| 摘要 |
<p>1,237,884. Oxidation of olefins. PETROCARBON DEVELOPMENTS Ltd. 19 May, 1969 [20 May, 1968], No. 23937/68. Heading C2C. Propylene oxide is prepared by oxidizing isopropyl alcohol in the liquid phase with oxygen at an elevated temperature and pressure sufficient to maintain the isopropyl alcohol in the liquid phase to produce a product comprising unreacted alcohol, hydrogen peroxide and acetone, removing at least the major part of the acetone from the hydrogen peroxide, replacing the isopropyl alcohol with an ester solvent of formula R-COOR<SP>1</SP>, in which R and R<SP>1</SP> are C 1-5 alkyl groups optionally substituted with at least one electrophilic group, reacting the resulting hydrogen peroxide solution with at least one acid of formula R 1 COOH in which R 1 is hydrogen, phenyl or a C 1 -C 5 alkyl group optionally substituted by at least one electrophilic group, thus producing a percarboxylic acid solution, removing any water present by azeotropic distillation, and reacting the resulting anhdyrous percarboxylic acid solution with propylene to give propylene oxide, with the proviso that when the ester solvent forms an azeotrope with the isopropyl alcohol that azeotrope must have a lower boiling point than the ester solvent and when the ester solvent does not form an azeotrope with isopropyl alcohol the ester solvent must have a higher boiling point than isopropyl alcohol. The process is carried out in the absence of heavy metal ions. The propylene may be used as a mixture with one or more olefins and may be mixed with an inert material. The oxygen may be used as air. The conditions of reaction between the percarboxylic acid solution and propylene may be adjusted so that propylene glycol and a propylene glycol ester may be formed in addition to the propylene oxide.</p> |
