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Method for preparing alkane by high fatty acid ester

A technology for preparing alkanes from fatty acid esters and deoxygenation, which is applied in the field of catalysis, can solve the problems of cumbersome preparation process and low calorific value of products, and achieve the effects of simple preparation process, high combustion calorific value, and easy recycling

Inactive Publication Date: 2009-12-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of the catalysts used in the reported literature and patents is cumbersome, the reaction needs to be carried out under high temperature and high pressure, and the decarboxylation process is often accompanied by cracking of carbon chains, so the calorific value of the product is low, and aromatics are generated during the reaction process, so it is easy to be in the catalyst. Adsorption on active sites leads to carbon deposition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Catalyst preparation

[0015] 6M HNO in an 80°C oil bath 3 Oxidize the multi-walled carbon nanotubes for 2 hours, then filter, wash with water until neutral, and dry at 120°C; take the above-mentioned oxidized carbon nanotubes, add 70mL of water, and ultrasonically disperse; the mass percentage is 2-10% The palladium is the active component by adding H 2 PdCl 4 solution, stirred evenly, added formaldehyde solution, adjusted the pH value to 9 with 1M NaOH solution, stirred for 25 minutes, filtered, washed with a large amount of water, and dried to obtain a Pd / MWCNTs catalyst.

Embodiment 2

[0017] Preparation of Heptadecane and Octadecane by Hydrodeoxygenation of Methyl Stearate

[0018] Add 2.5g of methyl stearate, 0.3g of Pd / MWCNTs catalyst and 30mL of n-hexane into a 100mL reaction kettle, fill it with hydrogen, start the stirring and heating at an initial hydrogen pressure of 2.5MPa, and stop the reaction after reacting at 280°C for 6 hours. After room temperature, the catalyst was isolated by filtration. Quantitative detection of the product by gas chromatography shows that the conversion rate of the raw material methyl stearate can reach 98%, and the total yield of the product (heptadecane and octadecane) can reach 75%.

Embodiment 3

[0020] Preparation of Pentadecane and Hexadecane by Hydrodeoxygenation of Methyl Palmitate

[0021] Add 2.0g of methyl palmitate, 0.3g of Pd / MWCNTs catalyst and 30mL of n-heptane into a 100mL reaction kettle, fill it with hydrogen, start the stirring and heating at an initial hydrogen pressure of 3.2MPa, and stop the reaction after reacting at 260°C for 5h, and wait to cool to After room temperature, the catalyst was isolated by filtration. Quantitative detection of the product by gas chromatography shows that the conversion rate of the raw material methyl palmitate can reach 97%, and the total yield of products (pentadecane and hexadecane) can reach 84%.

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PUM

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Abstract

The invention discloses a method for preparing alkane by high fatty acid ester, which is characterized in that liquid-phase catalytic hydrogenation deoxidation is carried out on the high fatty acid ester to obtain the alkane. The high fatty acid ester, catalyst and solvent are added into a reactor, then hydrogen is charged into the reactor with reaction pressure at 1-10MPa and temperature at 210-320 DEG C, and the reaction time is 4-7h; the high fatty acid ester is fatty acid methyl ester containing 8-22 carbon atoms or fatty acid ethyl ester containing 8-22 carbon atoms; catalyst uses a multi-wall carbon nanotube as carrier and 2-10% of palladium in percentage by weight as active component ; the solvent is one of n-hexane, n-heptane, n-octane, dodecane, or hexadecane. In the invention, the preparation process is simple, the reaction temperature is low, the usage of solvent is less, the combustion high value of the target product is high, and the catalyst can be recycled.

Description

technical field [0001] The invention relates to a method for generating high calorific value alkanes through liquid-phase catalytic hydrodeoxygenation of higher fatty acid esters, which belongs to the technical field of catalysis. Background technique [0002] With the increasing shortage of non-renewable energy sources such as coal, oil, and natural gas worldwide, the development and utilization of renewable biomass resources has attracted people's attention. Animal and vegetable oils are mainly composed of saturated or unsaturated fatty acid esters. The technology of using solid acid and alkali catalysts to catalyze the transesterification of animal and vegetable oils with methanol or ethanol to prepare biodiesel has been widely studied. Diesel is primarily methyl or ethyl esters of long-chain fatty acids. Biodiesel is a renewable and clean energy without sulfur, but compared with diesel, it has high oxygen content, high viscosity, and low combustion calorific value, so i...

Claims

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Application Information

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IPC IPC(8): C10G3/00B01J23/44C07C1/207C07C9/22C07C9/15
CPCY02P20/584Y02P30/20
Inventor 楼辉韩军兴李望孙辉丁宇琦段谨钊郑小明
Owner ZHEJIANG UNIV
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