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High-selective catalyst for dehydrogenating cyclohexanol to produce cyclohexanone and preparation method thereof

A high-selectivity, catalyst technology, applied in the direction of dehydrogenation preparation, carbon-based compound preparation, chemical instruments and methods, etc., can solve the problems of increasing burden, high operating temperature, and affecting the quality of caprolactam products, so as to improve selectivity and reduce The effect of content

Inactive Publication Date: 2017-06-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The cyclohexanol dehydrogenation catalyst used in the industry in the early days was red iron oxide, which was later replaced by zinc-based catalysts. However, due to the high operating temperature of zinc-calcium catalysts, the selectivity of the product cyclohexanone is poor, and the energy consumption is large. Too many products increase the burden of subsequent processes and affect the quality of caprolactam products. Therefore, since the 1970s, there has been an international competition to develop low-temperature high-selectivity catalysts

Method used

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  • High-selective catalyst for dehydrogenating cyclohexanol to produce cyclohexanone and preparation method thereof

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Effect test

Embodiment 1

[0020] Catalyst preparation is carried out in an open reactor, according to the following steps to implement. Take 1000ml solution a of 1.0M copper nitrate solution; in a precipitation tank with stirring, at a precipitation temperature of 50°C, co-precipitate the sodium carbonate solution and 980 grams of silica sol, age for 5 minutes, and then add solution a In the above precipitation, the precipitation temperature is 50°C, the pH value of the end point of the precipitation is 8.4, and the catalyst is aged at 60°C for 60 minutes, washed, dried, crushed, roasted at 420°C, and pressed into tablets to obtain a usable catalyst.

Embodiment 2

[0022] Catalyst preparation is carried out in an open reactor, according to the following steps to implement. Take 100ml of 1.0M copper nitrate solution and 16ml of 1.0M manganese nitrate solution to prepare mixed solution a; in a sedimentation tank with stirring, the precipitation temperature is 50°C, co-precipitate the sodium carbonate solution and 1048 grams of silica sol, Precipitation temperature is 50°C, age for 5 minutes, then add solution a to the above precipitation, control the precipitation temperature at 50°C, the pH value of the end point of precipitation is 8.1, age at 60°C for 60 minutes, wash, dry, Granulating, calcining at 450°C, and pressing into tablets to obtain a usable catalyst.

Embodiment 3

[0024] Catalyst preparation is carried out in an open reactor, according to the following steps to implement. Take 1000ml of 1.0M copper nitrate solution and 12ml of 1.0M cerium nitrate solution to prepare mixed solution a; in a precipitation tank with stirring, at a precipitation temperature of 50°C, co-precipitate potassium carbonate solution and 1048 grams of silica sol , aged for 5 minutes, then added solution a to the above precipitation, controlled the precipitation temperature to 50°C, the pH value of the end point of the precipitation was 7.9, aged at 60°C for 60 minutes, washed, dried, granulated, and 450°C Roasting, tablet molding, that is, a usable catalyst.

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Abstract

The invention belongs to the technical field of production of catalysts, and provides a catalyst for gas-phase-dehydrogenating cyclohexanol to produce cyclohexanone and a preparation method thereof. The catalyst can effectively reduce generation of a side product, cyclohexene. The catalyst is mainly composed of Cu2O / SiO2, wherein an active additive is added to improve acidic sites on the surface of the catalyst. The catalyst is prepared through a stepwise precipitating method, wherein the method includes the steps of washing, solid and liquid separation, drying, roasting and tabletting moulding. The catalyst is high in activity and selectivity, wherein the content of the cyclohexene in a product is 20-80 ppm.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a high-selectivity catalyst for preparing cyclohexanone from cyclohexanol dehydrogenation and a preparation method. Background technique [0002] Cyclohexanone is an important organic chemical raw material. It is the main intermediate in the production of caprolactam (raw material for nylon-6) and adipic acid (raw material for nylon-66). In addition, cyclohexanone is also widely used in organic solvents , synthetic rubber and industrial coatings and other industrial production processes. At present, the production methods of cyclohexanone mainly include cyclohexanol dehydrogenation and cyclohexanol oxidation. The dehydrogenation method is to prepare cyclohexanone by dehydrogenating cyclohexanol under the action of a catalyst, and the oxidation method is to prepare cyclohexanone by passing cyclohexanol and air through a catalyst at 250°C-300°C. The dehydrogenation ...

Claims

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Application Information

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IPC IPC(8): B01J23/656B01J23/72B01J23/78B01J23/83B01J23/889C07C45/00C07C49/403
CPCB01J23/72B01J23/6562B01J23/78B01J23/83B01J23/8892C07C45/002C07C49/403
Inventor 孙中华张皓殷玉圣袁浩然吴结华
Owner CHINA PETROLEUM & CHEM CORP
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