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Method of preventing solid adhesion

A solid material and material technology, applied in the direction of pipeline heating/cooling, mechanical equipment, pipes/pipe joints/fittings, etc., to achieve the effect of suppressing the rise of supersaturation, preventing the precipitation of impurities, and preventing the reduction of temperature

Active Publication Date: 2007-10-10
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] However, even if the outside of the pipe or container is coated with an insulating material, the temperature drop cannot be prevented very well

Method used

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  • Method of preventing solid adhesion
  • Method of preventing solid adhesion
  • Method of preventing solid adhesion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In a stainless steel pipe with an outer diameter of 114.3mm, a thickness of 3.0mm, and a length of about 20m, at a temperature of 94°C and a flow rate of 34m 3 A methacrylic acid-containing solution containing methacrylic acid: 99% by mass and other impurities: 1% by mass (of which terephthalic acid: 800ppm) was circulated under the condition of / h (flow rate was adjusted by a control valve). A copper tube with an outer diameter of 8 mm and a thickness of 1 mm was wound as a heating device on the outside of the tube at a pitch of 50 mm, and steam at a temperature of 144° C. circulated inside the copper tube. In addition, the pipes and copper pipes through which the methacrylic acid-containing solution flows were covered with glass wool having a thickness of 50 mm to keep them warm.

[0031] After continuing to circulate in this state for 3 months, the solution containing methacrylic acid was drained, and the inside of the pipe was judged by visual observation. As a res...

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Abstract

To provide facilities for an easily polymerizing material and a method for preventing adhesion of a solid body preventing the solid body of impurities from adhering on an inner surface of a tube or a vessel. The facility for the easily polymerizing material is provided with a tube or a vessel including liquid containing the easily polymerizing material therein, and a heating means heated up to temperature of the liquid containing the easily polymerizing material or more and heating the liquid containing easily polymerizing material. Temperature difference T2-T1 between temperature T1 of the liquid containing the easily polymerizing material and temperature T2 of the heating means is preferably kept in a range of 1[deg.]C and more, and 100[deg.]C and less.

Description

technical field [0001] The present invention relates to a method for preventing the adhesion of solid matter in equipment for easily polymerizable substances that handle easily polymerizable substances. Background technique [0002] Methacrylic acid, one of easily polymerizable substances, is produced by, for example, gas-phase oxidation of isobutylene, t-butanol or methacrolein. However, the methacrylic acid obtained after gas-phase oxidation will contain a lot of impurities such as terephthalic acid, water, acetic acid, acrylic acid and the like. The nature of terephthalic acid among these impurities is that the solubility of phase methacrylic acid is very low. Therefore, when the liquid containing terephthalic acid is cooled due to the heat conduction of the wall of the pipe or container, the saturation solubility of terephthalic acid is reduced and precipitated, and the solid matter of terephthalic acid often adheres to the inner wall of the pipe or container superior....

Claims

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Application Information

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IPC IPC(8): F16L53/00
Inventor 安藤佳正加峯靖弘丸本武弘
Owner MITSUBISHI CHEM CORP
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