Regeneration method of nitrogen-preparation carbon molecular sieve

Abstract

The invention relates to the technical field of molecular sieve, and especially relates to a regeneration method of a nitrogen-preparation carbon molecular sieve. The method provided by the invention sequentially comprises the steps that: screening and washing are carried out, wherein poisoned carbon molecular sieve is screened by using a mesh, and the screened carbon molecular sieve is washed by using water, such that impurities are removed; nitrogen-based high-temperature charring is carried out, wherein the temperature is increased to 850-1000 DEG C under the protection of nitrogen gas, such that charring is carried out; mixed gas activation is carried out, wherein a mixed gas of CO2 and CO is delivered into a furnace cavity, wherein the proportion of CO2 is 85-90%, such that the charred carbon molecular sieve is activated, wherein the temperature in the furnace is 700-800 DEG C; carbon deposition is carried out, wherein activated carbon molecular sieve is placed in a furnace cavity of a converter; the temperature in the converter is 800-900 DEG C; xylene is delivered in under the protection of nitrogen gas; the temperature of the furnace is maintained at 300-500 DEG C, such that xylene is absorbed by the carbon molecular sieve; xylene is cracked under the temperature of 800-900 DEG C, such that pyrolytic carbon is deposited on the char material; the carbon molecular sieve is subjected to pore size adjustment, such that a regenerated finished product is obtained. With the method provided by the invention, deeply poisoned nitrogen-preparation carbon molecular sieve can be activated, and the pore sizes after activation is uniform.

Description

technical field [0001] The invention relates to the technical field of molecular sieves, in particular to a regeneration method for nitrogen-producing carbon molecular sieves. Background technique [0002] Carbon Molecular Sieves (Carbon Molecular Sieves, CMS) is a new type of non-polar adsorbent, which has the ability to adsorb oxygen molecules in the air under normal temperature and pressure changes, so that nitrogen-rich gas can be obtained. The new technology of nitrogen production using carbon molecular sieve pressure swing adsorption method, its most notable feature is nitrogen (N 2 ) The impurity content of the product is low, the nitrogen concentration and gas volume can be adjusted arbitrarily according to needs, and oxygen (O 2 ) high-purity nitrogen with a content of less than 5PPm and a dew point lower than -60°C. [0003] Carbon molecular sieve for nitrogen production has the same microcrystalline structure type as activated carbon and carbon black, and is a k...

AI Technical Summary

Problems solved by technology

[0007] The above two methods are common activation treatment technologies for recovering poisoned carbon molecular sieves in China. These two technologies are only simple activation treatment of carbon molecular sieves. The process is relatively simple, and generally only for shallow-level poisoning such as water and dust. The carbon molecular sieve is effective, and the activation effect of the poisoned deep nitrogen carbon molecular sieve (such as oil pollution, chemical pollution) is relatively poor, and the activated carbon molecular sieve has uneven pore size and more large pores.

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