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Method and system for enzymatic preparation of biodiesel

A technology for biodiesel and enzymatic preparation, which is applied in the fields of biofuel, petroleum industry, fatty acid esterification, etc., can solve the problems of increasing the amount of anhydrous short-chain alcohol, slowing down the production rate, and being unsatisfactory, and reducing the use of volume, the effect of reducing time

Pending Publication Date: 2016-04-20
BEIJING CENWAY BIO ENERGY TECH
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Problems solved by technology

Because this kind of oil contains free fatty acids, the water generated during the esterification process of biodiesel will hinder the further progress of the esterification reaction: according to the different amount of methanol, the acid value of the final biodiesel crude ester is generally 1.2 ~ 10mgKOH / g oil, the acid value after distillation is generally above 1mgKOH / g oil, which does not meet the requirements of the Chinese National Biodiesel Standard GB / T20828-2007 "Biodiesel for Diesel Fuel Blending (BD100)", the acid value ≤ 0.8mgKOH / g oil , even less than 0.5mgKOH / g oil that does not meet the requirements of Europe and the United States
[0007] In order to ensure that the acid value of biodiesel is as close as possible to or meet the national standard, the water produced by the reaction needs to be separated many times during the biodiesel reaction process, and the amount of anhydrous short-chain alcohol should be increased, and the short-chain alcohol recovered from the reaction needs to be Purification on the short-chain alcohol rectification column, resulting in higher costs in this part
There is also a method of using molecular sieve dehydration to make the water content in the reaction system lower than 500ppm, so that the acid value is ≤0.5mgKOH / g oil, but the energy consumption of molecular sieve regeneration is high, and the loss of short-chain alcohol is large, so it is not suitable for industrial applications.
Tsinghua University discloses an on-line dehydration method using low-temperature short-chain alcohols to promote biodiesel yield (CN103131735A), but the temperature of short-chain alcohols is too low, and the short-chain alcohols in the reaction system will also be dehydrated when the water in the reaction system is removed. The excess is taken out of the system; and as the reaction progresses, the concentration of short-chain alcohols decreases, causing the esterification reaction to slow down, and anhydrous short-chain alcohols need to be replaced; since this method is carried out at the laboratory level, when applied to the industrial level During production, a large amount of low-temperature anhydrous short-chain alcohol will be consumed for dehydration to ensure continuous production, the cost will be greatly increased, and the energy consumption will be significant; and the replacement of low-temperature anhydrous short-chain alcohol will also increase the workload, and the replacement process will also slow down the production rate

Method used

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  • Method and system for enzymatic preparation of biodiesel
  • Method and system for enzymatic preparation of biodiesel
  • Method and system for enzymatic preparation of biodiesel

Examples

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Effect test

Embodiment 1

[0049] Acid value 60~100mgKOH / g waste oil and phosphate aqueous solution (concentration is 0.075M, the mol ratio of sodium dihydrogen phosphate and disodium hydrogen phosphate is 1: 1) Place in the reactor, add liquid lipase derived from Aspergillus oryzae (Aspergillus oryzae) based on the amount of waste oil 1.5wt% to catalyze, carry out transesterification and esterification, the reaction temperature is 40 ° C, and continue to flow for 4 hours before the reaction Add 11wt% methanol based on the fat weight, react for 8 hours and then centrifuge to obtain the upper biodiesel crude ester (acid value 8.1mgKOH / g oil, water content 0.3wt%, methanol content 0.98wt%).

[0050] Take 10,000kg of the above biodiesel crude ester and place it in an airlift reactor for esterification reaction. The esterification reaction temperature is 40°C; the condensing temperature of the circulating gas condenser is 8°C, and the circulating gas volume is 20m 3 / min; the amount of water-absorbed methan...

Embodiment 2

[0053] Get 10000kg of crude biodiesel ester (acid value 8.1mgKOH / g oil, water content 0.3wt%, methanol content 0.98wt%) that is preliminarily prepared as in Example 1 and place it in an air-lift reactor, and the esterification reaction temperature is 35 ℃; the condensation temperature of the circulating gas condenser is 5 ℃, and the circulating gas volume is 20m 3 / min; the amount of water-absorbed methanol in the alcohol balance tank is 1786L (water content 0.5wt%), and the temperature is controlled at 15°C. The amount of immobilized lipase derived from Aspergillus oryzae was 1.5% based on the weight of crude ester. After reacting for 4 hours, 100 L of methanol (water content 0.5 wt%) was added to the reactor. After reacting for 6 hours, the acid value of the crude biodiesel ester decreased to 0.49mgKOH / g oil, the water content decreased to 220ppm, and the methanol content was 1.2wt%. The amount of hydrous methanol condensed by the circulating gas is 140L (methanol content ...

Embodiment 3

[0056] Get 10000kg of crude biodiesel ester (acid value 8.1mgKOH / g oil, water content 0.3wt%, methanol content 0.98wt%) that is preliminarily prepared as in Example 1 and place it in an air-lift reactor, and the esterification reaction temperature is 40 ℃; the condensing temperature of the circulating gas condenser is 5 ℃, and the circulating gas volume is 20m 3 / min; the amount of methanol absorbed in the alcohol balance tank is 1506L (water content 3.0wt%), and the temperature of the balance tank is controlled at 20°C. The amount of immobilized lipase derived from Aspergillus oryzae was 1.5% based on the weight of crude ester. After reacting for 4h, add methanol (water content 0.5wt%) 100L in the reactor; After reacting for 5h, the acid value of biodiesel crude ester is reduced to 0.44mgKOH / g oil, and water content is reduced to 254ppm, and methanol content is 1.1wt %. The amount of water-containing methanol condensed by the circulating gas condenser is 380L (methanol cont...

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Abstract

The invention belongs to the field of biochemical engineering, and relates to a method and system for enzymatic preparation of biodiesel. In the biodiesel preparation process, the method comprises the steps that a circulating fan is utilized for exhausting gas from the top of a reactor, gas carrying water and short chain alcohol is cooled through a circulating gas condenser and a majority of water is removed; gas cooled through the circulating gas condenser enters an alcohol balancing pot with the water absorption short chain alcohol to be dehydrated and then enters a reactor from the bottom of the reactor, anhydrous short chain alcohol is added into the reactor as needed, and the concentration of the short chain alcohol in the reactor is kept to be 0.5-2 wt%. According to the method and system, water in a reaction system can be rapidly and effectively removed, the acid value of the biodiesel is greatly decreased, the diesel quality is improved, and the method and system are suitable for large-scale industrial production and application.

Description

technical field [0001] The invention belongs to the field of biochemical industry, and relates to a method and system for preparing biodiesel by enzymatic method. Background technique [0002] Biodiesel is a new type of non-polluting renewable energy. It is superior to petrochemical diesel in terms of flash point, combustion efficiency, sulfur content, oxygen content, aromatic content, and combustion oxygen consumption, while other indicators are similar to those of petrochemical diesel. quite. Suspended particles, CO, sulfide and hydrocarbons in the combustion exhaust gas are greatly reduced, which is environmentally friendly. The research and application of biodiesel has received extensive attention. [0003] At present, biodiesel is mainly produced by chemical method or biological enzymatic method, and is a long-chain fatty acid alcohol (ester) substance produced by transesterification or esterification reaction of oil raw materials. Transesterification is a transester...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/04C10L1/02
CPCC10L1/02C11C3/04C10L2290/141Y02E50/10
Inventor 李开龙朱罗乐
Owner BEIJING CENWAY BIO ENERGY TECH
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