Claims
- 1. A combination useful for reducing or preventing coke formation in thermal cracking furnaces, the combination being comprised of(A) one or more compound of the formula R—Sx—R′wherein R & R′ are independently H, alkyl with 1 to 24 carbons straight chain or branched, aryl and x=1 to 5; and(B) one or more compound selected from the following group: B1—a hydroxylamine of the formula: wherein R and R′ are independently H, alkyl with 1 to 24 carbons straight chain or branched, aryl;B2—an alkyl hydrazine of the formula: wherein R and R′ are independently H, alkyl with 1 to 24 carbons straight chain or branched, aryl; andP3—an amine oxide of the formula wherein R is H, alkyl and R′ & R″ are alkyl of 1 to 24 carbon atoms.
- 2. An improved process for producing olefinic materials by the introduction of the combination of claim 1 to a hydrocarbon feed stream to be cracked or to another feed stream prior to either of the streams entering the thermal cracking furnace.
- 3. The blend of claim 1 wherein the compound of A is H2S, methylmercaptan, ethylmercaptan, propylmercaptan, butymercaptan, an aryl mercaptan, dimethyl sulfide, diethyl sulfide, methylethyl sulfide, dimethyl disulfide, diethyl disulfide, methylethyl disulfide, thiophene, an alkylthiophenes, benzothiophene, dibenzothiophene, or a polysulfide.
- 4. The blend of claim 1 wherein the compound of A is an alkyl disulfide.
- 5. The blend of claim 4 the alkyl disulfide is dimethyldisulfide or dimethyl sulfide.
- 6. The blend of claim 1 wherein the compound of Dl is hydroxylamine, monoisopropylhydroxylamine, diethylhydroxylamine, dibutylhydroxylamine; the compound of B2 is hydrazine, methylhydrazine, dimethylhydrazine; and the compound of B3 is triethylamineoxide.
- 7. The blend of claim 6, wherein B is an hydrazine or a hydroxylamine.
- 8. The blend of claim 7 wherein the hydroxyamine is diethylhydroxylamine.
- 9. The blend of claim 1 wherein the concentration of A relative to the hydrocarbon feed stream is from 5 ppm to 1000 ppm, he concentration of B relative to the hydrocarbon feed stream to is from 5 ppm 1000 ppm and the ratios of the A to B components ranges from 1-0.1 (weight-to-weight) to 1-100.
- 10. A combination useful for reducing or preventing coke formation in thermal cracking furnaces, the combination being comprised of(A) at least one of dimethyldisulfide and dimethyl sulfide; and (B) diethylhydroxylamine; wherein both component A and B are present at a concentration relative to the hydrocarbon feed stream of 100-300 ppm and at a ratio to each other ranging from 1-0.1 (weight-to-weight) to 1-100.
REFERENCE TO RELATED APPLICATION
This application claims the benefit of U.S. Provisional Application Serial No. 60/221,304 filed Jul. 28, 2000.
US Referenced Citations (6)
Provisional Applications (1)
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Number |
Date |
Country |
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60/221304 |
Jul 2000 |
US |