A kind of preparation method of fluidized bed catalyst

Abstract

The invention discloses a preparation method of an ebullated bed catalyst. The method includes the following contents: (1) adding the reaction solution at the bottom of the impinging flow reactor and heating it, and starting the stirring paddle at the bottom; (2) injecting the alkali metal aluminate aqueous solution and the CO2 gas flow through the acceleration tube on the upper part of the impinging flow reactor respectively , after the alkali metal aluminate aqueous solution is atomized, it undergoes a gas-liquid impact flow reaction with the CO2 gas flow to generate aluminum hydroxide crystal nuclei and enters the sedimentation zone; III At the same time, add acidic aluminum salt aqueous solution and alkali metal aluminate aqueous solution or alkaline precipitant continuously to adjust the pH value and neutralize the reaction; (4) aging, filtering, washing and drying to obtain alumina dry glue; (5) adding Alumina dry glue, small-hole SB powder and safflower powder are mixed evenly, then an adhesive is added to form a plastic body, extruded into a strip, dried and roasted to obtain an alumina carrier, impregnated with active metals, dried and roasted to obtain a fluidized bed catalyst. In the method of the invention, an impingement flow reactor is adopted to strengthen the transfer characteristics between the gas-liquid two-phase and the liquid-liquid two-phase, and the prepared ebullated bed catalyst has high strength and low wear, and the pore volume and pore diameter of the catalyst are relatively large.

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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