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Method of preparing fatty acid ester

A technology of fatty acid ester and oil, which is applied in the field of fatty acid ester preparation, can solve the problems of unexplained reaction effect, slow reaction speed, low yield of fatty acid ester, etc., and achieve the effect that is beneficial to the acid value of the product

Active Publication Date: 2009-10-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem of acid catalysis compared with base catalysis is that the reaction speed is slow, a large amount of waste acid will be produced, and the environment will be polluted.
The disadvantages of using enzyme catalysts are: long reaction time, low efficiency, expensive enzymes, and easy inactivation in high-purity methanol
[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. Under the conditions of 270-280°C and 11-12Mpa, the formation rate of fatty acid methyl ester is 55%. ~60%, it can be seen from this patent that the formation rate of fatty acid methyl ester is low, and there is no disclosure on how to deal with monoglyceride, diglyceride and triglyceride in the crude reaction product
[0008] Can find by above-mentioned prior art, adopt the problem that the yield of fatty acid ester is lower in adopting continuous middle and high pressure method
In addition, the above method does not explain the reaction effect of the treatment of unrefined oil with high acid value and high unsaponifiable matter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Using vegetable oil with an acid value of 1.4mgKOH / g as raw material, the alcohol-oil molar ratio is 5, and the liquid hourly space velocity is 1.2h -1 Under certain conditions, it is continuously provided in the tubular reactor, and NaOH with a weight of 0.01% of the oil weight is added, the temperature in the reactor is 260-270°C, the pressure is 8Mpa, the reaction conversion rate of oil and ester is 100w%, and the yield of fatty acid methyl ester is 97±1w%.

Embodiment 2

[0026] Using vegetable oil with an acid value of 1.2mgKOH / g as raw material, the molar ratio of alcohol to oil is 5, and the liquid hourly space velocity is 7h -1 Under the condition of condition, provide in the tubular reactor continuously, add the NaOH that weight is 0.01% of fat weight, temperature 260~270 ℃ in the reactor, pressure 8Mpa, oily ester reaction conversion rate 100w%, reaction crude product is reduced Fatty acid methyl ester is distilled out by pressure rectification, and the yield of fatty acid methyl ester is 94w%.

[0027] The residual liquid at the bottom of the rectification tank contains fatty acid methyl ester, monoglyceride, and diglyceride, which can be recycled to the feed port of the reactor as raw material, mixed with fresh raw material and reused.

Embodiment 3

[0029] Using crude vegetable oil with an acid value of 44mgKOH / g as raw material, the molar ratio of alcohol to oil is 5.2, and the liquid hourly space velocity is 1.2h -1 Under certain conditions, it is continuously provided in the tubular reactor, and NaOH with a weight of 0.01% of the oil weight is added. The temperature in the reactor is 260-270°C, the pressure is 8-9Mpa, the oil-ester reaction conversion rate is 100w%, and the reaction crude product The acid value of the separated ester phase is 2.1mgKOH / g, and the reaction crude product is distilled out of fatty acid methyl ester through vacuum distillation, and the yield of fatty acid methyl ester is 95-96w%.

[0030] The residual liquid at the bottom of the rectification tank contains fatty acid methyl ester, monoglyceride, and diglyceride, which can be recycled to the feed port of the reactor as raw material, mixed with fresh raw material and reused.

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Abstract

The invention relates to a method for preparing fatty acid ester, comprising: mixing oil with C1-C6 monohydric alcohol and basic compound, reacting at a temperature of 200-300°C and a pressure of 5-12Mpa, and separating the fatty acid ester from the reacted material Fatty acid ester, the basic compound is selected from one of the hydroxides, alcoholates, oxides, carbonates, bicarbonates, C12~C24 fatty acid salts of IA and II A elements in the periodic table or Various, the addition amount of basic compound is 0.005~0.08% of fat weight. The method of the invention solves the problem of low yield of fatty acid ester prepared by the existing medium-pressure and high-pressure continuous flow method, and the yield of fatty acid ester can reach 94-97%, and the color of the reacted material is comparable to that of the raw material oil. Deepened, no carbon deposits or coke were found in the reactor.

Description

field of invention [0001] The invention relates to a method for preparing fatty acid ester (ie, biodiesel) by reacting oil and monohydric alcohol. Background technique [0002] Biodiesel can be produced by transesterification of oils and monohydric alcohols. The reaction products include fatty acid esters, monoglycerides, diglycerides, glycerol, and unreacted alcohols and oils (ie triglycerides). In the prior art, the preparation methods of biodiesel can be divided into acid catalysis, base catalysis, enzyme catalysis and supercritical method. [0003] CN1473907A uses vegetable oil refining leftovers and edible recovered oil as raw materials. The catalyst is compounded by sulfuric acid, hydrochloric acid, p-toluenesulfonic acid, dodecylbenzenesulfonic acid, naphthalenesulfonic acid and other inorganic and organic acids. After acidification, impurity removal, Continuous dehydration, esterification, layering, vacuum distillation and other processes are used for production. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/03C11C3/10
Inventor 王海京闵恩泽杜泽学吴巍李蓓高国强
Owner CHINA PETROLEUM & CHEM CORP