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Method for preparing calcium ion selective molecular sieve and application of molecular sieve in descaling

A selective, calcium ion technology, applied in chemical instruments and methods, ion exchange water/sewage treatment, other chemical processes, etc., to achieve the effect of increasing ion exchange rate, efficient removal, and reducing diffusion resistance

Active Publication Date: 2014-07-23
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiency of existing calcium ion adsorption molecular sieves to calcium ion adsorption, provide a calcium ion selective molecular sieve with fast calcium ion exchange rate and large exchange capacity and apply it to geothermal water descaling, seawater Desalination and brine decalcification process

Method used

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  • Method for preparing calcium ion selective molecular sieve and application of molecular sieve in descaling
  • Method for preparing calcium ion selective molecular sieve and application of molecular sieve in descaling
  • Method for preparing calcium ion selective molecular sieve and application of molecular sieve in descaling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) First, take 0.1 mol of NaOH in a beaker, add 99ml of deionized water and stir to dissolve, configure NaOH solution, divide into two parts of about 40ml and 59ml for use;

[0029](2) Take Na 2 SiO 3 9H 2 Add O0.05mol into a beaker containing 40ml NaOH solution, stir in a water bath at 50°C to form a sol; take NaAlO 2 Add 0.1mol to a beaker containing 59ml of NaOH solution, stir well with a glass rod to dissolve it;

[0030] (3) Take 0.02mol of cetyltrimethylammonium bromide (CTAB), add 30ml of sodium hydroxide solution with a concentration of 3.33mol / L, dissolve at 60°C, and stir for 1h;

[0031] (4) At room temperature, quickly add the above sodium silicate solution into the sodium aluminate solution, stir fully for 10 minutes, and form a milky white sol, and each component is composed of: 3Na 2 O: Al 2 o 3 :SiO2 2 :118.7H 2 O, then moved into a PTFE jar, sealed and placed in a water bath at 90°C for static crystallization for 1 hour;

[0032] (5) After tak...

Embodiment 2

[0037] (1) First, take 0.1 mol of NaOH in a beaker, add 100ml of deionized water and stir to dissolve, configure NaOH solution, divide into two parts of about 35ml and 65ml for use;

[0038] (2) Take 0.05mol SiO 2 Add water glass (modulus 2) into a beaker filled with 35ml NaOH solution, stir in a water bath at 50°C to form a sol; take NaAlO 2 Add 0.1mol to a beaker containing 65ml of NaOH solution, stir well with a glass rod to dissolve it;

[0039] (3) Take 0.025mol of cetyltrimethylammonium bromide (CTAB), add 36ml of sodium hydroxide solution with a concentration of 2.78mol / L, dissolve at 65°C, and stir for 2 hours;

[0040] (4) At room temperature, quickly add the above sodium silicate solution into the sodium aluminate solution, stir thoroughly for 5 minutes to form a milky white sol, and each component is composed of: 3Na 2 O: Al 2 o 3 :SiO2 2 :120H 2 O, then moved into a PTFE jar, sealed and placed in a water bath at 90°C for static crystallization for 1 hour;

...

Embodiment 3

[0046] (1) First, take 0.2 mol of NaOH in a beaker, add 100ml of deionized water and stir to dissolve it, configure it into a NaOH solution, divide it into two parts of about 35ml and 65ml for use;

[0047] (2) Take Na containing 0.05mol 2 SiO 3 9H 2 Add O into a beaker containing 35ml of NaOH solution, stir in a water bath at 40°C to form a sol; take Al(OH) 3 Add 0.1mol to a beaker containing 65ml of NaOH solution, stir well with a glass rod to dissolve it;

[0048] (3) Take 0.02mol of cetyltrimethylammonium bromide (CTAB), add 30ml of deionized water, dissolve at 60°C, and stir for 2h;

[0049] (4) At room temperature, quickly add the above sodium silicate solution into the sodium aluminate solution, stir fully for 10 minutes, and form a milky white sol, and each component is composed of: 3Na 2 O: Al 2 o 3 :SiO2 2 :124H 2 O, then moved into a PTFE jar, sealed and placed in a water bath at 60°C for static crystallization for 2 hours;

[0050] (5) After taking it out,...

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Abstract

The invention provides a method for preparing a calcium ion selective molecular sieve and an application of the molecular sieve in descaling. The molecular sieve is prepared by a two-step continuous hydrothermal crystallization method, which comprises the steps of firstly reacting a silicon source and an aluminum source under the action of sodium hydroxide solution to form an aluminosilicate sol, carrying out hydrothermal crystallization for 0.5-1 hour under a sealed condition at 60-90 DEG C, then adding fatty alkyl amines as a structure-directing agent, adjusting the pH value of the solution to 8-13, then carrying out hydrothermal crystallization at 130-150 DEG C for 24-72 hours, filtering, washing and roasting at high temperature to obtain the molecular sieve. The molecular sieve prepared by the method contains cubic crystal particles as well as a plurality of flaky and needle-like crystals and has a higher calcium ion adsorption capacity and adsorption rate which is 2.86 times of the adsorption rate of the traditional 4A molecular sieve. The molecular sieves prepared by the method provided by the invention is used for the field of the descaling of geothermal water, can effectively prevent heat transfer equipment from scaling and can be used as an effective measures to geothermal water pretreatment descaling in a geothermal water descaling system.

Description

technical field [0001] The invention relates to a method for preparing molecular sieves, belonging to the field of molecular sieve preparation and modification. Specifically, it is a preparation method of a calcium ion selective adsorption molecular sieve (or called modified A-type molecular sieve) and the application of the molecular sieve in descaling of geothermal water, desalination of seawater and decalcification of brine. Background technique [0002] Scaling of process equipment (such as heat exchangers) and pipe fittings caused by geothermal water in the process of geothermal energy utilization (such as dry hot rock, oilfield geothermal water, general geothermal water, etc.) is a bottleneck restricting the efficient utilization of geothermal energy One: The solution to the fouling problem of geothermal utilization equipment and pipe fittings has very important theoretical and practical significance for improving the heat exchange efficiency and service life of equipm...

Claims

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Application Information

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IPC IPC(8): C01B39/16B01J20/18C02F1/42C02F103/08
Inventor 刘明言宋军超张洋
Owner TIANJIN UNIV
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