Process for the preparation of methacrylamide from methylmethacrylate
AssigneeCook Paint and Varnish Company
InventorKenneth E. Harwell
Life of this patent
Estimating the term…
Abstract
This invention relates to an improved process for the preparation of methacrylamide by the reaction of methylmethacrylate with a molar excess of aqueous ammonium hydroxide at or near ambient temperatures to provide a high purity and yield of methacrylamide reaction product that is compatible in the preparation of isocyanate resins. Optional surfactants and alkoxide catalysts may be utilized to increase the rate of the reaction of methylmethacrylate with ammonia which may be further fostered by the addition of gaseous ammonia to the aqueous ammonium hydroxidemethylmethacrylate reaction mixture to yield methacrylamide according to the general equation: ##STR1##
Claims2
A process for the preparation of methacrylamide by the reaction of methylmethacrylate and ammonia comprising:
- (a) adding methylmethacrylate and a surfactant to an aqueous solution of ammonium hydroxide wherein said ammonium hydroxide is used in amounts such that a molar excess of ammonium hydroxide is used per mol of methylmethacrylate to form a reaction mixture comprising a methylmethacrylate oil phase and an ammonium hydroxide aqueous phase;
- (b) stirring said reaction mixture and maintaining the same at a temperature in the range of about 10.degree. C. to 50.degree. C. until said oil phase and said aqueous phase become a single phase and the reaction is completed;
- and
- (c) recovering methacrylamide from the resultant single phase reaction mixture comprising ammonia, water, methanol and methacrylamide, ammonia gas being continuously added to said reaction mixture as the reaction proceeds so as to resaturate the reaction mixture with ammonia gas while the reaction proceeds, the recovered methacrylamide being characterized by its compatibility for the preparation of isocyanate resins.
Dependencies are inferred from the claim text.