Accession Number:

AD0723585

Title:

The Effects of Oxygen on the Polymerization of Ethylene in the Presence of Supported Chromium Oxide Catalysis,

Descriptive Note:

Corporate Author:

MASSACHUSETTS UNIV AMHERST SCHOOL OF ENGINEERING

Personal Author(s):

Report Date:

1971-05-01

Pagination or Media Count:

113.0

Abstract:

The polymerization of ethylene over a supported chromium oxide catalyst was studied first in the complete absence of oxygen and then with controlled amounts of oxygen 60 to 600 micro moleg catalyst present. The catalyst was prepared by impregnating a microspheroidal silica-alumina 87 - 13 wt. with a dilute solution of chromic acid. This raw compound was then activated by heating it in vacuo at 550C. The data indicated that the inhibitory effect of oxygen involved the chemisorption of some oxygen containing species which could in time be displaced by an excess of ethylene. A comparison of the molecular weight distributions of the products with the rates of polymerization at shutdown suggested that higher rates of reaction cause local heating within the reactor, thereby increasing local rates of chain transfer and broadening the distribution. Author

Subject Categories:

  • Industrial Chemistry and Chemical Processing

Distribution Statement:

APPROVED FOR PUBLIC RELEASE