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Method for producing biodiesel with no by-product of glycerin, under catalysis of immobilized enzyme

A technology for immobilizing enzymes and biodiesel, applied in renewable new energy and green fields, can solve the problems of waste of resources, pollute the environment, aggravate environmental pollution, etc., achieve the effects of easy separation, improve utilization rate, and solve technical and economic burdens

Inactive Publication Date: 2011-09-28
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] This process is not only difficult to separate the catalyst, but also the catalyst needs to be washed and deactivated after the reaction, and a large amount of waste acid and lye are discharged, polluting the environment; in addition, with the increase of biodiesel production, a large amount of by-product crude glycerin is generated, due to Crude glycerin contains certain impurities such as saponified substances, catalyst residues, and methanol, and can only be used after complex separation and purification. Therefore, crude glycerin, a by-product produced by traditional methods of biodiesel production, is cheap and mostly discarded as garbage, which not only causes Waste of resources and further aggravate environmental pollution

Method used

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  • Method for producing biodiesel with no by-product of glycerin, under catalysis of immobilized enzyme
  • Method for producing biodiesel with no by-product of glycerin, under catalysis of immobilized enzyme
  • Method for producing biodiesel with no by-product of glycerin, under catalysis of immobilized enzyme

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 5g of palm oil into a stoppered Erlenmeyer flask containing 8.5g of dimethyl carbonate, heat it to 60°C in a constant-temperature water-bath shaker, then add 1g of immobilized lipase Novozyme435 into the Erlenmeyer flask, and react at constant temperature for 24 hours. The catalyst was separated and recovered by filtration, and the filtrate was removed by rotary evaporation to remove excess dimethyl carbonate, and no glycerol stratification appeared after standing. The product was quantitatively analyzed by gas chromatography, and no free glycerin was detected. The yield of biodiesel reached 92.5%. .

Embodiment 2

[0030] Add 5 g of palm oil into a stoppered Erlenmeyer flask filled with 8.5 g of dimethyl carbonate, heat it to 60° C. in a constant temperature water bath shaker, then add 1 g of immobilized lipase Novozyme 435 recovered from Example 1 into the Erlenmeyer flask In the process, after constant temperature reaction for 24 hours, the catalyst was separated by suction filtration, and the filtrate was removed by rotary evaporation to remove excess dimethyl carbonate, and there was no glycerin stratification on standing. The product was quantitatively analyzed by gas chromatography, and no free glycerin was detected. The yield yield reached 93.0%.

[0031] According to the methods of Examples 1 and 2, the immobilized enzyme catalyst was used more than 20 times, and the yield of biodiesel remained at about 90%.

Embodiment 3

[0033] Add 5 g of palm oil into a stoppered Erlenmeyer flask filled with 13.93 g of diethyl carbonate, heat it to 40°C in a constant temperature water bath shaker, add 1 g of immobilized lipase Lipozyme TL IM, and react at constant temperature for 18 hours. The catalyst was separated and recovered by filtration, and excess diethyl carbonate was removed by rotary evaporation in the filtrate, and no glycerol stratification appeared on standing. The product was quantitatively analyzed by gas chromatography, no glycerin was detected, and the yield of biodiesel was 93.2%.

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Abstract

The invention relates to a method for producing biodiesel with no by-product of glycerin under the catalysis of an immobilized enzyme. The method comprises steps that: an ester exchange reagent is mixed with animal / vegetable oil; the mixture is subject to a reaction in a shaking bath under the existence of the immobilized enzyme catalyst, with a reaction temperature of 20 to 100 DEG C and a reaction time of 15 to 48 hours, wherein a molar ratio of the ester exchange reagent to the animal / vegetable oil is 2:1 to 30:1, and the mass of the added catalyst equals 1 to 30% of the mass of the animal / vegetable oil; the catalyst is removed by filtering, and excess ester exchange reagent is removed by distillation, such that biodiesel is obtained. The method of the invention has advantages that: methanol is replaced by the new ester exchange reagent, such that the problem of enzyme catalyst deactivation caused by methanol in prior arts is avoided; the catalyst is easy to separate without washing, such that no waste water is generated, and the catalyst can be reused; no glycerin is generated, because oil is subject to an ester exchange reaction with the ester exchange reagent to co-produce glycerin downstream products which serve as one of the components of the biodiesel; no separation is necessary, and the utilance of the raw materials is improved.

Description

【Technical field】 [0001] The invention relates to the technical field of green and renewable new energy, and belongs to a new process for preparing biodiesel. Specifically, it is a new type of transesterification reagent under the catalysis of immobilized lipase and animal and vegetable oils without by-products. A new approach to glycerol biodiesel. 【Background technique】 [0002] Biodiesel is a series of mono-alkyl esters of long-chain fatty acids, which has similar combustion properties to petrochemical diesel, and is an environmentally friendly fuel that can replace petrochemical diesel. With the increasing depletion of petroleum resources and the improvement of people's awareness of environmental protection, biodiesel, as a clean energy source, has attracted widespread attention. Biodiesel raw materials mainly come from renewable resources such as animal and vegetable oils, which are not limited by reserves, and the raw materials are non-toxic, and there are few harmful...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/10C10L1/02
CPCY02E50/13
Inventor 辛忠张丽平刘群
Owner EAST CHINA UNIV OF SCI & TECH