Mineral oils: processes and products – Chemical conversion of hydrocarbons – Plural serial stages of chemical conversion
Patent
1987-05-27
1988-06-07
Sneed, Helen M. S.
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Plural serial stages of chemical conversion
208 75, 208 49, 208DIG1, 422109, 422110, 196132, 196134, 165 35, C10G 5102, G05D 1100
Patent
active
047494697
ABSTRACT:
A temperature control process is disclosed for a hydrocarbon conversion process wherein a feedstock is heated in a furnace and is partly converting in a first reactor, the effluent from the first reactor is cooled in a first heat exchanger and by adding a quench, then the cooled effluent is converted in a second reactor, and the effluent from the second reactor is cooled in a second heat exchanger. Part of the pre-furnace feedstock is used as coolant for the two heat exchangers, the amount of coolant being controlled by a first bypass valve for a line bypassing both heat exchangers and by a second bypass valve for a line bypassing only the second heat exchanger. The inlet temperature for the second reactor is controlled while maximizing the pre-furnace feedstock temperature by adjusting the valve for quench and the two bypass valves. To raise the inlet temperature, the second bypass valve is substantially closed before closing the quench valve, and the quench valve is substantially closed before opening the first bypass valve. To lower the inlet temperature, the first bypass valve is substantially closed before opening the quench valve, and the quench valve is substantially opened before opening the second bypass valve.
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Caldarola Glenn
Chevron Research Company
Keeling E. J.
La Paglia S. R.
Schaal E. A.
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