Two-stage process for making trimethyl pyridine
AssigneeThe Dow Chemical Company
InventorsLoren L. Swearingen, Randy J. LaTulip
Life of this patent
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Abstract
Process for the production of 2,4,6-trimethyl pyridine wherein a carbonyl compound such as acetone is reacted with ammonia in the presence of a condensation catalyst at a temperature in the range from 100.degree. to 200.degree. C. to produce a mixture of products containing 2,2,4,6-tetramethyl-1,2-dihydropyridine which is then purified. The substantially pure dihydropyridine is then contacted with a cracking catalyst at a temperature in the range from 250.degree. to 450.degree. C. to produce 2,4,6-trimethyl pyridine in high yield.
Claims6
A method for the preparation of 2,4,6-trimethyl pyridine (TMP) in high yields which comprises
- (A) reacting a carbonyl compound with ammonia in the presence of a condensation catalyst at a temperature in the range from about 100.degree. to about 200.degree. C. and using a suitable mole ratio of reactants, pressure range, and space velocity range to form a mixture containing a high 2,2,4,6-tetramethyl-1,2-dihydropyridine content;
- (B) recovering said dihydropyridine in a substantially purified form;
- (C) contacting said purified dihydropyridine with a cracking catalyst in the presence of a molar excess of a gaseous diluent at a temperature in the range from about 250.degree. to about 450.degree. C., and with a suitable space velocity and pressure range to prepare a mixture containing a high TMP content;
- and
- (D) recovering TMP from said mixture.
Dependencies are inferred from the claim text.