Method for catalyzing and synthesizing biodiesel by virtue of short mesoporous DCNH-Zr-SBA-15 molecular sieve

A technology for synthesizing biology and molecular sieves, applied in chemical instruments and methods, biofuels, chemical/physical processes, etc., can solve the problems of easy loss of active components, low catalyst surface, low reusability, etc., to achieve easy separation and recovery and Repeated use, good loss resistance, and the effect of reducing mass transfer and diffusion resistance

Active Publication Date: 2017-08-18
XIANGTAN UNIV
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  • Abstract
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  • 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

Method used

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  • Method for catalyzing and synthesizing biodiesel by virtue of short mesoporous DCNH-Zr-SBA-15 molecular sieve
  • Method for catalyzing and synthesizing biodiesel by virtue of short mesoporous DCNH-Zr-SBA-15 molecular sieve
  • Method for catalyzing and synthesizing biodiesel by virtue of short mesoporous DCNH-Zr-SBA-15 molecular sieve

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0032] Example 1

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

[0034] Dicyclohexylcarbodiimide (DCC) and the silane coupling agent 3-aminopropyltriethoxysilane (APTES) were refluxed at 120°C for 40h in toluene, an aprotic solvent, to achieve the nucleophilic addition reaction of imines. After the organic solvent is distilled off under reduced pressure, a 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℃, 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, and then add ethyl orthosilicate (TEOS) to the above mixed solution, where 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. After stirri...

Example Embodiment

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

Example Embodiment

[0040] Example 3 The operation steps are the same as in Example 1, but the mass ratio of the strong basic organic guanidine compound DCNH to Zr-SBA-15 is changed to 2.5 to prepare a short mesoporous 2.5DCNH-Zr-SBA-15 molecular sieve for catalysis Synthesizing biodiesel, the product yield is 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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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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