A kind of short mesoporous dcnh-zr-sba-15 molecular sieve catalytic synthesis method of biodiesel

A molecular sieve and compound technology, applied in chemical instruments and methods, biofuels, chemical/physical processes, etc., can solve the problems of low reusability, low catalyst surface, easy loss of active components, etc., and achieve good resistance to loss. , mild reaction conditions, easy separation, recovery and reuse

Active Publication Date: 2019-12-10
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN101130700A reports that biodiesel is synthesized by solid base catalysis composed of composite metal oxides of alkaline earth metals and alkali metal oxides, with a yield of more than 90%, but the surface of the catalyst itself is low, the active components are easy to lose, and the reusability is not high

Method used

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  • A kind of short mesoporous dcnh-zr-sba-15 molecular sieve catalytic synthesis method of biodiesel
  • A kind of short mesoporous dcnh-zr-sba-15 molecular sieve catalytic synthesis method of biodiesel
  • A kind of short mesoporous dcnh-zr-sba-15 molecular sieve catalytic synthesis method of biodiesel

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Experimental program
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Effect test

Embodiment 1

[0033] 1. Preparation of short mesoporous 2DCNH-Zr-SBA-15 molecular sieve

[0034] Dicyclohexylcarbodiimide (DCC) and silane coupling agent 3-aminopropyltriethoxysilane (APTES) were refluxed in an aprotic solvent toluene at 120 °C for 40 h to realize the nucleophilic addition reaction of imine, and then After distilling off the organic solvent under reduced pressure, the strongly basic organic guanidine compound DCNH is obtained, wherein the mass ratio of dicyclohexylcarbodiimide, silane coupling agent and organic solvent is 1:1.05:25.

[0035] At 40°C, the surfactant polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123) and ZrOCl 2 ·8H 2 O add 1.6mol / L HCl solution and stir until P123 is completely dissolved to form a mixed solution, then add tetraethyl orthosilicate (TEOS) to the above mixed solution, wherein ZrOCl 2 ·8H 2 O, TEOS, HCl, H 2 O was added to the above mixed solution at a mass ratio of 0.16:2.125:5.9:31.5:1 to P123, and after co...

Embodiment 2

[0039] Example 2 The operation steps are the same as in Example 1, but the mass ratio of the strongly basic organic guanidine compound DCNH to Zr-SBA-15 is changed to 1:1 to obtain a short mesoporous 1DCNH-Zr-SBA-15 molecular sieve for use in Catalytic synthesis of biodiesel, the product yield is 78.5%.

Embodiment 3

[0040] Example 3 The operation steps are the same as in Example 1, but the mass ratio of the strongly basic organic guanidine compound DCNH to Zr-SBA-15 is changed to 2.5 to obtain a short mesoporous 2.5DCNH-Zr-SBA-15 molecular sieve for catalytic Biodiesel was synthesized with a product yield of 96.7%.

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Abstract

The invention discloses a method for catalyzing and synthesizing biodiesel by virtue of short mesoporous DCNH-Zr-SBA-15 molecular sieve organic solid alkali. A short mesoporous DCNH-Zr-SBA-15 molecular sieve organic solid alkali catalyst with high activity, large specific surface area and strong alkalinity is prepared by taking a SBA-15 molecular sieve as a carrier, doping Zr and introducing nucleophilic addition and hydroxyl condensation reaction of strong-alkalinity an organic guanidine compound DCNH and is used for catalyzing and synthesizing the biodiesel, so that the mass transfer diffusion resistance of grease molecules in a duct of the molecular sieve is effectively reduced, and the yield of the biodiesel is increased; and reaction conditions are mild, the catalyst can be conveniently separated, recycled and repeated used, and the biodiesel is high in leaching resistance and stability and has industrial application prospects.

Description

technical field [0001] The invention belongs to the field of fine chemical industry and relates to a method for synthesizing biodiesel with short mesoporous DCNH-Zr-SBA-15 molecular sieve organic solid base catalysis. Background technique [0002] Biodiesel is an environmentally friendly green renewable energy. At present, biodiesel is mainly synthesized by transesterification reaction of animal and vegetable oils as raw materials with low-carbon methanol and ethanol under the action of a catalyst. Homogeneous acid, base catalyst such as H 2 SO 4 , KOH and NaOCH 3 There is a certain corrosiveness or saponification and emulsification phenomenon, and the subsequent neutralization and washing of the product will produce a large amount of waste water, causing environmental pollution. The heterogeneous solid base catalyst catalyzed transesterification reaction can not only avoid the problems existing in the homogeneous reaction, but also have mild reaction conditions, the cat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38C11C3/10C10L1/02
CPCB01J31/38C10L1/02C11C3/10Y02E50/10
Inventor 刘跃进骆战涛李勇飞祝一帆王亮陈雪梅
Owner XIANGTAN UNIV
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