Method for improving the yield of heavy hydrocarbons in a thermal cracking process
First Claim
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1. A method comprising the steps of:
- (a) contacting a tube of a cracking furnace with a composition having C5+ production enhancing properties containing tetrabutyltin and hexamethyldisiloxane to thereby provide a treated tube wherein said composition has a molar ratio of tetrabutyltin to hexamethyldisiloxane in the range of from about 1;
10 to about 10;
1;
(b) charging a saturated hydrocarbon stream to said treated cracking tube operated under suitable conditions for cracking said saturated hydrocarbon stream;
(c) producing a product stream having a concentration of hydrocarbon compounds having at least five carbon atoms greater than that of said product stream when the treatment of step (a) is not performed; and
(d) recovering at least a portion of said concentration of hydrocarbon compounds having at least five carbon atoms.
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Abstract
The incremental yield of hydrocarbons having five or more carbon atoms in a cracked product from a thermal cracking process is increased by contacting or treating the tubes of a thermal cracking furnace with a composition comprising tin and silicon.
15 Citations
23 Claims
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1. A method comprising the steps of:
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(a) contacting a tube of a cracking furnace with a composition having C5+ production enhancing properties containing tetrabutyltin and hexamethyldisiloxane to thereby provide a treated tube wherein said composition has a molar ratio of tetrabutyltin to hexamethyldisiloxane in the range of from about 1;
10 to about 10;
1;
(b) charging a saturated hydrocarbon stream to said treated cracking tube operated under suitable conditions for cracking said saturated hydrocarbon stream;
(c) producing a product stream having a concentration of hydrocarbon compounds having at least five carbon atoms greater than that of said product stream when the treatment of step (a) is not performed; and
(d) recovering at least a portion of said concentration of hydrocarbon compounds having at least five carbon atoms. - View Dependent Claims (2, 3, 4, 5)
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6. A method for incrementally increasing the yield of C5+ in a product stream produced by a thermal cracking process for cracking a saturated hydrocarbon stream, said method comprises the steps of:
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(a) contacting a tube of said cracking furnace with a composition containing tetrabutyltin and hexamethyldisoloxane to thereby provide a treated tube wherein said composition has a molar ratio of tetrabutyltin to hexamethyldisiloxane in the range of from about 1;
10 to about 10;
1;
(b) thereafter, charging said saturated hydrocarbon stream to said treated tube which is operated under cracking conditions; and
(c) providing said product stream from said treated tube having a C5+ concentration greater than that of said product stream produced by said tube when said tube is utilized under similar cracking conditions to those of said treated tube and without the treatment of step (a); and
recovering the incremental increase in production of C5+ resulting from the use of said treated tube. - View Dependent Claims (7, 8, 9, 10)
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11. A method for incrementally improving the yield of hydrocarbon compounds having at least five carbon atoms in a product stream produced by a thermal cracking process for cracking under suitable cracking conditions a hydrocarbon stream, said method comprising the steps of:
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(a) adding a composition containing tetrabutyltin and hexamethyldisiloxane to said hydrocarbon stream in an amount effective for enhancing the production of hydrocarbons having at least five carbon atoms when said hydrocarbon stream undergoes cracking under said suitable cracking conditions and wherein the molar ratio of tetrabutyltin and hexamethyldisiloxane is in the range of from about 1;
10 to about 10;
1;
(b) subjecting said hydrocarbon stream containing said composition to said suitable cracking conditions;
(c) incrementally increasing the yield of hydrocarbons having at least five carbon atoms above the yield of such hydrocarbons produced when adding step (a) is not performed; and
(d) recovering a portion of the incremental yield of said hydrocarbons having at least five carbon atoms. - View Dependent Claims (12, 13, 14)
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15. A method for incrementally increasing the yield of C5+ and incrementally decreasing the yield of acetylene in a product stream produced by a thermal cracking process for cracking a saturated hydrocarbon stream, said method comprises the steps of:
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(a) contacting a tube of said cracking furnace with a composition containing tetrabutyltin and hexamethyldisiloxane to thereby provide a treated tube wherein said composition has a molar ratio of tetrabutyltin to hexamethyldisiloxane in the range of from about 1;
10 to about 10;
1;
(b) thereafter, charging said saturated hydrocarbon stream to said treated tube which is operated under cracking conditions;
(c) providing said product stream from said treated tube having a C5+ concentration greater than and an acetylene concentration less than that of said product stream produced by said tube when said tube is utilized under similar cracking conditions to those of said treated tube and without the treatment of step (a); and
recovering the incremental increase in production of C5+ resulting from the use of said treated tube; and
(d) recovering the incremental increase in production of C5+ resulting from the use of said treated tube. - View Dependent Claims (16, 17, 18, 19)
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20. A method for incrementally increasing the yield of hydrocarbon compounds having at least five carbon atoms and incrementally decreasing the yield of acetylene in a product stream produced by a thermal cracking process for cracking under suitable cracking conditions a hydrocarbon stream, said method comprising-the steps of:
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(a) adding a composition containing tetrabutyltin and hexamethyldisiloxane and having a molar ratio of tetrabutyltin to hexamethyldisiloxane in the range of from about 1;
10 to about 10;
1 to said hydrocarbon stream and in such an amount effective for enhancing the production of hydrocarbons having at least five carbon atoms and decreasing the production of acetylene when said hydrocarbon stream undergoes cracking under said suitable cracking conditions;
(b) subjecting said hydrocarbon stream containing said composition to said suitable cracking conditions;
(c) incrementally increasing the yield of hydrocarbons having at least five carbon atoms above the yield of such hydrocarbons produced when adding step (a) is not performed; and
(d) recovering a portion of the incremental yield of said hydrocarbons having at least five carbon atoms. - View Dependent Claims (21, 22, 23)
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Specification