Method of preparing biodiesel by catalyzing cottonseed oil with KOH-K2CO3-Al2O3 solid mixed base

Abstract

The invention discloses a method of preparing biodiesel by catalyzing cottonseed oil with KOH-K2CO3-Al2O3 solid mixed base. The method comprises the following steps of preparing a KOH-K2CO3-Al2O3 solid mixed base catalyst; refining cottonseed oil sold on market; and preparing biodiesel through catalysis of the solid mixed base catalyst. According to the method, KOH and K2CO3 are the sources of base, Al2O3 is a carrier, the KOH, K2CO3 and Al2O3 are used to prepare the solid mixed base catalyst through an impregnation method and a coprecipitation-impregnation method, the conversion rate in preparation of biodiesel by catalyzing cottonseed oil reaches 96%, after the catalyst is reused for five times, the solid mixed base catalyst prepared through the impregnation method keeps the conversion rate of cottonseed oil at around 66%, but the solid mixed base catalyst prepared through the coprecipitation-impregnation method keeps the conversion rate of cottonseed oil at around 87%.

Description

technical field [0001] The invention relates to the technical field of biodiesel preparation. Specifically KOH-K 2 CO 3 -Al 2 o 3 A method for preparing biodiesel from cottonseed oil catalyzed by solid mixed bases. Background technique [0002] In recent years, my country's investment in and support for green energy and new energy has been huge. Therefore, biodiesel, as a renewable and low-pollution green energy, has also made great progress again and has a good market prospect. As a country with huge cotton production, my country also produces a large amount of cottonseed oil as a by-product. With the steady development of our country towards a comprehensive well-off society, people's living standards have also greatly improved, and the proportion of cottonseed oil consumed as edible oil has also gradually decreased. Therefore, it can be The use of renewable cottonseed oil as a raw material for the production of biodiesel also has broad market prospects. [0003] At pr...

AI Technical Summary

Problems solved by technology

The catalytic effect of a solid base catalyst is directly related to the strength of the base loaded on the carrier, so the type of base selected directly determines the performance of the catalyst. Now the main supported bases are alkali metals, alkali metal hydroxides, carbonates, Fluoride, nitrate, acetate and other Lewis bases, among which alkali metal hydroxides and carbonates are the most representative, have been widely studied, but it is found that catalysts with a single load of alkali metal hydroxides are easily H in the air 2 O or CO 2 Pollution, and side reactions caused by too strong alkalinity, such as the increase of the reaction rate of saponification reaction reduces the conversion rate, and the conversion rate of the transesterification reaction is not ideal due to the weaker alkalinity of the catalyst of the single-loaded carbonate. Affected the conversion rate of biodiesel

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