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US 4,236,219 AGranted
Temperature control of exothermic reactions
AssigneePhillips Petroleum Company
InventorsWilbur N. Killebrew, Jr., Charles M. Stewart
Life of this patent
Estimating the term…
Abstract
In a selective hydrogenation process wherein at least two catalyst beds in series are utilized, the temperature of the feed stream to the first catalyst bed and the temperature of the feed stream from the first catalyst bed to the second catalyst bed are manipulated so as to maintain a desired reaction temperature in both catalyst beds. The desired reaction temperature of the first catalyst bed is manipulated so as to insure that a desired percent of a specific feed component is selectively hydrogenated in the first catalyst bed. The reaction temperature of the second catalyst bed is manipulated so as to maintain a desired concentration of the specific feed component in the product stream from the second catalyst bed.
Claims52
Apparatus comprising:
- a first catalyst bed;
- means for supplying a first feed stream containing a first constituent to said first catalyst bed, a portion of said first constituent in said first feed stream being removed from said first feed stream in said first catalyst bed;
- a second catalyst bed;
- means for withdrawing the reaction effluent from said first catalyst bed as a first product stream and for supplying said first product stream as a second feed stream to said second catalyst bed, a portion of said first constituent in said second feed stream being removed from said second feed stream in said second catalyst bed;
- means for withdrawing the reaction effluent, containing a substantially reduced concentration of said first constituent, from said second catalyst bed as a second product stream;
- means for establishing a first signal representative of the percentage of said first constituent removed from said first feed stream in said first catalyst bed;
- means for establishing a second signal representative of the percentage of said first constituent which is desired to be removed from said first feed stream in said first catalyst bed;
- means for comparing said first signal and said second signal and for establishing a third signal responsive to the difference between said first signal and said second signal;
- means for establishing a fourth signal representative of a prediction of the temperature change for said first feed stream required to compensate for changes in the flow rate of said first feed stream and changes in the concentration of said first constituent in said first feed stream so as to maintain said first signal substantially equal to said second signal;
- means for combining said third signal and said fourth signal to establish a fifth signal representative of the temperature of said first feed stream required to maintain said first signal substantially equal to said second signal;
- and
- means for manipulating the temperature of said first feed stream in response to said fifth signal.
9 more elements
A method for removing a first constituent in a feed stream comprising the steps of:
- supplying a first feed stream containing said first constituent to a first reaction zone, a portion of said first constituent in said first feed stream being removed from said first feed stream in said first reaction zone;
- withdrawing the reaction effluent from said first reaction zone as a first product stream and supplying said first product stream as a second feed stream to said second reaction zone, a portion of said first constituent in said second feed stream being removed from said second feed stream in said second reaction zone;
- withdrawing the reaction effluent, containing a substantially reduced concentration of said first constituent, from said second reaction zone as a second product stream;
- establishing a first signal representative of the percentage of said first constituent removed from said first feed stream in said first reaction zone;
- establishing a second signal representative of the percentage of said first constituent which is desired to be removed from said first feed stream in said first reaction zone;
- comparing said first signal and said second signal and establishing a third signal responsive to the difference between said first signal and said second signal;
- establishing a fourth signal representative of a prediction of the temperature change for said first feed stream required to compensate for changes in the flow rate of said first feed stream and changes in the concentration of said first constituent in said first feed stream so as to maintain said first signal substantially equal to said second signal;
- combining said third signal and said fourth signal to establish a fifth signal representative of the temperature of said first feed stream required to maintain said first signal substantially equal to said second signal;
- and
- manipulating the temperature of said first feed stream in response to said fifth signal.
7 more elements
Apparatus comprising:
- a first catalyst bed;
- means for supplying a first feed stream containing a first constituent to said first catalyst bed, a portion of said first constituent in said first feed stream being removed from said first feed stream in said first catalyst bed;
- a second catalyst bed;
- means for withdrawing the reaction effluent from said first catalyst bed as a first product stream and for supplying said first product stream as a second feed stream to said second catalyst bed, a portion of said first constituent in said second feed stream being removed from said second feed stream in said second catalyst bed;
- means for withdrawing the reaction effluent, containing a substantially reduced concentration of said first constituent, from said second catalyst bed as a second product stream;
- means for establishing a first signal representative of the concentration of said first constituent in said second product stream;
- means for establishing a second signal representative of the desired concentration of said first constituent in said second product stream;
- means for comparing said first signal and said second signal and for establishing a third signal responsive to the difference between said first signal and said second signal;
- means for establishing a fourth signal representative of a prediction of a temperature change for said second feed stream required to compensate for changes in the flow rate of said first feed stream and changes in the concentration of said first constituent in said first feed stream so as to maintain said first signal substantially equal to or less than said second signal;
- means for combining said third signal and said fourth signal to establish a fifth signal representative of the temperature of said second feed stream required to maintain said first signal substantially equal to or less than said second signal;
- and
- means for manipulating the temperature of said second feed stream in response to said fifth signal.
9 more elements
A method for removing a first constituent in a feed stream comprising the steps of:
- supplying a first feed stream containing said first constituent to a first reaction zone, a portion of said first constituent in said first feed stream being removed from said first feed stream in said first reaction zone;
- withdrawing the reaction effluent from said first reaction zone as a first product stream and supplying said first product stream as a second feed stream to a second reaction zone, a portion of said first constituent in said second feed stream being removed from said second feed stream in said second reaction zone;
- withdrawing the reaction effluent, containing a substantially reduced concentration of said first constituent, from said second reaction zone as a second product stream;
- establishing a first signal representative of the concentration of said first consituent in said second product stream;
- establishing a second signal representative of the desired concentration of said first constituent in said second product stream;
- comparing said first signal and said second signal and establishing a third signal responsive to the difference between said first signal and said second signal;
- establishing a fourth signal representative of a prediction of a temperature change for said second feed stream required to compensate for changes in the flow rate of said first feed stream and changes in the concentration of said first constituent in said first feed stream so as to maintain said first signal substantially equal to or less than said second signal;
- combining said third signal and said fourth signal to establish a fifth signal representative of the temperature of said second feed stream required to maintain said first signal substantially equal to or less than said second signal;
- and
- manipulating the temperature of said second feed stream in response to said fifth signal.
7 more elements
Dependencies are inferred from the claim text.