公开(公告)号：US3681446A

公开(公告)日：1972-08-01

申请号：US3681446D

申请日：1970-04-01

Applicant: VELSICOL CHEMICAL CORP

Inventor： LEDFORD NATHAN DALE

IPC: C07C51/265 ,  C07C63/02

CPC classification number: C07C51/265 ,  C07C63/70

Abstract: This invention discloses a new process for preparing parachlorobenzoic acid from a mixture of ortho- and parachlorotoluene containing at least 10 percent of the para isomer which comprises oxidizing said mixture by means of an oxygen containing gas in a liquid reaction medium consisting of lower monocarboxylic acid, a carboxylic anhydride or mixtures thereof in the presence of an oxidation catalyst and thereafter recovering the precipitated para-chlorobenzoic acid from the reaction mixture.

Abstract translation: 本发明公开了一种从含有至少10％的对位异构体的邻氯和对氯甲苯的混合物中制备对氯苯甲酸的新方法，其包括在液体反应介质中通过含氧气体氧化所述混合物，所述液体反应介质由 低级单羧酸，羧酸酐或其混合物，然后在反应混合物中回收沉淀的对氯苯甲酸。

公开(公告)号：US3624157A

公开(公告)日：1971-11-30

申请号：US3624157D

申请日：1969-12-17

Applicant: VELSICOL CHEMICAL CORP

Inventor： INGWALSON RAYMOND W ,  LEDFORD NATHAN DALE

IPC: C07C45/43 ,  C07C45/80 ,  C07C45/81 ,  C07C47/54

CPC classification number: C07C45/80 ,  C07C45/43 ,  C07C45/81 ,  C07C47/55

Abstract: This invention discloses a process for preparing orthochlorobenzaldehyde which comprises chlorinating the side chains of a mixture of ortho- and para-chlorotoluene containing from about 50 to about 85 percent by weight of the orthoisomer in the liquid phase with chlorine gas until the ratio of orthochlorobenzal chloride to parachlorobenzal chloride in the reaction mixture is at least about 10 to 1 by weight, hydrolyzing the resulting mixture to the corresponding benzaldehyde and benzoic acids and thereafter recovering the orthochlorobenzaldehyde therefrom.