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Hydrogen peroxide synthesizing device and method

A hydrogen peroxide, synthesis device technology, applied in chemical instruments and methods, peroxide/peroxyhydrate/peroxyacid/superoxide/ozonide, organic compound/hydride/coordination complex catalyst, etc. Direction, can solve the problems of decreased number of effective active sites, high risk factor, slow reaction rate, etc., to achieve the effect of improving reaction catalytic efficiency, improving reaction efficiency, and increasing local concentration

Active Publication Date: 2019-04-09
BEIJING MECHANICAL EQUIP INST
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Problems solved by technology

However, because the concentration of hydrogen and oxygen on the surface of the active component of the supported metal catalyst is limited by the solubility of the gas, the reaction rate is slow and the selectivity of hydrogen peroxide is low.
In addition, the active components of supported metal catalysts are prone to agglomeration during the reaction process, resulting in a decrease in the number of effective active sites.
[0004] At present, the direct synthesis of hydrogen peroxide from hydrogen and oxygen faces the following challenges in industrial applications: (1) The mixed explosion range of hydrogen and oxygen raw materials is wide, and the risk factor is high; (2) The solubility of hydrogen and oxygen in the reaction medium is small, resulting in reaction efficiency. It is difficult to meet the requirements of industrial production; (3) in the reaction process, side reactions such as hydrogen and oxygen directly generating water and hydrogen peroxide decomposition lead to low product selectivity

Method used

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  • Hydrogen peroxide synthesizing device and method

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[0059] Another embodiment of the present invention discloses a method for preparing a sandwich-structured NMPs-MOFs hybrid membrane: comprising the following steps:

[0060] Step 1: Prepare a precursor solution and a metal salt solution for preparing a metal organic framework, and mix the two in equal amounts to obtain a mixed solution;

[0061] Step 2: Pass the mixed solution for preparing the metal-organic framework into the microchannel of the hydrogen peroxide synthesis device, make it self-grow on the inner wall of the microchannel at a suitable temperature, and dry to obtain the bottom metal-organic framework membrane;

[0062] Step 3: preparing a metal salt solution for preparing metal nanoparticles;

[0063] Step 4: Prepare metal nanoparticles by liquid phase reduction method and coat them on the metal-organic framework membrane at the bottom of the reaction zone;

[0064] Step 5: Continue to pass the mixed solution for preparing the metal-organic framework into the m...

Embodiment 1

[0079] The Pt-Ni / ZIF-8 hybrid film was prepared by the following method:

[0080] Step 1: Add Zn(NO 3 ) 2 (12mmol) and 2-methylimidazole (25mmol) are dissolved in methanol (250mL) to prepare ZIF-8 precursor solution;

[0081] Step 2: Zn(NO 3 ) 2 (12mmol) was dissolved in deionized water (250mL) to prepare zinc nitrate aqueous solution;

[0082] Step 3: Take an equal amount of ZIF-8 precursor solution and zinc nitrate aqueous solution and mix thoroughly. At room temperature, pass the mixed solution into the microchannel formed by the fastening of the substrate and cover sheet. The time for passing the mixed solution is 80 minutes , and then washed with methanol and dried with nitrogen to obtain the bottom ZIF-8 film;

[0083] Step 4: Take H 2 PtCl 6 and Ni(NO 3 ) 2 As a precursor, Pt was prepared by liquid phase reduction method 1 Ni 3 metal nanoparticles, and Pt by spin-coating 1 Ni 3 Metal nanoparticles coated on the nascent ZIF-8 film;

[0084] Step 5: continue...

Embodiment 2

[0086] Synthesis of hydrogen peroxide by hydrogen-oxygen direct method: The microchannel reactor substrate and cover slip coated with Pt-Ni / ZIF-8 hybrid membrane were assembled by thermal bonding method; the liquid inlet was kept at a flow rate of 0.1mL / h Add methanol solvent, feed high-purity hydrogen into the hydrogen inlet at 50mL / h, and feed high-purity oxygen into the oxygen inlet at 50mL / h. The gas and liquid pass through the mixing zone and then flow through the catalytic bed area for reaction. The reaction temperature is 40°C. The reaction pressure was 0.1 MPa, and after 5 hours of stable reaction, the yield of hydrogen peroxide was 89%.

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Abstract

The invention relates to a hydrogen peroxide synthesizing device and method, belonging to the technical field of hydrogen peroxide. According to the device and the method, the following problems in the prior art are solved: (1) by mixing hydrogen and oxygen raw materials, the explosion range is relatively wide, and the danger coefficient is high; (2) hydrogen and oxygen are relatively small in solubility in a reaction medium, and then the reaction efficiency cannot meet the industrial production requirement; and (3) side reactions for directly generating water through hydrogen and oxygen in the reaction process and decomposing hydrogen peroxide occur, and the product selectivity is low. A microchannel reactor comprises a feeding region, a mixing region and a reaction region, wherein the reaction region is coated with a sandwich-structure metal nanoparticle-metal organic skeleton hybrid membrane. The hydrogen peroxide synthesizing method comprises the steps of introducing H2, CO2 and areaction solvent, mixing H2, CO2 and the reaction solvent, and producing H2O2. According to the device and the method, the safe, high-quality and high-efficiency production of hydrogen peroxide is realized.

Description

technical field [0001] The invention relates to the technical field of hydrogen peroxide, in particular to a hydrogen peroxide synthesis device and method. Background technique [0002] Hydrogen peroxide only produces oxygen and water during use. It is an environmentally friendly chemical product and can be widely used in chemical, textile, paper, food, environmental protection and other industries. [0003] At present, the large-scale industrial production of hydrogen peroxide mostly adopts the anthraquinone method. This method has mature technology and high safety factor, but there are problems such as complicated process flow, high equipment investment and serious environmental pollution. In recent years, novel hydrogen peroxide synthesis methods mainly include hydrogen-oxygen direct synthesis method, fuel cell method, plasma method and supercritical carbon dioxide method, etc. The method of directly synthesizing hydrogen peroxide from hydrogen and oxygen is based on an ...

Claims

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Application Information

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IPC IPC(8): B01J19/00B01J31/28B01J35/06C01B15/029
CPCB01J19/0053B01J19/0093C01B15/029B01J31/28B01J2219/00783B01J2219/0086B01J2219/00835B01J35/59
Inventor 李晓丹李建冬崔广志王俞凯梁迎彬
Owner BEIJING MECHANICAL EQUIP INST
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