Method of inhibiting formation of fouling materials during basic washing of hydrocarbons contaminated with oxygen compounds

• US 5,160,425 A
• Filed: 06/21/1991
• Issued: 11/03/1992
• Est. Priority Date: 06/21/1991
• Status: Expired due to Fees

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Nalco Chemical Company (Ecolab, Inc.)
• Inventors: Lewis, Vincent E.
• Primary Examiner(s): Morris, Theodore
• Assistant Examiner(s): HAILEY, PATRICIA L
• Application Number:
  US07/718,623
• Time in Patent Office: 501 Days
• Field of Search: 585/950, 252/403, 252/405, 208/95, 208/48 AA, 208/47
• US Class Current: 208/95
• CPC Class Codes: C10G 19/02 with aqueous alkaline solutions
• CPC Class Codes: C10G 57/00 Treatment of hydrocarbon oils, in the absence of hydrogen, by at least one cracking process or refining process and at least one other conversion process
• CPC Class Codes: C10G 9/16 Preventing or removing incrustation
• CPC Class Codes: Y10S 585/95 Prevention or removal of corrosion or solid deposits

Abstract

A method for inhibiting the formation of fouling materials during the caustic washing of hydrocarbons contaminated with oxygen compounds is disclosed. The method comprises adding an effective amount of carbohydrazide to the caustic wash system.

Claims

1. A method of inhibiting formation of polymeric fouling deposits during the caustic scrubbing of pyrolytically produced hydrocarbons contaminated with oxygen containing compounds with a basic washing solution having a pH >

7 comprising adding to the basic washing solution a sufficient amount for inhibiting formation of polymeric fouling materials of carbohydrazide.

2. The method of claim 1 wherein said hydrocarbon being washed comprises an olefin.

3. The method of claim 2 wherein oxygen containing compounds are composed primarily of carbonyl compounds.

4. The method of claim 3 wherein said carbonyl compounds comprise aldehydes, ketones or mixtures thereof.

5. The method of claim 1 wherein the hydrocarbon being washed is produced by the pyrolytic cracking of hydrocarbon feedstocks.

6. The method of claim 5 wherein said hydrocarbon feedstocks are selected from the group consisting of ethane, propane, butane, naphtha and mixtures thereof.

7. The method of claim 1 wherein the hydrocarbon being washed is in a gaseous phase.

8. A method as recited in claim 3 wherein said carbohydrazide is added to said basic wash in the amount representing a molar ratio of said carbohydrazide to said carbonyl compounds from about 0.5:

1 to about 10;

1.

9. The method of claim 8 wherein said molar ratio is about 1:

1.

10. The method of claim 8 wherein said molar ratio is from about 1:

1 to about 3;

1.

11. A method of inhibiting the formation and deposition of fouling materials on the structural parts of a wash system during basic washing with a solution having a pH >

7 of a pyrolytically produced olefin compound or compounds contaminated with at least one carbonyl compounds, said method comprising adding to said basic wash a sufficient amount for inhibiting formation of polymeric fouling materials of carbohydrazide.

12. The method of claim 11 wherein said carbonyl compounds comprise aldehydes or ketones and mixtures thereof.

13. The method of claim 11 wherein said carbohydrazide is added to said basic wash in an amount representing a molar ratio of said carbohydrazide to said carbonyl compounds of from about 0.5:

1 to about 10;

1.

14. The method of claim 11 wherein said carbohydrazide is added a molar ratio of from about 1:

1 to about 3;

1.

15. The method of claim 11 wherein said carbohydrazide is added molar ratio of about 1:

1.

16. The method of claim 11 wherein said olefin comprises a member selected from the group consisting of ethylene, propylene, butadiene and mixtures thereof.

17. The method of claim 16 wherein said olefin is in the gas phase.