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Method for synthesizing ethanol

A technology supported by ethanol and alumina, applied in chemical instruments and methods, preparation of organic compounds, preparation of hydroxyl compounds, etc., can solve the problems of low ethanol selectivity and yield, cumbersome catalyst separation and recovery process, expensive catalysts, etc. Achieve high selectivity and yield

Active Publication Date: 2013-09-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the research on direct ethanol production has gone through nearly a century, it still faces severe challenges
Although the homogeneous catalytic process can obtain high ethanol selectivity, the practical application of this process is limited due to the use of expensive catalysts, high operating pressure and cumbersome catalyst separation and recovery processes.
For heterogeneous catalytic processes, ethanol selectivity and yield are low due to kinetically limited C-C bond formation and rapid carbon chain growth of intermediates containing two carbon atoms

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Preparation of alumina supported palladium catalyst: Weigh 5g α-Al 2 O 3 , Weighing 0.063g Pd(NO 3 ) 2 ·2H 2 O is prepared as an immersion liquid, the solvent is deionized water, and the specific surface area is 15m 2 / g carrier α-Al 2 O 3 Soak in the dipping solution for 10 hours, evaporate the water at 80°C to obtain a solid, then dry the solid at 120°C for 12 hours and calcinate at 400°C for 2 hours to obtain an alumina supported palladium catalyst (Pd / α-Al 2 O 3 ).

[0019] (2) Preparation of dimethyl oxalate: The inner diameter of the stainless steel fixed-bed reactor is 8mm, the amount of the alumina supported palladium catalyst is 2ml, and the catalyst is reduced with 50ml / min CO at 350°C for 2h before use. The raw material gas carbon monoxide and methyl nitrite (wherein, methyl nitrite is prepared according to the document US 4353843) passes through the reactor from top to bottom (the volume ratio of carbon monoxide and methyl nitrite is 1.4:1), the volume of the...

Embodiment 2

[0023] According to Example 1, the alumina supported palladium catalyst, dimethyl oxalate and silica supported copper catalyst were prepared;

[0024] In the ethanol preparation step, the reaction temperature is 280°C, the molar ratio of hydrogen to dimethyl oxalate is 350, and the residence time is 5.7s (under standard conditions). Other conditions are the same as in Example 1. The conversion rate of dimethyl oxalate is 100%. The selectivity of ethanol is 83%, the selectivity of n-propanol is 12%, and the selectivity of isopropanol is 1%.

Embodiment 3

[0026] According to Example 1, the alumina supported palladium catalyst, dimethyl oxalate and silica supported copper catalyst were prepared;

[0027] In the ethanol preparation step, the reaction temperature is 290℃, the residence time is 3s (under standard conditions), other conditions are the same as in Example 2, the conversion rate of dimethyl oxalate is 100%, the selectivity of ethanol is 75%, and the selection of n-propanol The performance is 7% and the selectivity of isopropanol is 5%.

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Abstract

The invention discloses a method for synthesizing ethanol, which comprises the following steps of: 1, preparing oxalic acid diester through coupling reaction of carbon monoxide and nitrite under the catalysis of an alumina-supported palladium catalyst; 2, pre-heating and vaporizing the oxalic acid diester and mixing with hydrogen; carrying out catalytic hydrogenation reaction on the mixed gas on a silicon dioxide-supported copper catalyst, and then cooling and distilling the reaction product to obtain ethanol. The preparation method of the invention realizes over 80% of selectivity and high yield of ethanol, and the gas used in synthesis process can be completely converted through circulation, thereby establishing a good foundation for research on the industry of synthesizing ethanol from biomass.

Description

Technical field [0001] The invention belongs to the technical field of organic synthesis, and in particular relates to a method for synthesizing ethanol. Background technique [0002] Ethanol, commonly known as alcohol, is a clean fuel. The development of fuel alcohol and other petroleum substitutes and the adoption of measures to save petroleum resources are one of the key points of the "Tenth Five-Year Plan". Automobile ethanol gasoline is a new type of automobile fuel formed by mixing denatured fuel ethanol and gasoline in a certain proportion. It can effectively improve the performance and quality of oil products and reduce the emission of major pollutants such as carbon monoxide and hydrocarbons without affecting the driving performance of the car. Ethanol gasoline, as a new type of clean fuel, is currently the focus of renewable energy development in the world and is in line with my country's energy substitution strategy and the development direction of renewable energy. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/08C07C29/149
Inventor 王树荣骆仲泱岑可法方梦祥王勤辉周劲松倪明江
Owner ZHEJIANG UNIV
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