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US 6,545,176 B1Granted
Apparatus and process for the high yield production of methyl methacrylate or methacrylic acid
AssigneeRohm and Haas Company
InventorsChorng-Shyuan Tsay, Makarand Dattatraya Phadke, Abraham Benderly, I-Hwa Midey Chang-Mateu, Nicole Rendon Koegel, Heather Granzin Thompson, Diana Elaine Chase
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Abstract
A high yield process for the production of methyl methacrylate or methacrylic acid and an apparatus for increasing the yield in a process for the production of methyl methacrylate or methacrylic acid are disclosed.
Claims15
A process for preparing methyl methacrylate, comprising:
- (A) hydrolyzing acetone cyanohydrin to produce a hydrolysis mixture comprising (α-hydroxyisobutyramide, α-sulfatoisobutyramide, 2-methacrylamide and methacrylic acid;
- (B) feeding said hydrolysis mixture to a cracker reactor, thermally converting said hydrolysis mixture in said cracker reactor to a cracker reactor mixture comprising 2-methacrylamide and methacrylic acid, said cracker reactor being operated under plug flow with the necessary retention time to produce said cracker reactor mixture, withdrawing said cracker reactor mixture from said cracker reactor;
- (C) reacting said cracker reactor mixture in at least one reactor with methanol to form a reaction mixture comprising methyl methacrylate.
A process for preparing methyl methacrylate, comprising:
- (A) hydrolyzing acetone cyanohydrin to produce a hydrolysis mixture comprising α-hydroxyisobutyramide, α-sulfatoisobutyramide, 2-methacrylamide and methacrylic acid;
- (B) providing a thermal conversion apparatus comprising at least one pipe with means for maintaining plug flow;
- (C) feeding said hydrolysis mixture to said thermal conversion apparatus, thermally converting said hydrolysis mixture in said thermal conversion apparatus to a cracker reactor mixture comprising 2-methacrylamide and methacrylic acid, said thermal conversion apparatus being operated under plug flow with the necessary retention time to produce said cracker reactor mixture, withdrawing said cracker reactor mixture from said cracker reactor;
- (D) reacting said cracker reactor mixture in at least one reactor with methanol to form a reaction mixture comprising methyl methacrylate.
1 more element
Dependencies are inferred from the claim text.