Method for using non-noble metal catalyst to catalyze decarboxylation of saturated fatty acid to prepare long-chain alkane

Abstract

The invention discloses a method for using non-noble metal catalyst to catalyze decarboxylation of saturated fatty acid to prepare long-chain alkane. The method includes: 1) adding saturated fatty acid and a non-noble metal catalyst into a high-temperature and high-pressure reaction kettle; 2) conducting heating to 300-390DEG C to carry out decarboxylation for 0.5-8h; 3) cooling the decarboxylation product, conducting dissolving by an organic solvent, and performing filtering to obtain a liquid product and a solid catalyst; and 4) cleaning and regenerating the non-noble metal catalyst for reuse. The non-noble metal catalyst is prepared by a co-precipitation method or impregnation method, and the catalyst is regenerated through reductive calcination in hydrogen. The reaction process involved in the invention has the characteristics of no need for a solvent, low energy consumption, and zero emission. The non-noble metal catalyst can effectively catalyze decarboxylation, the catalyst is low in cost and is easy to recover, and the process is simple and green.

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 by catalyzing the decarboxylation of saturated fatty acids with a non-noble metal catalyst under the condition of no solvent and no hydrogen. Background technique [0002] Alkanes, that is, saturated hydrocarbons, are only composed of carbon, hydrogen, carbon-carbon single bonds, and carbon-hydrogen single bonds. They are the simplest organic compounds and are divided into paraffins and cycloalkanes. Paraffins refer to alkanes whose carbon atoms are combined into a chain (straight chain or branched chain) with single bonds, and the general chemical formula is C n h 2n+2 (n≥1). Cycloalkanes refer to alkanes containing an alicyclic structure, and the general formula of cycloalkanes with a single ring structure is C n h 2n (n≥3). Generally, long-chain alkanes refer to alkanes with a carbon chain length greater than 10, and lo...

AI Technical Summary

Problems solved by technology

[0010] At present, the research of non-hydrogen decarboxylation method is focused on noble metal catalysts. The use of noble metal catalysts such as Pt and Pd has good activity for fatty acid decarboxylation reaction, but the cost is too high to achieve industrialization.

In terms of the use of reaction solvents, the research on non-hydrogen decarboxylation method mainly focuses on dodecane and water, and there is very little research on decarboxylation under solvent-free conditions with low energy consumption.

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