US 4,129,606 AGranted

Temperature control of integrated fractionation column and reaction zone

AssigneeUop LLC

InventorSteve A. Gewartowski

Life of this patent

Estimating the term…

Loading patent…

Abstract

A hydrocarbon stream comprising C.sub.2 to C.sub.8 hydrocarbons is stripped at a high temperature to allow passage of the stripper bottoms stream into a reaction zone without further heating, and the effluent of the reaction zone is then heat exchanged against the feed stream to the stripper column to recover heat. Operation of the reaction zone at the desired temperature is achieved by adjusting the amount of the stripper bottoms stream which is split off for cooling by heat exchange against the feed to the stripper column. The cooled split-off portion is then admixed with the remaining high temperature portion. Adjusting the flow rate of the portion of hot reaction zone effluent which is heat exchanged against the stripper feed stream is performed to control either the temperature of the stripper feed stream or the temperature of the reaction zone effluent as it is passed to a downstream operation.

Claims7

Dependent claims

A method for controlling the temperature of a fractionation column effluent stream as the effluent stream is being passed into a hydrotreating reaction zone and of adjusting the temperature of the hydrotreating reaction zone effluent stream which comprises the steps of:

(a) passing a hydrocarbon feed stream which comprises C.sub.2 to C.sub.8 hydrocarbons into a fractionation column operated at effective fractionation conditions including a bottom temperature above a maximum desired inlet temperature of a downstream hydrotreating reaction zone, and effecting the removal of C.sub.2 to C.sub.5 hydrocarbons from the hydrocarbon feed stream by fraction to thereby produce a fractionation column effluent stream having a first temperature which is above an instantaneous preselected inlet temperature for said reaction zone;
(b) cooling the fractionation column effluent stream to a second temperature by dividing the fractionation column effluent stream into a first portion and a second portion, cooling the second portion by indirect heat exchange against the hydrocarbon feed stream, and then recombining the first portion and the second portion of the fractionation column effluent stream;
(c) measuring the second temperature of the fractionation column effluent stream, and comparing the second temperature to the instantaneous preselected inlet temperature for said reaction zone;
(d) adjusting the relative flow rates of the first portion and the second portion of the fractionation column effluent stream in a manner which changes the second temperature of the fractionation column effluent stream to the instantaneous preselected inlet temperature for said reaction zone;
(e) passing the fractionation column effluent stream through said reaction zone at hydrocarbon conversion conditions to produce a hydrotreating reaction zone effluent stream having a first temperature;
(f) cooling said reaction zone effluent stream to a second temperature by dividing said reaction zone effluent stream into a first portion and a second portion, cooling the second portion by indirect heat exchange against the hydrocarbon feed stream, and then recombining the first portion and the second portion of said reaction zone effluent stream;
(g) measuring the second temperature of said reaction zone effluent stream, and comparing the second temperature to the instantaneous preselected inlet temperature of a downstream unit operation;
and,
(h) adjusting the relative flow rates of the first portion and the second portion of said reaction zone effluent stream in a manner which changes the second temperature of said reaction zone effluent stream to the instantaneous preselected inlet temperature of the downstream unit operation.

6 more elements

A method for controlling the temperature of a fractionation column effluent stream as the effluent stream is being passed into a hydrotreating reaction zone and of adjusting the temperature of the hydrocarbon stream being fed to the fractionator column which comprises the steps of:

(a) measuring the existing temperature of a hydrocarbon feed stream which comprises C.sub.2 to C.sub.8 hydrocarbons as the hydrocarbon feed stream is being passed into a fractionation column operated at effective fractionation conditions including a bottom temperature above a desired inlet temperature of a downstream hydrotreating reaction zone, and effecting the removal of C.sub.2 to C.sub.5 hydrocarbons from the hydrocarbon feed stream by fractionation to thereby produce a fractionation column effluent stream having a first temperature which is above an instantaneous preselected inlet temperature for said hydrotreating reaction zone;
(b) cooling the fractionation column effluent stream to a second temperature by dividing the fractionation column effluent stream into a first portion and a second portion, cooling the second portion by indirect heat exchange against the hydrocarbon feed stream, and then recombining the first portion and the second portion of the fractionation column effluent stream;
(c) measuring the second temperature of the fractionation column effluent stream, and comparing the second temperature to the instantaneous preselected inlet temperature for said reaction zone;
(d) adjusting the relative flow rates of the first portion and the second portion of the fractionation column effluent stream in a manner which changes the second temperature of the fractionation column effluent stream to the instantaneous preselected inlet temperature for said reaction zone;
(e) passing the fractionation column effluent stream through said reaction zone at hydrocarbon conversion conditions to produce a hydrotreating reaction zone effluent stream;
(f) dividing said reaction zone effluent stream into a first portion and a second portion, heat exchanging the second portion against the hydrocarbon feed stream and thereby heating the hydrocarbon feed stream, and then recombining the first portion and the second portion of said reaction zone effluent stream;
(g) comparing the existing temperature of the hydrocarbon feed stream to a preselected inlet temperature for the hydrocarbon feed stream;
and,
(h) adjusting the relative flow rates of the first portion and the second portion of said reaction zone effluent stream in a manner which changes the existing temperature of the hydrocarbon feed stream as determined in step (a) to the preselected inlet temperature of the hydrocarbon feed stream entering the fractionation column.

6 more elements

A method for controlling the temperature of a fractionation column effluent stream as the effluent stream is being passed into an isomerization reaction zone and of adjusting the temperature of an isomerization reaction zone effluent stream which comprises the steps of:

(a) passing a hydrocarbon feed stream which comprises C.sub.2 to C.sub.8 hydrocarbons into a fractionation column operated at effective fractionation conditions including a bottom temperature above a maximum desired inlet temperature of a downstream isomerization reaction zone, and effecting the removal of C.sub.2 to C.sub.5 hydrocarbons from the hydrocarbon feed stream by fractionation to thereby produce a fractionation column effluent stream having a first temperature which is above an instantaneous preselected inlet temperature for said reaction zone;
(b) cooling the fractionation column effluent stream to a second temperature by dividing the fractionation column effluent stream into a first portion and a second portion, cooling the second portion by indirect heat exchange against the hydrocarbon feed stream, and then recombining the first portion and the second portion of the fractionation column effluent stream;
(c) measuring the second temperature of the fractionation column effluent stream, and comparing the second temperature to the instantaneous preselected inlet temperature for said reaction zone;
(d) adjusting the relative flow rates of the first portion and the second portion of the fractionation column effluent stream in a manner which changes the second temperature of the fractionation column effluent stream to the instantaneous preselected inlet temperature for said reaction zone;
(e) passing the fractionation column effluent stream through said reaction zone at hydrocarbon conversion conditions to produce an isomerization reaction zone effluent stream having a first temperature;
(f) cooling said reaction zone effluent stream to a second temperature by dividing said reaction zone effluent stream into a first portion and a second portion, cooling the second portion by indirect heat exchange against the hydrocarbon feed stream, and then recombining the first portion and the second portion of said reaction zone effluent stream;
(g) measuring the second temperature of said reaction zone effluent stream, and comparing the second temperature to the instantaneous preselected inlet temperature of a downstream unit operation;
and,
(h) adjusting the relative flow rates of the first portion and the second portion of said reaction zone effluent stream in a manner which changes the second temperature of said reaction zone effluent stream to the instantaneous preselected inlet temperature of the downstream unit operation.

6 more elements

A method for controlling the temperature of a fractionation column effluent stream as the effluent stream is being passed into an isomerization reaction zone and of adjusting the temperature of the hydrocarbon stream being fed to the fractionator column which comprises the steps of:

(a) measuring the existing temperature of a hydrocarbon feed stream which comprises C.sub.2 to C.sub.8 hydrocarbons as the hydrocarbon feed stream is being passed into a fractionation column operated at effective fractionation conditions including a bottom temperature above a desired inlet temperature of a downstream isomerization reaction zone, and effecting the removal of C.sub.2 to C.sub.5 hydrocarbons from the hydrocarbon feed stream by fractionation to thereby produce a fractionation column effluent stream having a first temperature which is above an instantaneous preselected inlet temperature for said isomerization reaction zone;
(b) cooling the fractionation column effluent stream to a second temperature by dividing the fractionation column effluent stream into a first portion and a second portion, cooling the second portion by indirect heat exchange against the hydrocarbon feed stream, and then recombining the first portion and the second portion of the fractionation column effluent stream;
(c) measuring the second temperature of the fractionation column effluent stream, and comparing the second temperature to the instantaneous preselected inlet temperature for said reaction zone;
(d) adjusting the relative flow rates of the flow portion and the second portion of the fractionation column effluent stream in a manner which changes the second temperature of the fractionation column effluent stream to the instantaneous preselected inlet temperature for said reaction zone;
(e) passing the fractionation column effluent stream through said reaction zone at hydrocarbon conversion conditions to produce an isomerization reaction zone effluent stream;
(f) dividing said reaction zone effluent stream into a first portion and a second portion, heat exchanging the second portion against the hydrocarbon feed stream and thereby heating the hydrocarbon feed stream, and then recombining the first portion and the second portion of said reaction zone effluent stream;
(g) comparing the existing temperature of the hydrocarbon feed stream to a preselected inlet temperature for the hydrocarbon feed stream;
and,
(h) adjusting the relative flow rates of the first portion and the second portion of said reaction zone effluent stream in a manner which changes the existing temperature of the hydrocarbon feed stream as determined in step (a) to the preselected inlet temperature of the hydrocarbon feed stream entering the fractionation column.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/826,909Filed 22 Aug 1977 · continuation in part
Priority: 26 Aug 1976
Granted: 12 Dec 1978
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

C07C 7/04
Purification; Separation; Use of additives: by distillation
B01D 3/4211
Regulation; Control: of columns
C07C 7/005
Purification; Separation; Use of additives: processes comprising at least two steps in series
Y02P 70/10
Climate change mitigation technologies in the production process for final industrial or consumer products: greenhouse gas [GHG] capture, material…

Family

Serial717,978Parent of this continuation-in-part · filed 26 Aug 1976
Serial762,220Parent of this continuation-in-part · filed 24 Jan 1977
US 4,053,367 AParent of this continuation-in-part
US 4,024,026 AParent of this continuation-in-part
US 4,129,606 AThis patent

From the US filing history. Foreign family members aren’t listed.