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Method for catalytic synthesis of biodiesel by means of hydrotalcite-like immobilized potassium fluoride solid alkalies

A solid base catalyst, a technology for synthetic biology, applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, catalysts for physical/chemical processes, etc., can solve problems such as poor reusability of catalysts

Active Publication Date: 2018-01-05
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, impregnating and loading fluoride with hydrotalcite or hydrotalcite-like composite metal oxide, and then impregnating and loading at 500°C for high-temperature roasting is easy to damage the layered structure of hydrotalcite-like compounds, and the reusability of the catalyst is not good.

Method used

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  • Method for catalytic synthesis of biodiesel by means of hydrotalcite-like immobilized potassium fluoride solid alkalies
  • Method for catalytic synthesis of biodiesel by means of hydrotalcite-like immobilized potassium fluoride solid alkalies
  • Method for catalytic synthesis of biodiesel by means of hydrotalcite-like immobilized potassium fluoride solid alkalies

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Experimental program
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Effect test

Embodiment 1

[0023] 1. Preparation of solid base KF / MgAlLa

[0024] Mg(NO 3 ) 2 .6H 2 O, Al(NO 3 ) 3 .7H 2 O, La(NO 3 ) 3 .6H 2 O was added into the reactor according to the molar ratio of Mg, Al, and La at 1:0.27:0.07 and stirred and mixed, and then urea with a molar ratio of 0.2 times the nitrate ion and deionized water with a molar ratio of 5 times the total metal ion were added. After continuing to stir the mixed solution for 10 hours, the mixed solution was transferred to a hydrothermal kettle for crystallization at 100°C for 24 hours to form a white precipitate, which was filtered and washed with water. The filter cake was dried in a 55°C constant temperature box for 12 hours, and then placed in a box In the Furnace, the temperature was raised to 500°C at a heating rate of 1-3°C / min, and roasted at this temperature for 4 hours. After cooling, a mesoporous hydrotalcite-like layered carrier MgAlLa was obtained, with a pore size of 8-13nm. Pore ​​volume 0.06~0.13cm 3 / g, speci...

Embodiment 2

[0027] Embodiment 2 operating steps are with implementation case 1, but do not add La(NO 3 ) 3 .6H 2 The molar ratio of O, Mg and Al is 1:0.3, and the solid base is 10% KF / Mg 1 Al 0.3 , the mass yield of biodiesel product was 96.18%.

Embodiment 3

[0028] Embodiment 3 operation steps are the same as embodiment 1, but solid alkali 10%KF / Mg 1 Al 0.2 La 0.13 The molar ratio of Mg, A and La is 1:0.2:0.13, and the mass yield of biodiesel product is 91.25%.

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Abstract

The invention discloses a method for catalyzing grease and alcoholic substances to synthesize biodiesel by means of hydrotalcite-like immobilized potassium fluoride solid alkalies including KF / MgAlLa,KF / MgAl and KF / MgLa. The solid alkalies are of mesoporous hydrotalcite-like layered structures, the pore diameter is 12-21 nm, the pore volume is 0.04-0.10 cm<3> / g, the specific surface area is 14-30m<2> / g, the alkalinity pKa is 9.3-15.0, the catalytic activity is high, the solid alkalies are easily detached from a reaction system, the repeatability is good, the mass yield of the catalytic synthesis of the biodiesel is 99.1%, and the mass yield of the catalytic synthesis of the biodiesel after the catalyst is reused for 5 times is 80.9%.

Description

technical field [0001] The invention belongs to the field of biomass energy catalysis, and relates to a method for catalytically synthesizing biodiesel with a hydrotalcite-like solid-carrying potassium fluoride solid base. Background technique [0002] Biodiesel is a fatty acid monoalkyl ester obtained by transesterification of animal and vegetable oils (fatty acid triglycerides) and alcohols (methanol or ethanol), the most typical being fatty acid methyl ester. Compared with traditional petrochemical energy, it has low content of sulfur and aromatics, high flash point, high cetane number, and good lubricity. It can be partially added to fossil diesel, and has attracted widespread attention as a renewable energy source. Commonly used catalysts include homogeneous catalysts and heterogeneous catalysts. Homogeneous acid-base has uniform catalytic strength and high catalytic efficiency, but there are problems such as complicated separation, equipment corrosion, acid-base treat...

Claims

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Application Information

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IPC IPC(8): C10G3/00B01J27/138B01J37/10B01J37/08B01J37/02B01J35/10
CPCY02E50/10Y02P30/20
Inventor 李勇飞陈雪梅刘跃进刘宁王亮余琼
Owner XIANGTAN UNIV
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