PROCESS FOR THE PRODUCTION OF AN ALKENYL CARBOXYLATE OR AN ALKYL CARBOXYLATE

摘要

Process for producing an alkyl carboxylate, comprising contacting in an oxidation reaction zone a C₂ to C₄ alkane, a molecular oxygen-containing gas, the corresponding alkene and optionally water, in the presence of at least one catalyst active for the oxidation of the alkane to the corresponding alkene and carboxylic acid, to produce a first product stream comprising alkene, unreacted alkane, carboxylic acid and water; separating in a first separation means at least a portion of the product stream produced in the oxidation reaction zone into a gaseous stream comprising alkene and unreacted alkane and a liquid stream comprising carboxylic acid and water; and separating by chemical treatment at least a portion of the gaseous stream obtained from the first separation means into respective streams rich in alkene and alkane; wherein the chemical treatment comprises the steps of: (1) contacting the alkene/alkane gaseous stream with a solution of a metal salt capable of selectively chemically absorbing the alkene to produce a chemically absorbed alkene-rich liquid stream, and (2) recovering an alkene rich stream from the metal salt solution. In a second reaction zone, at least a portion of the alkene rich stream obtained from the second separation means and a corresponding carboxylic acid are contacted, in the presence of at least one catalyst active for the production of alkyl carboxylate, to produce a second product stream comprising alkyl carboxylate.