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Super-amphiphobic coating on surface of heat exchange tube, preparation technology of super-amphiphobic coating and application of super-amphiphobic coating to methanol-to-olefin device

A preparation process and technology for heat exchange tubes, applied in the direction of surface coating liquid devices, coatings, special surfaces, etc., can solve problems such as clogged equipment, frequent parking to remove wax, and easy wax deposition in heat exchangers, etc., to achieve reduction Brittleness, effect of increasing mechanical strength

Pending Publication Date: 2021-03-19
YULIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of the above-mentioned prior art that the heat exchanger is easy to be waxed and block the equipment during the process of methanol to olefins, and frequent shutdowns are required to remove the wax, and to provide a super-amphiphobic coating on the surface of the heat exchange tube and its preparation Method and application in methanol to olefins unit

Method used

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  • Super-amphiphobic coating on surface of heat exchange tube, preparation technology of super-amphiphobic coating and application of super-amphiphobic coating to methanol-to-olefin device
  • Super-amphiphobic coating on surface of heat exchange tube, preparation technology of super-amphiphobic coating and application of super-amphiphobic coating to methanol-to-olefin device
  • Super-amphiphobic coating on surface of heat exchange tube, preparation technology of super-amphiphobic coating and application of super-amphiphobic coating to methanol-to-olefin device

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Put the heat exchange tube in a 1mol / L NaOH solution, soak for 3 hours, neutralize it with a 0.5mol / L hydrochloric acid solution, rinse it with tap water 5 times, and dry it in a nitrogen atmosphere;

[0035](2) Place the outer surface of the heat exchange tube under a high-speed sandblasting machine for sandblasting to remove surface impurities and roughen the surface;

[0036] (3) Spray fluorine-containing paint evenly on the outer surface of the heat exchange tube at 0.5 MPa to form a 20-50 μm thick coating to enhance its adhesion. At the same time, ensure that the composite coating powder can evenly adhere to the outer surface of the heat exchange tube ; The fluorine content in the fluorine paint is 25%;

[0037] (4) Add 2g of ethylene chlorotrifluoroethylene copolymer to 60ml of ethyl acetate solution, stir ultrasonically for 20min, then add 0.4g SiO2 / ZnO composite particles and 0.08g polyaniline, stir ultrasonically for 1h, and disperse the mixture evenly , t...

Embodiment 2

[0040] (1) Put the heat exchange tube into 0.3mol / L NaOH solution, soak for 4h, neutralize with 0.5mol / L hydrochloric acid solution, rinse with tap water 4 times, and dry in nitrogen atmosphere;

[0041] (2) Place the outer surface of the heat exchange tube under a high-speed sandblasting machine for sandblasting to remove surface impurities and roughen the surface;

[0042] (3) Spray fluorine-containing paint evenly on the outer surface of the heat exchange tube at 0.7 MPa to form a 20-50 μm thick coating to enhance its adhesion, and at the same time, ensure that the composite coating powder can evenly adhere to the outer surface of the heat exchange tube ; The fluorine content in the fluorine-containing paint is 27%;

[0043] (4) Add 5g of ethylene chlorotrifluoroethylene copolymer to 150ml of ethyl acetate solution, stir ultrasonically for 20min, then add 1.0g SiO2 / ZnO composite particles and 0.2g polyaniline, stir ultrasonically for 3h, and disperse the mixture evenly , t...

Embodiment 3

[0046] (1) Put the heat exchange tube into 0.7mol / L NaOH solution, soak for 3.5h, neutralize with 0.5mol / L hydrochloric acid solution, rinse with tap water 3 times, and dry in nitrogen atmosphere;

[0047] (2) Place the outer surface of the heat exchange tube under a high-speed sandblasting machine for sandblasting to remove surface impurities and roughen the surface;

[0048] (3) Spray the fluorine-containing paint evenly on the outer surface of the heat exchange tube at 0.6 MPa to form a 20-50 μm thick coating to enhance its adhesion. At the same time, ensure that the composite coating powder can evenly adhere to the outer surface of the heat exchange tube ; The fluorine content in the fluorine paint is 29%;

[0049] (4) Add 10g of ethylene chlorotrifluoroethylene copolymer to 150ml of ethyl acetate solution, stir ultrasonically for 30min, then add 2.0g SiO2 / ZnO composite particles and 0.4g polyaniline, and stir ultrasonically for 2h to disperse the mixture evenly , to obta...

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Abstract

The invention discloses a super-amphiphobic coating on the surface of a heat exchange tube, a preparation method of the super-amphiphobic coating and application of the super-amphiphobic coating to amethanol-to-olefin device, and belongs to the technical field of wax removal of heat exchangers in the methanol-to-olefin process. Fluorine-containing paint is evenly sprayed on the surface of the heat exchange tube, the formed coating can enhance the adhesive force, and it is guaranteed that composite coating powder is evenly attached to the surface of the heat exchange tube; in the preparation process of the second coating, a small amount of carbon nanotube powder is uniformly sprayed on the coating, so that a nano-micro structure can be formed, the amphiphobic property can be improved, theheat-conducting property of the coating can be improved, the electrochemical corrosion can be weakened through addition of polyaniline, and the anti-corrosion timeliness of the coating is improved. The high-temperature resistance, the mechanical strength and the adhesive force of the coating can be improved by spraying the coating twice and performing gradient baking. According to the super-amphiphobic coating, the preparation method and the application, the wax deposition rate of the tube wall of the heat exchanger can be effectively reduced, the problems of wax deposition and blockage of thetube wall and blockage of subsequent equipment can be effectively alleviated, and the shutdown cleaning frequency of the heat exchanger can be remarkably reduced, so that the methanol-to-olefin production efficiency can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of wax removal for heat exchangers in the methanol-to-olefins process, and relates to a super-amphiphobic coating on the surface of a heat exchange tube, a preparation method thereof, and an application in a methanol-to-olefins device. Background technique [0002] Coal-to-olefins has attracted much attention as an emerging coal chemical project, among which methanol-to-olefins (MTO) is the core process of coal-to-olefins. The MTO coal-to-olefins unit uses crude methanol or refined methanol as a raw material to generate low-carbon olefin product gas through the MTO catalyst. The product gas is washed in the quenching water washing system, cooled and lowered to remove catalyst and water, and then sent to olefins The separation unit is used for the purification of ethylene, propylene, C4 and other products. The MTO process produces 56% of water and a small amount of oil by-product while generating light olefi...

Claims

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Application Information

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IPC IPC(8): B05D5/08B05D7/00B05D3/10B05D3/02C09D123/08C09D5/08C09D7/61C09D7/65C09D5/00C09D179/02C07C1/20C07C11/02F28F19/02
CPCB05D5/083B05D7/582B05D3/0254B05D3/10C09D123/0892C09D5/08C09D5/18C09D7/61C09D7/65C09D5/002C09D179/02C07C1/20F28F19/02C08K2003/2296B05D2506/10B05D2506/20B05D2518/00C08L79/02C08K3/36C08K3/22C08K3/041C07C11/02B05D2420/01B05D2420/02Y02P30/20Y02P30/40
Inventor 任国瑜任刘鹏李宗龙乔林玉闫朝任旭郭伟谯泽庭
Owner YULIN UNIV
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