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Method for preparing biodiesel from enzymatic oil

A biodiesel and oil technology, applied in biofuels, fermentation and other directions, can solve the problems of increasing difficulty, poor methanol solubility, and complicated operation process, and achieve good economic and social benefits, good operation stability, and reduced use costs. Effect

Inactive Publication Date: 2018-06-01
TSINGHUA INNOVATION CENT IN DONGGUAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The chemical method has the following disadvantages in the preparation of biodiesel: ① The free fatty acid and water in the oil raw material seriously affect the progress of 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, there are the following problems in the preparation of biodiesel by using conventional lipase catalytic process to convert oil raw materials. The by-product glycerol generated in the reaction process has a serious negative impact on the activity and stability of immobilized lipase, and it is necessary to introduce solvents or other methods for timing Removes glycerol attached to the surface of enzyme molecules
The operation process is cumbersome. If a solvent is introduced, the solvent needs to be separated and recovered, and the process consumes a lot of energy.

Method used

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  • Method for preparing biodiesel from enzymatic oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 10g of soybean oil, methanol (methanol:fat) based on a molar ratio of oil of 0.5 and dimethyl carbonate (dimethyl carbonate:fat) based on a molar ratio of fat of 3, based on 200 standard enzyme activities per unit of fat (200U / g soybean oil) derived from the lipase of Candida antarctica (Candida antarctica), placed in a single or multistage enzyme reactor suitable for enzymatic catalysis. The temperature is controlled at 35°C. During this reaction, the figure 1 In-line dehydration shown (membrane dehydration units including organic, inorganic or ceramic membranes and water absorption units including 3Å or 4Å molecular sieves). After 6 hours of reaction, the conversion rate of effective oil to biodiesel in the system was 98%, the acid value was 0.4mg KOH / g oil, and the total glycerol content was 0.18%.

Embodiment 2

[0023] With 10g lard, based on the methanol (methanol:fat) of 0.8 molar ratio of fat and dimethyl carbonate (dimethyl carbonate: fat) of 4 molar ratio of fat, based on the source of 200 standard enzyme activities per unit fat mass The lipase of Aspergillus oryzae is placed in a one-stage or multi-stage enzyme reactor suitable for enzyme catalysis. The temperature was controlled at 40° C., and in-line dehydration (including the water absorption device of the organic membrane) was carried out during the reaction. Reaction for 2 hours, reaction 8 sales, the conversion rate of effective oil to biodiesel in the system is 98.5%, the acid value is 0.3mg KOH / g oil, and the total glycerin is 0.17%.

Embodiment 3

[0025] 10g of palm oil, based on methanol (methanol: oil) with a molar ratio of oil of 0.6 and dimethyl carbonate (dimethyl carbonate: oil) based on a molar ratio of oil of 5, based on a source of 200 standard enzyme activities per unit oil mass The lipase from Thermomyces lanuginosus and the lipase from Aspergillus oryzae with 200 standard enzyme activities based on the unit oil mass are placed in a one-stage or multi-stage enzyme reactor suitable for enzyme catalysis middle. Temperature control 45 ℃, in this reaction process, carry out as follows figure 1 In-line dehydration shown (water absorption device including inorganic membrane). After 9 hours of reaction, the conversion rate of effective oil to biodiesel in the system was 98%, the acid value was 0.4mg KOH / g oil, and the total glycerol was 0.2%.

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Abstract

The invention provides a method for preparing biodiesel from enzymatic oil. The process comprises the following step: oil, short-chain alcohol, dimethyl carbonate (or diethyl carbonate) and lipase areadded to a single-stage or multi-stage enzyme reactor for a reaction, and online dehydration is performed in the reaction process. Pretreatment of oil raw materials is not needed, byproduct glyceringenerated in transesterification of short-chain alcohol and oil is subjected to further reaction with dimethyl carbonate or diethyl carbonate on line, the online dehydration technique is introduced inthe reaction process, yield of the biodiesel exceeds 98%, acid value of the product is lower than 0.5 mg KOH / g, total glycerin content is lower than 0.2%, and the process has quite good industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of biodiesel synthesis, in particular to a process for preparing biodiesel from enzymatic oil. Background technique [0002] Biodiesel is a new type of non-polluting renewable energy, and its research and application have received extensive attention. 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 material seriously affect the progress of 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 Mu...

Claims

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Application Information

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IPC IPC(8): C12P7/64
CPCC12P7/649Y02E50/10
Inventor 杜伟刘德华刘剑波田兴国邬新国徐递
Owner TSINGHUA INNOVATION CENT IN DONGGUAN
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