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Refining process of biodiesel product crude glycerol

A technology of biodiesel and crude glycerin, which is applied in the separation/purification of hydroxyl compounds, organic chemistry, and other chemical processes, and can solve the problem that the content of glycerides cannot meet the standards of high-grade glycerin

Inactive Publication Date: 2017-06-13
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

In actual production, the fatty acid, ester content and easily carbonized substances of glycerol refined by traditional methods generally do not meet the high-grade glycerin standards stipulated by the state.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A process for refining biodiesel by-product crude glycerin, comprising the steps of:

[0021] S1. Add sulfuric acid solution with a concentration of 40wt% to crude glycerin to acidify to pH 4, heat to 30°C and stir for 30 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 25 wt%, add 10 wt% high-efficiency alkalized adsorbent based on crude glycerin, stir for 30 minutes, and then filter to obtain the primary product of refined glycerin;

[0023] S3. Preheat the refined glycerol primary product obtained in S2 to 80° C., add a sodium hydroxide solution with a concentration of 30 wt%, alkalinize it to a pH of 7.5, and filter to obtain a semi-finished product of refined glycerin;

[0024] S4. Put the refined glycerin semi-finished product obtained in S3 into a distillation kettle for vacuum distillation with a vacuum degree of 0.075 MPa. After collecti...

Embodiment 2

[0027] A process for refining biodiesel by-product crude glycerin, comprising the steps of:

[0028] S1. Add sulfuric acid solution with a concentration of 50 wt% to crude glycerin to acidify to pH 3, heat to 50° C., stir for 10 min, 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 35 wt%, add a high-efficiency alkalized adsorbent based on crude glycerin at 1 wt%, stir for 60 minutes, and then let stand and filter to obtain the primary product of refined glycerin;

[0030] S3. Preheat the refined glycerol primary product obtained in S2 to 60° C., add a sodium hydroxide solution with a concentration of 40 wt%, alkalinize it to a pH of 6.5, and filter to obtain a semi-finished product of refined glycerin;

[0031] S4. Put the refined glycerin semi-finished product obtained in S3 into a distillation pot for vacuum distillation with a vacuum degree of 0.095 MPa. Aft...

Embodiment 3

[0034] A process for refining biodiesel by-product crude glycerol, comprising the steps of:

[0035] S1. Add a sulfuric acid solution with a concentration of 45 wt% into crude glycerin to acidify to a pH of 3.5, heat to 40° C., stir for 20 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 30 wt%, add 5 wt% high-efficiency alkalized adsorbent based on crude glycerin, stir for 45 minutes, let it stand, and filter to obtain the primary product of refined glycerin;

[0037] S3. Preheat the refined glycerol primary product obtained in S2 to 70° C., add a sodium hydroxide solution with a concentration of 35 wt%, alkalinize it to a pH of 7, and filter to obtain a semi-finished product of refined glycerin;

[0038] S4. Put the refined glycerin semi-finished product obtained in S3 into a distillation kettle for vacuum distillation with a vacuum degree of 0.085 MPa....

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PUM

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Abstract

The invention discloses a refining process of a biodiesel by-product, namely crude glycerol. The refining process comprises the following steps: adding an acid solution into the crude glycerol and acidifying until the pH (Potential of Hydrogen) is 3 to 4; after heating to 30 DEG C to 50 DEG C, stirring for 10min to 30min; after standing and layering, removing upper-layer fatty acid; adding water and diluting until the water content is 25 weight percent to 35 weight percent; adding an efficient alkalization adsorbent and stirring for 30min to 60min; then standing and filtering; pre-heating to 60 DEG C to 80 DEG C; adding an alkaline solution and alkalifying until the pH is 6.5 to 7.5 and filtering; finally, conveying the solution into a distillation kettle and decompressing and distilling, wherein the vacuum degree is 0.075MPa to 0.095MPa; after collecting a fraction at 160 DEG C to 180 DEG C, cooling and condensing to obtain a refined glycerol finished by-product. The refining process of the biodiesel by-product, namely the crude glycerol, provided by the invention, can be used for efficiently preparing the glycerol finished by-product with the purity which is 99.5 percent or more; the production cost can be effectively reduced, and energy sources and resources are saved.

Description

technical field [0001] The invention relates to the technical field of glycerin refining, in particular to a process for refining crude glycerin, a by-product of biodiesel. 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. That is, while developing biodiesel, it is of great significance to co-p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/22C07C29/74C07C29/76B01J20/22B01J20/30
CPCB01J20/041B01J20/103B01J20/16B01J20/22C07C29/74C07C29/76C07C31/225
Inventor 祁建兵
Owner 天长市康宁甘油科技有限公司
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