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Method for preparing adhesive from biodiesel byproduct crude glycerine

A technology for biodiesel and crude glycerin, which is applied in the fields of adhesives, fatty acid production, chemical instruments and methods, etc., can solve the problems that the process of refining high-purity glycerol is complicated, it is difficult to afford the high cost of refining glycerol, and the cost is high, and it is convenient for large-scale production. , The effect of low production cost and strong water resistance

Inactive Publication Date: 2011-06-29
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the process of extracting high-purity glycerin from crude glycerin, a by-product of biodiesel production, is complicated and expensive, especially for small and medium-sized producers who can hardly afford the expensive cost of refining glycerin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Utilize the method that the by-product crude glycerin of tung oil produces biodiesel to prepare adhesive, its technological process is as follows:

[0020] Pretreatment of crude glycerol by-product of biodiesel: Prepare crude glycerol by-product in biodiesel from tung oil, dilute with methanol, the volume ratio of methanol and crude glycerin is 0.1:1, then slowly add sulfuric acid solution dropwise while stirring to adjust the above The pH value of the solution is up to 4, centrifuged, standing and stratified: the upper layer is a fatty acid layer, the lower layer is a saponified layer, the middle layer is a crude glycerin layer, the upper fatty acid layer is removed, the middle layer is recovered, methanol and water are evaporated to obtain pretreatment After crude glycerin;

[0021] Production of adhesive: N,N'-dimethylacetamide is added to the pretreated crude glycerin, the ratio of the mass of the pretreated crude glycerol to the volume of N,N'-dimethylacetamide is ...

Embodiment 2

[0025] Utilize the method for preparing adhesive by the by-product crude glycerin of soybean oil production biodiesel, its technological process is as follows:

[0026] Pretreatment of crude glycerol by-product of biodiesel: Prepare crude glycerol by-product in biodiesel from soybean oil, dilute with ethanol, the volume ratio of ethanol and crude glycerin is 0.18:1, then slowly add hydrochloric acid solution dropwise while stirring, adjust The pH value of the above solution is up to 5, centrifuged, standing and stratified: the upper layer is a fatty acid layer, the lower layer is a saponified layer, the middle layer is a crude glycerin layer, the middle layer is recovered, methanol and water are evaporated, and the pretreated crude glycerin is obtained ;

[0027] Production of adhesive: N,N'-dimethylacetamide is added to the pretreated crude glycerin, the ratio of the mass of the pretreated crude glycerin to the volume of N,N'-dimethylacetamide is 1: 1 g / mL, then add succinic...

Embodiment 3

[0031] Utilize waste oil to produce the method for tackiness agent by-product crude glycerol of biodiesel production, its technological process is as follows:

[0032] Pretreatment of biodiesel by-product crude glycerol: Dilute the by-product crude glycerol in biodiesel prepared from waste oil with water, the volume ratio of water and crude glycerin is 0.25:1, slowly add phosphoric acid solution dropwise while stirring, and adjust the concentration of the above solution When the pH value reaches 6, centrifuge and stand for stratification: the upper layer is a fatty acid layer, the lower layer is a saponified layer, and the middle layer is a crude glycerin layer. The middle layer is recovered, methanol and water are evaporated to obtain pretreated crude glycerin;

[0033] Production of the adhesive: add N,N'-dimethylacetamide to the pretreated crude glycerol, the ratio of the mass of the pretreated crude glycerin to the volume of N,N'-dimethylacetamide is 2: 1 g / mL, then add su...

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Abstract

The invention relates to a method for preparing adhesive from biodiesel byproduct crude glycerine, which comprises the following steps: pretreatment of byproduct crude glycerine: by using the byproduct crude glycerine in the biodiesel production process as a raw material, adding a diluter to dilute the crude glycerine, regulating the pH value of the solution to 3-6, centrifugalizing and standing to stratify, wherein the upper layer is a fatty acid layer, the lower layer is a saponified substance layer, and the middle layer is a crude glycerine layer; taking the middle layer, and evaporating to remove methanol and water, thereby obtaining pretreated crude glycerine; and production of adhesive: adding an N,N'-dimethyl acetamide solvent into the pretreated crude glycerine, adding butanedioic anhydride, heating to dissolve the butanedioic anhydride, and reacting to obtain the adhesive, wherein the mol ratio of the butanedioic anhydride to the pretreated crude glycerine is 1:1-2:1. The method is suitable for the preparation of the byproduct crude glycerine of biodiesel from various kinds of animal and vegetable grease, and has the advantage of low production cost; the technique is simple and convenient for implementing large-scale production; and the prepared adhesive has the advantages of high adhesive strength and high water resistance.

Description

technical field [0001] The invention relates to a method for preparing an adhesive by using biodiesel by-product crude glycerin, which is suitable for producing biodiesel by-product crude glycerin from various animal and vegetable oils. Background technique [0002] With the depletion of petroleum resources and the aggravation of environmental pollution, choosing clean and renewable energy has become the focus of current energy research. As a high-quality substitute of petrochemical diesel, biodiesel can not only reduce the environmental pollution caused by the combustion of fossil fuels, but also alleviate the pressure brought by my country's energy shortage to a certain extent. About 10% of by-product crude glycerol is produced during the production of biodiesel, but the crude glycerin is of low value because of impurities. Making full use of the by-product crude glycerol in the biodiesel production process can not only reduce the production cost, but also increase the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J167/00C11C3/00C11D13/00
Inventor 刘慧李翠
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)