake in a lective crystallization solvent at an elevated temperature to form a solution, crystallizing purified terephthalic acid from the solution in the crystallization solvent by reducing the pressure and temperature of the solution, and parating the crytallized purified terephthalic acid from the solution. According to the invention, the lective crystallization solvent is non-aqueous, non-corrosive and esntially non-reactive with terephthalic acid. Preferably, the lective crystallization solvent is N-methyl pyrrolidone. The method and apparatus produces purified terephthalic acid having a purity desired for u in forming polyester resin and other products at an economically attractive rate and at operating conditions of reduced verity which require a lower capital investment and simplified processing.
申请人：HFM INTERNATIONAL, INC.
地址：US
国籍：US怎样给文件夹设置密码
荷花的折法代理机构：CANTRELL, Thomas, L.更多信息请下载全文后查看
