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Method for synthesizing biodiesel with high cetane number and catalyst thereof

A dual-function catalyst, diesel technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, biofuels, etc., can solve the increased cost of biodiesel, long reaction time and process operations, etc. question

Inactive Publication Date: 2012-12-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the international patent WO 2006111997 A1 discloses a two-step process of biodiesel that meets the standard through the synthesis of fatty acid methyl esters and partial hydrogenation of fatty acid methyl esters for highly unsaturated oils and fats. The two-step process uses two sets of devices, two separate The reaction of two catalysts requires a long reaction time and process operation, which undoubtedly increases the cost of biodiesel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 21.163 g of strontium nitrate was dissolved in 200 mL of deionized water to obtain a strontium nitrate solution, and then 19.13 g of ammonium carbonate was dissolved in 500 mL of deionized water to obtain an ammonium carbonate solution. Drop the ammonium carbonate solution into the strontium nitrate solution drop by drop, and then stir for 3 h to react, then filter to obtain the precursor precipitate, then wash, dry at 120 °C for 12 hours, and vacuum calcinate at 1000 °C for 5 h produced strontium oxide. Dissolve 3.147 g of copper nitrate in deionized water, then add ammonia water until the pH value of the solution is 9, then add strontium oxide into the cuproammonia solution, stir for 20 minutes, then slowly dilute the solution to uniformly precipitate copper and disperse it on the strontium oxide carrier Then, it was filtered, washed, dried at 120 °C for 12 hours, and vacuum-calcined at 1000 °C for 5 h to obtain a strontium oxide-supported copper oxide catalyst.

[0...

Embodiment 2

[0053] 21.163 g of strontium nitrate was dissolved in 200 mL of deionized water to obtain a strontium nitrate solution, and then 9.04 g of oxalic acid was dissolved in 500 mL of deionized water to obtain an oxalic acid solution. Drop the oxalic acid solution into the strontium nitrate solution drop by drop, and then stir the reaction for 3 h, then filter to obtain the precursor precipitate, then wash, dry at 120 °C for 12 hours, and vacuum calcinate at 1000 °C for 5 h Strontium oxide is produced. Dissolve 3.147 g of copper nitrate in deionized water, then add ammonia water until the pH value of the solution is 9, then add strontium oxide into the cuproammonia solution, stir for 20 minutes, then slowly dilute the solution to uniformly precipitate copper and disperse it on the strontium oxide carrier Then filter, wash, dry at 120 °C for 12 hours at a constant temperature, and vacuum calcinate at 1000 °C for 5 h to obtain a strontium oxide-supported copper oxide catalyst.

[005...

Embodiment 3

[0056] Strontium oxide was obtained by calcining 12.164 g of strontium hydroxide octahydrate under vacuum at 1000°C for 5 h. Dissolve 3.147 g of copper nitrate in deionized water, then add ammonia water until the pH value of the solution is 9, then add strontium oxide into the cuproammonia solution, stir for 20 minutes, then slowly dilute the solution to uniformly precipitate copper and disperse it on the strontium oxide carrier Then, it was filtered, washed, dried at 120 °C for 12 hours, and vacuum-calcined at 1000 °C for 5 h to obtain a strontium oxide-supported copper oxide catalyst.

[0057]Select refined hemp seed oil and methanol as raw materials, respectively press methanol: hemp seed oil=12.0:1.0 molar ratio and catalyst: hemp seed oil=3.0:100.0 mass ratio, weigh 90.54 g refined hemp seed oil, add with In the high-pressure reactor of stirrer, thermocouple and condensing pipe, the catalyst 2.72 g that makes in the present embodiment is mixed with 39.83 g anhydrous metha...

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Abstract

The invention relates to a method for synthesizing biodiesel with high cetane number by catalyzing one step ester exchange of highly unsaturated fat and hydrogenation reaction, and catalyst thereof. Bifunctional catalyst alkaline earth metallic oxide loading copper oxide is prepared by chemisorption hydrolysis together with vacuum calcination with alkaline earth metallic oxide prepared by vacuum calcination as the carrier. The method includes the following steps: adding unsaturated fat, lower alcohol and catalyst to a high pressure reactor and mixing up based on the alcohol-fat molar ratio of 6-36:1 and fat-catalyst weight ratio of 1:0.01-1:0.1; filling nitrogen and hydrogen in turn to change the gas in the high pressure reactor, then sealing the reactor for heating and mixing; as the temperature rises to 150-220 DEG C, filing 1-10MPa hydrogen; after 2-20h of reaction, removing the solid catalyst of the reaction product by filtration, separating the glycerol layer, evaporating alcohol and finally getting biodiesel which contains single unsaturated oleic acid ester transformed from polyunsaturated low carbon ester with high cetane number over 51 and other properties that meet German Standard, such as low temperature liquidity and antioxidation stability.

Description

technical field [0001] The invention relates to a synthesis method and catalyst for synthesizing high cetane number biodiesel from highly unsaturated animal and vegetable oils, and specifically discloses a preparation method of a bifunctional catalyst that catalyzes a one-step transesterification reaction and a selective hydrogenation reaction. It catalyzes a synthetic method for synthesizing high cetane number biodiesel through one-step transesterification reaction and selective hydrogenation reaction of highly unsaturated animal and vegetable oils. Background technique [0002] Biodiesel is a clean and safe new fuel that uses renewable biomass such as animal and vegetable oils to replace petrochemical diesel. Its main components are fatty acids formed from long-chain saturated and unsaturated fatty acids with 14 to 22 carbons and low-carbon alcohols Esters, mainly fatty acid methyl esters. With the increasing shortage of petrochemical resources and the gradual enhancement...

Claims

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Application Information

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IPC IPC(8): C11C3/10C11C3/12C10L1/02B01J23/78
CPCY02E50/13Y02E50/10
Inventor 杨儒苏孟兴李敏
Owner BEIJING UNIV OF CHEM TECH
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