Metal silicate and organic deposit inhibitor/dispersant for thermal recovery operations of hydrocarbon fuels

Patent metadata

Field	Value
Publication number	US-9932255-B2
Application number	US-201615196779-A
Country	US
Kind code	B2
Filing date	Jun 29, 2016
Priority date	Jun 30, 2015
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

The present invention generally relates to methods for removing an organic deposit or for inhibiting deposition of deposit-forming comprising contacting a cleaning composition or an anti-coking composition with a surface. The surface can have an organic deposit or be susceptible to forming an organic deposit and the surface can be in contact with a liquid containing organics. The liquid can be produced from a thermal recovery system, and the surface can be an internal surface of a piece of steam-generating or vapor-generating equipment.

First claim

What is claimed is:

1. A method for removing an organic deposit, or for inhibiting the deposition of deposit-forming organics on a surface, comprising contacting said surface with a cleaning composition comprising:
a) an alkoxylated alkylphenol-formaldehyde polymer;
b) an alkoxy alcohol; and
c) at least one aromatic solvent;
wherein said surface contains an organic deposit, or is susceptible to forming an organic deposit when said surface is in contact with a liquid containing organics, wherein said liquid is being produced from a thermal recovery system, and wherein said surface is an internal surface of a piece of steam-generating or vapor-generating equipment.

2. The method of claim 1 wherein the alkoxylated polymer comprises an ethoxylated nonylphenol-formaldehyde polymer.

3. The method of claim 2 wherein the nonylphenol-formaldehyde polymer has a molar ratio of nonylphenol to formaldehyde of about 1:1.

4. The method of claim 3 , wherein the molar ratio of ethylene oxide to nonylphenol-formaldehyde polymer is from about 6:1 to about 10:1.

5. The method of claim 4 , wherein the molecular weight of the ethoxylated nonylphenol polymer is from about 4000 to about 10000 Daltons.

6. The method of claim 5 , wherein the molar ratio of ethylene oxide to nonylphenol-formaldehyde polymer is from about 8:1 to about 10:1 and the molecular weight of the polymer is from about 4000 to about 5500 Daltons.

7. The method of claim 1 wherein the cleaning composition comprises:
a) from about 30 wt % to about 60 wt. % of said alkoxylated alkylphenol-formaldehyde polymer;
b) From about 1 wt. % to about 20 wt. % alkoxy alcohol;
c) from about 20 wt % to about 60 wt. % of a heavy aromatic solvent; and
d) from about 5 wt % to about 20 wt. % additional aromatic solvent.

8. The method of claim 7 wherein the cleaning composition comprises:
a) from about 40 wt. % to about 50 wt % of said alkoxylated alkylphenol-formaldehyde polymer;
b) from about 1 wt % to about 10 wt % 2-butoxyethanol;
c) from about 30 wt. % to about 50 wt % naphtha; and
d) from about 8 wt % to about 15 wt % xylene.

9. The method of claim 1 wherein the piece of steam-generating or vapor-generating equipment is a steam generator, a tube bundle, an evaporator, a sump, a containment vessel, a pump, or a distributor plate.

10. The method of claim 9 wherein the equipment is a once-through steam generator (OTSG), a once-through heat recovery steam generator (HRSG), or an evaporator.

11. The method of claim 10 wherein the piece of equipment is an evaporator or a once-through steam generator.

12. The method of claim 1 wherein the method further comprises contacting said surface with an inorganic or organic compound that inhibits the deposition of silica or silicate on said surface.

13. The method of claim 1 wherein the method is performed when the piece of equipment is off-line.

14. The method of claim 1 wherein the method is performed when the piece of equipment is on-line.

15. The method of claim 1 wherein the cleaning composition has a concentration of from about 0.5 ppm to about 150 ppm based on the total weight of the liquid containing organics.

16. The method of claim 1 wherein the piece of equipment is used in a thermal recovery system.

Assignees

• Ecolab Usa Inc

Inventors

• Hoots John E
• Maharajh Edward
• Sommese Anthony G
• Keizer Timothy S

Classifications

• C11D7/263

  Ethers · CPC title

• C02F2101/10

  Inorganic compounds · CPC title

• C02F2303/10

  Energy recovery · CPC title

• C11D11/0041

  Chemistry & Metallurgy · mapped topic

• C11D7/5027

  Hydrocarbons · CPC title