申请人:IDEMITSU PETROCHEMICAL CO. LTD.
公开号:EP0296275A1
公开(公告)日:1988-12-28
This invention relates to a carboxylic acid mixture containing at least 55% by weight of isomer mixture of carboxylic acids which are esterified with difficulty with methanol even under such esterification conditions that amount of methanol is 4 times that of carboxylic acid and the esterification reaction is effected in the presence of zinc acetate in an amount of 5.4% by weight of the carboxylic acid as a catalyst at a reaction temperature of 200°C for a reaction time of 5 hours.
It further relates to a process for producing carboxylic acids, characterized by reacting an olefin with carbon monoxide and water in the presence of a catalyst having an acid strength within the range of -9.2∼-6.0 and selected from the group consisting of a catalyst comprising sulfuric acid, a catalyst comprising sulfuric acid and phosphoric acid, a catalyst comprising boron trifluoride and water, a catalyst comprising sulfuric acid, boron trifluoride and water, a catalyst comprising phosphoric acid, boron trifluoride and water, catalyst comprising sulfuric acid and metal compound, the catalyst comprising sulfuric acid, phosphoric acid and metal compound, the catalyst comprising boron trifluoride, water and metal compound, the catalyst comprising sulfuric acid, boron trifluoride, water and metal compound, the catalyst comprising sulfuric acid, phosphoric acid, boron trifluoride, water and metal compound, and the catalyst comprising phosphoric acid, boron trifluoride, water and metal compound under pressure of 2-40 kg/cm².
本发明涉及一种
羧酸混合物,该混合物含有至少 55%(按重量计)的
羧酸异构体混合物,即使在这样的酯化条件下,即
甲醇的量是
羧酸的 4 倍,酯化反应也很难与
甲醇酯化,酯化反应是在
乙酸锌的存在下进行的,
乙酸锌的量为
羧酸重量的 5.4%,作为催化剂,反应温度为 200℃,反应时间为 5 小时。
本发明还涉及一种生产
羧酸的工艺,其特征是在酸强度在-9.2∼-6.0范围内的催化剂存在下,使烯烃与
一氧化碳和
水反应。0 的催化剂、由
硫酸和
磷酸组成的催化剂、由
三氟化硼和
水组成的催化剂、由
硫酸、
三氟化硼和
水组成的催化剂、由
磷酸、
三氟化硼和
水组成的催化剂、由
硫酸和
金属化合物组成的催化剂、由
硫酸在 2-40 kg/cm² 的压力下,由
硫酸、
磷酸和
金属化合物组成的催化剂,由
三氟化硼、
水和
金属化合物组成的催化剂,由
硫酸、
三氟化硼、
水和
金属化合物组成的催化剂,由
硫酸、
磷酸、
三氟化硼、
水和
金属化合物组成的催化剂,以及由
磷酸、
三氟化硼、
水和
金属化合物组成的催化剂。