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Technology for removing ammonia in ammoniacal smell ethanol in tetramethylpiperidinol

A technology of tetramethylpiperidol and ethanol, applied in the field of ammonia removal technology, can solve the problems of cumbersome reaction steps, a large amount of energy consumption and the like, and achieve the effects of simple method and convenient operation

Active Publication Date: 2012-12-12
ZHENXING FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, how to remove liquid ammonia in ethanol solvent becomes an important issue in the production process of tetramethylpiperidinol. Generally, chemical methods are used to process, and ammonia salt is obtained through acid-base neutralization, and then through steps such as dehydration and desalination, although it can be Effectively remove a small amount of ammonia, but the reaction steps are cumbersome, and the ethanol distillation dehydration process requires a lot of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] A. Adsorption stage: The ammonia-flavored ethanol mixture enters the strong acid resin fixed bed for adsorption at a flow rate of 1 L / min.

[0009] Ammonia is adsorbed on the resin, and the adsorption effluent is a qualified ethanol solution, and the amount of ammonia will be changed from 5% to 0.5%;

[0010] B. Elution stage: After ammonia adsorption is saturated, use hydrochloric acid solution to elute ammonia from the fixed bed at a flow rate of 0.3L / min, and recover liquid ammonia.

Embodiment 2

[0012] A. Adsorption stage: The ammonia-flavored ethanol mixture enters the strong acid resin fixed bed for adsorption at a flow rate of 1.5 L / min.

[0013] Ammonia is adsorbed on the resin, and the adsorption effluent is a qualified ethanol solution, and the amount of ammonia will be changed from 5% to 0.8%;

[0014] Elution stage: After ammonia adsorption is saturated, use hydrochloric acid solution to elute ammonia from the fixed bed at a flow rate of 0.3L / min, and recover liquid ammonia.

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PUM

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Abstract

The invention discloses a technology for removing ammonia in ammoniacal smell ethanol in tetramethylpiperidinol. The technology comprises an adsorption stage and an elution stage. The technology is characterized in that in the adsorption stage, an ammoniacal smell ethanol mixed solution enters into a highly acidic ion exchange resin fixed bed at a flow rate of 1 to 1.5L / min and liquid ammonia is adsorbed by a highly acidic ion exchange resin and eluate is a qualified ethanol solution; and in the elution stage, after adsorbed ammonia is saturated, the adsorbed ammonia is eluted from the highly acidic ion exchange resin fixed bed by a hydrochloric acid solution at a flow rate of 0.3L / min and liquid ammonia is recovered. The technology provided by the invention utilizes the highly acidic ion exchange resin fixed bed to treat ammonia in ethanol, replaces the existing neutralization ammonia-removal method, has simple processes, is convenient for operation and reduces energy consumption.

Description

technical field [0001] The invention relates to an ammonia removal process, in particular to an ammonia removal process for ammonia-flavored ethanol in tetramethylpiperidinol. Background technique [0002] In the production process of tetramethylpiperidinol, its solvent includes ethanol and a small amount of ammonia. The ammonia solution is easy to corrode equipment and has an impact on subsequent reactions. Therefore, how to remove liquid ammonia in ethanol solvent becomes an important issue in the production process of tetramethylpiperidinol. Generally, chemical methods are used to process, and ammonia salt is obtained through acid-base neutralization, and then through steps such as dehydration and desalination, although it can be Effectively remove a small amount of ammonia, but the reaction steps are cumbersome, and the ethanol distillation dehydration process requires a lot of energy consumption. Contents of the invention [0003] The purpose of the present invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/76
Inventor 陈建华夏跃雄徐鸿彬
Owner ZHENXING FINE CHEM CO LTD