Process for the preparation of 3-(methylthio) propanal

Details Process for the preparation of 3-(methylthio) propanal Process for the preparation of 3-(methylthio) propanal

1998-06-22

2000-02-29

Killos, Paul J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Sulfur containing

C07C31900

Patent

active

06031138&

ABSTRACT:
A process for the continuous preparation of 3-(methylthio)propanal. A liquid reaction medium is contacted with a gaseous acrolein feed stream in a gas/liquid contact zone. The reaction medium contains 3-(methylthio)propanal, methyl mercaptan and a catalyst for the reaction between methyl mercaptan and acrolein. The gaseous acrolein feed stream comprises acrolein vapor and non-condensable gas. Acrolein is transferred from the acrolein feed stream to the reaction medium and reacts with methyl mercaptan in that medium to produce a liquid reaction product containing 3-(methylthio)propanal. The non-condensable gas is separated from the liquid reaction product. The reaction product is divided into a product fraction and a circulating fraction, and the circulating fraction is recycled to the gas/liquid contact zone.

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