Corrosion inhibitor

a corrosion inhibitor and inhibitor technology, applied in the field of corrosion inhibitors, can solve the problems of damage to the iron-containing metal surface of processing equipment, severe corrosion problems, and exacerbated corrosion problems, and achieve the effect of inhibiting naphthenic acid corrosion and preventing corrosion

Inactive Publication Date: 2007-05-31
BAKER HUGHES INC
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  • Abstract
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  • Application Information

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Benefits of technology

[0013] In one aspect, the present invention is a method for inhibiting naphthenic acid corrosion in a fluid containing a corrosive amount of naphthenic acid, the method comprising adding, to the fluid or to

Problems solved by technology

It is widely known in the art that the processing of crude oil in its various fractions may lead to damage of iron-containing metal surfaces of the processing equipment.
(−752° F.) temperatures customarily used to refine and distill the oil, the corrosion problem is typically further exacerbated.
When hydrocarbons containing such naphthenic acid contact iron-containing metals, especially at elevated temperatures, severe corrosion problems arise.
These attempts are generally disadvantageous in that they require additional processing and/or add substantial cost to treatment of the crude oil.
While these tetrahydrothiazoles phosphonic acids or esters offer good corrosion inhibition, they tend to break do

Method used

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Examples

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Effect test

example 1

[0021] A test of the invention is performed by first determining the level of corrosion for a blank.

[0022] The procedure includes the step of adding 282 grams of mineral oil to a reaction flask. A test cell is sparged with nitrogen at a rate of from 10-20 mL / min for a period of 30 to 60 minutes with continuous stirring. The heaters are set at 288° C. and the test cell is sparged with 1 mol-percent H2S in nitrogen for the remainder of the test. The test procedure is run with a total acid number of 10 mg KOH, a temperature of 288° C., a run time of 24 hours, and 1 mol-percent of hydrogen sulfide in nitrogen, using C1018 carbon steel coupons. A “blank” is first tested, without corrosion inhibitor, to determine the amount of corrosion that occurs. About 20 g of commercial naphthenic acids having a total acid number of 151 are injected 30 minutes after the coupon is inserted into the test cell. Then a first test of the invention is done using another coupon and the same procedure, excep...

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Abstract

A composition and method of inhibiting corrosion caused by naphthenic acid in fluids includes using a combination of a thiophosphorus compound and a hydrogen sulfide scavenging compound. The hydrogen sulfide scavenging compound significantly enhances the performance of the thiophosphorus compound and may be included at relatively low levels in the composition. The treatment may be applied to fluids including crude oils and lighter fractions thereof.

Description

CROSS-REFERENCE TO A RELATED APPLICATION [0001] This application claims the benefit of U.S. Provisional Application No. 60 / 741,430, filed Nov. 30, 2005.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to corrosion inhibitors. The present invention particularly relates to corrosion inhibitors useful for applications in which naphthenic acids are present. [0004] 2. Background Art [0005] It is widely known in the art that the processing of crude oil in its various fractions may lead to damage of iron-containing metal surfaces of the processing equipment. This corrosion is frequently associated with, in particular, the presence and activity of naphthenic acid. The corrosion occurs when the amount of naphthenic acids in the hydrocarbon reaches some critical value indicated by total acid number (“TAN”), expressed as milligrams of potassium hydroxide required to neutralize the acids in a one-gram sample. Older literature uses a rule of thumb...

Claims

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Application Information

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IPC IPC(8): C10G7/10
CPCC07F9/1651C10G75/02C10G2300/80C10G2300/203C10G2300/207C10G2300/1033C10G7/10
Inventor HARRELL, BRADLEY G.POLLARD, DAVID G.ZETLMEISL, MICHAEL J.STARK, JOSEPH L.ZIEGLER, ROBERT J.MCELHINNEY, MICHAEL
Owner BAKER HUGHES INC
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