Method for preparing aldehydes or acids by selectively performing catalytic oxidation on alcohols by electro-catalysis membrane

An electrocatalytic membrane and alcohol oxidation technology, applied in the electrolysis process, electrolysis components, electrolysis organic production and other directions, can solve the problems of low utilization rate of solar energy, difficult separation and recovery of photocatalysts, etc., to maintain continuous high efficiency, avoid side reactions, Simple effect of equipment and process

Active Publication Date: 2012-06-13
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

However, photocatalysts also have problems such as difficult se

Method used

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  • Method for preparing aldehydes or acids by selectively performing catalytic oxidation on alcohols by electro-catalysis membrane
  • Method for preparing aldehydes or acids by selectively performing catalytic oxidation on alcohols by electro-catalysis membrane
  • Method for preparing aldehydes or acids by selectively performing catalytic oxidation on alcohols by electro-catalysis membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0020] In this example, acetic acid is prepared from ethanol: a 0.05 mol / L ethanol aqueous solution is prepared and placed in a membrane reactor, and 7 g / L NaOH is added as an electrolyte. Under normal temperature and pressure, the working voltage is 1.5V and the current density is 0.9mA / cm 2 Under the conditions, the electrocatalytic membrane is used to catalyze the oxidation of ethanol to synthesize acetic acid. Gas chromatography-mass spectrometry was used to qualitatively and quantitatively detect the permeate of the reactor to obtain the conversion rate and yield of the reactant. In this experiment, the conversion rate of ethanol was 96.2%, and the yield of acetic acid was 88.7%.

Embodiment 2

[0022] This example prepares propionic acid from propanol: prepare 0.03mol / L propanol aqueous solution and place it in a membrane reactor, add 5g / L NaHCO 3 as an electrolyte. Under normal temperature and pressure, the working voltage is 2.3V and the current density is 0.95mA / cm 2 Under these conditions, an electrocatalytic membrane was used to catalyze the oxidation of propanol to propionic acid. Gas chromatography-mass spectrometry was used to qualitatively and quantitatively detect the permeate of the reactor to obtain the conversion rate and yield of the reactant. The conversion rate of propanol in this experiment reaches 92.95%, and the productive rate of propionic acid reaches 79.83% (as figure 2 ).

Embodiment 3

[0024] This embodiment prepares butyric acid from butanol: prepare 0.1mol / L butanol aqueous solution and place it in the reactor, add 10g / LNa 2 CO 3 as an electrolyte. Under normal temperature and pressure, the working voltage is 3.5V and the current density is 10.0mA / cm 2 Under these conditions, the electrocatalytic membrane was used to catalyze the oxidation of butanol to synthesize butyric acid. Gas chromatography-mass spectrometry was used to qualitatively and quantitatively detect the permeate of the reactor to obtain the conversion rate and yield of the reactant. In this experiment, the conversion rate of butanol reached 98.84%, and the yield of butyric acid was 21.7%.

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Abstract

The invention relates to the technical field of electro-catalysis selective oxidation synthesis, in particular to a method for preparing corresponding aldehydes or acids by performing catalytic oxidation on alcohols by an electro-catalysis membrane effectively at high selectivity. Electro-catalytic oxidation and a membrane separation technology are coupled, a system that aldehydes or acids are synthesized by using alcohols is used as a research system, and the electro-catalysis membrane used as an anode and an auxiliary electrode are connected through a guide line and a direct-current stabilized power supply to form an electro-catalysis membrane reactor. In an aqueous solution containing alcohol reactants and electrolyte, operation parameters comprising working voltage and current density in the membrane reactor are controlled and adjusted, and the surface of the membrane is introduced to generate reactive oxygen species such as hydroxyl radicals and the like under the action of a low-voltage electric field (1-6V), so the aldehydes or acids can be controllably and efficiently prepared by using the alcohols. Compared with the conventional process, the method has the advantages of low energy consumption, high selectivity, controllable process and the like, is easy to operate, can be industrially implemented, and can be widely used for catalytic oxidation controllable preparation in an organic synthesis field.

Description

technical field [0001] The invention relates to the technical field of electrocatalytic selective oxidation synthesis, in particular to a method for preparing corresponding aldehydes or acids by utilizing electrocatalytic membranes to oxidize alcohols with high efficiency and high selectivity. Background technique [0002] Organic synthesis has irreplaceable importance in various fields such as food, medicine, materials, and chemical industry. Oxidation of alcohols to the corresponding aldehydes, ketones, or carboxylic acids is one of the most versatile functional group transformation reactions in organic synthesis. The world-wide production of carbonyl compounds by the metered oxidation of alcohols exceeds one million tons per year. Traditional organic synthesis is prepared by metering oxidants, but the cost is expensive, and the reagents are often toxic and harmful, and there are many by-products, which are difficult to separate from the products. With the increasing con...

Claims

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Application Information

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IPC IPC(8): C25B3/02C25B3/23
Inventor 王虹李建新杨阳李娇
Owner TIANJIN POLYTECHNIC UNIV
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