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Molecular distillation process for preparing glycerine

A technology of molecular distillation and glycerin, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, and preparation of organic compounds, can solve the problems of low yield, high cost, and low purity of glycerin, and achieve high yield, low cost, The effect of high purity

Inactive Publication Date: 2009-10-07
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of high cost of extracting high-purity glycerin in the prior art, and the low purity and low yield of glycerol obtained by the production of biodiesel by-products, and to provide a method of using molecular distillation (short-path distillation) technology to prepare The content reaches 98%, and the yield reaches more than 95% glycerin method

Method used

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  • Molecular distillation process for preparing glycerine
  • Molecular distillation process for preparing glycerine

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Coconut oil and methanol are used for esterification reaction, and the molar ratio of coconut oil and methanol is 1:6. The esterification reaction product is separated by static layering, and the lower layer liquid is separated by a high-speed centrifuge to obtain (crude glycerin) 700ml and enters the buffer tank 1, such as figure 1 As shown, then enter the degassing column 2. The degassing temperature is 60°C and the vacuum degree is 2000Pa; The temperature is 1000Pa; finally enter the second step-down mode molecular still 4 to separate 588 grams of glycerin, the temperature is 180 ° C, the vacuum is 50Pa, and the remaining impurities are discharged. The purity of the obtained distillate glycerol was 98.5%.

Embodiment 2

[0029] The esterification reaction is carried out by using tallow and ethanol, and the molar ratio of tallow and ethanol is 1:6.5. The esterification reaction product is by static layering, and 800ml of lower layer liquid (crude glycerin) is taken and enters buffer tank 1, as figure 1 As shown, then enter the degassing column 2. The degassing temperature is 100°C and the vacuum is 1000Pa; after degassing, the product enters the first-stage molecular distillation column 3 to separate the remaining ethanol from the esterification reaction. The temperature is 60°C and the vacuum is 1000Pa. 100 Pa; finally enter the second cascading mode molecular still 4 to separate 312 grams of glycerin, the temperature is 100 ° C, the vacuum is 1 Pa, and the remaining impurities are discharged. The purity of the obtained glycerol was 98.5%.

Embodiment 3

[0031] Rapeseed oil and methanol are used for the esterification reaction, and the molar ratio of rapeseed oil to methanol is 1:7. The esterification reaction product is roughly separated by high-speed centrifugation, and 600ml of crude glycerin is taken into the buffer tank 1, such as figure 1 As shown, then enter the degassing column 2. The degassing temperature is 80 ° C and the vacuum degree is 3000 Pa; after degassing, the product enters the first step-down mode molecular distillation column 3 to separate the remaining methanol from the esterification reaction. The temperature is 120 ° C and the vacuum The temperature is 2500Pa; finally enter the second step-down mode molecular still 4 to separate 510 grams of glycerin, the temperature is 200 ° C, the vacuum is 100Pa, and the remaining impurities are discharged. The purity of the obtained glycerol was 98.6%.

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Abstract

The invention discloses a method for preparing glycerol using molecular distillation technology. The method includes the following steps: ① using one or a mixture of vegetable oil or animal oil as raw materials to carry out an esterification reaction; ② crudely separating the esterification reaction product to obtain crude glycerin ; ③ Carry out molecular distillation of crude glycerol to obtain glycerol; the molecular distillation of crude glycerol is performed at a temperature of 60-200°C, a vacuum of 2500-1Pa, degassing and separating methanol or ethanol to obtain glycerin. This method can also directly carry out molecular distillation treatment on the esterification reaction product to obtain glycerin. The method of the present invention prepares glycerin, and the product of the esterification reaction can also be used to prepare biodiesel with low cost. The purity of glycerin can reach more than 98%, and it can reach standard food grade and pharmaceutical grade standards. The yield of glycerin is high, no washing and drying processes are required, and there is no wastewater pollution.

Description

Technical field [0001] The present invention relates to the preparation of high-purity glycerin, and in particular to a method for preparing glycerol using molecular distillation technology. Background technique [0002] Glycerin is an important chemical raw material that can be used to make plastics, synthetic fibers, explosives, etc. In medicine, glycerin can be used to prepare various preparations, solvents, hygroscopic agents, antifreezes and sweeteners, and to prepare external ointments or suppositories. In the coating industry, glycerol can be used to prepare various alkyd resins, polyester resins, glycidyl ethers and epoxy resins. In textile and printing and dyeing processes, glycerol is used to prepare wetting agents and fabric anti-shrinkage treatment agents. In the food industry, glycerin is used as a sweetener, a moisture absorber for tobacco, and a solvent. In addition, it is widely used in papermaking, cosmetics, tanning, photography, printing, metal processi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/80C07C31/22
Inventor 朱宝璋杨婉珍李忠
Owner SOUTH CHINA UNIV OF TECH