申请人:OCCIDENTAL CHEMICAL CORPORATION
公开号:EP0127803A1
公开(公告)日:1984-12-12
This invention relates to a process for the preparation a 4-fluorophthalic anhydride which comprises contacting dihalohexahydrophthalic anhydride of the formula
where X is Cl or F, with a dehydrogenation catalyst. Advantageously, the process of the invention may be carried out in the presence of a hydrogen acceptor. The preferred hydrogen acceptor is a halocarbon hydrogen acceptor of the formula
where Y is Cl,Br,or l;Zis Cl,Brorl;mis 0 to 4,nis 0 to 3,pis 0 to 3, and m + n is at least 1; with the proviso that when m is 0, p is at least 1.
本发明涉及一种制备 4-氟邻苯二甲酸酐的工艺,该工艺包括将式如下的二卤代六氢邻苯二甲酸酐与脱氢催化剂接触
式中 X 为 Cl 或 F 的二卤代六氢邻苯二甲酸酐与脱氢催化剂接触。有利的是,本发明的工艺可以在氢受体存在的情况下进行。优选的氢受体是式中的卤代烃氢受体
式中 Y 为 Cl、Br 或 l;Z 为 Cl、Brorl;mis 0 至 4,n 为 0 至 3,p 为 0 至 3,m + n 至少为 1;但当 m 为 0 时,p 至少为 1。