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Vacuum distillation method for easily polymerizable compound and method for producing acrylic acid

一种丙烯酸、丙烯的技术，应用在有机化合物的制备、羧酸化合物的分离/纯化、化学仪器和方法等方向，达到防止堵塞的效果

Active Publication Date: 2016-06-15
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the uncondensed gas contains acrylic acid, the polymerization of acrylic acid occurs in the vicinity of the decompression device

Method used

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  • Vacuum distillation method for easily polymerizable compound and method for producing acrylic acid
  • Vacuum distillation method for easily polymerizable compound and method for producing acrylic acid
  • Vacuum distillation method for easily polymerizable compound and method for producing acrylic acid

Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0101] Similar to the comparative example, the driving steam of the steam ejector was adjusted to 1.0 MPaG, and the operation of the distillation column was performed. The time to CV opening reduction after steam injector cleaning was 3 weeks and 5 weeks without improvement.

Embodiment 1

[0103] Such as image 3 As shown, the distillation column is operated while heating the outer surfaces of the suction port of the first-stage and second-stage steam injectors, the outer surface of the vacuum part, and the outer surface of the diffuser using steam heating companion pipes. Other than that, it carried out similarly to the said comparative example 1. The steam used for steam heating with pipe is 0.3MPaG. The temperature of the outer surface of the suction port of the steam injector is 70-85°C. During 11 months of continuous operation, no significant reduction in CV opening was found. It should be noted that when the operation continued for 6 months, the piping of the steam heating trace was kept in its original state, and the steam for heating the trace was stopped for 2 days, and then the supply of steam was restarted, but it was not confirmed before and after. Significant difference. From the above results, it can be seen that heating the outer surface of th...

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Abstract

The problem addressed by the present invention is to provide a method that, in a vacuum distillation step for an easily polymerizable compound, when using a steam ejector as the vacuum device, prevents clogging of the steam ejector by polymers of the easily polymerizable compound. The problem addressed by the present invention is also to provide a method that, using the abovementioned method, produces acrylic acid, which is one easily polymerizable compound. The abovementioned problem is solved by means of a method for producing acrylic acid and containing a step for vacuum distillation by means of a steam ejector of acrylic acid obtained by means of a gas-phase contact oxidation reaction with propane, propylene, or acrolein as the starting material, wherein the vacuum distillation step contains a step for heating the outer surface of the steam ejector. Also, the abovementioned problem is solved by means of a vacuum distillation method for acrylic acid or an acrylic acid ester using a steam ejector, wherein a step is contained for heating the outer surface of the steam ejector.

Description

technical field [0001] The present invention relates to a method of vacuum distillation of an easily polymerizable compound and a method for producing acrylic acid, in particular to using a steam ejector as a decompression device in the vacuum distillation of an easily polymerizable compound to prevent the easily polymerizable compound from being polymerized inside the steam ejector Methods. In addition, the present invention also relates to a method for producing acrylic acid, which is one of easily polymerizable compounds, using this method. Background technique [0002] As a method for producing acrylic acid, there is generally known a method of collecting acrylic acid-containing gas produced by a gas-phase catalytic oxidation reaction using propane, propylene, or acrolein as a raw material in a collection solvent such as water, and separating acrylic acid from the obtained acrylic acid solution , and then the isolated acrylic acid was purified by distillation under redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/44C07C57/07F04F5/20F04F5/44
CPCF04F5/20C07C51/445C07C57/04B01D3/10B01D3/38
Inventor 小川宁之
Owner MITSUBISHI RAYON CO LTD
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