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A method for preparing long-chain alkanes from unsaturated fatty acids with zero hydrogen consumption

A technology of unsaturated fatty acids and long-chain alkanes, which is applied in the field of preparation of long-chain alkanes, can solve the problems of low yield and low efficiency of alkanes or alkenes, and achieve the effects of low catalyst cost, low energy consumption, and easy recycling

Active Publication Date: 2017-05-03
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • A method for preparing long-chain alkanes from unsaturated fatty acids with zero hydrogen consumption

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Effect test

Embodiment 1

[0028] Add 200g hexadecenoic acid and 10g 10%Cu-30%Ni / ZrO in a 500mL batch autoclave 2 Catalyst, start stirring, heat up to 350 ℃ and react for 5 hours; after the reaction is completed, the reaction product is cooled, dissolved with acetone, and filtered; the liquid phase product is analyzed by GC-FID after constant volume with acetone, and the molar yield of long-chain alkanes is calculated as 61.2%.

Embodiment 2

[0030] Add 200g erucic acid and 16.7g 20%Zu-20%Co / ZrO in a 500mL batch autoclave 2 Catalyst, start stirring, heat up to 330 ℃ and react for 4 hours; after the reaction is completed, the reaction product is cooled, dissolved and filtered with acetone; the liquid phase product is analyzed by GC-FID after constant volume with acetone, and the molar yield of long-chain alkanes is calculated as 26.4%.

Embodiment 3

[0032] Add 200g eicosenoic acid and 25g 10%Cu-40%Ni / ZSM-5 catalyst into a 500mL intermittent high-pressure reactor, start stirring, and heat up to 370°C for 3 hours; after the reaction is completed, the reaction product is cooled and washed with acetone Dissolving and filtering; the liquid phase product was analyzed by GC-FID after constant volume with acetone, and the calculated molar yield of long-chain alkanes was 60.5%.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/207C07C9/22C07C9/14B01J23/755B01J23/80B01J29/46B01J23/75B01J23/745B01J23/889
CPCY02P20/584
Inventor 傅杰吴江华田秋容张子豪吕秀阳
Owner ZHEJIANG UNIV