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US 5,371,273 AGranted
Process for producing methyl methacrylate
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsYoshikazu Shima, Takafumi Abe, Hirofumi Higuchi
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AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsYoshikazu Shima, Takafumi Abe, Hirofumi Higuchi
Estimating the term…
There is disclosed a process for producing methyl methacrylate through gas-phase catalytic reaction of methyl .alpha.-hydroxyisobutyrate which comprises feeding methanol in an amount by weight of 0.1 to 3.0 times the methyl .alpha.-hydroxyisobutyrate in a reactor along therewith and proceeding with the reaction at a reaction temperature in the range of 230.degree. to 300.degree. C. by the use of a transition-type synthetic faujasite zeolite having a specific lattice constant and a specific Na content (Na/Al) as the catalyst. The process is capable of stably producing the objective product having excellent quality in high yield for a long period of time while preventing the problems of early deterioration of the catalyst and coloring of reaction product.
A process for producing methyl methacrylate by a gas-phase catalytic reaction of methyl .alpha.-hydroxyisobutyrate as the starting raw material, which process comprises feeding the methyl .alpha.-hydroxyisobutyrate and methanol, the methanol being in an amount by weight of 0.1 to 3.0 times the amount of the methyl .alpha.-hydroxyisobutyrate, in a reactor at a reaction temperature of 230.degree. to 300.degree. C. in the presence of a catalyst, said catalyst comprising a transition-type synthetic faujasite zeolite having a lattice constant of 24.80 to 24.94 .ANG. and an Na content of 0.9 to 1.02 expressed in terms of Na/Al atomic ratio.
Dependencies are inferred from the claim text.