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Preparing method for pure glycerine

A production method and technology of glycerin, which is applied in the field of oleochemicals, can solve the problems of reducing the quality of finished glycerin, and achieve the effect of increasing the quality of glycerin and reducing oxidative decomposition

Inactive Publication Date: 2005-02-23
杨宏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Products from these reactions become impurities in the glycerin, reducing the quality of the finished glycerin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: After the crude glycerin is degassed and dried by circulation, add sodium oxalate, the amount of sodium oxalate added is 0.2‰ of glycerin, after fully mixing, filter and enter the still, the absolute pressure of the still is controlled at 280-340pa, the liquid phase The temperature is controlled at 136°C--138°C, the glycerin is condensed and deodorized by circulation, and the product is obtained through continuous decolorization process. The purity of finished product glycerin is 99.73%, specific gravity (d 20 20 ) is 1.2636, no peculiar smell, chromaticity (Hazen) 5.

Embodiment 2

[0013] Example 2: After the crude glycerin is degassed and dried, potassium oxalate is added, and the amount of potassium oxalate is 0.22‰. After fully mixing and filtering, it enters the still. The absolute pressure of the still is controlled at 150-220pa, and the liquid phase temperature is controlled at 131 --134°C, after glycerin is condensed, the product is obtained through a cycle deodorization and continuous decolorization process. The glycerin purity of finished glycerin is 99.62%, specific gravity (d 20 20 ) is 1.2632 without peculiar smell, and the chromaticity is (Hazen) 5.

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Abstract

This invention is a producing method of pure glycerol. It improve the existing method of continuous distillation. First remove the gas from coarse glycerol and dry it circularly and then insert soluble oxalate. Secondly, mix them statically and then filter it. Thirdly, distill them under certain temperature and pressure. Finally, deodorize it circular and decolor it continuous. The invention solves the problem that the existing method to produce pure glycerol involves by-reaction, and it avoids contaminant such as hydronitrogen, volatile grease, and acrolein. Additionally, the pureness of the glycerol can be up to 99.5%, and moreover, it has no peculliar smell and meets the demand of food and medicine.

Description

Technical field [0001] The invention belongs to the technical field of oleochemical industry, in particular to a method for producing pure glycerin by further refining crudely refined glycerin to reach a purity of more than 99.5%. Background technique [0002] The sweet water generated after oil hydrolysis can be pretreated by medicament and concentrated by evaporation to obtain 85-88% crude glycerol. The crude glycerol is refined into glycerol with a purity of 99%. There are two production processes in the prior art: continuous distillation and intermittent distillation. Compared with the gap method, the continuous method has the advantages of stable product quality and easy control of process parameters in the production process. The production process of the continuous method is: crude glycerin is obtained through the processes of circular degassing and drying, circular distillation, circular deodorization, and continuous decolorization to obtain pure glycerin. The gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C1/00
Inventor 杨宏
Owner 杨宏
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