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A zeolite molecular sieve adsorbent for separating p-cresol and m-cresol isomers and a preparing method thereof

A zeolite molecular sieve and adsorbent technology, applied in the field of separating para- and meta-cresol isomer zeolite molecular sieve adsorbent and its preparation, can solve the problem of low polar selectivity separation coefficient of cresol isomer and complicated equipment investment and other problems, to achieve the effect of small equipment investment and simple process

Active Publication Date: 2017-07-14
SHANGHAI FUYU NEW MATERIAL TECH +2
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Problems solved by technology

The adsorbent using the above-mentioned large-pore zeolite molecular sieve must adopt a simulated mobile device with a high-plate multi-stage separation effect due to the relatively low polar selectivity separation coefficient of meta-position and para-cresol isomers (usually lower than 5). Bed technology can achieve effective separation, complex equipment and high investment

Method used

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  • A zeolite molecular sieve adsorbent for separating p-cresol and m-cresol isomers and a preparing method thereof

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Embodiment Construction

[0014] 1. Preparation of zeolite molecular sieve adsorbent.

[0015] Ion exchange treatment is to use commercially available zeolite molecular sieve powders of various structural types, and use common well-known techniques, that is, to use 1 mole / liter of ammonium chloride, or sodium chloride, or potassium chloride solution to liquid / The solid ratio is 10 / 1, the temperature is 90 ℃, stirred for 1 hour, and then filtered and washed. After this process is repeated 3 times, the product is dried at 100-120 ℃ to obtain various structural types of ammonium, sodium and potassium. Zeolite molecular sieve powder.

[0016] The forming and sieving of the adsorbent, using silica sol as the binder to form various structural types of ammonium, sodium, and potassium zeolite molecular sieve powders into granules, and slightly crush them, and use a sample sieve to sieve 20 -40 mesh particles, obtained various structural types of ammonium, sodium and potassium zeolite molecular sieve adsorbents, u...

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Abstract

The invention belongs to the technical field of zeolite molecular sieves, and particularly relates to a zeolite molecular sieve adsorbent for separating p-cresol and m-cresol isomers and a preparing method thereof. According to the zeolite molecular sieve adopted as the adsorbent, the opening aperture width of a main pore passage is 0.50-0.55 nm, the crystal framework density is 15.5-20.1 T / nm<3>, the mole ratio of silica to alumina in a crystal framework structure is 4 to all silicon, and structure type codes are EUO, FER, ITH, LAU, MEL, MFI, MFS, MTT, MWW, STI, STT, SZR, BRE, EAB, ERI, ITW, TUN, MER and RWR. When the adsorbent is used for adsorption separation of a gaseous mixture of p-cresol and m-cresol, the adsorption selectivity of the p-cresol relative to all cresol is 82.1-100%, and the highest adsorption amount of the p-cresol on the adsorbent can be 250.5 mg / g. Accordingly, adsorption separation of the p-cresol and the m-cresol can be achieved by an vapor-phase fixed bed adsorption separation process.

Description

Technical field [0001] The invention belongs to the technical field of zeolite molecular sieves, and specifically relates to a zeolite molecular sieve adsorbent for separating para- and meta-cresol isomers and a preparation method thereof. Background technique [0002] The three cresol isomers of p-cresol, m-cresol and o-cresol are mainly derived from by-products of coking, oil shale retorting, city gas and chemical synthesis. As an important raw material, p-cresol can be used in industrial sectors such as pesticides, dyes, plastics and medicines. At the same time, it also has important applications in synthetic resins, color film developers, and adhesives. The o-cresol in the cresol isomer mixture can be obtained by traditional distillation. The boiling points of p-cresol and m-cresol are 201.9℃ and 202.8℃ respectively. Distillation separation is extremely difficult, but it can be separated by adsorption separation method. [0003] The adsorption separation method usually uses ze...

Claims

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Application Information

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IPC IPC(8): B01J20/18B01J20/30
CPCB01J20/186
Inventor 龙英才魏小波郭娟
Owner SHANGHAI FUYU NEW MATERIAL TECH
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