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Method for preparing biodiesel

A biodiesel and oil technology, applied in biofuels, petroleum industry, liquid carbonaceous fuels, etc., can solve the problems of long processing flow, difficult separation of fatty acid ester layer and glycerin layer, and large amount of acid catalysts, etc. The effect of reducing the production of soap

Active Publication Date: 2016-06-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem with the acid-catalyzed pre-esterification-base-catalyzed process compared with the base-catalyzed process is that the amount of acid catalyst used is large, generally 1% to 3% of oil, or even More, a large amount of waste acid seriously pollutes the environment
The pre-esterification process makes the processing process longer, equipment investment and energy consumption increase
[0006] JP9-235573 discloses a kind of use of waste cooking oil and methanol to prepare diesel fuel in the presence of sodium hydroxide, but in natural oils and fats, free fatty acids are usually contained, In the case of more free fatty acids, the use of alkali metal catalysts will produce fatty acid soaps, so the alkali metal catalysts will be excessive and it will be difficult to separate the fatty acid ester layer from the glycerin layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add waste oil and methanol with an acid value of 29mgKOH / g into the autoclave together, the mass ratio of alcohol to oil is 0.17:1, add zinc hydroxide with a weight of 0.6% of the grease as a catalyst, and stir in the autoclave at a temperature of 140°C and a pressure of 0.7Mpa. Under the condition of a speed of 200 rpm, react for 3.5 hours to obtain a crude reaction product for distillation, remove excess methanol at the bottom of the kettle < 150°C, recover and reuse methanol, and separate the remaining materials into the glycerin phase. The mixed ester phase was distilled under reduced pressure to obtain biodiesel with a yield of 95.1% and an acid value of 3.6 mgKOH / g.

Embodiment 2

[0024] Add waste oil with an acid value of 66mgKOH / g and methanol together into the autoclave, the mass ratio of alcohol to oil is 0.20:1, add zinc hydroxide with a weight of 0.9% of the grease as a catalyst, and stir in the autoclave at a temperature of 120°C and a pressure of 0.4Mpa. Under the condition of a speed of 200 rpm, react for 3.5 hours to obtain a crude reaction product for distillation, remove excess methanol at the bottom of the kettle < 150°C, recover and reuse methanol, and separate the remaining materials into the glycerin phase. The mixed ester phase was distilled under reduced pressure to obtain biodiesel with a yield of 93.5% and an acid value of 0.97 mgKOH / g.

Embodiment 3

[0028] Add waste oil and methanol with an acid value of 66mgKOH / g into the autoclave together, the mass ratio of alcohol to oil is 0.20:1, add zirconium hydroxide with 0.9% of the weight of grease as a catalyst, and stir in the autoclave at a temperature of 140°C and a pressure of 0.7Mpa. Under the condition of a speed of 200 rpm, react for 3.5 hours to obtain a crude reaction product for distillation, remove excess methanol at the bottom of the kettle < 150°C, recover and reuse methanol, and separate the remaining materials into the glycerin phase. The mixed ester phase was distilled under reduced pressure, and the yield of biodiesel was 49%.

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PUM

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Abstract

The invention provides a method for preparing biodiesel; the method adopts a relatively weak acidic or relatively weak alkaline compound and an amphoteric compound as catalysts, and the high-yield biodiesel can be obtained by a one-step reaction. The method for preparing the biodiesel includes the steps: under an action of transition metal catalysts containing hydroxyl and / or carbonate, mixing grease and C1-C6 monohydric alcohol, carrying out a reaction under conditions of the reactor temperature of 100-300 DEG C and the pressure of 0.1-10 MPa, and separating fatty acid ester from the material after the reaction.

Description

field of invention [0001] The invention relates to a method for preparing fatty acid monoalkyl ester (ie, biodiesel) by reacting oil and monohydric alcohol. Background technique [0002] Biodiesel can be produced by transesterification of oil and monohydric alcohol, and the reaction products include fatty acid monoalkyl esters, monoglycerides, diglycerides, glycerol, and unreacted alcohols and oils (ie triglycerides). [0003] DE3444893 discloses a pre-esterification-alkali-catalyzed method. First, an acid catalyst is used under normal pressure at 50-120° C. to esterify free fatty acids and alcohols, and the oil is subjected to pre-esterification treatment. The transesterification reaction is carried out, but the remaining acid catalyst will be neutralized by alkali, and the amount of alkali metal catalyst will increase. [0004] CN1031070C adopts pre-esterification-alkali catalysis method, first use concentrated sulfuric acid, phosphoric acid or p-toluenesulfonic acid, tol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/10C10L1/02
CPCY02E50/10
Inventor 王海京杜泽学高国强
Owner CHINA PETROLEUM & CHEM CORP