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Treatment method of glycerol as by-product of biodiesel

A treatment method, biodiesel technology, applied in chemical instruments and methods, preparation of organic compounds, separation/purification of hydroxyl compounds, etc., can solve the problems of high energy consumption, unfavorable industrial application, complicated process, etc., and achieve low energy consumption , simple steps, low energy consumption

Active Publication Date: 2016-05-18
SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this scheme can have a certain effect on the refining of glycerin, the process is too complicated. A large amount of water is added to the glycerin system through the ion exchange process, and the water must be removed through the rectification process. Not good for industrial applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) 100 mL of by-product glycerol from the above tung oil biodiesel was heated in a water bath to 70°C; the pH was adjusted to 5.0 with 10 mol / L sulfuric acid; it was left to stand in a separatory funnel for 10 hours, and the clear liquid was removed.

[0034] (2) Add 20 mL of methanol to the lower phase glycerin clear solution obtained in step (1), mix well and let stand for 2 hours.

[0035] (3) Centrifuge the solution obtained in step (2) at 10,000 rpm for 25 min to remove the precipitate and take the supernatant.

[0036] (4) Add the glycerin clear solution obtained in step (3) into 15mL of water, mix well, and perform electrodialysis. When the conductivity is less than 100μs / cm, the supernatant is collected for rectification.

[0037] (5) Distill the glycerin clear liquid obtained in step (4) under atmospheric pressure, and collect the still residue at 85°C.

[0038]Experimental results: The glycerol clear liquid obtained in step (3) was analyzed by gas quality, ...

Embodiment 2

[0040] (1) 5L of glycerol by-product of the above-mentioned tung oil biodiesel was heated in a water bath to 60°C; the pH was adjusted to 5.5 with 10mol / L hydrochloric acid; it was left to stand in a separatory funnel for 15 hours, and the clear liquid was removed.

[0041] (2) Add 700 mL of methanol to the lower phase glycerin clear solution obtained in step (1), mix well and let stand for 5 hours.

[0042] (3) Centrifuge the solution obtained in step (2) at 15000 rpm for 10 min to remove the precipitate and take the supernatant.

[0043] (4) Add the glycerin clear solution obtained in step (3) into 700mL of water, mix well, and then perform electrodialysis. When the conductivity is less than 100μs / cm, the supernatant is collected for rectification.

[0044] (5) Distill the glycerin clear liquid obtained in step (4) under atmospheric pressure, and collect the still residue at 85°C.

[0045] Experimental results: The glycerin clear liquid obtained in step (3) was analyzed by...

Embodiment 3

[0047] (1) 10L of glycerol by-product of the tung oil biodiesel was heated in a water bath to 80°C; the pH was adjusted to 4 with 10mol / L phosphoric acid; it was left to stand in a separatory funnel for 15 hours, and the clear liquid was removed.

[0048] (2) Add 3 L of ethanol to the lower phase glycerin clear solution obtained in step (1), mix well and let stand for 5 hours.

[0049] (3) Centrifuge the solution obtained in step (2) at 10,000 rpm for 20 min to remove the precipitate and take the supernatant.

[0050] (4) Add the glycerin clear solution obtained in step (3) into 1.6L of water, mix well, and perform electrodialysis operation. When the conductivity is less than 100μs / cm, the supernatant is collected for rectification.

[0051] (5) Distill the glycerin clear liquid obtained in step (4) under atmospheric pressure, and collect the still residue at 85°C.

[0052] Experimental results: The glycerin clear liquid obtained in step (3) was analyzed by gas quality, and ...

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Abstract

The invention discloses a treatment method of glycerol as a by-product of biodiesel. The treatment method includes the following steps: 1) acidifying the glycerol as the a by-product of the biodiesel, allowing the by-product glycerol to stand for layering, and obtaining a subnatant; 2) adding organic alcohol to the subnatant, uniformly mixing the liquid, and performing solid-liquid separation to obtain a glycerol clear liquid; 3) adding water to the glycerol clear liquid to dilute the glycerol clear liquid, performing electrodialysis desalination, and then rectifying the liquid and collecting a bottom residue which is the product. The glycerol product can be used for microorganism fermentation. The treatment method is simple in process and is easy to achieve industrial application.

Description

technical field [0001] The invention belongs to the field of biochemical industry, and relates to a treatment method for producing glycerol by-product of biodiesel, and the processed product can be applied to microbial fermentation. Background technique [0002] The by-product glycerol is produced in the production process of biodiesel. With the large-scale development of biodiesel, the rational utilization of by-product glycerol has become one of the key issues in the development of biodiesel industry. The effective reuse of crude glycerol is beneficial to reduce the production cost of biodiesel and solve the problem of environmental pollution. [0003] Crude glycerin can be converted into 1,3-propanediol, epichlorohydrin, lactic acid, polyhydroxyalkanoate, dihydroxyacetone and 1,2-propanediol and other high value-added products with market prospects through various process routes. Currently, the crude glycerol utilization process routes with relatively mature technology a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/22C07C29/74C07C29/76C07C29/88
Inventor 张霖樊亚超廖莎姚新武师文静
Owner SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD
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