Balancing adiabatic reactors

Details Balancing adiabatic reactors Balancing adiabatic reactors

1974-04-18

1976-02-10

Coughlan, Jr., Paul M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

23515112, 252416, 2606833, C07C 536

Patent

active

039377474

ABSTRACT:
Butadiene is prepared by directing a C.sub.4 hydrocarbon stream through seven parallel adiabatic beds. The dehydrogenation period and the regeneration period are each about 9 1/5 minutes with evacuation and purge taking about 2 3/5 minutes of the 21 minute cycle. The temperature of the regeneration gas is individually adjusted in response to the summation of deviation of targeted conversion from average conversion and reactor deviation from average conversion amongst all reactors. Moreover, such adjustment minimizes deviations of each reactor from average conversion during the previous 21 minute cycle.
The dehydrogenation effluent is mixed and sent through a common quenching zone. The quenched product stream's density varies in response to the extent of conversion, permitting measurement of conversion for each three minutes. Average conversion for each cycle is measured by averaging the conversions for such seven time periods. The density data are directed to a digital computer. the data for each 3 minute period are a composite from four reactors. Deviation from average conversion of each reactor is designated by the computer using the relationships amongst the reactor deviations and the deviations of the 3 minute periods shown in 7 simultaneous equations. The computer controls the increments of the amount of gas supplied to the regeneration gas, thus controlling the temperature of the regeneration gas in response to the summation of such reactor's deviation from average conversion during the 21 minutes prior to the end of its dehydrogenation step, and the deviation of average conversion from targeted conversion for such reactor.

REFERENCES:
patent: 3647909 (1972-03-01), Michaels
patent: 3760168 (1973-09-01), Boyd

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