0088962-A1 is referenced by 1 patents and cites 4 patents.

1. A process for the preparation of polyethylene glycol carboxylic acids by treating polyethylene glycols or their monomethyl ethers with excess nitric acid in the presence of a vanadium compound as catalyst, at elevated temperature, and working up the reaction mixture by distillation, wherein the reaction mixture, prior to the distillation, is treated with formaldehyde, paraformaldehyde, trioxane or formic acid at a temperature of from 60 to 100 degrees C to decompose the excess nitric acid ; the resulting mixture is heated to a temperature of more than 100 degrees C, while distilling off water without the application of a vacuum ; and the catalyst is separated from the residue with the aid of an acidic ion exchanger.

Title
Process for the preparation of polyethyleneglycolcarboxylic acids.
Application Number
EP19830102128 19830304
Publication Number
0088962 (A1)
Application Date
March 4, 1983
Publication Date
September 21, 1983
Inventor
Hellbach Hans
Eisfeld Wolfgang Dr
Disteldorf Walter Dr
Assignee
Basf
DE
IPC
C07C 59/305
C07C 59/125
C07C 51/487
C07C 51/47
C07C 51/27
C07C 51/42
C07C 51/16
C07C 51/487
C07C 51/47
C07C 51/27
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