| 摘要 |
Ethylene is polymerized in the presence of a catalyst comprising an alkali metal disposed on a substantially anhydrous solid support which has a surface area of 25 to 500 or more m.2/gm. and has been promoted by treating with a salt or hydroxide of an alkali metal or alkaline earth metal and subsequently calcining. Polymerization may be effected in an autoclave at 100-200 DEG C., 34-170 atmospheres and the product comprises a slightly branched liquid olefin having 8-18 C associated with high molecular weight solids. Examples IV and V describe the preparation of typical low ethylene polymers.ALSO:A polymerisation catalyst comprises an alkali metal disposed on a substantially anhydrous solid support having a surface area of 25 to 500 or more m2/gm. which has been promoted by treatment with a salt or hydroxide of an alkali or alkaline earth metal and thereafter calcining. All alkali metals (except Fr) are specified. the preferred support are g -Al2O3, SiO2, SiO2-ZrO2 and SiO2-Mgo. Specified promoters are LiOH, NaOH, KOH, CsOH, RbOH, Mg(OH)2, Ca(OH)2, Sr(OH)2, Ba(OH)2, LiNO3, NaNO3, KNO3, CaCO3, MgCO3, Na2CO3, Li2CO3, CH3COOLi and (COONa)2. |
