Preparation method of large-pore-volume and high-strength aluminum oxide of catalyst for preparing ethylene from ethanol

Abstract

The invention discloses a preparation method of large-pore-volume and high-strength aluminum oxide of a catalyst for preparing ethylene from ethanol. The preparation method is characterized by comprising the following steps: (1) drying and crushing aluminum hydroxide trihydrate, and carrying out flash evaporation on aluminum hydroxide trihydrate for rapid dehydration; (2) adequately mixing raw powder and a pore-enlarging agent in a mixing machine so as to obtain a mixed material; (3) adding the mixed material into a kneading machine, and kneading; (4) adding the kneaded material into a strip extruder, and extruding the kneaded material to obtain a strip material; (5) adding the cut strip material into a drying room, and carrying out forced curing; (6) adding the cured strip material into an activating oven, and roasting the strip material; (7) washing the roasted strip material in a washing tank; and (8) adding the washed strip material into the activating oven, and roasting the strip material again. The preparation method has the beneficial effects that by improving the process flow and selecting the pore-enlarging agent, the physical and chemical properties of the catalyst for preparing ethylene from ethanol are greatly improved, and the conversion rate and selectivity of process for preparing ethylene from ethanol are increased; the catalyst can resist the repeated scouring of a fluidized bed, so that the service life of the catalyst is greatly prolonged.

Description

Technical field [0001] The invention relates to the field of fine chemical synthesis, in particular to a method for preparing large-pore volume and high-strength alumina for ethanol-to-ethylene catalyst. Background technique [0002] Ethylene is one of the most important chemical raw materials in the petrochemical industry. The ethylene, propylene, butadiene, benzene, toluene, xylene, etc. produced in the ethylene plant are used to produce various organic chemical raw materials and synthetic resins, synthetic fibers, and synthetic rubbers. The basic raw materials of three synthetic materials. The current problems of ethanol production of ethylene are: high reaction temperature, low ethanol conversion rate and ethylene selectivity, and short catalyst life. To solve the above problems, we must start with the optimization of the catalyst and the transformation of the reactor. Therefore, improving the physical and chemical performance of the catalyst and the use of fluidized bed are...

AI Technical Summary

Problems solved by technology

At present, the problems of producing ethylene by ethanol method are: high reaction temperature, low ethanol conversion rate and ethylene selectivity, and short catalyst life, etc.

[0005] At present, the catalyst for industrial ethanol to ethylene is still mainly activated alumina, but this catalyst has high reaction temperature and high energy consumption.

Although some other catalysts have high catalysis and selectivity, due to the limitations of various conditions, they have not been popularized in industrialization.

Molecular sieve catalysts have attracted the attention of researchers because of their non-corrosive equipment, high conversion rate, and good thermal stability. However, they are prone to carbon deposition, deactivation, and short lifespan.

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