| 摘要 |
<p>A process for the polymerization of ethylene or mixtures of ethylene and propene and/or butene-1 by means of a low-pressure catalyst which has been prepared by heating a carrier material in an oxygen-containing stream of gas to high temperatures, which carrier material contains silica and alumina and is impregnated with a chromium compound. The catalyst has been exhaustively extracted with water after its manufacture and then dried and reheated to high temperatures in an oxygen-containing stream of gas. High yields of polymer showing a particularly low content of chromium are obtained.</p> |
