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Ester interchange method for producing bio-diesel oil

A technology for transesterification and biodiesel, which is applied in the preparation of biological raw materials, biofuels, and liquid hydrocarbon mixtures, etc., can solve the problems of difficult recovery of esterification products, high catalyst price, and short catalyst life, so as to reduce production costs and reduce costs. Equipment investment, enhanced microscopic mass transfer effect, and the effect of avoiding catalyst separation

Active Publication Date: 2010-02-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High energy consumption and low yield
When molecular sieves are used as catalysts, the transesterification reaction needs to be carried out at a higher reaction temperature. At this time, methanol is in a vapor state, which is not conducive to the progress of the reaction.
No matter which catalyst is used, the above method has the following disadvantages: the process is complex, the alcohol must be excessive, and the subsequent process must have a corresponding alcohol recovery device, which requires high energy consumption; the product has a deep color, because the unsaturated fatty acids in the fat are easy to deteriorate at high temperatures; The esterification product is difficult to recycle and the cost is high; waste liquid is discharged during the production process
The disadvantages are: the conversion rate of oil is low; the service life of the enzyme is short; the product is difficult to separate from glycerin; the price of lipase is high; therefore, it has no industrial application value
Since this method can avoid or shorten the initial stage of transesterification, the reaction time is shortened, but the selectivity and conversion rate of the transesterification reaction are not greatly contributed; the reaction needs to be recycled, which increases energy consumption; the reaction process is selected The catalyst price is high; the transesterification reaction process itself generates water, and water is poisonous to the catalyst selected for the reaction, so the catalyst life is short; the catalytically active salt insoluble in the reaction mixture must be deposited on the carrier, and the catalyst preparation and / or separation process is complicated

Method used

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  • Ester interchange method for producing bio-diesel oil
  • Ester interchange method for producing bio-diesel oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add cottonseed oil in metering tank A, add methanol in metering tank B, the mol ratio of methanol and cottonseed oil is 10, the feed rate of cottonseed oil and methanol is equal to the effective volume of the transesterification reactor (that is, the feed volume space velocity is 1h -1 , that is, the reaction time is 1h), cottonseed oil and methanol are pumped into the transesterification reactor respectively, and the transesterification reaction is rapidly mixed with the circulating material in the transesterification reactor under the effect of ultrasonic waves, and the rate of the circulating material is 300% of the feed amount. Control the reaction temperature to 130° C., the reaction pressure to 0.8 MPa, the ultrasonic frequency to 15 kHz, and the power to 400 W / L of reaction material (the amount of reaction material is calculated according to the effective volume of the reactor, the same below). The reaction product flowing out from the discharge port of the tran...

Embodiment 2

[0033] According to the method of embodiment 1, just feed rate is 1 / 2nd of transesterification reactor effective volume, and circulating material rate is 400% of feed amount, and the frequency of ultrasonic wave is 30kHz, and power is 100W / L material. The reaction product flowing out from the reactor discharge port is separated by standing to obtain the fatty acid ester phase (upper layer). Utilizing the GC-14B gas chromatograph analysis of Daojin Company, the conversion rate of fatty acid triglyceride is 100%, and the fat The content of methyl ester in the ester phase is 92.8%.

Embodiment 3

[0035] According to the method of embodiment 1, the feed rate is 1 / 4 of the effective volume of the reactor, the circulating material rate is 200% of the feed amount, the frequency of the ultrasonic wave is 200kHz, and the power is 80W / L material. The reaction product flowing out from the discharge port of the transesterification reactor is separated by standing to obtain the fatty acid ester phase (upper layer), which is analyzed by the GC-14B gas chromatograph of Daojin Company, and the conversion rate of fatty acid triglyceride is 100%. , the content of methyl ester in the fatty acid ester phase is 89.5%.

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Abstract

The invention relates to a way to produce biological diesel oil through interesterification. The invention is to put animal oil (or vegetable oil) or ester and low-carbon alcohol into the reactor which is equipped with ultrasonic emission device and let them react under proper conditions. The invention can substantially increase the mass transferring process between alcohol and ester so as to shorten the reacting time and increase the transformation efficiency. Under malacopoeous conditions the invention also has very high transformation efficiency. Compared to the present technology, the invention has many advantages such as simple procedures, malacopoeous conditions, high transformation efficiency and fewer by-products. It can be used to produce biological diesel oil by different kinds of animal oil (or vegetable oil) or esters.

Description

technical field [0001] The invention relates to a method for producing biodiesel, in particular to a method for preparing biodiesel by transesterification. Background technique [0002] Fatty acid triglycerides, especially animal and vegetable fats and oils, monoglycerides obtained by transesterification with low molecular weight monohydric alcohols, have similar properties to diesel oil obtained from petroleum fractions, and can be used as fuels. The fuel obtained in this way is called biodiesel. [0003] The biodiesel produced by the transesterification reaction of oil has the following advantages: 1) It has excellent environmental protection characteristics. Biodiesel has low sulfur content and does not contain aromatic hydrocarbons that pollute the environment. 2) It has good engine low-temperature starting performance, and the condensation point without additives can reach -20°C. 3) It has good lubricating performance, which can reduce the wear rate of fuel injection...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 霍稳周黎元生于镝鸣陈明李花伊吕清林高飞
Owner CHINA PETROLEUM & CHEM CORP
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