Method for preparing alkane by hydrogenating and photo-catalyzing fatty acid decarboxylation

A technology of fatty acid and palm oil fatty acid, which is applied in the field of hydrogenation photocatalytic decarboxylation of fatty acid to prepare long-chain alkanes, can solve the problems of low conversion efficiency, limited substrate universality, harsh reaction conditions, etc., and achieve low hydrogen consumption and high yield High and stable effect

Active Publication Date: 2020-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] The significance of the present invention is to overcome the shortcomings of the prior art for the preparation of alkanes from fatty acids, such as: harsh reaction conditions, low conversion efficiency, limited substrate universality, etc., under mild reaction conditions, through hydrogenation and photocatalytic decarboxylation in series Step, one-pot conversion of fatty acids to long-chain alkanes

Method used

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  • Method for preparing alkane by hydrogenating and photo-catalyzing fatty acid decarboxylation
  • Method for preparing alkane by hydrogenating and photo-catalyzing fatty acid decarboxylation
  • Method for preparing alkane by hydrogenating and photo-catalyzing fatty acid decarboxylation

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Effect test

Embodiment 1

[0024] Add 1.5mL of linoleic acid acetonitrile solution (concentration is 10g / L) and Pt / TiO 2 (1wt%) 10mg, the atmosphere in the reaction tube was replaced with hydrogen (0.1MPa), sealed, stirred at 25°C for 1h, and then reacted for 2.0h under the irradiation of LED (center wavelength 365nm, 18W), the reaction temperature was 25°C, and the chromatographic Detection of product, product mass spectrum and standard spectrum Figure 1 As a result, the yield of heptadecane was 95%.

Embodiment 2

[0026] Add 1.5mL of linoleic acid acetonitrile solution (concentration is 10g / L) and Pd / TiO 2 (1wt%) 10mg, replace the atmosphere in the reaction tube with hydrogen (0.1MPa), seal it, stir at 25°C for 1h, then react for 2.0h under the irradiation of LED (center wavelength 365nm, 18W), the reaction temperature is 25°C, and the chromatogram Detection of product, product mass spectrum and standard spectrum Figure 1 As a result, the yield of heptadecane was 81%.

Embodiment 3

[0028] Add 1.5mL of linoleic acid in acetonitrile solution (concentration: 10g / L) and Ru / TiO 2 (1wt%) 10mg, replace the atmosphere in the reaction tube with hydrogen (0.1MPa), seal it, stir at 60°C for 1h, then react for 2.0h under the irradiation of LED (center wavelength 365nm, 18W), the reaction temperature is 25°C, and the chromatogram Detection of product, product mass spectrum and standard spectrum Figure 1 As a result, the yield of heptadecane was 76%.

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Abstract

The invention relates to a method for preparing alkane by hydrogenating and photo-catalyzing fatty acid decarboxylation. According to the method, in the presence of hydrogen, a catalyst and a solvent,fatty acid is converted into the alkane by a one-pot method through a hydrogenation and photocatalytic decarboxylation series step, wherein the used catalyst is metal surface modified titanium dioxide. The reaction process is as follows: mixing the fatty acid, the solvent and the catalyst, putting the mixture into a quartz reactor, replacing the atmosphere in the reactor with low-pressure hydrogen (less than or equal to 0.5 MPa), sealing, stirring for a period of time at a certain temperature (20-100 DEG C) under the condition of no light, carrying out hydrogenation reaction, and carrying outdecarboxylation reaction under the irradiation of an external light source to generate the alkane. By using the method provided by the invention, efficient conversion of the fatty acid can be realized under mild conditions, and the yield of the alkane can be up to 96%. The catalyst and the reaction system are easy to separate after reaction and can be recycled for multiple times. The obtained alkane can be used for replacing traditional fossil diesel and aviation kerosene.

Description

technical field [0001] The invention relates to a preparation method of hydrocarbon compounds, in particular to a method for preparing long-chain alkanes by hydrogenation photocatalytic decarboxylation of fatty acids. [0002] technical background [0003] With the rapid development of society, the demand for energy is also increasing sharply. At present, the fossil energy that society mainly relies on is limited, and the process of refining and using will bring environmental pollution, CO 2 Therefore, developing renewable clean energy and reducing dependence on fossil energy can effectively alleviate the current energy and environmental pollution problems. Among them, the conversion of renewable biomass resources into liquid fuels has become a research hotspot in the field of energy. [0004] At present, the oil refining and paper industry produce a large amount of fatty acid by-products, and these fatty acids are mainly mixtures of unsaturated fatty acids, so these fatty a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/207C07C9/22
CPCC07C1/2078C07C2523/42C07C2523/46C07C2523/52C07C2523/50C07C9/22Y02P30/20
Inventor 王峰黄志鹏张超锋韩建宇高著衍
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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