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Preparation method of improved 3A molecular sieve raw powder

A molecular sieve, an improved technology, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as inability to meet deep drying, inability to achieve adsorption and separation performance, shorten production time, improve ion exchange rate, and reduce dosage. Effect

Pending Publication Date: 2020-05-12
润和科华催化剂上海有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN 106365176 A, the exchange rate of 3A molecular sieve raw powder is ≤59%, and the relative water adsorption value is ≤24.75%, which cannot meet the higher requirements of deep drying in the industry
Other methods, such as potassium hydroxide replacing part of sodium hydroxide to provide alkalinity in the crystallization process, adding potassium-containing substances for solid phase exchange in the molding process, etc., cannot achieve high adsorption and separation performance

Method used

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  • Preparation method of improved 3A molecular sieve raw powder
  • Preparation method of improved 3A molecular sieve raw powder

Examples

Experimental program
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Effect test

Embodiment 1

[0020] like figure 1 As shown, add 23m to the exchange tank 3 For the potassium-containing exchange solution, add 4A molecular sieve dry basis 3300Kg, heat up to 85°C with steam, add chemical water to control the solid content of the pre-exchange slurry to 125g / L. Constant temperature reaction for 3 hours. The pre-exchange slurry is sent to a vacuum belt filter, and the dry weight of molecular sieves is 500Kg / h. The mass ratio of the fourth-stage potassium-containing exchange liquid of the vacuum belt filter to the dry base of 4A molecular sieve is 0.33:1. The fourth-stage filtrate is pumped to the third stage of the filter for exchange, and the third-stage filtrate is pumped to The second level performs the exchange. Add 70°C chemical water to wash the molecular sieve in the sixth stage of the vacuum belt filter, and pump the filtrate from the sixth stage to the fifth stage to wash the molecular sieve

Embodiment 2

[0022] Add 22m to the exchange tank 3 For potassium-containing exchange solution, add 4A molecular sieve dry basis 3157Kg, heat up to 90°C with steam, add chemical water to control the solid content of the pre-exchange slurry to 120g / L. Constant temperature reaction for 3 hours. The pre-exchange slurry is sent to a vacuum belt filter, and the dry weight of molecular sieves is 590Kg / h. The mass ratio of the fourth potassium-containing exchange liquid of the vacuum belt filter to the dry base of 4A molecular sieve is 0.35:1. The fourth-stage filtrate is pumped to the third stage of the filter for exchange, and the third-stage filtrate is pumped to the first Secondary exchanges. Add chemical water at 80°C to the sixth stage of the vacuum belt filter to wash the molecular sieve, and pump the filtrate from the sixth stage to the fifth stage to wash the molecular sieve.

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Abstract

The invention discloses a preparation method of improved 3A molecular sieve raw powder. The preparation method comprises the following steps: subjecting potassium-containing exchange liquid recoveredby countercurrent exchange of a vacuum belt filter and a 4A molecular sieve to mixing and stirring in a pre-exchange tank for exchange, and pumping the potassium-containing exchange liquid and the 4Amolecular sieve to the vacuum belt filter for tertiary countercurrent exchange and secondary countercurrent washing after exchange is completed; and carrying out flash evaporation and drying to obtainthe improved 3A molecular sieve raw powder. The improved 3A molecular sieve raw powder prepared by the method is high in ion exchange rate and has better water adsorbability.

Description

technical field [0001] The invention relates to a method for preparing a molecular sieve, in particular to a method for preparing an improved 3A molecular sieve raw powder. Background technique [0002] Molecular sieve is a synthetic hydrated aluminosilicate (zeolite) or natural zeolite with the function of screening molecules. Its general chemical formula is (M'2M)O·Al2O3·xSiO2·yH2O, M' and M are monovalent and divalent cations such as K+, Na+, Ca2+, Ba2+, etc. It has many pores with uniform apertures and well-arranged holes in its structure. Molecular sieves with different apertures separate molecules of different sizes and shapes. According to the different molecular ratios of SiO2 and Al2O3, molecular sieves with different pore sizes can be obtained. Its models are: 3A (potassium A type), 4A (sodium A type), 5A (calcium A type), 10X (calcium X type), 13X (sodium X type), Y (sodium Y type), sodium mordenite type Wait. It has high adsorption capacity, strong selectivit...

Claims

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Application Information

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IPC IPC(8): B01J20/18B01J20/30
CPCB01J20/18
Inventor 王玉乐卓润生黎东王洪飞温恒忠王正奇
Owner 润和科华催化剂上海有限公司
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