| abstract |
THE METHOD OF THE PRESENT INVENTION PROVIDES AN IMPROVEMENT UPON PRIOR ART METHANOL CARBONYLATION METHODS WHICH SUBSTANTIALLY REDUCES THE PRODUCTION OF CARBONYL IMPURITIES. THE PRODUCTION OF CARBONYL IMPURITIES, PARTICULARLY ACETALDEHYDE, CROTONALDEHYDE, AND 2-ETHYL CROTONALDEHYDE, IN METHANOL CARBONYLATION REACTIONS HAS BEEN FOUND TO DECREASE BY MAINTAINING A PARTIAL PRESSURE OF HYDROGEN BETWEEN ABOUT 4.5 WT% METHYL IODIDE IN THE REACTION MEDIUM DURING THE COURSE OF THE REACTION. |