Building to handle more residuum

This paper describes the heavy oil upgrading projects which had been designed for residuum hydrotreating followed by delayed coking. It is demonstrated that combining residuum hydrotreating with delayed coking gives a refinery the flexibility to meet its light product demand while processing heavier crudes. Based on this processing scheme, the Chevron U.S.A. Pascagoula residuum conversion project will start up in late 1983. The improved catalyst systems developed should allow operation at high residuum conversion levels while maintaining reasonable catalyst life. 9 refs.