CN110541170A

CN110541170A - water-soluble corrosion inhibitor

Info

Publication number: CN110541170A
Application number: CN201910729597.6A
Authority: CN
Inventors: 朱浩良; 潘勇
Original assignee: Wuhan Sanyou Petrochemical Co Ltd
Current assignee: Wuhan Sanyou Petrochemical Co Ltd
Priority date: 2019-08-08
Filing date: 2019-08-08
Publication date: 2019-12-06

Abstract

The invention discloses a water-soluble corrosion inhibitor, which comprises the following components in percentage by mass: 5 to 30 percent of oleic acid imidazoline, 1 to 30 percent of ethylenediamine, 0.01 to 0.1 percent of nonylphenol polyoxyethylene ether, 0.1 to 5 percent of demulsifier, 0.1 to 0.5 percent of chelating agent and the balance of tap water. The corrosion inhibitor has good corrosion inhibition effect on an oil refining device, has no adverse effect on the catalyst of the device, the quality of oil products and subsequent oil refining processing devices, has low cost and convenient use, and improves the prior production process of the water soluble corrosion inhibitor by using deionized water and easily emulsified oil-carrying oil in the use process.

Description

Water-soluble corrosion inhibitor

[ technical field ] A method for producing a semiconductor device

The invention relates to a corrosion inhibitor, in particular to a water-soluble corrosion inhibitor capable of preventing equipment from being corroded by hydrogen chloride and hydrogen sulfide in an oil refining device.

[ background of the invention ]

In recent years, with the trend of high sulfur and high acid of processed crude oil, the corrosion of oil refining equipment by hydrogen chloride and hydrogen sulfide in reaction products is increasingly serious. The corrosion inhibitor in the market generally has poor corrosion inhibition effect on equipment, the corrosion inhibitor with better effect has influence on the weight of a device catalyst and oil products, and meanwhile, the corrosion inhibitor is higher in cost and inconvenient to use.

therefore, it is necessary to design a corrosion inhibitor which has good corrosion inhibition effect on equipment, does not have adverse effect on the quality of a catalyst and an oil product of a device, has low cost and is convenient to use, so as to overcome the problems.

[ summary of the invention ]

in view of the above, in order to overcome the defects in the prior art, the invention provides a water-soluble corrosion inhibitor which can prevent hydrogen chloride and hydrogen sulfide in an oil refining device from corroding equipment, has a good corrosion inhibition effect on the equipment, has no adverse effect on the quality of a catalyst and oil of the device, and has low cost.

In order to achieve the purpose, the technical scheme of the invention is as follows:

A water-soluble buffer comprises the following components in percentage by mass:

5-30% of oleic acid imidazoline, 1-30% of ethylenediamine, 0.01-0.1% of nonylphenol polyoxyethylene ether, 0.1-5% of demulsifying agent, 0.1-0.5% of chelating agent and the balance of tap water.

Preferably, the oleic imidazoline comprises 5% or 10% or 20%.

Preferably, the ethylene diamine accounts for 1% or 5% or 20%.

The proportion of the polyoxyethylene nonyl phenyl ether is 0.01 percent or 0.05 percent or 0.1 percent.

The proportion of the demulsifier is 0.1 percent or 0.5 percent or 5 percent.

The chelating agent accounts for 0.1% or 0.3% or 0.5%.

the invention has the advantages of good corrosion inhibition effect on the oil refining device, no adverse effect on the catalyst and oil quality of the device and the subsequent oil refining processing device, low cost and convenient use, and improves the adverse factors that deionized water is required to be used in the traditional water soluble corrosion inhibitor process and oil is easily emulsified and carried in the use process.

[ detailed description ] embodiments

the technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

5 to 30 percent of oleic acid imidazoline, 1 to 30 percent of ethylenediamine, 0.01 to 0.1 percent of nonylphenol polyoxyethylene ether, 0.1 to 5 percent of demulsifying agent, 0.1 to 0.5 percent of chelating agent and the balance of tap water.

the technical solution of the present invention is explained in detail by a plurality of specific examples as follows:

the formulations of the water-soluble corrosion inhibitors of examples 1-11 are shown in Table 1.

TABLE 1

Evaluating the corrosion inhibition effect:

the method comprises the following steps:

(1) a 12L corrosion medium consisting of HCl (1000mg/L) aqueous solution,

(2) Pouring the corrosive medium into 12 identical containers, wherein each container is filled with 1000mL of corrosive medium;

(3) Cleaning and weighing 12A 20 carbon steel test pieces with the same specified size for later use;

(4) Weighing 100mg of the corrosion inhibitors prepared according to the formulas of the embodiments 1 to 11, respectively adding the corrosion inhibitors into 11 containers filled with corrosion media, and taking the last corrosion inhibitor as a control group;

(5) And respectively suspending 12 spare A20 carbon steel test pieces in corrosion media of 12 containers at 80 +/-2 ℃, taking out the test pieces for 6 hours, cleaning and weighing.

(6) Calculating the corrosion inhibition rate (R):

R＝(△G-△G)/△G×100％

In the formula: the delta G0 is the mass difference G between the front and the back of the test piece of the control group; the delta G1 is G, the mass difference between before and after the test by adding the corrosion inhibitor test piece.

The results are as follows:

as can be seen from the above table: the corrosion inhibitors of the formulas of examples 1-9 all have a corrosion inhibition rate of over 84 percent and can be used as industrial products; the corrosion inhibitor prepared by the formula in the embodiment 7 has good corrosion inhibition effect and lowest cost, and is a preferred formula of industrial products.

in conclusion, the invention has the following beneficial effects:

(1) the water-soluble corrosion inhibitor prepared according to the invention has the advantages of simple and common raw materials and low cost;

(2) according to the invention, the problem of easy emulsification and oil entrainment in the use process of the traditional corrosion inhibitor is solved after the demulsifier is added;

(3) According to the invention, the cost problem that deionized water is required to be used in the prior production of the corrosion inhibitor is solved after the chelating agent is added;

(4) the water-soluble corrosion inhibitor prepared according to the invention can effectively reduce the corrosion of hydrogen chloride and hydrogen sulfide in reaction products to equipment;

(5) The water-soluble corrosion inhibitor prepared according to the invention can form a compact monomolecular adsorption protective film on the metal surface, and effectively inhibit the corrosion of a dew point and an extension area thereof;

(6) The water-soluble corrosion inhibitor prepared according to the invention has no adverse effect on the quality of the device catalyst and oil.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The water-soluble corrosion inhibitor is characterized by comprising the following components in percentage by mass: 5 to 30 percent of oleic acid imidazoline, 1 to 30 percent of ethylenediamine, 0.01 to 0.1 percent of nonylphenol polyoxyethylene ether, 0.1 to 5 percent of demulsifier, 0.1 to 0.5 percent of chelating agent and the balance of tap water.

2. The water soluble corrosion inhibitor of claim 1 wherein said oleic imidazoline is present in an amount of 5% or 10% or 20%.

3. The corrosion inhibitor of claim 1, wherein the ethylene diamine is present in an amount of 1% or 5% or 20%.

4. The water-soluble corrosion inhibitor of claim 1 wherein said nonylphenol polyoxyethylene ether is present in an amount of 0.01% or 0.05% or 0.1%.

5. The water-soluble corrosion inhibitor according to claim 1, wherein said demulsifier is present in an amount of 0.1% or 0.5% or 5%.

6. The corrosion inhibitor of claim 1, wherein the chelating agent is present at a level of about 0.1%, or about 0.3%, or about 0.5%.