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

An electrocatalytic film and alcohol oxidation technology, which is applied in the electrolysis process, electrolysis components, electrolysis organic production, etc., can solve the problems of low solar energy utilization rate and difficult separation and recovery of photocatalysts, so as to maintain continuous high efficiency, avoid side reactions, The effect of simple equipment and process

Active Publication Date: 2014-07-09
TIANJIN POLYTECHNIC UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, photocatalysts also have problems such as difficult separation and recovery, and low utilization rate of solar energy.

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

Examples

Experimental program
Comparison scheme
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 electrocatalytic selective oxidation synthesis, in particular to a method for preparing corresponding aldehydes or acids by catalytically oxidizing alcohols with electrocatalytic membranes with high efficiency and high selectivity. The invention couples electrocatalytic oxidation with membrane separation technology, uses alcohols to synthesize aldehydes or acids as a research system, uses electrocatalytic membranes as anodes, and connects auxiliary electrodes with DC stabilized power supplies through wires to form electrocatalytic membrane reactors . In an aqueous solution containing alcohol reactants and electrolytes, by adjusting the operating parameters in the membrane reactor, including operating voltage and current density, under the action of a low-voltage electric field (1-6V), the surface of the membrane is induced to generate active oxygen species such as hydroxyl radicals to achieve Controlled and efficient oxidation of alcohols to aldehydes or acids. Compared with the traditional process, the present invention has the advantages of low energy consumption, simple operation, high selectivity, controllable process, etc., is suitable for industrial implementation, and can be widely used in the controllable preparation of catalytic oxidation in the field of organic synthesis.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/02C25B3/23
Inventor 王虹李建新杨阳李娇
Owner TIANJIN POLYTECHNIC UNIV
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