Process for preparing biodiesel

A technology of biodiesel and process method, which is applied in the field of biodiesel synthesis, and can solve the problems of solid base catalyst loading, recovery and activation, high requirements for equipment in the production process, and high molar ratio of alcohol to oil, so as to shorten the reaction time and improve the conversion rate High, the effect of reducing industrial wastewater

CN101177617BInactive Publication Date: 2010-11-10BEIJING UNIV OF CHEM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2010-11-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a technique used for preparing biodiesel, which takes rough vegetable oil and industrial methanol as raw materials and employs compound basic catalyst to carry out ester exchange reaction, and reaction pressure is 0.2MPa to 0.5MPa, reaction temperature is 70 DEG C to 140 DEG C and reaction time is 3 to 50 minutes; the materials after reaction go through sedimentation, flash vaporization and rectification under vacuum and then treatment technique acquired biodiesel products. The preparation method of the invention can effectively improve the speed of the ester exchangereaction, shorten reaction time, does not need to refine the raw materials and has simple technique, furthermore, reaction condition is moderate, the catalyst quantity used is small, conversion ratiois high and post treatment does not produce a great deal of waste water. The highest conversion ratio of the raw materials reaches 99 percent, and the purity, dynamic viscosity, acid value, octane number, glycerin content, saponification number, etc. of the obtained biodiesel all meet to standards of 0 model biodiesel.
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Description

A process for preparing biodiesel technical field The invention relates to a process for producing biodiesel by transesterification, in particular to a method for synthesizing biodiesel under alkali catalysis by using crude vegetable oil and industrial methanol as raw materials. Background technique At present, biodiesel is mainly produced by the transesterification reaction of animal and vegetable oils and some short-chain hydrocarbons (methanol, ethanol, etc.) under acid, base catalysis, enzyme catalysis or supercritical conditions. The traditional transesterification reaction uses strong acid and strong base homogeneous catalysts, and the reaction is carried out under the conditions of normal pressure and about 60°C (below the boiling point of methanol). The reaction conditions are mild, but the reaction time often takes more than 1 hour. The conversion rate of oil to reach 95%. Wherein strong acid is used as catalyst, because the reaction speed is slow, is generally ...

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