| 摘要 |
1275171 Lithium phosphate COMPAGNIE FRANCAISE DE RAFFINAGE 22 April 1970 [22 April 1969] 19405/70 Heading C1A [Also in Divisions C2 and C5] Lithium phosphate is prepared by reacting phosphoric acid with lithium hydroxide in amounts such that the ratio of Li : P atoms in the reaction mixture is less than or equal to 3, and preferably between 2À2 and 2À9. A preferred method comprises reacting phosphoric acid and lithium hydroxide solution in amounts such that a solution of LiH 2 PO 4 is obtained, cooling this solution and reacting with further LiOH in an amount such that the ratio Li : P in the reaction mixture is less than or equal to 3. The lithium phosphate may be separated from the solution by precipitation, then after removing the liquid phase, dried and calcined at about 300‹ C. The lithium phosphate may be used as a catalyst for the dehydration of diols and epoxides to dienes (see Division C5). |
