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Method for preparing biodiesel by solid acid-base catalyst

A technology of solid base catalyst and biodiesel, which is applied to the preparation of biofuels, biological raw materials, liquid hydrocarbon mixtures, etc., can solve the problems of complicated post-processing, environmental pollution, etc., and achieve simplified post-processing, easy separation and purification, and raw materials Effects from a wide range of sources

Inactive Publication Date: 2005-02-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a method for preparing biodiesel using solid acid and alkali catalysis, which solves the problems of complex post-treatment and environmental pollution caused by the traditional use of liquid acid or liquid alkali as catalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0015] Raw materials: soybean oil, methanol, zirconium sulfate.

[0016] 80ml soybean oil (density 0.92g / cm 3 ) and 20ml methanol (density 0.792g / cm 3 ) into a 250ml three-necked round-bottomed flask, stirred, added 2.2 grams of 100-mesh zirconium sulfate, heated to 65°C, and stopped stirring and heating after 6 hours of reaction. First move the reaction solution to the centrifuge cylinder to separate the zirconium sulfate, then pour it into the separatory funnel, let it stand still, and divide it into upper and lower layers.

[0017] After methanol was removed by distillation in the upper layer water bath, 81.05 grams of biodiesel was obtained, and the yield could reach 99%. After steaming the remaining methanol in the lower layer, 7.50 grams of glycerol was obtained, and the theoretical glycerol yield was 7.57 grams. It is 99%, consistent with the above conclusion.

[0018] performance

[0019] It can be seen from the above table that the main performance indica...

specific Embodiment approach 2

[0020] Raw materials: waste cooking oil, methanol, SO 4 2- / ZrO 2 .

[0021] Purify the waste oil first: heat to 50°C, add 1% aluminum sulfate dropwise, stir for 30 minutes and then centrifuge to remove colloids and impurities. Take 72.80 grams of purified waste oil and 21.38 grams of methanol into a 250ml three-neck round bottom flask, stir, add 2.9 grams of 80-100 mesh SO 4 2- / ZrO 2 , heated to 75 ° C, after 8 hours of reaction, stop stirring and heating. First transfer the reaction solution to the centrifuge cylinder to dissolve the SO 4 2- / ZrO 2 Separate it, then pour it into a separatory funnel, let it stand, and divide it into upper and lower layers. The upper layer was distilled in a water bath to remove methanol, and decolorized at 105° C. for 40 minutes to obtain 72.90 g of biodiesel with a yield of 90%.

[0022] The obtained biodiesel product was analyzed by high-performance liquid chromatography (chromatographic column VD-ODS (150L×4.6), 25°C, 0.8ml / min,...

specific Embodiment approach 3

[0023] Raw materials: soybean oil, methanol, zinc oxide

[0024] 80ml soybean oil (density 0.92g / cm 3 ) and 20ml methanol (density 0.792g / cm 3 ) into a 250ml three-necked round-bottomed flask, stirred, added 2.2 grams of 80-100 mesh zinc oxide, heated to 65°C, and reacted for 6 hours, then stopped stirring and heating. First move the reaction solution to the centrifugal cylinder to separate the zinc oxide, then pour it into the separatory funnel, let it stand still, and divide it into upper and lower layers.

[0025] After the methanol was distilled off in the upper layer water bath, 80.23 grams of biodiesel was obtained, and the yield could reach 98%. After the remaining methanol was distilled off in the lower layer, 7.42 grams of glycerol was obtained, and the theoretical glycerol yield was 7.57 grams. It is 98%, consistent with the above conclusion.

[0026] The obtained biodiesel product was analyzed by high-performance liquid chromatography (chromatographic column VD-O...

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Abstract

The invention relates a kind of preparation method of bio-diesel oil under the condition of solid ac and alk catalyzing. The character is that under the condition of solid ac and alk catalyzing, gain the bio-diesel oil using the craft of exchange reaction of soja oil with carbinol. Afer the reaction, apart catalyser from reaction liquor by centrifugal machine till delimination in quiet placing, the above is rough output, the below is admixture of glycerol and carbinol. Distil the of above to gain bio-diesel oil and to gain the pure glycerin in the same way. The distilled carbinol can be used again and again. The invention has many advantages, for example, its raw material can be rebirth, its craft is easy and only need normal equipment. Even treat the used oil, the whole process is easier compared with the method in solid ac and alk catalyzing, besides, the process will not produce foul water so it is environmental. Every plant of the bio-diesel accords with standards compared with foreign similar competitive grade and the main plants are close to its of 0# (GB252-1994, superior product)diesel of China.

Description

(1) Technical field [0001] The invention relates to the technical field of green and renewable energy, in particular to a method for preparing biodiesel by solid acid and alkali catalysis. (2) Background technology [0002] Diesel, as an important petroleum refining product, occupies a relatively high share in the fuel structure of various countries and has become an important power fuel. With the acceleration of dieselization of vehicles worldwide, the demand for diesel will increase in the future. With the depletion of petroleum resources and the improvement of people's awareness of environmental protection, people begin to pay attention to the substitutes of petroleum fuels. Biodiesel is a renewable energy produced from vegetable or animal fats and can be used as a high-quality substitute for petroleum diesel. my country is a big agricultural country, and agricultural resources are in urgent need of development. Using vegetable oil to produce biodiesel is the largest sa...

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 曹维良曹宏远柳春霞张敬畅
Owner BEIJING UNIV OF CHEM TECH
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