Preparation method for porous alumina dealcoholizing agent

Abstract

The invention discloses a preparation method for a porous alumina dealcoholizing agent. The porous alumina dealcoholizing agent prepared by using the preparation method provided by the invention can generally reach a specific surface area of 400 m2 / g or above, has a pore volume of larger than 0.5 cm3 / g, and has a pore channel which is a slit type mesopore with a length of 5 to 13 nm. According tothe invention, the porous alumina dealcoholizing agent can adapt to different process conditions through an adsorption reaction, especially has high penetrable adsorption capacity which is generally 8% or above at normal temperature and atmospheric pressure, can reach a saturated adsorption capacity of 25% or above, has high removal accuracy, can directly remove alcohol to a volume of 0.1 ppm or below, has a regeneration temperature of 100 to 300 DEG C, has rapid regeneration speed and rapid reaction rate, can bear large space velocity range, is free of toxicity, side reactions and byproducts,is not obviously decreased in use performance after a plurality times of adsorption-regeneration cycles, has good circulation stability, is free of corrosion to equipment, and is pollution-free to the environment.

Description

technical field [0001] The invention relates to the technical fields of environmental protection and chemical industry, in particular to a preparation method of a porous alumina dealcoholization agent. Background technique [0002] Ethylene and propylene are the most important basic organic chemical raw materials, and the ethylene industry is a symbol to measure the level of a country's industrial petrochemical industry. In recent years, my country's ethylene and propylene industries have developed rapidly. However, due to my country's special energy structure of "rich in coal, short of oil, and low in gas", the production capacity of ethylene and propylene cannot meet the demand for a long time. Space. The production steps of producing low-carbon hydrocarbons from coal through methanol mainly include four steps: coal-to-synthesis gas, synthesis gas purification, gas-to-methanol, and methanol-to-olefins. The produced low-carbon hydrocarbons are separated and purified to obt...

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Problems solved by technology

Patent document: CN105289477 A discloses an adsorbent for removing impurities in olefin streams in coal chemical industry and its application. Zeolite molecular sieves, mesoporous materials, and metal components are mixed and formed according to a certain ratio, and then added to the metal or metal oxide solution Impregnated to obtain an adsorbent; and patent literature: CN101885656 A discloses a method for adsorbing and purifying hydrocarbon streams, patent literature: CN104148006A discloses an adsorbent for removing polar molecules in light hydrocarbon streams and its preparation, Regeneration method: the above four adsorbents all use the impregnation method to load the active components. The direct impregnation method can easily lead to the problem of pore blockage, which will greatly reduce the decarbonization activity and the utilization rate of the catalyst. And because the loading capacity cannot be controlled, This will lead to problems such as difficult regeneration and decreased reaction rate that cannot be ignored.

[0005] Patent document CN104383874A discloses a purification adsorbent based on mesoporous molecular sieve material and its preparation method and application. In this method, mesoporous molecular sieve and activated alumina are mixed mechanically according to a certain ratio, granulated, and roasted to obtain a carrier. The method of leaching loads metal components, and then obtains an adsorbent through drying and activation, which can adsorb impurity gases such as carbon dioxide, water, oxygen, alcohol, ether and the like contained in ethylene, propylene, butene and other streams; patent document CN103495378A discloses A kind of olefin purifying adsorbent and its method for olefin purifying process are disclosed. In the method, 35-50% of kaolin, 20-30% of binder, and 30-40% of submicron molecular sieves are mechanically mixed, and then placed in a rolling Sodium salt solution is sprayed into the ball machine to granulate, and the adsorbent is obtained after drying and roasting, which mainly absorbs methanol, dimethyl ether, propionaldehyde and other impurities in olefins; the above two adsorbents use molecular sieve as the main carrier component, The active component is loaded by spraying. This method ignores that the active component is easily loaded by spraying or spraying, which can easily lead to uneven active components, or even stay on the surface, and cannot penetrate deep into the interior of the carrier. The problem of small capacity caused by the low content of active components

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