| 摘要 |
Ethylene cyanohydrin is produced by bringing ethylene oxide together with hydrocyanic acid into contact with a heated aqueous suspension of magnesium oxide, magnesium hydroxide, or magnesium cyanide. It is preferred to add the ethylene oxide and hydrocyanic acid in substantially equimolar proportions and to pass them into an agitated aqueous slurry of the catalyst maintained at 40 DEG to 100 DEG C., and preferably at 50 DEG to 80 DEG C., the mixture being held at the desired temperature for about one hour after the addition of the reactants in order to complete the reaction. Carbon dioxide is then passed in until a pH of about seven is reached and the mixture then boiled so as to convert the magnesium bicarbonate into the insoluble carbonate which is filtered off after cooling the suspension. Ethylene cyanohydrin is obtained from the filtrate after removing the water by evaporation under reduced pressure. In examples, a mixture of ethylene oxide and hydrocyanic acid is fed into a heated aqueous suspension of magnesium hydroxide in a vessel fitted with a condenser or into a similar heated suspension of magnesium hydroxide, or a heated aqueous suspension of magnesium oxide in a closed vessel, the ethylene cyanohydrin being separated as above. Specification 348,134 is referred to. |
