Method for purifying biodiesel

A biodiesel and vegetable oil technology, applied in biofuel, petroleum industry, fat production, etc., can solve the problems of high recovery cost, complex process, waste of water resources, etc., to save water treatment costs, simple process flow, and reduce equipment consumption amount of effect

Active Publication Date: 2014-03-12
中青能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The obtained biodiesel has the following problems: 1. it is difficult to thoroughly remove impurities by using a water washing process, the recovery rate of methanol is low and the process is complicated, and the content of the product fatty acid methyl ester is relatively low, generally less than 98%. The application range of biodiesel is limited to a certain extent, for example, it cannot be used in high-end automobiles, but can only be used in industries with relatively low requirements such as industrial boilers and agricultural machinery; Severe pollution and waste of water resources, if the recovery of methanol or ethanol is costly; ③After washing with water, the product needs to be dried through a drying tower, which increases equipment costs and processing costs; ④Washing process removes most of the impurities (methanol, glycerin etc.), but also take away part of the methyl ester, so that the output rate is reduced
Although the shortcomings of the above-mentioned processes are overcome, rectification or flash distillation has high requirements on equipment and consumes a lot of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Coconut oil and methanol are used for ester substitution reaction, and the molar ratio of coconut oil and methanol is 1:7. The reaction product is stratified by static, the supernatant (crude methyl ester) is cooled to 0°C and filtered to remove the filter residue, and the filter residue is re-entered into the ester substitution reaction kettle, and the filtrate is passed into the secondary adsorption column. The primary adsorption column is equipped with 4A molecular sieve. The secondary adsorption column is equipped with ITQ-4 molecular sieve, pressurized (2 standard atmospheric pressure) to make the crude methyl ester pass through the two-stage adsorption column to obtain purified biodiesel. Take out the 4A molecular sieve from the primary adsorption column and heat it above 65°C to recover methanol. Soak the filler (adsorption resin) in the secondary adsorption column in water for 3 hours and then dry it at 300°C for 1 hour. Glycerin is recovered in the water, and t...

Embodiment 2

[0024] Soybean oil and ethanol were used for ester substitution reaction, and the molar ratio of soybean oil and ethanol was 1:6. The reaction product is separated by static layering, and the supernatant (crude ethyl ester) is cooled to -5°C to filter and remove the filter residue, and then the filtrate is passed into the secondary adsorption column. ITQ-22 molecular sieve, normal pressure makes crude ethyl ester pass through two-stage adsorption column to obtain purified biodiesel. The NU-87 molecular sieve taken out of the primary adsorption column is heated to above 80°C, and the ethanol vapor is recovered and directly enters the ester substitution reaction kettle. Soak the ITQ-22 molecular sieve in the secondary adsorption column in water for 3 hours and then dry it at 300°C for 1 hour to recover glycerin in the water. The ITQ-22 molecular sieve can be loaded into the adsorption column for continued use. The purity of the obtained ethyl ester is 99.4%, the concentration o...

Embodiment 3

[0026] Using lard and methanol for ester substitution reaction, the molar ratio of lard and methanol is 1:7. Pass the product into the secondary adsorption column, the first stage is equipped with ZSM-57 molecular sieve, the secondary adsorption column is equipped with ITQ-27 molecular sieve, pressurize (1.5 standard atmospheric pressure) to make the crude methyl ester pass through the two-stage adsorption column to be purified of biodiesel. The ZSM-57 molecular sieve taken out of the primary adsorption column is heated to above 65°C to recover methanol. Soak the ITQ-27:12MR molecular sieve in the secondary adsorption column in water for 3 hours and then dry it at 300-310°C for 1 hour. Glycerin is recovered in the water, and the ITQ-27:12MR molecular sieve can be reused. The purity of the obtained methyl ester is 98.2%, the methanol concentration is 96.4%, and the glycerin 60% aqueous solution.

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Abstract

The invention belongs to the technical field of a method for preparing high-purity biodiesel, and in particular relates to a method for purifying biodiesel capable of purifying and producing the biodiesel by utilizing an absorbent resin. The biodiesel is purified and produced by utilizing the absorbent resin, so that the vices of the conventional purification method can be overcome, the purity of the biodiesel is increased greatly, and the recovery rate and the purity of methanol and glycerin can be improved.

Description

technical field [0001] The invention belongs to the technical field of high-purity biodiesel preparation methods, and specifically relates to a method for purifying biodiesel, which uses an adsorption resin to purify and produce biodiesel. Background technique [0002] With the reduction of reserves of petroleum resources, the development of biodiesel has a huge social demand and significance. At present, the domestic production of biodiesel (methyl ester, ethyl ester) usually adopts the following two processes: [0003] One is: the intermediate product of the esterification reaction is stratified statically, the supernatant liquid is taken, and then washed with water until dried in a drying tower to obtain a biodiesel product. The obtained biodiesel has the following problems: 1. the water washing process is difficult to thoroughly remove impurities, the recovery rate of methanol is low and the process is complicated, and the content of the product fatty acid methyl este...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11B3/10C10L1/02
CPCY02E50/13Y02E50/10
Inventor 张成如车春玲
Owner 中青能源科技有限公司
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