Honeycomb nest hydrogenation protecting agent

Abstract

A honeycomb nest hydrogenation protecting agent is prepared from 1-60% of alumina powder, 5-50% of kaolin, 0.1-15% of talcum powder, 5-60% of clay, 0.5-10% of an alkaline solvent, and 0.1-5% of an auxiliary material. The unit cross section area of the above product has more and denser through holes, so the external specific surface area of the product is greatly increased and reaches above 5000m<2>/m<3>, so a reaction raw material and the protecting agent have a larger contact and reaction area. The void fraction of the product reaches 30-70%, the water absorption rate reaches 10-50%, and the appropriate water absorption rate makes the protecting agent adsorb more active substances, so the absorption rate of adsorbed impurities is improved, and the catalysis effect is improved; and the radial crushing strength of the product is 50-500N/granule of the product, the product cannot be fragmented when 50-500N is applied to the two axial ends of the product, and maintains integrity, so the strength is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to a hydrogenation protecting agent used in fixed-bed hydrogenation reactors in oil refining, petrochemical, chemical and other industries. It specifically relates to a honeycomb bird's nest hydrogenation protection agent (or bird's nest honeycomb ceramic body, bird's nest honeycomb proppant or bird's nest proppant, etc.). Background technique [0002] In oil refining, petrochemical, chemical and other industries, especially in fixed-bed hydrogenation reactors for residual oil, coal tar and other raw materials containing more impurities, the main solid deposits in the raw materials are carbon deposits and metal sulfides. Part of it enters the pores of the catalyst, and the other part deposits on the outer surface of the catalyst particles. After long-term accumulation, the pressure drop of the catalyst bed gradually increases, and finally the reactor is blocked. Therefore, in order to prolong the operation cycle of industrial de...

AI Technical Summary

Problems solved by technology

[0004] At present, there are many kinds of hydrogenation protective agents used in the market, and their shapes include spherical, cylindrical, Raschig ring, impeller ring, honeycomb cylindrical and other specifications, and their shapes, sizes, materials, and activities are different, and their functions and effects are also different. They are different. For the hydrogenation protection agent loaded in the upper layer, its main function is to effectively filter and absorb fine solid impurities in the raw oil and remove highly reactive organometallic impurities such as iron and vanadium; The existing hydrogenation protection agents are not very ideal in this respect. For example, although the most commonly used Raschig rings and impeller rings have large voids, their specific surface areas are small, and the through holes in the middle are too large to trap impurities.

In recent years, bird's nest honeycomb ceramics, which have been gradually popularized and applied in the field of oil refining, have a larger outer void ratio and outer surface area, and their ability to intercept impurities is also significantly higher than that of Raschig rings. However, due to the limitations of the previous raw material formula and manufacturing process, its The density of through-holes can only be less than 900 meshes (cpsi, that is, the number of through-holes per square inch, through-hole density or can also be understood as hole density, that is, the number of channels per square inch of cross-section), resulting in a reaction medium The specific surface area of ​​the contact is small, and the removal efficiency is low; and the aspect ratio (the ratio of product height to diameter) is generally greater than 1 / 4, so that the center of gravity will be unstable and inclined after the hydrogenation protective agent is filled, making the radial through hole Inconsistent with the direction of impurities and airflow flowing in the hydrogenation reactor, the efficiency of capturing impurities is reduced, which seriously affects the use effect of the hydrogenation protective agent

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