Production of biological diesel oil with solid alkali

A technology of biodiesel and solid base catalyst, which is applied in the fields of biofuels, biomaterials, petroleum industry, etc., can solve the problems of high catalytic activity, slow reaction rate, long reaction time, etc., and achieves simple and easy-to-control process and mild reaction conditions. , the effect of good economic benefits

Inactive Publication Date: 2007-01-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Concentrated sulfuric acid is cheap and rich in resources. The main problems are: the reaction rate is too slow, the reaction time is long, the temperature is high, and it is accompanied by side reactions such as sulfonation and sulfation; the corrosion of equipment is relatively serious, and a large amount of methanol is used. The recovery of glycerin is difficult, so the catalyst has been phased out
Its biggest advantage is that it has high catalytic activity, the reaction speed can be accelerated at low temperature, and no decompression reaction is required. The catalyst is easily soluble in fatty acid esters, but it also has the disadvantage of homogeneous catalytic reaction.
[0006] Using homogeneous catalysis, it is difficult to obtain high-quality methyl esters with high yields, and often needs to be neutralized to remove the catalyst, and the by-product glycerin is not easy to separate and purify
The biggest disadvantage of homogeneous reaction is the complexity of post-treatment, resulting in increased cost, decreased utilization of raw materials, and the generation of three wastes, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Under stirring, 7.86 g of calcium nitrate tetrahydrate was dissolved in 400 ml of ethanol, and stirring was continued for 30 minutes. 200 ml of deionized solution dissolved with 3.51 g of sodium carbonate was slowly added dropwise to the above solution, the precipitate was centrifuged, washed 4 times with deionized water, and then dried in an oven at 110° C. for 24 hours. The obtained sample was calcined at 1200° C. for 0.5 hour to obtain solid particle type solid base SX1.

[0027] 19.2 grams of methanol and 85 grams of jatropha oil were added to a 500-ml round-bottomed flask with 1.7 grams of SX1 placed in advance, a condenser tube and a drying tube were installed, the temperature was raised to 90° C. for 2.5 hours under stirring, and the reaction was stopped. When the temperature drops to 60°C, methanol is recovered by distillation under reduced pressure at a vacuum of -0.1 MPa under slow stirring until the vacuum no longer changes. Centrifuge to remove solid partic...

Embodiment 2

[0030] Under stirring, 7.86 g of calcium nitrate tetrahydrate was dissolved in 15.72 ml of deionized water and stirring was continued for 60 minutes. 200 ml of deionized solution dissolved with 10.55 g of sodium carbonate was slowly added dropwise to the above solution, centrifuged to separate the precipitate, washed 4 times with deionized water, and then placed in an oven at 110° C. for 24 hours to dry. The obtained sample was calcined at 700° C. for 10 hours to obtain solid particle type solid base SX2.

[0031] Add 3.2 grams of methanol, 0.72 grams of ethanol and 8.5 grams of castor oil into a 500 ml round-bottomed flask with 0.034 grams of SX2 placed in advance, install a condenser tube and a drying tube, heat up to 40 ° C for 0.8 hours under stirring, and stop the reaction . While keeping the temperature at 40°C, under slow stirring, the methanol was distilled under reduced pressure at a vacuum of -0.08MPa to recover methanol until there was no change in the vacuum. Cen...

Embodiment 3

[0033] Add 4 g of barium nitrate and 4.3 g of magnesium chloride hexahydrate into 600 ml of ethanol, and ultrasonically disperse for 30 minutes. Under stirring, heat the above solution to 60°C, add 200ml of isopropanol, 0.8g of succinic acid, add 2.75g of XC-72 activated carbon, stir and ultrasonic for 4 hours, slowly add 0.5g of polyethylene glycol dropwise 400 aqueous solution 200 ml, continue to stir for 4 hours. Slowly evaporate the solvent at 90°C, raise the temperature from 30°C to 850°C at a rate of 1°C / min, and calcinate at 850°C for 4 hours, porous solid base DK1.

[0034]Add 1.12 grams of methanol and 8.5 grams of cottonseed oil into a 500-ml round-bottomed flask with 0.77 grams of DK1 in advance, install a condenser tube and a drying tube, heat up to 75°C for 20 hours under stirring, and stop the reaction. When the temperature dropped to 30°C, methanol was distilled under reduced pressure at a vacuum of -0.1 MPa under slow stirring until the vacuum no longer change...

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Abstract

Production of biological diesel oil by solid base is carried out by taking solid base as catalyst, and lipid exchange reacting for short-chain aliphatic alcohol and vegetable oil at suitable temperature and removing impurities of crude biological diesel oil to obtain the final product. The catalyst is re-useable and combined precipitant with flocculant It is simple and efficient, has gentle reactive condition and no environmental pollution.

Description

technical field [0001] The invention relates to a process for preparing biodiesel with solid base, in particular to a heterogeneous catalytic process used in the lipid exchange reaction for preparing biodiesel. Background technique [0002] At present, biodiesel is mainly produced by chemical reaction method through lipid exchange reaction, that is, animal and vegetable oils and methanol or ethanol are used for transesterification under acidic or alkaline catalysts and a certain temperature to generate corresponding fatty acid methyl ester or ethyl ester , and then washed and dried to obtain biodiesel; at the same time, the by-product glycerin is obtained, and the technology for producing biodiesel by chemical method is becoming more and more mature. [0003] Acid-catalyzed transesterification processes are generally catalyzed using Bronsted acids. The more commonly used catalysts are concentrated sulfuric acid, benzenesulfonic acid and phosphoric acid. Concentrated sulfur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 吴宗斌毛宗强朱华平陈元雄段士杰
Owner TSINGHUA UNIV
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