| 摘要 |
Catalysts for use in the isomerization of alkylene oxides to the corresponding alcohols comprise trilithium phosphate granules containing an excess of Li such that the atomic ratio of Li to P is from 3.06 to 3.7. The catalyst may be suspended in an inert liquid through which the alkylene oxide vapours to be isomerized pass. Examples of suitable liquids are aromatic and aliphatic hydrocarbons of mol. wt. above 120 and their derivatives, e.g. cyclanes, cyclenes, diphenyl oxide, diphenyl benzenes, terphenyls and dodecyl benzenes. Examples using the isomerization of propylene oxide to allyl alcohol are given.ALSO:Trilithium phosphate granules, containing an excess of Li such that the atomic ratio of Li to P is from 3.06 to 3.7, are used as catalysts in the isomerization of alkylene oxides to the corresponding alcohols. The size of the granules may be from 1-100 microns. The catalyst may be prepared by mixing together, in a period of less than 1 min., an aqueous solution of a lithium compound (e.g. hydroxide, nitrate, sulphate, chloride, bromide, iodide, chlorate, perchlorate or acetate) and an aqueous solution of an orthophosphate salt (e.g. Na, K or NH4) or orthophosphoric acid, such that the resulting mixture has a pH of 7-14, and then separating and drying the precipitate obtained. The temperature of the precipitation mixture may be 15-80 DEG C. and the pH of the precipitation mixture may be adjusted by the addition to the solution of the lithium compound of an hydroxide in which the orthophosphate is soluble, e.g. NaOH or KOH. Examples using the catalysts in the isomerization of propylene oxide to allyl alcohol are given.ALSO:Trilithium phosphate granules containing an excess of Li such that the atomic ratio of Li to P is from 3.06 to 3.7 are used as catalysts in the isomerization of alkylene oxides to the corresponding alcohols. The size of the granules may be from 1-100 microns. Examples using the isomerization of propylene oxide to alyl alcohol are given. Conventional preparation of the catalysts 13 is described. |
