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A method for efficient decarboxylation of saturated fatty acids

A fatty acid and high-efficiency technology, applied in the field of efficient decarboxylation of saturated fatty acids, which can solve the problems of hydrogen consumption and slow reaction rate

Active Publication Date: 2021-07-30
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem of hydrogen consumption in the existing hydrogen-facing hydrothermal technology and the slow reaction rate of non-hydrogen-facing hydrothermal technology, and provides a method for efficient decarboxylation of saturated fatty acids

Method used

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  • A method for efficient decarboxylation of saturated fatty acids

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add 10g stearic acid, 1g glycerol, 1g 5wt%Ru / C catalyst, 160g H 2 O, and sealed, filled with N into the reactor 2 , keep the initial pressure at 2MPa, and the stirring rate at 500rpm. Heat up to 350°C for 1 h. After the reaction is finished, the reaction product is cooled to room temperature, dissolved in dichloromethane, and filtered to obtain a liquid phase product and a solid catalyst, and the obtained liquid phase product is separated by standing to obtain oil in the organic phase and water in the inorganic phase. The organic phase that separates obtains is analyzed with GC / FID after dichloromethane constant volume, calculates that stearic acid transformation rate is 100.0%, the yield of long-chain alkane (the ratio of the amount of long-chain alkane substance and the amount of reactant substance ) is 87.01%, and the mass proportion of each alkane in the long-chain alkane is shown in Table 1.

Embodiment 2

[0047] Add 10g palmitic acid, 2g urea, 0.5g 5wt%Ru / ZrO 2 Catalyst, 80g H 2 O, and seal, fill He in the reactor, keep initial pressure as 1MPa, stirring rate is 700rpm. Heat up to 310°C for 8 hours. After the reaction is finished, the reaction product is cooled to room temperature, dissolved in dichloromethane, and filtered to obtain a liquid phase product and a solid catalyst, and the obtained liquid phase product is separated by standing to obtain oil in the organic phase and water in the inorganic phase. The organic phase that separates obtains is analyzed with GC / FID after dichloromethane constant volume, calculates that palmitic acid conversion rate is 100%, the yield of long-chain alkane (the ratio of the amount of long-chain alkane substance and the amount of reactant substance) is 90.25%.

Embodiment 3

[0049] Add 10g of stearic acid, 5g of palmitic acid, 2g of methanol, 1.5g of 5wt%Ru / Al in a 250mL batch type high temperature and high pressure reactor 2 o 3 Catalyst, 150g H 2 O, and sealed, filled with Ar in the reactor, to maintain the initial pressure of 5MPa, stirring rate of 500rpm. Heat up to 300°C for 2 hours. After the reaction is finished, the reaction product is cooled to room temperature, dissolved in dichloromethane, and filtered to obtain a liquid phase product and a solid catalyst, and the obtained liquid phase product is separated by standing to obtain oil in the organic phase and water in the inorganic phase. The organic phase that separates obtains is analyzed with GC / FID after dichloromethane constant volume, calculates that stearic acid conversion rate is 100%, palmitic acid conversion rate is 100%, the yield of long-chain alkane (the amount of long-chain alkane substance The ratio to the amount of reactant species) was 95.67%.

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Abstract

The invention relates to the field of renewable energy, in particular to a method for decarboxylation of saturated fatty acids. It uses a more economical Ru-supported catalyst under non-hydrogen-facing conditions, uses a hydrogen-donating agent to reform the in-situ hydrogen, and uses a hydrothermal process to achieve decarboxylation of saturated fatty acids. After the reaction, the solid-liquid two-phase is filtered The separation can be realized, the organic phase and the water phase are also easily separated, and the separation of mixed alkanes in the organic phase is convenient and fast. Among them, after the Ru-supported catalyst is used, it can continue to be reused after regeneration, and the resulting mixed alkanes can be used as lubricating oil Base oil, diesel fuel, jet fuel or gasoline are of great significance to the development and utilization of renewable resources.

Description

technical field [0001] The invention relates to the field of renewable energy, in particular to a method for highly efficient decarboxylation of saturated fatty acids. Background technique [0002] Fatty acid decarboxylation is of great significance in the field of renewable energy and is an important step in the preparation of mixed alkanes to replace fossil fuels. [0003] At present, there are two main processes for the decarboxylation of fatty acids under hydrothermal conditions: hydrothermal catalytic process with hydrogen and non-hydrothermal catalytic process with hydrogen. The hydrothermal catalytic process requires a large amount of hydrogen. The high-purity hydrogen in the reactor can greatly increase the decarboxylation rate of fatty acids. However, at present, industrial hydrogen is mainly produced through coal chemical industry, and the consumption of hydrogen indirectly leads to the consumption of fossil fuels. Therefore, the process of decarboxylation of fatt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G3/00
CPCY02P30/20
Inventor 张静姚潇毅赵志伟曾宪鹏崔福义
Owner CHONGQING UNIV