[EN] PREPARATION OF 5-AMINOSALICYLIC ACID BY GAS PHASE CATALYTIC CARBOXYLATION<br/>[FR] PRÉPARATION D'ACIDE 5-AMINOSALICYLIQUE PAR CARBOXYLATION CATALYTIQUE EN PHASE GAZEUSE
申请人:ZHEJIANG HUAHAI PHARM CO LTD
公开号:WO2012083753A1
公开(公告)日:2012-06-28
Disclosed is a process for preparing 5-aminosalicylic acid by gas phase catalytic carboxylation, characterized in that carbon dioxide is introduced into a system of p-acetaminophenol and a basic compound at a temperature of 150°C - 220°C and a pressure of 0.5 - 5.0 Mpa in the presence of a catalyst, so as to carry out a gas phase catalytic carboxylation reaction to form a 5-aminosalicylate, and the crude product 5-aminosalicylate is separated, and then acidified to prepare 5-aminosalicylic acid (5-ASA). Since the gas phase catalytic reaction replaces a solid phase thermo-chemical reaction, the reaction is significantly improved in terms of the process flow, reaction conditions, product quality and energy consumption. In addition, the reaction has a short reaction time, good selectivity, high yield and no formation of wastes during the reaction, and is suitable for industrial production.
本发明公开了一种通过气相催化羧化反应制备5-氨基水杨酸的工艺,其特征在于在催化剂的存在下,将二氧化碳引入对乙酰氨基酚和碱性化合物的体系中,在温度为150℃-220℃,压力为0.5-5.0 MPa的条件下进行气相催化羧化反应,形成5-氨基水杨酸盐,然后分离粗品5-氨基水杨酸盐,再进行酸化处理制备5-氨基水杨酸(5-ASA)。由于气相催化反应取代了固相热化学反应,因此在工艺流程、反应条件、产品质量和能耗方面都得到了显著改进。此外,该反应时间短,选择性好,产率高,在反应过程中不会产生废物,适用于工业生产。