Ion exchange method for solid substance containing exchangeable ions

A solid material and ion exchange technology, applied in the field of ion exchange, can solve the problems of high cost, excessive ammonium nitrogen, high energy consumption, etc., achieve the effect of reducing usage, realizing zero discharge, and improving economic benefits

Active Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of chemical equilibrium, NH 4 + It is impossible to completely replace Na at one time + , in order to get Na 2 For molecular sieves with low O content, the ammonium exchange process needs to be repeated many times, resulting in a large amount of wastewater with excess ammonium nitrogen
In order to meet the national discharge standard of ammonium nitrogen less than 15mg / L, the wastewater needs to be treated, but the energy consumption and cost of wastewater treatment are high

Method used

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  • Ion exchange method for solid substance containing exchangeable ions
  • Ion exchange method for solid substance containing exchangeable ions
  • Ion exchange method for solid substance containing exchangeable ions

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Embodiment approach

[0039] According to a second embodiment of the present invention, the electrodialyzer comprises counter electrodes and at least two bipolar membranes and at least one anion exchange membrane located between the counter electrodes, the bipolar membranes and anion exchange membranes alternate Arranged, the second acid chamber is between the cation exchange layer of the bipolar membrane and the anion exchange membrane, and the second alkali chamber is between the anion exchange layer of the bipolar membrane and the anion exchange membrane.

[0040] For ease of description, the present invention refers to the acid chamber between the cation exchange layer and the anion exchange membrane of the bipolar membrane as the second acid chamber, and the alkali chamber between the anion exchange layer and the anion exchange membrane of the bipolar membrane as the second acid chamber. Two alkali room.

[0041] In this second embodiment, the exchangeable ions contained in the solid material ...

Embodiment 1

[0069] This example is used to illustrate the method for ion-exchanging solid substances of the present invention.

[0070] The bipolar membrane electrodialyzer used in this embodiment contains a bipolar membrane and a cation exchange membrane, and the number of the first acid chamber and the first alkali chamber is 20 pairs, and a plurality of the first acid chambers are connected in parallel.

[0071] Weigh the NaY molecular sieve (NaY) of 500g 2 The O content is 13.0% by weight, and the relative crystallinity is 85%) and 5000 g of deionized water are evenly stirred to obtain a molecular sieve slurry. The slurry of the molecular sieve is added in the first acid chamber storage tank of the bipolar membrane electrodialyzer, and 2000g deionized water is added in the first alkali chamber storage tank of the bipolar membrane electrodialyzer, and the electrode chamber is added 5 wt% Na 2 SO 4 Aqueous solution 2000ml. Turn on the circulation pump power supply of the electrodial...

Embodiment 2

[0073] This example is used to illustrate the method for ion-exchanging solid substances of the present invention.

[0074] The bipolar membrane electrodialyzer used in this embodiment contains a bipolar membrane and a cation exchange membrane, and the number of the first acid chamber and the first alkali chamber is 20 pairs, and a plurality of the first acid chambers are connected in series.

[0075] Take by weighing 200g one baked REY molecular sieve (Na 2 The O content is 4.6% by weight, and the relative crystallinity is 51%) and 4000 g of deionized water are evenly stirred to obtain a molecular sieve slurry. The slurry of this molecular sieve is added in the first acid chamber storage tank of bipolar membrane electrodialyzer, and in the first alkaline chamber storage tank of this bipolar membrane electrodialyzer, add 2000g deionized water, in the electrode chamber storage tank Add 20 wt% Na 2 SO 4 Aqueous solution 2000ml. Turn on the circulation pump power supply of th...

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Abstract

The invention provides an ion exchange method for a solid substance containing exchangeable ions. The method comprises the following step of carrying out bipolar membrane electrodialysis to the slurry of the solid substance containing the exchangeable ions so as to exchange ions. The method can dissociate the water characteristics by utilizing a bipolar membrane electronic dialyzator without additionally adding other ions for exchange. According to the ion exchange method for the solid substance in the invention, ions are exchanged at a higher speed so as to rapidly carry out ion exchange to the solid substance with high efficiency. The method for the electrodialysis of the solid substance in the invention can obtain acid liquor and/or alkali liquor with higher purity level while carrying out ion exchange to the solid substance containing the exchangeable ions to realize the zero emission of wastewater and improve the economic benefits of the method.

Description

technical field [0001] The invention relates to a method for ion exchange of solid matter, in particular to a method for ion exchange of solid matter by bipolar membrane electrodialysis. Background technique [0002] According to the data of the Ministry of Water Resources in 2005, 78% of the river sections flowing through cities in the country are no longer suitable for drinking water sources, and 50% of the urban groundwater is polluted. Water pollution will not only directly affect industrial and agricultural production, but also cause serious harm to human health. In order to achieve the sustainable development of the country and the harmonious coexistence between man and nature, the country has formulated the national standard GB8978-1996 for industrial sewage discharge, which stipulates that the primary discharge standard of ammonium nitrogen in the petrochemical industry is 15mg / L, and the secondary discharge standard is 50mg / L. [0003] The process of petrochemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/44
Inventor 刘中清舒兴田罗一斌
Owner CHINA PETROLEUM & CHEM CORP
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