A kind of double-acid site immobilized ionic liquid catalyst for synthesizing biodiesel and preparation method thereof

A technology for synthesizing biology and ionic liquids, applied in the direction of organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low catalytic activity and acid content of pure silicon mesoporous materials In order to solve the problems of weak acid strength and small specific surface area, it is beneficial to heat and mass transfer, excellent catalytic activity, and easy to separate and recycle.

Active Publication Date: 2018-09-28
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Pure silicon mesoporous materials such as SBA-15 and MCM-41 have the advantages of regular pore structure, excellent surface physical and chemical properties, and good thermal and hydrothermal stability, etc., and are used as various catalyst supports, but pure silicon mesoporous The acid content and acid strength of the porous material itself are weak, so the catalytic activity is low
super acid SO 4 2- / ZrO 2 It has higher acid strength than liquid acid, but has poor porosity, small specific surface area and active component SO 4 2- Disadvantages such as easy loss, there are certain limitations for the organic reaction of macromolecules

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] mesoporous SO 4 2- / ZrO 2 -SiO 2 Synthesis: Add 1 g of F127 with MW=12600 into 58 mL of HCl solution with a concentration of 2 mol / L, stir and mix evenly at 40°C, add 4.6 mL of TMB into the above solution, continue to stir at constant temperature for 3 h, and add to the above reaction mixture successively Add TEOS, Zr(n-OBu) 4 and (NH 4 ) 2 SO 4 The aqueous solution, the molar ratio of silicon and zirconium is 2:1, the molar ratio of sulfur and zirconium is 1:1, the obtained sol is kept stirring at a constant temperature of 40 ℃ for 2d, and the mixed solution is transferred to a stainless steel hydrothermal reaction kettle, 120 Crystallized at ℃ for 2 days to obtain a white gel, which was vacuum filtered, washed 8 times with water, dried at 100℃ for 24h, and the product obtained was calcined at 600℃ for 5h to obtain the mesoporous material SO 4 2- / ZrO 2 -SiO 2 ;

[0020] Double-acid-site immobilized ionic liquid catalyst SO 4 2- / ZrO 2 -SiO 2 -The prepar...

Embodiment 2

[0023] Under the condition that the preparation conditions of the catalyst are exactly the same as in Example 1, only the mol ratio of silicon and zirconium in the preparation method is changed to 1.5:1 to obtain the double-acid-site immobilized ionic liquid SO 4 2- / ZrO 2 -SiO 2 -IL.

[0024] Add 4g of soybean oil and 4.4g of methanol into a 50mL autoclave, and then add 0.15g of the above SO 4 2- / ZrO 2 -SiO 2 -IL catalyst, reacted at 150°C for 5 hours, the yield of biodiesel obtained was 94.78%, and after repeated use for 5 times, the yield of biodiesel was 83.88%.

Embodiment 3

[0026]Under the situation that the preparation conditions of the catalyst are exactly the same as in Example 1, only the molar ratio of silicon and zirconium in the preparation method is changed to 1:1, and the double-acid-site immobilized ionic liquid SO is obtained. 4 2- / ZrO 2 -SiO 2 -IL.

[0027] Add 4g of soybean oil and 4.4g of methanol into a 50mL autoclave, and then add 0.15g of the above SO 4 2- / ZrO 2 -SiO 2 -IL catalyst, reacted at 150°C for 5 hours, the yield of biodiesel obtained was 97.03%, and after repeated use for 5 times, the yield of biodiesel was 88.20%.

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PUM

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Abstract

The invention discloses a double acid site immobilized type ionic liquid catalyst for synthetic biodiesel and a preparation method thereof. An acid mesoporous material SO42- / ZrO2-SiO2 is taken as a carrier, acidic ironic liquid [Ps-im]HSO4 is chemically bonded and immobilized on the SO42- / ZrO2-SiO2 carrier, an ionic liquid immobilized type catalyst SO42- / ZrO2-SiO2-IL with double acid sites is obtained, and the double acid sites are a acid site provided by ionic liquid and a Lewis acid site provided by the carrier. The double acid site immobilized type ionic liquid catalyst for the synthetic biodiesel has the advantages that the prepared SO42- / ZrO2-SiO2-IL catalyst is used for synthesis of the biodiesel through soybean oil and methanol ester exchange, the catalyst has the advantages of high activity, easiness in recycling, good heat stability and small corrosion and the like during reaction, and the catalyst is expected to be a clean process route having high competitiveness.

Description

technical field [0001] The invention relates to a double-acid-site immobilized ionic liquid catalyst for synthesizing biodiesel and a preparation method thereof, and belongs to the technical field of catalytic synthesis of biodiesel. Background technique [0002] Rising oil prices and increased demand for petroleum products have prompted the search for other renewable sources of energy, and biodiesel from triglycerides, a renewable liquid fuel, is expected to compensate for the increased demand for petroleum fuels. The main component of biodiesel is the carbon chain length in C 12 -C 22 Fatty acid monoesters have similar physical and chemical properties to petrochemical diesel, and have the advantages of renewable, zero sulfur emissions, biodegradable, and non-toxic. [0003] Biodiesel is generally produced from animal and vegetable oils (such as soybean oil, sunflower oil, palm oil, etc.) and short-chain alcohols (such as methanol, ethanol) through acid or base-catalyzed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/02C10L1/02C11C3/10
CPCB01J31/0295C10L1/02C10L2200/0476C11C3/10Y02E50/10
Inventor 范明明刘慧张萍波
Owner JIANGNAN UNIV
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