Technological process and special apparatus for preparing 4A zeolite

A zeolite and process technology, applied in the field of 4A zeolite synthesis, to achieve the effect of narrow particle size distribution, perfect crystal shape and small device

Inactive Publication Date: 2005-08-10
CHINA RES INST OF DAILY CHEM IND
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The continuous production of the entire process from raw materials to final products has not been reported

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  • Technological process and special apparatus for preparing 4A zeolite
  • Technological process and special apparatus for preparing 4A zeolite

Examples

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Effect test

Embodiment 1

[0019] Sodium silicate solution (Na 2 O: 45g / l; SiO 2 : 120g / l), sodium aluminate is dissolved in NaOH solution to configure sodium aluminate solution (Na 2 O: 90g / l; Al 2 o 3 : 60g / l). The heating medium enters the heating tube 2 from the heating medium inlet 5, flows out from the heating medium outlet 6, and heats up to 75°C. The above two solutions are continuously entered into the mixing reactor through the pipeline to carry out the mixing reaction gelling according to the molar ratio of silicon to aluminum being 2, and then enter the material pipe 1 of the continuous sleeve type crystallizer from the material inlet 3 at a flow rate of 0.5m / min, Stay in material pipe 1 for 30 minutes. After crystallization, it flows out from the material outlet 4, and the mother liquor is removed by a continuous filter washing device, and the pH value is washed with deionized water to 8, and the filtered mother liquor is reused in the preparation of sodium aluminate solution. Finally...

Embodiment 2

[0021] Dissolve sodium silicate in water to form sodium silicate solution (Na 2 O: 75g / l; SiO 2 : 180g / l), alumina colloid is dissolved in NaOH solution to form sodium aluminate solution (Na 2 O: 70g / l; Al 2 o 3 : 40g / l). The heating medium enters the heating tube 2 from the heating medium inlet 5, flows out from the heating medium outlet 6, and heats up to 85°C. Above-mentioned two kinds of solutions are 5 according to the silicon-aluminum molar ratio, respectively enter the mixing reactor continuously through the pipeline and carry out the mixing reaction gelation, then enter the material pipe 1 of the continuous casing type crystallizer from the material inlet 3 with the flow rate 1m / min, in Material pipe 1 stays for 30min. After crystallization, it flows out from the material outlet 4, and the mother liquor is removed by a continuous filter washing device, and the pH value is washed with deionized water to 10, and the filtered mother liquor is reused in the preparatio...

Embodiment 3

[0023] Sodium silicate solution (Na 2 O: 90g / l; SiO 2 : 250g / l), sodium aluminate is dissolved in NaOH solution to configure sodium aluminate solution (Na 2 O: 120g / l; Al 2 o 3 : 40g / l). The heating medium enters the heating tube 2 from the heating medium inlet 5, flows out from the heating medium outlet 6, and heats up to 95°C. The above two solutions are continuously entered into the mixing reactor through the pipeline to carry out the mixing reaction gelation according to the silicon-alumina molar ratio of 6, and then enter the material pipe 1 of the continuous casing type crystallizer from the material inlet 3 at a flow rate of 0.1m / min, Stay in material pipe 1 for 15 minutes. After crystallization, it flows out from the material outlet 4, and the mother liquor is removed by a continuous filter washing device, and the pH value is washed with deionized water to 8, and the filtered mother liquor is reused in the preparation of sodium aluminate solution. Finally, it is ...

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Abstract

The technological process of preparing 4A zeolite includes dissolving sodium silicate as silicon source in water or alkali solution to compound sodium silicate solution; dissolving sodium aluminate as aluminum source in alkali solution to compound sodium aluminate solution; introducing the sodium silicate solution and sodium aluminate solution via pipeline into reactor; crystallizing, filtering, washing and drying. The present invention has the advantages of simple and practical production process, small production apparatus, narrow granularity distribution, prefect crystal form and high crystallization degree of the 4A zeolite product, and continuous production.

Description

Technical field: [0001] The invention belongs to a synthesis method of 4A zeolite, in particular to a synthesis process of 4A zeolite and its special equipment. Background technique: [0002] The synthetic method of 4A zeolite mainly is intermittent reaction under the agitation of stirred tank, adopts synchronous turbulent feeding method and two-stage crystallization process to synthesize 4A zeolite as reported in Chinese Patent 1017160 (Notice No.); After mixed in the crystallization tank, 4A zeolite is synthesized by the process of crystallization; in US Patent 4469036, a two-step process is reported to synthesize 4A zeolite; another two-step process is used to synthesize zeolite Akira Yoshida et al. in Zeolite Magazine 1991, volume 11, 94 The page "Preparation of Zeolite 4A from Water Glass" describes a two-step process for the synthesis of zeolite 4A. The continuous production of the whole process from raw materials to final products has not been reported yet. Inventi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/16
Inventor 杨效益张高勇李秋小
Owner CHINA RES INST OF DAILY CHEM IND
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