Method for preparation of long-chain alkane from unsaturated fatty acid at zero hydrogen consumption

Abstract

The invention discloses a method for preparation of long-chain alkane from unsaturated fatty acid at zero hydrogen consumption. The method includes: 1) adding unsaturated fatty acid and a non-noble metal catalyst in a mass ratio of 4:1-20:1 into a high temperature and high pressure reaction kettle; 2) conducting heating to 300-390DEG C to carrying out reaction for 1-8h; 3) cooling the reaction product, dissolving the product in an organic solvent, and performing filtering to obtain a liquid product and a solid catalyst; and 4) subjecting the catalyst to cleaning and regeneration for reuse. The catalyst is a double-active non-noble metal loaded catalyst, is prepared by co-precipitation method or impregnation method, and is regenerated by reduction calcination in hydrogen. According to the invention, solvent is unnecessary in the reaction process, the energy consumption is low, and the emission is little. The non-noble metal catalyst can effectively catalyze in-situ hydrogen transfer and non-hydrogen decarboxylation reaction, the catalyst is low in cost and is easy to recover, and the process is simple and green, and has zero hydrogen consumption.

Description

technical field [0001] The invention relates to a method for preparing long-chain alkanes, in particular to a method for preparing long-chain alkanes with zero hydrogen consumption using unsaturated fatty acids as raw materials. Background technique [0002] With the development of the world economy, the demand and consumption of energy are increasing, while the reserves of fossil energy are decreasing day by day. At the same time, the use of fossil fuels emits a large amount of carbon dioxide, toxic gases and particles, which has a serious impact on the global climate and environment. Against the background of fossil energy shortage and increasingly serious environmental problems, countries have sought various means to reduce their dependence on fossil energy and enhance their own energy security through diversification of energy supply. [0003] In recent years, countries all over the world are facing the crisis of global warming caused by greenhouse gases. At the Copenh...

AI Technical Summary

Problems solved by technology

However, the fatty acids obtained from the hydrolysis of fats and oils contain a large amount of unsaturated fatty acids (40-60%), and there is still considerable hydrogen consumption.

At present, the efficiency of non-hydrogen decarboxylation reaction using unsaturated fatty acid as raw material is low, and the yield of alkanes or alkenes is very low. Therefore, the hydrolysis-decarboxylation method needs to hydrogenate the fatty acid obtained by hydrolysis first, and then decarboxylate to prepare long-chain alkanes.

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