CATALYTIC CONVERSION OF METHANOL TO LOW MOLECULAR WEIGHT OLEFINS

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Abstract
Methanol is converted by use of an ion exchanged Chabazite catalyst to ethylene, propylene and propane with yields of 35, 30 and 25%respectively. The presence of water in the feed increases the selectivity towards ethylene. An increase in pressure from one to 27 atmospheres decreases the yield of ethylene while increasing the yields of propylene and propane. Carbon disulfide in the feed at 6000 ppm changes the character of the catalyst from an olefin producing catalyst to a dehydrogenation catalyst. Carbon disulfide in the feed at 2000 ppm, increases the life of the catalyst in producing olefins. Dimethyl ether accelerates the deactivation process in conversion to olefins. The use of a chabazite catalyst as described herein offers an attractive alternative route for producing olefins from coal based methanol.

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