公开(公告)号：US3821292A

公开(公告)日：1974-06-28

申请号：US11660571

申请日：1971-02-18

Applicant: DYNAMIT NOBEL AG

Inventor： HULSMANN H ,  RENCKHOFF G

IPC: C07C63/08 ,  C07C51/09 ,  C07C51/41 ,  C07C63/06

CPC classification number: C07C51/412 ,  C07C63/08

Abstract: The present disclosure is directed to a process for the preparation of substantially pure sodium benzoate which comprises treating commercial grade methyl benzoate with acidic bleaching clay, of the montmorillonite type fractionally distilling the methyl benzoate to obtain a constant boiling-point, substantially pure fraction of methyl benzoate and saponifying the mixture with sodium hydroxide to obtain substantially pure sodium benzoate.

公开(公告)号：US3833643A

公开(公告)日：1974-09-03

申请号：US23011672

申请日：1972-02-28

Applicant: DYNAMIT NOBEL AG

Inventor： HULSMANN H ,  RENCKHOFF G

IPC: C07C69/80 ,  C07C69/82

CPC classification number: C07C69/80

Abstract: A PROCESS FOR THE PRODUCTION OF ARYL ESTERS OF POLYCARBOXYLIC ACIDS SUCH AS ISOPHATHALIC AND TEREPTHALIC ACID IS DISCLOSED WHICH IS AN IMPROVEMENT IN THE PROCESS DISCLOSED IN U.S. PATENT 3,471,549. THE IMPROVEMENT OF THE SUBJECT PROCESS INVOLVES THE ADDITION OF A CARBONIC ACID DIARYL ESTER IN PLACE OF THE LOWER FATTY ACID ANHYDRIDE USED IN THE PROCESS OF THE PATENT. THE CARBONIC ACID DIARYL ESTER IS ADDED IN AN AMOUNT WHICH IS AT LEAST EQUIVALENT TO THE ALKYL ESTER GROUPS STILL PRESENT IN THE REACTION MIXTURE WHICH CONTAINS THE DESIRED ARYL ESTER OF THE POLYCARBOXYLIC ACID.