Corrosion inhibitor

a corrosion inhibitor and corrosion technology, applied in the direction of separation process, dispersed particle separation, chemistry apparatus and processes, etc., can solve the problems of general surface corrosion of metals by chemicals dissolved in electrolyte, corrosion problem, and detract from their universal us

Inactive Publication Date: 2002-01-03
INTERCORR INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0013] In addition, the present invention, according to another embodiment, is directed to a new non-toxic corrosion inhibitor which provides protection against corrosion in alkanolamine, hot carbonate solution, diglyme or other solvent gas treating plants used for the removal of acid gases, such as CO.sub.2, H.sub.2S, or mixtures thereof.

Problems solved by technology

General surface corrosion of metals by chemicals dissolved in an electrolyte is a common problem in the operation of industrial processes which utilize amines, alkanol amines, hot carbonate solutions, or diglyme as reactants, products, solvents, etc.
The presence of acid gases and the resulting necessity for its stripping by gas treatment services inherently results in a corrosion problem.
This problem is particularly acute and / or critical when carbon steels are used in the equipment to save on capital costs over the use of more exotic and expensive metal alloys such as stainless steel.
While the above compositions are effective, they each have various defects which detract from their universal use.
For example, compounds of arsenic, antimony, vanadium and other heavy metals are known to be toxic and their use presents waste disposal problems for the plant operators.

Method used

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Examples

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Effect test

example 2

[0036] An inhibitor composition of the present invention is produced in two stages. In the first stage, about 40 weight percent of a mixture of 85 weight percent monoethanolamine and 15 weight percent water is added to about 60 weight percent of a mixture of 37 weight percent formaldehyde and 7 weight percent methanol in water. In the second stage, the first stage reaction product is titrated with amine heads obtained from Monsanto Chemical to a pH ranging between about 10.5 and about 12.0, or until polymerization occurs and formaldehyde and formaldehyde donor disappears. This occurs when about 14 weight percent amine heads is added to about 86 weight percent of the first stage reaction product. A black liquid product is produced that contains some insoluble polymer, which may precipitate.

example 3

[0037] The product produced by the two-stage reaction of Example 2 is diluted by further mixing with about 5 weight percent of a surfactant, Texaco Surfonic N-150, and an amount of methanol approximately equal in weight to the weight of the product of Example 2.

example 4

[0038] The product produced by the two-stage reaction of Example 2 is diluted by further mixing with about 5 weight percent of a surfactant, cocoamidopropyldimethylbenzyl quaternary ammonium chloride, and an amount of water approximately equal in weight to the weight of the product of Example 2.

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Abstract

The present invention is directed to an aqueous amine resin corrosion inhibitor composition and methods of using the same for inhibiting corrosion in equipment in contact with alkanolamine, hot carbonate solutions, diglyme and/or other solvents and acid gases such as carbon dioxide, hydrogen sulfide or a mixture of the two. The inhibitor preferably relates to compositions useful for inhibiting corrosion in environments in contact with alkanolamine, hot carbonate solutions, diglyme, and/or solvent gas treating systems and acid gases, and more particularly, to an amine resin solution made by reacting sterically hindered amines such as those selected from the group consisting of alkyl diamines, alkyltriamines, amino alcohols and mixtures thereof with aldehydes, aldehyde donors, the reaction product of lower alkanolamines and lower aldehydes, and mixtures thereof. The subject compositions are preferably made by reacting the sterically hindered amines and aldehyde compounds in about a 1:1 molar ratio at a temperature ranging from about 110° F. to 120° F., using a sufficient amount of the sterically hindered amine to produce a reaction product having a pH ranging from about 10.5 to about 12.0.

Description

[0001] The present invention relates to corrosion inhibitors. In a preferred embodiment, the invention relates to a corrosion inhibitor which provides protection against corrosion in alkanolamine, hot carbonate solution, diglyme, and / or other solvent planks used for removal of acid gases, e.g. CO.sub.2, H.sub.2S or mixtures of the two. Specifically, the invention relates to a new aqueous amine resin corrosion inhibitor.BACKGROUND OF INVENTION[0002] General surface corrosion of metals by chemicals dissolved in an electrolyte is a common problem in the operation of industrial processes which utilize amines, alkanol amines, hot carbonate solutions, or diglyme as reactants, products, solvents, etc. For example, it is known that acid gases, such as carbon dioxide and H.sub.2S, can be removed from gaseous feed streams, such as natural gas and synthesis gas, using dilute aqueous solutions of alkanol amines, such as monoethanolamine, diethanolamine, and methyl diethanolamine, and other weak...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01D53/14C23F11/06
CPCB01D53/1412B01D53/1493C23F11/06
Inventor ASPERGER, ROBERT G.TEBBAL, SAADEDINEKANE, RUSSELL D.
Owner INTERCORR INT
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