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Anticorrosive coating of gas-liquid distributor and preparation method and application thereof

A technology of gas-liquid distributor and anti-corrosion coating, which is applied in the field of processing and manufacturing of gas-liquid distributor, can solve the failure of gas-liquid distributor of hydrogenation reactor, little consideration of anti-fouling performance, blockage of gas-liquid distributor, etc. problems, to improve the ability to resist hydrogen corrosion, inhibit surface fouling, and increase the service life

Inactive Publication Date: 2017-12-15
SINOPEC ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] High-temperature hydrogen corrosion will cause the gas-liquid distributor of the hydrogenation reactor to fail, crack or damage the flow plate, especially the bubble-type gas-liquid distributor is prone to blister cracking
At the same time, the gas-liquid distributor of the existing hydrogenation reactor seldom considers its anti-fouling performance from the surface treatment of the material, especially in the process of residual oil processing, it is very easy to generate gas near the bubble cap annulus or overflow hole. Clogging of the liquid distributor

Method used

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Examples

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Effect test

preparation example Construction

[0047] A second aspect of the present invention provides a method for preparing the anti-corrosion coating of the above-mentioned gas-liquid distributor, comprising the following steps:

[0048]The pretreated gas-liquid distributor is placed in an electroless nickel-phosphorus plating solution containing metal elements resistant to hydrogen corrosion for chemical plating treatment, and an anti-corrosion coating is obtained on the surface of the gas-liquid distributor.

[0049] The invention utilizes the chemical plating method to form a layer of anti-corrosion coating on the surface of the gas-liquid distributor. The anti-corrosion coating is a smooth and dense nickel-phosphorus coating containing hydrogen corrosion-resistant elements formed by the chemical plating method. Due to the addition of anti-hydrogen corrosion elements and the anti-corrosion effect of the nickel-phosphorus coating itself, the anti-hydrogen corrosion ability of the gas-liquid distributor can be signific...

Embodiment 1

[0079] This embodiment is a method for preparing an anti-corrosion coating of a gas-liquid distributor, comprising the following steps:

[0080] Step a): derusting and polishing: including sandblasting and derusting the gas-liquid distributor, polishing the surface of the gas-liquid distributor that needs electroless plating, and polishing and thinning the surface of the gas-liquid distributor to a thickness of 100nm;

[0081] Step b): Cleaning: under the action of ultrasonic waves, in a liquid environment at 50°C, first wash with alkali for 10 minutes, then pickle for 2 minutes, so as to fully ensure that the inside of the fine grooves on the surface of the gas-liquid distributor is also cleaned, and the clean grooves Grooves facilitate the fusion of the surface of the gas-liquid distributor with the anti-corrosion coating, and then rinse with distilled water;

[0082] Step c): drying: place the cleaned gas-liquid distributor in an ultrasonic alcohol solution for 5 minutes, t...

Embodiment 2

[0086] This embodiment is a preparation method of an anti-corrosion coating for a gas-liquid distributor. The difference from Example 1 is that the metal elements added to resist hydrogen corrosion are different. is molybdenum sulfate solution.

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Abstract

The invention provides an anticorrosive coating of a gas-liquid distributor and a preparation method and application thereof, and relates to the field of machining and manufacturing of gas-liquid distributors of hydrogenation reactors. The anticorrosive coating of the gas-liquid distributor is prepared from nickel-phosphorous alloy doped with metallic elements resisting hydrogen corrosion. According to the anticorrosive coating, the problems of gas-liquid distributor failures and cracks caused by high-temperature hydrogen corrosion can be effectively solved, the problem that the interior of the gas-liquid distributor is blocked can be solved, and then the purpose of prolonging the service life of the gas-liquid distributor is achieved.

Description

technical field [0001] The invention relates to the technical field of processing and manufacturing of a gas-liquid distributor of a hydrogenation reactor, in particular to an anti-corrosion coating of a gas-liquid distributor, a preparation method and an application thereof. Background technique [0002] The gas-liquid distribution plate is used in the fixed-bed hydrogenation reactor to evenly distribute the gas-liquid medium to the catalyst bed below. The gas-liquid distribution plate is composed of a distribution plate and multiple gas-liquid distributors on the distribution plate, among which the gas-liquid distributor is an important component. In a fixed-bed hydrogenation reactor, the gas-liquid distribution performance of the gas-liquid distributor directly affects the uniformity of the contact time between the reactants and the catalyst, and affects the degree to which the catalyst surface is wetted by the liquid phase. The uneven distribution of gas and liquid will...

Claims

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Application Information

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IPC IPC(8): C23C18/50C23C18/18
CPCC23C18/50C23C18/1692C23C18/1806C23C18/1844
Inventor 陈强蔡连波盛维武赵晓青李小婷
Owner SINOPEC ENG GRP CO LTD
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