A kind of ion exchange method

Abstract

The invention provides an ion exchange method. According to the method, a slurry comprising a solid substance with exchangeable groups flows through an ion exchange column filled with an ion exchange resin bed layer, such that the exchangeable groups in the solid substance is subjected to ion exchange with ion exchange groups in the ion exchange resin in the ion exchange resin bed layer; and solid-substance-containing slurry flowing out from the ion exchange column is collected. At least part of the ion exchange resin is magnetic ion exchange resin. Also, when the slurry flows through the ion exchange column, the ion exchange column is positioned in a transversal rotation magnetic field. With the method provided by the invention, after ion exchange, no or substantially no molecular sieve is adhered to the surface of the ion exchange resin, such that ion exchange column service period can be effectively prolonged, and washing and regeneration frequencies can be reduced. Under a same condition of ion exchange, with the method provided by the invention, higher ion exchange efficiency can be achieved.

Description

technical field [0001] The invention relates to an ion exchange method, more specifically, relates to a method for ion exchange of solid substances containing exchangeable groups by using an ion exchange column. Background technique [0002] Molecular sieves are widely used in the field of petrochemical industry. At present, the methods of industrially synthesizing molecular sieves are all in alkaline solution, so the synthesized molecular sieves are all sodium type. The largest catalyst in the oil refining industry is catalytic cracking catalyst, which mostly uses Y-type molecular sieve as the active component. When Y-type molecular sieve is artificially synthesized, it is in the stable NaY form. The sodium ion completely neutralizes the negative charge center in the zeolite molecular sieve, resulting in Sodium molecular sieves do not have acid centers. Therefore, sodium molecular sieves have almost no activity in the carbon ion reaction. If they are used as catalytic crac...

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Problems solved by technology

[0003] The existing molecular sieve desodination method is usually to exchange the sodium ion in the molecular sieve into NH with ammonium salt solution first. 4 + , and then roasted at high temperature, the NH 4 + Convert to H + , of course this process cannot be completed at one time, in order to get Na + Molecular sieve with low content, the ammonium exchange process needs to be repeated many times

This existing exchange method will produce a large amount of industrial wastewater, and among all the acidic ammonium-containing wastewater in the catalyst plant, the highest concentration of ammonia nitrogen is the exchange liquid and initial washing water produced by the molecular sieve ammonium exchange process, and its ammonia nitrogen content is higher than that of other ammonium-containing wastewater. More than several times of waste water (such as secondary washing water, tertiary washing water)

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