Solid base catalyst for synthesizing biodiesel and preparation method and application thereof

Abstract

The invention discloses preparation of anion-modified solid base and application of the same in biodiesel preparation reaction by a catalytic ester interchange method. The catalyst is directly prepared from metal nitrate, metal oxide and ammonium halide under the alkaline condition by a one-step method. The preparation method is simple to operate, and the catalyst has low cost. In the biodiesel preparation reaction by the ester interchange method, the catalyst has high catalytic activity, good reusability and mild reaction conditions, and does not pollute the environment.

Description

technical field [0001] The invention relates to a solid base catalyst for synthesizing biodiesel, a preparation method and application. Background technique [0002] Biodiesel is an environmentally friendly renewable fuel that can be used instead of regular diesel. It has the advantages of renewable, degradable, non-toxic, high flash point, high cetane number, and environmentally friendly. Its popularization and use will provide an ideal substitute for increasingly depleted fossil raw materials, and can effectively reduce the emission of greenhouse gases. [0003] At present, most biodiesel is prepared by homogeneous transesterification reaction. Although the catalytic efficiency is very high, it is difficult to separate the catalyst from the product, and a large amount of waste acid and lye pollute the environment. The use of a solid catalyst instead of a homogeneous catalyst makes it easy to separate the product from the catalyst, avoids the discharge of a large amount o...

AI Technical Summary

Problems solved by technology

At present, the solid base catalysts that have been studied more include hydrotalcite and hydrotalcite-supported potassium fluoride, KF / Al 2 o 3 , oxides of alkali metals or alkaline earth metals, oxides of rare earth metals, and basic anion exchange resins, etc., but the preparation process of these catalysts is relatively complicated, the cost is expensive, and the strength is poor

Among them, solid alkali catalysts containing alkali metals are likely to cause the loss of alkali metal active components during use and pollute the product; supported catalysts have to go through cumbersome processes such as carrier preparation and impregnation, which consumes time and energy and wastes a lot of raw materials.