Method of preparing organism diesel oil from mixing plant oil

A technology of mixing plants and biodiesel, which is used in the preparation of liquid hydrocarbon mixtures, biological raw materials, biofuels, etc., can solve the problems of long reaction time, expensive enzymes, easy inactivation, etc., and achieves strong adaptability of raw materials, convenient switching, Yield-enhancing effect

Active Publication Date: 2007-03-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of using enzyme catalysts are: long reaction time, low efficiency, expensive enzymes, and easy inactivation during the reaction
[0007] CN1111591C discloses a method for preparing fatty acid ester by reacting oil and monohydric alcohol. The method includes reacting methanol with oil to obtain fatty acid ester. At 280°C and 12Mpa, the formation rate of fatty acid methyl ester is 60%. The patent How to deal with monoglycerides, diglycerides and triglycerides in the crude product after the reaction is not disclosed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The crude vegetable oil containing 1.2% of unsaponifiable matter and the acid value of 72mgKOH / g is mixed with the rapeseed oil of Comparative Example 2 in a weight ratio of 0.3:1, and the mixed oil is continuously at a rate of 60 g / hour and an alcohol-oil molar ratio of 7. It is continuously supplied to the tubular reactor, the temperature in the reactor is 270-280°C, and the pressure is 8Mpa. After the crude reaction product is separated from methanol and glycerol, fatty acid methyl esters are distilled under reduced pressure and the yield of fatty acid methyl esters is 92.2wt%. , the acid value is 3.5mgKOH / g. The residual liquid at the bottom of the kettle can be recycled as a raw material to the feed port of the reactor for secondary reaction.

[0029] Under the same conditions, the crude vegetable oil with an acid value of 72 mgKOH / g was used as the raw material, the yield of fatty acid methyl ester was 87.2 wt%, and the acid value was 9.0 mgKOH / g.

Embodiment 2

[0031] The crude vegetable oil containing 1.5% unsaponifiable matter and the acid value of 52 mgKOH / g is mixed with the refined soybean oil in Comparative Example 1 at a weight ratio of 1:1, and the mixed oil is provided at a rate of 60 g / hour and an alcohol-to-oil molar ratio of 5. In the tubular reactor, the temperature in the reactor is 270-280 ℃, and the pressure is 8.5Mpa. After the crude product of the reaction is separated from methanol and glycerin, fatty acid methyl esters are distilled under vacuum rectification, and the yield of fatty acid methyl esters is 91±1wt%, The acid value is 3.3 mgKOH / g, and the residual liquid at the bottom of the kettle can be recycled as a raw material to the feed port of the reactor for secondary reaction.

[0032] Under the same conditions, the crude vegetable oil with an acid value of 52 mgKOH / g was used as the raw material, the yield of fatty acid methyl ester was 86 wt%, and the acid value was 7.2 mgKOH / g.

Embodiment 3

[0034] The crude vegetable oil with an acid value of 28.5mgKOH / g is mixed with soybean oil and rapeseed oil in a weight ratio of 1:1:1, and the mixed oil is continuously supplied to the pipe at a rate of 60 g / hour and a molar ratio of alcohol to oil of 5. In the reactor, fatty acid methyl ester was prepared under the conditions of reactor temperature of 320 ° C and pressure of 9 Mpa. The yield of fatty acid methyl ester was 83.9 wt%, and the acid value was less than 2.0 mgKOH / g. The feed port of the reactor is used for secondary reaction.

[0035] Under the same conditions, the crude vegetable oil with an acid value of 28.5 mgKOH / g was used as the raw material, the yield of fatty acid methyl ester was 84.2 wt%, and the acid value was 4.7 mgKOH / g.

[0036] Under the same conditions, soybean oil and rapeseed oil were used as raw materials, and the yields of fatty acid methyl esters were 69wt% and 76wt%, respectively.

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Abstract

The invention discloses a preparing method of biological diesel based on composite plant oil as raw material, which is characterized by the following: blending low-acid plant oil with acid less than 5mgKOH / g, crude oil with acid value at 20-110mgKOH / g and C1-8 monohydric alcohol; reacting at 200-320 deg.c under 5-12Mpa; setting the molar rate of alcohol and oil at 3-60:1; collecting fatty acid ester; setting the weight rate of low-acid plant oil and crude oil at 1:0.02-50.

Description

Field of Invention [0001] The present invention relates to a method for preparing biodiesel by reacting grease and monohydric alcohol. Background technique [0002] Biodiesel can pass oil and C 1 -C 8 The monohydric alcohol is obtained by transesterification, which refers to triglyceride and another alcohol (usually a lower alcohol, such as C 1 -C 8 of the monohydric alcohol). Among its reaction products are fatty acid esters, namely biodiesel, monoglyceride, diglyceride, glycerol, alcohol and triglyceride as raw materials. The preparation methods of biodiesel can be divided into acid catalysis method, alkali catalysis method, enzyme catalysis method and supercritical method. [0003] CN1473907A uses the scraps of vegetable oil refining and edible recovered oil as raw materials, and the catalyst is compounded by inorganic and organic acids such as sulfuric acid, hydrochloric acid, p-toluenesulfonic acid, dodecylbenzenesulfonic acid, and naphthalenesulfonic acid. Contin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 王海京闵恩泽杜泽学吴巍李蓓高国强胡见波
Owner CHINA PETROLEUM & CHEM CORP
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