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Catalyst grading method for anthraquinone hydrogenation

A catalyst and anthraquinone technology, applied in the field of catalyst grading for anthraquinone hydrogenation, can solve the problems of affecting the performance and life of the catalyst, small pressure drop in the lower tower, easy to accumulate liquid, etc., to solve the reaction rate and liquid accumulation, reduce Industrial production costs, performance and longevity benefits

Active Publication Date: 2018-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem in the prior art of hydrogenation of anthraquinone, the lower tower reaction between the two towers connected in series up and down is small, resulting in a small pressure drop in the lower tower and easy liquid accumulation, thereby affecting the performance and life of the overall catalyst. Provides a gradation method for anthraquinone hydrogenation catalysts, effectively solving the problems of pressure drop and liquid accumulation in the lower tower

Method used

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  • Catalyst grading method for anthraquinone hydrogenation

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Embodiment 1

[0020] Catalyst preparation

[0021] Hydrogenation catalysts with the same composition after industrial application with different operating cycles, with a particle size of 2.0mm, were regenerated by conventional noble metal catalyst regeneration methods, and the numbers were A-1, A-2, and A-3.

[0022] Take an appropriate amount of alumina spherical carrier with a particle size of 2.2~2.8mm, use PdCl 2 The solution was saturated impregnated, then dried at 110°C for 6 hours, and calcined at 500°C for 4 hours in an air atmosphere to obtain catalyst B containing 0.3wt% Pd.

[0023] After evaluation, the activities of the regenerated catalysts A-1, A-2, and A-3 were 78%, 85%, and 92% of those of the new catalyst B, respectively, which did not meet the requirements for completely independent use, and generally require metal recovery treatment.

Embodiment 2

[0026] The upper and lower towers of anthraquinone hydrogenation are filled with catalyst A-1 and catalyst B respectively. Catalyst A-1:catalyst B=1:2 (volume ratio). The raw material is a working fluid with an anthraquinone solubility of 140g / L. The evaluation conditions and The results are shown in Table 1.

Embodiment 3

[0028] The upper and lower towers of anthraquinone hydrogenation are filled with catalyst A-2 and catalyst B respectively. Catalyst A-2:catalyst B=1:1 (volume ratio). The raw material is a working fluid with an anthraquinone solubility of 140g / L. The evaluation conditions and The results are shown in Table 1.

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Abstract

The invention relates to a catalyst grading method for anthraquinone hydrogenation. In the upper tower and lower tower of anthraquinone hydrogenation, the upper tower is filled with a catalyst with low relative activity and small relative particle size, and the lower tower is filled with a catalyst with high relative activity and large relative particle size. The catalyst grading method can be applied to the anthraquinone hydrogenation process of producing hydrogen peroxide by an anthraquinone process. According to the process characteristics of the anthraquinone hydrogenation process, the invention provides the simple and easy catalyst grading method, and the problems of pressure drop and hydrops in the lower tower are solved. During the grading process, a regenerated catalyst be can adopted in the upper tower, and the regenerated catalyst which does not meet the single use standard after the regeneration is adopted, so that the activity of the catalyst is fully exerted. With the overall grading distribution design, the performance and the service life of the catalyst are further improved, and the industrial production cost is reduced.

Description

technical field [0001] The invention relates to a catalyst gradation method for anthraquinone hydrogenation, in particular to an anthraquinone hydrogenation process in the process of producing hydrogen peroxide by an anthraquinone method. Background technique [0002] Hydrogen peroxide is an important chemical product, which is widely used in papermaking, chemical industry, food, environmental protection and other fields. Many valuable chemical products can be prepared from hydrogen peroxide, such as inorganic peroxyacids and their salts, epoxides, organic peroxides, and meaningful chemical reaction intermediates. As a weak oxidizing agent, hydrogen peroxide has much higher selectivity than other oxidizing agents in organic synthesis. Hydrogen peroxide is used as a bleaching agent in the textile industry and papermaking industry, as an oxidizing agent in chemical synthesis, as a disinfectant and bactericide in the food and pharmaceutical industries, and can be used to treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/00C01B15/023
CPCB01J8/008B01J8/0085B01J2208/00805C01B15/023Y02P20/584
Inventor 贾立明徐会青刘全杰李爱婷王伟
Owner CHINA PETROLEUM & CHEM CORP