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Process for preparing biological diesel oil

A process method, biodiesel technology, applied in the petroleum industry, biological raw materials, biofuels, etc., can solve the problems of long reaction time, easy inactivation, expensive enzymes, etc., and achieve favorable environmental protection, equipment investment reduction, and no three wastes discharge Effect

Active Publication Date: 2007-11-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the reaction conditions are mild with enzyme catalysts, the disadvantages are long reaction time, low efficiency, solvents are needed, enzymes are expensive, and are easily inactivated in high-purity methanol
[0008] PCT / JP99 / 0543 discloses a method for preparing fatty acid ester by reacting oil and monohydric alcohol. At 270-280°C and 11-12MPa, methanol is reacted with oil, and the formation rate of fatty acid methyl ester is 55-60%. The patent does not disclose the separation scheme of the crude product after the reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Unrefined vegetable oil and methanol with a triglyceride content of 72m% and an acid value of 52mgKOH / g are supplied to the preheater at a rate of 600 g / h and 152 g / h respectively, and the liquid hourly space velocity is 1.2h -1, The preheater temperature is 200℃, and the preheated materials are continuously supplied to the tubular reactor. The temperature in the reactor is 270℃, the pressure is 7MPa, the reaction conversion rate is nearly 100%, and the flow rate of the material flowing out of the reactor is 752 g / After hours, the crude reaction product enters the flash tower, where methanol is removed at -1 , Separate the ester phase, the ester phase enters the vacuum rectification tower, under the conditions of 8mmHg vacuum, 289°C in the tower, and 0.7:1 reflux ratio, fatty acid methyl esters are obtained from the top of the tower, with a purity of >99.0%, and the bottom of the kettle enters Molecular rectification device, at a residual pressure of 5-6Pa and heating surf...

Embodiment 2

[0036] Unrefined vegetable oil and methanol with a triglyceride content of 93m% and an acid value of 9mgKOH / g are supplied to the preheater at a rate of 600 g / h and 200 g / h, with a liquid hourly space velocity of 1.2h -1 , The preheater temperature is 200℃, and the preheated materials are continuously supplied to the tubular reactor. The temperature in the reactor is 290℃, the pressure is 10MPa, the reaction conversion rate is nearly 100%, and the flow rate of the material flowing out of the reactor is 800 g / After hours, the crude reaction product enters the flash tower, where methanol is removed at -1 , Separate the mixed ester phase, and enter the thin film evaporator. Under the conditions of vacuum degree of 7mmHg and temperature of 242°C, the fatty acid methyl esters are distilled out with a purity of more than 99.0%. 2±1Pa, at 240~250℃ on the heating surface, light distillate is distilled out. This part of the material can be recycled to the reactor feed port as raw material...

Embodiment 3

[0038] The oil and methanol with a triglyceride content of 77m% and an acid value of 42mgKOH / g are supplied to the preheater at a rate of 600 g / h and 239 g / h, respectively, and 0.01% KOH of the oil weight is added, liquid hourly space velocity 1.2h -1 , The preheater temperature is 200℃, and the preheated materials are continuously supplied to the tubular reactor. The temperature in the reactor is 260℃, the pressure is 9MPa, and the reaction conversion rate is 100%. The crude product flowing out of the reactor enters the flash evaporation The tower removes methanol at -1 Under the conditions, the mixed ester phase and the glycerin phase are continuously separated, and the mixed ester phase enters the vacuum distillation tower. Under the conditions of a vacuum of 10mmHg, a bottom of 280°C, and a reflux ratio of 3:1, the fatty acid methyl ester is evaporated from the top of the tower. With a purity of ≥99.5%, the bottom of the kettle enters the molecular rectification device. At a r...

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PUM

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Abstract

The invention discloses a method of fabricating biofuel. The steps are as follies: (1). Put oil and fat and alcohol into the reaction kettle for easer interchange polymerization. (2). Distill monohydroxy-alcohol from the reaction mess. (3). Separate the mixed ester and progeny hydrate. (4). Distill the mixed ester and propeny hydrate separately, and get high purity fatty acid ester and high purity propeny hydrate. According to the method, the percentage conversion could be 100%.After certificating under vacuum, the purity of top fatty acid monoester could be above 99%. The method of this invention applied all kinds of refining oil and unrefining oil, and basically has no waste stock, waste water and waste gas. It is a green method for environment.

Description

Technical field [0001] The invention relates to a method for preparing fatty acid esters by reacting fats and oils with monohydric alcohols. Background technique [0002] Biodiesel can be prepared by transesterification reaction between oil and methanol. The transesterification reaction refers to the triglyceride and another alcohol (usually a lower alcohol, such as C 1 -C 8 的monohydric alcohol) to carry out the reaction. Its reaction products include fatty acid esters, namely biodiesel, monoglycerides, diglycerides, glycerol, alcohols and triglycerides as raw materials. Its preparation method can be divided into acid catalysis method, alkali catalysis method, enzyme catalysis method and supercritical method. [0003] CN1412278A discloses an acid catalysis method, a method for preparing biodiesel from waste animal and vegetable oils with high acid value. It uses sulfuric acid as a catalyst and is carried out in accordance with the procedures of dehydration, esterification and tra...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 王海京杜泽学闵恩泽江雨生李蓓高国强
Owner CHINA PETROLEUM & CHEM CORP
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