Purification adsorbent for hydrocarbon impurities, preparing method and application

Abstract

The invention relates to a purification adsorbent for removing impurities in polymerized olefin materials prepared from coal through methyl alcohol. The purification adsorbent for hydrocarbon impurities is prepared from, by weight, 20%-59.5% of molecular sieves, 0.5%-1% of metallic oxide and 40%-64% of activated aluminum oxide, wherein the molecular sieves are composite molecular sieves, and are prepared in the mode that an SAPO molecular sieve or SSZ molecular sieve and one or more of a A-type molecular sieve, X-type molecular sieve and Y-type molecular sieve are mixed. Compared with the prior art, the adsorbent prepared with the method is high in particle mechanical strength, small in dust and low in adsorption heat effect, has the deep adsorption function, and can be used for removing impurities such as water, carbon dioxide, hydrogen sulfide, methyl alcohol, ethyl alcohol, formaldehyde, acetaldehyde, mercaptan and dimethyl ether in the polymerized olefin materials prepared from the coal through the methyl alcohol.

Description

[0001] Technical field: [0002] The invention belongs to the field of purifying adsorbents, and particularly relates to a purifying adsorbent used for removing impurities in olefin materials prepared from coal through methanol. [0003] Background technique: [0004] The production of polyolefins from coal through methanol opens up the second raw material production process route for olefin production. Different from the traditional petroleum cracking process, the impurities in the ethylene and propylene produced are quite different regardless of the type or content. For the ethylene and propylene produced from coal through methanol, it must reach the polymerization level of the petroleum cracking process. Purifying the methanol, ethanol, dimethyl ether and other oxide-containing impurities in ethylene and propylene is the focus of the methanol-to-olefin purification process. The essential. And low-cost purification of olefins has become a hot spot of general concern. [0005] Mole...

AI Technical Summary

Problems solved by technology

It is reported that molecular sieves or alumina are used to purify oxygen-containing impurities such as methanol and dimethyl ether in olefins. Olefins are unsaturated hydrocarbons with strong polarity. The impurities in the above-mentioned olefins are also polar molecules. Molecular sieves are used to adsorb and purify impurities. At the same time, olefins will be adsorbed at the same time, causing the temperature of the adsorption bed to rise, which in turn will cause the polymerization of olefins on the surface of the adsorbent.

When alumina is used as an adsorbent, although the heat of adsorption is low, it has the disadvantages of low adsorption depth and capacity.

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