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Method for improving quality of biodiesel

A biodiesel and high-quality technology, applied in the direction of biofuel, fermentation, etc., can solve the problems of easy emulsion formation, increased difficulty, increased energy consumption, etc., and achieve the effect of simplifying the separation and purification process, good economic benefits and social benefits

Inactive Publication Date: 2016-09-21
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation of biodiesel by chemical method has the following disadvantages: ① The free fatty acid and water in the oil raw material seriously affect the reaction; ② The solubility of methanol in oil is poor, and it is easy to form an emulsion, which increases the difficulty of subsequent treatment; ③ The whole process requires the amount of methanol The reaction molar ratio is greatly exceeded, and the recovery of excess methanol increases energy consumption
However, the conversion of low-quality non-edible oil and fat raw materials into biodiesel by conventional lipase-catalyzed process has the following problems. The total glycerol content in biodiesel products often exceeds the relevant standards in Europe and the United States, and most follow-up procedures need to go through tedious washing, distillation and other processes. , the process energy consumption is high, and the product yield is low. It is urgent to develop new technologies to improve the quality of biodiesel

Method used

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  • Method for improving quality of biodiesel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The liquid lipase derived from Candida antarctica (Candida antarctica) of 10g gutter oil, 10% water based on oil quality and 200 standard enzyme activities (200U / g soybean oil) based on unit oil quality was placed in a suitable enzyme Catalyzed one-stage or multi-stage enzyme reactors. Control the temperature at 35°C, and then add ethanol with a molar ratio of 4.5:1 based on oil at a constant speed within 3 hours. After reacting for 6 hours, the conversion rate of effective oil to biodiesel is 90%, and then the reaction liquid is left to stand for phase separation, and the heavy phase and light phase containing enzyme are separated. In the heavy phase, the enzyme protein is further recovered by membrane separation, and an organic membrane with a molecular weight cut-off of 15,000 Da is selected for the recovery of the above-mentioned lipase. The recovery rate of the enzyme protein is as high as 95%, and the residual amount of the by-product glycerol in the recovered enz...

Embodiment 2

[0022] Put 10g of lard, 4% water based on oil mass and 300 standard enzyme activities based on unit oil mass into the liquid lipase derived from Aspergillus oryzae, which is placed in a primary or multi-stage enzyme suitable for enzymatic catalysis in the reactor. Control the temperature at 40°C, and then add methanol with a molar ratio of 5:1 based on oil at a uniform rate within 4 hours. After reacting for 8 hours, the conversion rate of effective oil to biodiesel was 91%. Then the reaction solution is centrifuged to separate the heavy phase containing enzyme and the light phase containing crude biodiesel. In the heavy phase, the enzyme protein is further recovered by membrane separation, and an organic membrane with a molecular weight cut-off of 15,000 Da is selected for the recovery of the above-mentioned lipase. The recovery rate of the enzyme protein is as high as 95%, and the residual amount of the by-product glycerol in the recovered enzyme liquid is less than 5%. En...

Embodiment 3

[0024] 10g of palmitoleic acid, 5% water based on oil mass and liquid lipase derived from Thermomyces lanuginosus (Thermomyces lanuginosus) based on 200 standard enzyme activities per unit oil mass and 400 standard enzyme activities based on unit oil mass The liquid lipase derived from Aspergillus oryzae is placed in a one-stage or multi-stage enzyme reactor suitable for enzyme catalysis. Control the temperature at 45°C, and then add ethanol with a molar ratio of 6:1 based on oil at a constant speed within 2 hours. After reacting for 5 hours, the conversion rate of effective oil to biodiesel is 92%, and then the reaction solution is centrifuged to separate the heavy phase containing enzyme and the light phase containing crude biodiesel. In the heavy phase, the enzyme protein is further recovered by membrane separation, and an inorganic membrane with a molecular weight cut-off of 15,000 is selected for the recovery of the above-mentioned lipase. The recovery rate of the enzyme ...

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Abstract

The invention provides a method for improving the quality of biodiesel. The method comprises the following steps: 1, reacting oil, short-chain alcohol, water and liquid lipase in a one-stage or multi-stage enzyme reactor, separating a reaction solution into a heavy phase and a light phase, and recycling enzymes in the heavy phase, the light phase being used for subsequent immobilized enzyme transformation; 2, causing the light phase obtained in step 1 to flow into a one-stage or multi-stage reactor with immobilized lipase, adding short-chain alcohol for reaction, and performing online dehydration in a reaction process; 3, causing a reaction solution obtained in step 2 to flow into an enzyme reactor of the next stage to be reacted with dimethyl carbonate or diethyl carbonate, and performing online hydration in a reaction process to further implement complete transformation of the oil to biodiesel, wherein the yield of the biodiesel exceeds 98 percent, and the total glycerin content is lower than 0.2 percent. According to the method, low-quality non-edible oil can be transformed into high-quality biodiesel, a subsequent separation and purification process is greatly simplified, and good economic benefits and social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of biodiesel synthesis, in particular to a method for improving the quality of biodiesel. Background technique [0002] Biodiesel is a long-chain fatty acid ester substance produced by transesterification of bio-oil raw materials. It is a new type of pollution-free renewable energy and has broad application prospects in the oil industry. At present, biodiesel is mainly produced by chemical methods, that is, animal and vegetable oils and some low-carbon alcohols (methanol or ethanol) are used for transesterification under the action of alkali or acidic catalysts to generate corresponding fatty acid methyl or ethyl esters. The chemical method has the following disadvantages in the preparation of biodiesel: ① The free fatty acid and water in the oil raw materials seriously affect the reaction; ② The solubility of methanol in oil is poor, and it is easy to form an emulsion, which increases the difficulty of subs...

Claims

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Application Information

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IPC IPC(8): C12P7/64
CPCC12P7/649Y02E50/10
Inventor 杜伟戴玲妹刘德华关鼎耀
Owner TSINGHUA UNIV
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