By-Products of Ethoxylation of Diethylethanolamine and Its Solutions in Methanol

Abstract

Major products and by-products of the ethoxylation of diethylethanolamine and its solutions in methanol have been identified. Through gas chromatography and mass spectrometry, it has been found that by-products correspond to ethyldiethanolamine and its succeeding ethoxylates. In methanol ethoxylation, diethylethanolamine acts as a catalyst and also itself undergoes ethoxylation, forming two types of products.

REVERSED PHASE HPLC OF OXYETHYLATES OFN-METHYLANILINE ANDN-ETHYLANILINE

“…Our earlier investigations revealed that the tertiary amine catalysts were also exposed to ethoxylation in the reaction mixture after their dealkylation. [1][2][3] The formed by-products are also amines and they keep on providing the catalytic activity for the basic process. In the case when N,N-dimethylaniline (DMA) is employed as a tertiary amine catalyst, the side reactions proceed as follows:…”