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A kind of 5a molecular sieve adsorbent and its preparation method and application

A molecular sieve and adsorbent technology, applied in the field of 5A molecular sieve adsorbent, can solve problems such as difficult treatment of ammonia nitrogen sewage, difficult pollution control, excessive COD of sewage, etc., and achieve high adsorption efficiency, high content of 5A molecular sieve, and large adsorption capacity.

Active Publication Date: 2020-08-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process brings two major pollutions in the production process, and the resulting pollution is difficult to control, especially the use of inorganic ammonium salts will produce ammonia nitrogen sewage that is difficult to treat, and the use of surfactants will make the COD of sewage exceed the standard

Method used

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  • A kind of 5a molecular sieve adsorbent and its preparation method and application

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Embodiment approach

[0023] According to a preferred embodiment of the present invention, the ambient humidity of stage (3) is preferably higher than that of stage (1).

[0024] According to a more preferred embodiment of the present invention, the ambient humidity of stage (1) is 20-40% RH, the ambient humidity of stage (2) is 10-15% RH, and the ambient humidity of stage (3) is 50-90 %RH.

[0025] According to the method of the present invention, the purpose of the present invention can be realized as long as it is ensured that the pre-wetting is carried out according to the aforementioned steps before the matrix pellet is carried out to crystallization, and for the present invention, in order to further improve the positive The pentadecane adsorption capacity is preferably 15% by weight or more, preferably 18-22% by weight, after the pre-wetting of the matrix pellets after the stages (1), (2) and (3).

[0026] According to the method of the present invention, RH refers to relative humidity, spe...

Embodiment 1

[0066] (1) Get 400kg of commercially available 4A molecular sieve former powder (moisture content is 21% by weight, average grain diameter is 0.7μm, methanol adsorption capacity is 181mg / g) and kaolin 20kg (water content is 22% by weight) ), 10kg of safflower powder pore-forming agent was put into a twin-screw mixer and mixed for 3 hours, and 50kg of the mixed material was taken out, and put into a rolling ball pot (sugar-coated pot) with a diameter of 1.2m to carry out rolling ball molding to make small The operating conditions in the ball (rolling ball pot include: the speed control is 30 rpm, the water addition rate is based on the water content of the material increasing by 3-5% by weight per hour, and when the final moisture content of the material reaches 45-50% by weight, stop adding water , then keep the rotating speed of the rolling ball pot at 30-40 rpm, and continue to rotate for 3-5 hours), when the ball grows to a diameter of 0.3-1.0mm, polish it for 1-2 hours, and...

Embodiment 2

[0081] Prepare 5A molecular sieve adsorbent pellets according to the method of Example 1, the difference is that the stage (1), stage (2), and stage (3) are successively pre-wetted, and the ambient humidity of stage (1) is 40% RH, The environmental humidity of stage (2) is 15%RH, and the environmental humidity of stage (3) is 55%RH, and the moisture content of the substrate pellet after prewetting is 22% by weight, and the substrate pellet that prewets is sent into synthetic kettle In contact with sodium hydroxide aqueous solution to carry out two-stage crystallization treatment, the first stage temperature is 50 ° C, time is 3 hours, the second stage temperature is 90 ° C, time is 3 hours; the rest of the conditions are the same, and 5A molecular sieve pellets are obtained. Adsorbent (the water content of the adsorbent is 2.5% by weight, based on the dry weight of the adsorbent, the content of 5A molecular sieve is 98.5% by weight, and the diameter is 0.3-0.9mm. Related proper...

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Abstract

The invention relates to the field of adsorbents, and concretely provides a 5A molecular sieve adsorbent, and a preparation method and an application thereof. The method comprises the following steps:(1) carrying out rolling molding on a powder containing 4A molecular sieve and a binder source to obtain pellets, and drying and calcining the pellets to obtain matrix pellets; (2) pre-wetting the matrix pellets, and carrying out crystal transformation to basically convert the binder in the matrix pellets into 4A molecular sieve in order to obtain 4A molecular sieve pellets; and (3), washing the4A molecular sieve pellets with water, carrying out calcium exchange to obtain 5A molecular sieve pellets, washing the 5A molecular sieve pellets with water, drying the washed 5A molecular sieve pellets, and calcining the dried 5A molecular sieve pellets, wherein the pre-wetting process comprises a stage (1), a stage (2) and a stage (3), and the ambient humidity in the stage (1) and the ambient humidity in the stage (3) are higher than the ambient humidity in the stage (2). The 5A molecular sieve adsorbent has the advantages of high 5A molecular sieve content, large n-pentadecane adsorbing capacity, high adsorbing efficiency and good strength.

Description

technical field [0001] The invention relates to a 5A molecular sieve adsorbent, a preparation method and application thereof. Background technique [0002] The molecular diameter of normal alkanes in petroleum oils is less than 5A, while the molecular diameters of other isoparaffins, naphthenes, and aromatics are all greater than 5A. According to the adsorption characteristics of molecular sieves, 5A molecular sieves can be used as adsorbents to separate them from petroleum oils. Adsorbed normal alkanes. At present, the separation technology of n-alkanes in petroleum oil mainly adopted by foreign industrial installations is the Molex molecular sieve dewaxing process developed by UOP Company of the United States. Most of the molecular sieve dewaxing adsorbents used are ADS-12 and ADS- 14. ADS-34 and other series products. [0003] The NWA-ⅡB molecular sieve adsorbent of Sinopec Catalyst Nanjing Branch adopts self-developed technology, first sprays silicon pellets, and then ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/18B01J20/28B01J20/30C10G25/00
CPCB01J20/18B01J20/28019B01J20/2808B01J20/3042C10G25/003
Inventor 涂长志陈世华丁云龙
Owner CHINA PETROLEUM & CHEM CORP
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