Manufacture of alkyl glyoxylates with ferric phosphate catalyst
OwnerPrakasa R. Anantaneni, Tao P. Liinventors
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Abstract
A process of this invention for producing glyoxylate esters is carried out by contacting a with a catalyst comprising ferric phosphate on an alumina supportfeed composition comprising an oxygen containing gas and a vaporized lower alkyl ester of glycolic acid. The process of the invention can be carried out as either a fixed bed or a fluid bed operation.
Claims16
A process for the preparation of a lower alkyl ester of glyoxylic acid comprising contacting a catalyst, comprising ferric phosphate on a support material selected from the group consisting of alumina and silica containing alumina with a feed composition comprising an oxygen containing gas and a lower alkyl ester of glycolic acid, whereby said ester is oxidized to form the corresponding alkyl glyoxylate ester.
A process as in any one of the preceding claims wherein said feed composition is introduced continuously into a fixed bed reaction zone containing said catalyst.
A process for the preparation of a lower alkyl ester of glyoxylic acid comprising:
- introducing into a reaction zone a feed stream comprising oxygen, an inert gas, and a vapor comprising
- a lower alkyl ester of glycolic acid, wherein the concentration of said ester of glycolic acid is between about 3% and about 20% by volume, the mole ratio of oxygen to said ester being in the range of from about 0.8 to about 6, said reaction zone comprising a fixed bed containing a catalyst, said catalyst comprising between about 6% and about 18% by weight ferric phosphate on an alumina support material having a surface area of between about 0.02 m.sup.2 /g and about 45 m.sup.2 /g;
- reacting the oxygen and glycolic acid ester at a temperature in the range of between about 250.degree. C. and about 400.degree. C. in the presence of said catalyst;
- and
- withdrawing from said reaction zone a product stream comprising said lower alkyl ester of glyoxylic acid.
Dependencies are inferred from the claim text.