Utility and hydrogen conservation in hydrogen recycle processes

Details Utility and hydrogen conservation in hydrogen recycle processes Utility and hydrogen conservation in hydrogen recycle processes

1984-10-23

1984-10-23

Atkinson, Charles E.

Boots, shoes, and leggings

364501, 364502, 364156, 208DIG1, G06G 758

Patent

active

044791895

ABSTRACT:
There is disclosed a system for measuring and controlling the concentration of hydrogen in hydrogen-consuming hydrogen recycle processes used in oil refineries and petrochemical plants. The system is intended to reduce utilities and hydrogen usage by means of adjusting vent gas flow and the quantity of hydrogen and hydrocarbon vapor circulating to obtain the operating parameters which yield minimum cost. Specifically there can be a savings of compressor power, fuel required for heating, and hydrogen. The system is dependent on the recognition that a decrease in cooling medium temperature results in an increase in hydrogen flow, which can be decreased to the minimum permissible without endangering catalyst activity and stability and product yield if hydrogen concentration is monitored, that partial pressure is the key parameter, and that it is advantageous to optimize.

REFERENCES:
patent: 3814915 (1974-06-01), Sweeney
patent: 3814916 (1974-06-01), Sweeney
patent: 3972804 (1976-08-01), McLaughlin et al.
patent: 3974064 (1976-08-01), Bajek et al.
Instrumentation Technology, "Computer Control of Severity in Ethylene Cracking Furnaces", R. A. Baxley, Jr., Nov. 1971.
"Optimizing Control of a Chemical Process", Control Engineering, pp. 197-204, Sep. 1957.

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