Preparation method for fluidized bed catalyst

Abstract

The invention discloses a preparation method for a fluidized bed catalyst. The preparation method comprises the following steps: (1) adding reaction liquid into an impinging stream reactor, enabling the reaction liquid to reach the bottom of the impinging stream reactor, heating and starting a stirring paddle at the bottom; (2) respectively injecting an alkali metal aluminate aqueous solution and CO2 gas flow through an acceleration pipe at the upper part of the impinging stream reactor, performing gas-liquid impinging stream reaction on the alkali metal aluminate aqueous solution subjected to atomization and the CO2 gas flow to generate an aluminum hydroxide crystal nucleus entering a settling region; (3) at the end of the gas-liquid impinging stream reaction, simultaneously and continuously adding an acidic aluminum salt aqueous solution and the alkali metal aluminate aqueous solution or an alkaline settling agent from feed inlets II and III, adjusting the pH value, and performing neutral reaction; (4) performing aging, filtering, washing and drying to obtain aluminium oxide dry glue; (5) uniformly mixing the aluminium oxide dry glue, small-hole SB powder and sesbania powder, adding an adhesive to form a plasticizer, performing extrusion and forming, drying and roasting to obtain an aluminum oxide carrier, immersing active metal, drying and roasting to obtain the fluidized bed catalyst. The impinging stream reactor is adopted in the method, so that the transfer characteristic between the gas phase and the liquid phase as well as between one liquid phase and another liquid phase is enhanced, so that the prepared fluidized bed catalyst is high in intensity and low in abrasion; furthermore, the pore volume and the aperture of the catalyst are larger.

Description

technical field [0001] The invention belongs to catalyst preparation technology, in particular to a preparation method of ebullated bed catalyst. Background technique [0002] At present, the fixed bed process is mostly used in the processing of heavy oil, but the fixed bed process has many problems such as raw material mechanical impurities, which are easy to cause pressure drop; catalyst deactivation is fast, the service life is short, and the investment cost is high. The fluidized bed process has become a very good low-quality heavy and residual oil hydrotreating process because of its characteristics of no pressure drop, long production cycle, easy control of reaction temperature, adjustable raw materials, and low system investment. However, the catalyst in the ebullating bed reactor is always in a boiling back-mixing state, so there are higher requirements for the strength and wear performance of the hydrogenation catalyst. [0003] The force of catalyst strength can b...

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Problems solved by technology

However, the pore volume of alumina fibers introduced in this method is small, which has a great influence on the pore structure of the catalyst. Secondly, the cost of alumina fibers is relatively high, thereby increasing the production cost.

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