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Refining recovery process for crude glycerin

A crude glycerin and process technology, which is applied in the field of crude glycerin refining and recovery process, can solve the problems of removing no relevant reports and researches, the content of fatty acids, esters and easily carbonized substances in refined glycerin can not reach the standard of high-grade glycerin, etc.

Inactive Publication Date: 2017-03-22
天长市康宁甘油科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In actual production, the fatty acid, ester content and easily carbonized substances of refined glycerol refined by traditional methods generally do not meet the high-grade glycerin standards stipulated by the state.
Moreover, they only focus on the removal of fatty acids and inorganic salts in crude glycerin, but there are no relevant reports and studies on the removal of organic salts and their oligomers in glycerin.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A refining recovery process for crude glycerin, comprising the steps of:

[0021] S1. Add the crude glycerol to a sulfuric acid solution with a concentration of 20 wt%, adjust the pH to 6, heat to 70° C., stir for 60 minutes, and remove the fatty acid in the upper layer after standing for stratification;

[0022] S2. Dilute the crude glycerin treated by S1 with water to a water content of 30wt%, and then preheat to 60°C, and conduct ion exchange treatment through a D201 macroporous strong basic anion exchange resin column at a flow rate of 3.5mL / min, to obtain Primary refined glycerin;

[0023] S3. After preheating the primary product of refined glycerin obtained in S2 to 40° C., add 0.1 wt % high-efficiency adsorbent based on crude glycerin, stir for 60 minutes, let stand, and filter to obtain a semi-finished product of refined glycerin;

[0024] S4. Decompress the refined glycerin semi-finished product obtained in S3 to a vacuum of 3.0kPa, heat up to 90°C at a heatin...

Embodiment 2

[0027] A refining recovery process for crude glycerin, comprising the steps of:

[0028] S1. Add the crude glycerol to a sulfuric acid solution with a concentration of 30wt%, adjust the pH to 5, heat to 80° C., stir for 40 minutes, and remove the fatty acid in the upper layer after standing for stratification;

[0029] S2. Dilute the crude glycerol treated by S1 with water to a water content of 35wt%, then preheat to 30°C, and perform ion exchange treatment through a D201 macroporous strong basic anion exchange resin column at a flow rate of 4.7mL / min, to obtain Primary refined glycerin;

[0030] S3. After preheating the primary product of refined glycerin obtained in S2 to 30° C., add 5 wt % high-efficiency adsorbent based on crude glycerin, stir for 30 minutes, let it stand, and filter to obtain a semi-finished product of refined glycerin;

[0031] S4. Decompress the refined glycerin semi-finished product obtained in S3 to a vacuum degree of 6.0kPa, heat up to 100°C at a he...

Embodiment 3

[0034] A refining recovery process for crude glycerin, comprising the steps of:

[0035] S1. Add the crude glycerol to a sulfuric acid solution with a concentration of 25 wt%, adjust the pH to 5.5, heat to 75° C., stir for 50 minutes, and remove the fatty acid in the upper layer after standing for stratification;

[0036] S2. Dilute the crude glycerin treated by S1 with water to a water content of 32wt%, then preheat to 50°C, and conduct ion exchange treatment through a D201 macroporous strongly basic anion exchange resin column at a flow rate of 4.1mL / min, to obtain Primary refined glycerin;

[0037] S3. After preheating the primary product of refined glycerin obtained in S2 to 35° C., add 2 wt % high-efficiency adsorbent based on crude glycerin, stir for 45 minutes, let it stand, and filter to obtain a semi-finished product of refined glycerin;

[0038] S4. Decompress the refined glycerin semi-finished product obtained in S3 to a vacuum degree of 4.5kPa, heat up to 95°C at a ...

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Abstract

The invention discloses a refining recovery process for crude glycerin. The refining recovery process comprises the following steps: adding dilute acid into the crude glycerin and then adjusting pH to 5-6; heating to 70-80 DEG C and then stirring for 40-60min; standing by and layering, and then removing the fatty acid on the upper layer; adding water for diluting till the water content is 30-35wt%; preheating to 30-60 DEG C and adopting a D201 macro-pore strong basic anion exchange resin column for performing ion exchange treatment; preheating to 30-40 DEG C and then adding an efficient adsorbing material, stirring, standing by and filtering; reducing pressure and dewatering, and then adding activated carbon, stirring and filtering, thereby acquiring an end product of refined glycerin. According to the refining recovery process for crude glycerin provided by the invention, the end product of glycerin with purity reaching 99.5% or above can be effectively produced, the production cost can be effectively lowered and the energy and resource can be saved.

Description

technical field [0001] The invention relates to the technical field of glycerin refining, in particular to a process for refining and recovering crude glycerin. Background technique [0002] A large amount of by-product crude glycerol will be produced in the process of biodiesel production, about 0.1t of glycerol can be produced for every 1t of biodiesel produced. A large amount of crude glycerin water is also produced in the production process of oleochemicals. High-purity glycerin is an important industrial raw material, which is widely used in food, medicine, cosmetics and tobacco industries. my country's demand for high-purity glycerol has been in short supply. Therefore, the recycling of crude glycerin, a by-product of biodiesel, or crude glycerin water produced by oleochemicals can not only reduce the production cost of biodiesel, but also increase the source of high-purity glycerin. [0003] In actual production, the fatty acid, ester content and easily carbonized s...

Claims

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Application Information

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IPC IPC(8): C07C29/76C07C31/22
CPCC07C29/76C07C31/225
Inventor 祁建兵
Owner 天长市康宁甘油科技有限公司
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