Fixed bed catalyst preparation method and fixed bed catalyst

Abstract

The invention discloses a fixed bed catalyst preparation method and a fixed bed catalyst. The method comprises that a molded carrier contacts a metal compound solution in an impregnation machine, and the molded carrier after contacting is dried and calcined, wherein the impregnation machine comprises an obliquely-arranged roller (10), the roller (10) comprises a rotatable cylinder (1) and a spray device (2), the inner wall of the cylinder (1) is provided with a spiral blade, and the spray device (2) is fixedly arranged and extends into the internal space of the cylinder (1). According to the method, a molded carrier is conveyed into the cylinder (1), and a metal compound solution is sprayed on the molded carrier with the spray device (2). With the method, the fixed bed catalyst with characteristics of good impregnation uniformity and low impregnation breaking rate can be obtained, automatic catalyst impregnation control can be achieved, production cost can be reduced, and requirements of large-scale industrial production can be met.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for a fixed bed and a catalyst for a fixed bed prepared by the method. Background technique [0002] Due to the rapid expansion of the scale of refinery hydrogenation units, the domestic demand for hydrogenation catalysts continues to grow rapidly. On the one hand, it is necessary to expand the production capacity of hydrogenation catalysts, and on the other hand, it is necessary to provide better quality hydrogenation catalyst products to meet the market demand for environmentally friendly energy. [0003] The impregnation method is the most common method for producing hydrogenation catalysts. By contacting the catalyst carrier with the impregnating liquid, a certain amount of active components enter into the micropores of the catalyst carrier. The active component penetrates and diffuses to the inner wall of the pore channel, and then undergoes adsorption, deposition or ion exchange with t...

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Problems solved by technology

[0009] To sum up, the currently applied hydrogenation catalyst impregnation technology has the following disadvantages: the first production capacity is low

The single batch production capacity of the existing impregnation equipment is between 100-300kg, which is far from meeting the needs of large-scale production of hydrogenation catalysts

If simple capacity expansion is carried out on the basis of the existing impregnation equipment, the quality of the catalyst product will decline, and the impregnation breakage rate of the carrier will be high, which will increase the production cost of the catalyst

Uneven second impregnation

However, due to the relative position of the two ends of the drum, the contact between the carrier and the impregnating liquid is less, resulting in uneven distribution of the impregnated metal.

The third dipping breakage rate is high

At present, the catalyst breakage rate of the impregnation equipment in the prior art is about 2%, the main reason is that the heat dissipation effect is poor during impregnation, and the collision between the carrier and the drum is serious

The fourth cooling effect is poor

At present, the thickness of the material layer in the middle part of the impregnation equipment in the prior art is between 500-800mm, the effect of stirring the material during impregnation is poor, and the adsorption heat is difficult to discharge in time, resulting in high impregnation temperature and affecting the strength of the catalyst

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