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A kind of preparation method of biodiesel

A biodiesel and glycerin technology, which is applied in the preparation of liquid hydrocarbon mixtures, biological raw materials, biofuels, etc., can solve the problems of high equipment requirements and harsh reaction conditions, and achieve no three wastes emissions, reduced equipment investment, and omits pretreatment The effect of the process

Active Publication Date: 2012-02-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method has harsh reaction conditions and requires high equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Grease and methanol with an acid value of 104.7 mgKOH / g are supplied to the preheater at a rate of 600 g / h and 100 g / h respectively, and the liquid hourly space velocity is 0.6h -1 , the temperature of the preheater is 160°C, and the preheated material is continuously supplied to the tubular reactor, the reaction temperature is 200-205°C, the pressure is 2.0-2.5MPa, the crude reaction product enters the flash tower, and at -1 , separate the mixed ester phase, the triglyceride content in the mixed ester phase is 2.4w%, the mixed ester phase enters the thin film evaporator, and under the conditions of pressure 6mmHg and temperature 240°C, biodiesel is distilled out with a yield of 85.2w%.

Embodiment 2

[0026] Grease and methanol with an acid value of 58.1mgKOH / g are supplied to the preheater at a rate of 600g / hour and 100g / hour respectively, and the liquid hourly space velocity is 0.7h -1 , the temperature of the preheater is 160°C, and the preheated material is continuously supplied to the tubular reactor, the reaction temperature is 220°C, and the pressure is 5.5-6.0MPa. °C to remove methanol and recover methanol for reuse. The remaining material enters the fiber bundle separator at a temperature of 30°C and a liquid hourly space velocity of 10h -1 Under the conditions, the mixed ester phase and the glycerin phase are continuously separated, the triglyceride content in the ester phase is 0, and the mixed ester phase enters the vacuum distillation column. Under the conditions of pressure 11mmHg, tower kettle 267 °C, and reflux ratio 3:1, The biodiesel is distilled with a yield of 93w%.

Embodiment 3

[0028] Grease and methanol with an acid value of 49.3 mgKOH / g are supplied to the preheater at a rate of 600 g / h and 110 g / h respectively, and the liquid hourly space velocity is 0.6h -1 , the temperature of the preheater is 140°C, and the preheated material is continuously supplied to the tubular reactor, the reaction temperature is 200-205°C, the pressure is 3.5-4MPa, the reaction crude product flowing out of the reactor enters the flash tower, and -1 , separate the ester phase, the content of triglyceride in the ester phase is 1.25w%, the ester phase enters the vacuum rectification tower, under the conditions of pressure 15mmHg, tower kettle 279 ℃, reflux ratio 0.6:1, biodiesel is distilled, and the The rate can reach 88.2w%.

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Abstract

The invention relates to a preparation method for biological diesel oil, which comprises that: grease and alcohol are provided to a reactor for the transesterification; the biological oil and glycerol are separated and collected. The reaction temperature is 100-260 DEG C, and the reaction pressure is 0.2-7MPa. According to the method provided by the invention, the product yield can reach to more than 80w percent. The method of the invention is especially applied to the processing of unrefined oil with high acid value. Pretreatment process with complex procedures can be avoided, and the energy consumption and the equipment investment can be lowered. Without the three wastes, the method of the invention is an environmental friendly green process.

Description

technical field [0001] The invention relates to a method for preparing biodiesel by reacting oil and monoalcohol. Background technique [0002] Biodiesel can be obtained through the transesterification reaction of fats, triglycerides and low-carbon alcohols. The reaction products include fatty acid esters, monoglycerides, diglycerides, glycerol, alcohols and unreacted triglycerides, which can be obtained by separation Biodiesel, which is mainly fatty acid esters, also contains small amounts of monoglycerides and diglycerides. [0003] The preparation methods of biodiesel can be divided into acid catalysis, base catalysis, enzyme catalysis and supercritical method. [0004] CN1412278A discloses a kind of acid catalysis method, the method for preparing biodiesel with high acid value waste animal and vegetable oil, it uses sulfuric acid as catalyst, carries out according to the procedure of raw material dehydration, esterification and transesterification, phase separation, dec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G3/00C11C3/10
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 王海京杜泽学闵恩泽高国强阳国军
Owner CHINA PETROLEUM & CHEM CORP