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Method for synchronously preparing biodiesel and glycerol carbonate under acceleration action of methanol

A technology of glycerol carbonate and biodiesel, which is applied in the field of biodiesel preparation, can solve the problems of low yield, difficult separation of saponified products, long reaction time, etc., and achieves the effects of reducing process difficulty, low solubility, and reducing processing cost.

Inactive Publication Date: 2013-12-11
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there have been reports on the simultaneous preparation of biodiesel and glycerol carbonate by the reaction of natural oil and dimethyl carbonate, but the reaction time is long, the raw materials and products are easily saponified, the final yield is not high, and the saponified products are difficult to separate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Methanol promotes the method for synchronously preparing biodiesel and glycerol carbonate, comprising the following steps:

[0017] In the first step, add natural oil, dimethyl carbonate and methanol into the reaction kettle according to the ratio of the substance amount of 1:1:5. The natural oil is soybean oil after deacidification and dehydration, and the dimethyl carbonate and methanol are Chemically pure reagents after anhydrous treatment;

[0018] In the second step, add 10% alkali of natural oil quality into the reaction kettle under stirring, stir and heat at 90° C. for 6 hours, then cool to room temperature, and the alkali is industrial grade sodium hydroxide;

[0019] In the third step, the reactant in the reactor is filtered, washed with the dimethyl carbonate adopted in the first step until the filter residue is white, and the filtrate is obtained;

[0020] In the fourth step, excessive dimethyl carbonate and methanol in the filtrate are evaporated under red...

Embodiment 2

[0023] Methanol promotes the method for synchronously preparing biodiesel and glycerol carbonate, comprising the following steps:

[0024] In the first step, add natural oil, dimethyl carbonate and methanol into the reaction kettle according to the ratio of substance quantity of 1:1.1:6. The natural oil is rapeseed oil after deacidification and dehydration, dimethyl carbonate and methanol It is an analytically pure reagent after anhydrous treatment;

[0025] In the second step, add alkali with 10% natural oil quality to the reaction kettle under stirring, stir and heat at 90°C for 5 hours, then cool to room temperature, the alkali is industrial grade potassium carbonate and potassium hydroxide with a mass ratio of 1:1 mixture;

[0026] In the third step, the reactant in the reactor is filtered, washed with the dimethyl carbonate adopted in the first step until the filter residue is white, and the filtrate is obtained;

[0027] In the fourth step, excessive dimethyl carbonate...

Embodiment 3

[0030] Methanol promotes the method for synchronously preparing biodiesel and glycerol carbonate, comprising the following steps:

[0031] In the first step, add natural oil, dimethyl carbonate and methanol into the reaction kettle according to the ratio of the substance amount of 1:2:10. The natural oil is cottonseed oil after deacidification and dehydration, and the dimethyl carbonate and methanol are Chemically pure reagents after anhydrous treatment;

[0032] In the second step, add alkali of 8% natural oil quality to the reactor under stirring, stir and heat at 70°C for 5 hours, then cool to room temperature, and the alkali is a chemically pure barium hydroxide product;

[0033] In the third step, the reactant in the reactor is filtered, washed with the dimethyl carbonate adopted in the first step until the filter residue is white, and the filtrate is obtained;

[0034] In the fourth step, excessive dimethyl carbonate and methanol in the filtrate are evaporated under red...

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Abstract

The invention relates to a method for synchronously preparing biodiesel and glycerol carbonate under the acceleration action of methanol, which comprises the following steps: adding natural grease, dimethyl carbonate and methanol into a reaction kettle, adding alkali into the reaction kettle while stirring, heating while stirring, cooling to room temperature, filtering the reaction product in the reaction kettle, and washing with dimethyl carbonate until the filter residue is white, thereby obtaining a filtrate; evaporating the filtrate to remove excessive dimethyl carbonate and methanol under reduced pressure to obtain a light yellow liquid which is a biodiesel crude product; extracting the biodiesel crude product with methanol 2-3 times, wherein the residue is purified biodiesel; and merging the methanol solution, and evaporating to remove methanol to obtain the glycerol carbonate. The invention solves the problem of glycerol residues in the traditional biodiesel production process, and obtains the glycerol carbonate with high added value, thereby being beneficial to upgrading the biodiesel preparation technique; and the invention enhances the economic benefit of the biodiesel industry, and has the advantages of lower technical difficulty and lower processing cost.

Description

technical field [0001] The invention relates to the technical field of biodiesel preparation, in particular to a method for promoting synchronous preparation of biodiesel and glycerol carbonate by methanol. Background technique [0002] At present, my country's diesel consumption is about 90 million tons per year, largely dependent on imports. It is estimated that my country's diesel demand in 2012 will exceed 100 million tons. The sales price of biodiesel is about 5,000 yuan / ton. If the mixing ratio of diesel and biodiesel is 80:20 (that is, the B20 standard), the annual demand for biodiesel in my country is 18 million tons, and the total potential market is 90 billion yuan. . At present, my country's actual output has not exceeded 1 million tons per year. According to the national plan, it will reach 15 million tons by 2020. [0003] The in-depth development of glycerol, a by-product of the biodiesel industry, is also an important factor in promoting the coordinated deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/00C11C1/00C07D317/36
CPCY02E50/10Y02P30/20
Inventor 汤颖张洁王珊珊
Owner XI'AN PETROLEUM UNIVERSITY
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