Preparation method of 5A molecular sieve adsorbent

A molecular sieve and adsorbent technology, which is applied in the field of preparation of 5A molecular sieve adsorbent, can solve the problems of low molecular sieve strength and molecular sieve forming difficulties, and achieve the effects of increasing calcium ion exchange degree, reducing waste water discharge, and improving mass transfer performance

Active Publication Date: 2022-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent CN104549552A mixes 4A molecular sieve and CaO powder evenly, then shapes, dries, roasts, washes with water until the pH value of the washing liquid is less than 10, and then activates at 350-500°C to obtain a 5A molecular sieve adsorbent. Although this method does not use alkali 5A molecular sieve adsorbent without binder can be prepared after treatment, but the molding of molecular sieve is difficult, and the strength of molecular sieve after molding is low

Method used

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  • Preparation method of 5A molecular sieve adsorbent

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Effect test

Embodiment 1

[0025] Mix 85g of NaA molecular sieve raw powder, kaolin with a mass fraction of 9g, 5g of sodium carbonate and 2g of starch, then knead the uniformly mixed material with 55g of water, and add the kneaded uniform mass into the extruder Extrude to obtain strip-shaped particles, put the strip-shaped particles into a spheronizer for spheronizing to obtain spherical particles; then dry the obtained spheres at 100° C. for 4 hours. The dried spherical adsorbent was roasted at 730°C for 3 hours once, and the roasted adsorbent was placed in a constant temperature and humidity box at a temperature of 95°C and a relative humidity of 90% for 3 hours, and then in 1mol / L CaCl 2 The solution was exchanged at 90°C for 3h, dried at 100°C for 4h, and then calcined at 350°C for 3h to obtain a spherical 5A molecular sieve adsorbent.

Embodiment 2

[0027] Mix 81g of NaA molecular sieve raw powder, 11g of kaolin, 10g of sodium carbonate and 3g of scallop powder, then knead the uniformly mixed material with 58g of water, and add the uniformly kneaded dough into the extruder Carry out extruding, and put the obtained strip-shaped particles into a spheronizer for spheronizing to obtain spherical particles, and then dry the obtained spherical particles at 120° C. for 1.5 hours. The dried spherical adsorbent was roasted once at 680°C for 7 hours, and the roasted adsorbent was placed in a constant temperature and humidity box at a temperature of 70°C and a relative humidity of 100% for 7 hours, and then heated at 0.5mol / L Ca solution (where, OH - :Cl - =1:100), exchanged at 70°C for 6h, dried at 120°C for 1.5h, and then calcined at 320°C for 4h to obtain spherical 5A molecular sieve adsorbent.

Embodiment 3

[0029] Mix 75g of NaA molecular sieve raw powder, 14g of kaolin, 13g of sodium carbonate, 2g of starch and 0.5g of tannin extract, then fully knead the uniformly mixed material with 54g of water, and add the kneaded uniform mass to the extruder Extrude the strips in the strip machine, put the obtained strip-shaped particles into a spheronizer for spheronizing to obtain spherical particles, and then dry the obtained spherical particles at 70°C for 12 hours. The dried spherical adsorbent was once calcined at 630°C for 7h, put the calcined adsorbent into deionized water at a temperature of 98°C for 3h, and then in 2mol / L Ca solution (wherein, OH - :Cl - =1:1000), exchanged at 95°C for 1.5 h, dried at 130°C for 1 h, and then calcined at 370°C for 2 h to obtain a spherical 5A molecular sieve adsorbent.

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Abstract

The invention discloses a preparation method of a 5A molecular sieve adsorbent. The method comprises the following steps: mixing and kneading 4A molecular sieve raw powder, clay, sodium carbonate, an auxiliary agent and water according to a ratio to obtain a wet material mass; forming the lumps to obtain strip-shaped particles, and rounding the strip-shaped particles to obtain spherical particles; drying and roasting the spherical particles; carrying out crystallization reaction on the roasted material, so that the binder is subjected to solid-state crystal transformation; and carrying out ion exchange on the obtained product in a calcium solution, and then drying and roasting to obtain the 5A molecular sieve adsorbent. The method omits an alkali treatment step, reduces waste liquid discharge, and is easy to operate; the prepared spherical 5A molecular sieve adsorbent has the characteristics of high adsorption capacity, high mass transfer rate, high compressive strength and the like.

Description

technical field [0001] The patent of the present invention relates to a preparation method of a 5A molecular sieve adsorbent used for PSA hydrogen purification, PSA oxygen production and dewaxing. Background technique [0002] Pressure Swing Adsorption (PSA) separation technology uses the difference in the adsorption capacity of solid adsorbents for gas components at different pressures and the selective adsorption of different components, by periodically changing the pressure of the adsorption bed To achieve the purpose of gas component separation. [0003] Adsorbent is the core of PSA separation technology, mainly including alumina, silica gel, activated carbon and molecular sieve adsorbent. Among them, molecular sieve adsorbent is the core of all adsorbents. Generally, the synthesized molecular sieve is in powder form and needs to be molded with a binder before it can be used. However, the presence of the binder in the molded molecular sieve will reduce the effective ut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/28B01J20/30
CPCB01J20/186B01J20/28019B01J20/3042B01J20/3007B01J20/3078B01J20/3085
Inventor 范得权张延鹏杨阳张胜中王红涛张英
Owner CHINA PETROLEUM & CHEM CORP
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