5A molecular sieve adsorbent as well as preparation method and application thereof

A molecular sieve and adsorbent technology, which is applied in the field of 5A molecular sieve adsorbent and its preparation, can solve the problem of insufficient heavy wax adsorption, and achieve the effect of high content of 5A molecular sieve, large adsorption capacity and high adsorption efficiency

Active Publication Date: 2019-05-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still has a lot of room for improvement in terms of crystal transformation and adsorbent activation.
Especially heavy wax (normal alkanes with carbon number greater than 14) is seriously insufficient in adsorption

Method used

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  • 5A molecular sieve adsorbent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] (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

[0102]Prepare 5A molecular sieve adsorbent beads according to the method of Example 1. The difference is that the ambient humidity of stage (1) is 30% RH, and the ambient humidity of stage (2) is 80% RH, so that the water content of the matrix beads reaches 20% % by weight; all the other conditions are the same to obtain the 5A molecular sieve pellet adsorbent (the water content of the adsorbent is 2.8% by weight, in terms of dry weight of the adsorbent, the content of the 5A molecular sieve is 97.0% by weight, and the diameter is 0.3-0.9mm. The average particle size of the agent is 0.7μm, n(SiO 2 ) / n(Al 2 o 3 ) molar ratio is 1.99, specific surface area is 517m 2 / g, the range of molecular sieve crystal grains is 0.44-0.68, and the mass percentage is 53%, and related properties such as the adsorption capacity of n-pentadecane are shown in Table 1).

Embodiment 3

[0104] Prepare 5A molecular sieve adsorbent beads according to the method of Example 1, the difference is,

[0105] Send the pre-wetted matrix pellets into the synthesis kettle to contact with the sodium hydroxide aqueous solution to carry out crystal transformation treatment, wherein the volume ratio of the sodium hydroxide aqueous solution to the pre-wetted matrix pellets is 2.5, and the sodium hydroxide aqueous solution The concentration is 0.12mol / L, wherein, the temperature is 96°C, and the time is 3 hours. All the other conditions are the same, obtain the 5A molecular sieve pellet adsorbent (the water content of the adsorbent is 2.9% by weight, in terms of the dry weight of the adsorbent, the content of the 5A molecular sieve is 97.0% by weight, the diameter is 0.3-0.9mm, and the average particle size of the adsorbent is The diameter is 0.8μm, n(SiO 2 ) / n(Al 2 o 3 ) The molar ratio is 2.00, and the specific surface area is 515m 2 / g, the range of molecular sieve crys...

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Abstract

The invention relates to the field of molecular sieve adsorbents and specifically discloses a 5A molecular sieve adsorbent as well as a preparation method and application thereof. According to the 5Aadsorbent disclosed by the invention, the content of 5A molecular sieves in the adsorbent is 92 weight % or more according to the dry weight of the adsorbent; the breakage rate of the adsorbent under250 N is 6.9% or less; furthermore, the n-pentadecane adsorption quantity of the adsorbent is 103 mg / g or more. The 5A molecular sieve adsorbent disclosed by the invention has the advantages of high molecular sieve content, good strength, and large adsorption quantity and is especially suitable for adsorbing n-pentadecane.

Description

technical field [0001] The invention relates to the field of molecular sieve adsorbents, in particular to a 5A molecular sieve adsorbent and its preparation method and application. Background technique [0002] N-alkane is an important chemical raw material, and adsorption and separation by molecular sieve is an important production method. The average molecular pore diameter of 5A molecular sieve is 5A, and the molecular diameter of normal alkanes in petroleum oil products is less than 5A, which can enter the pores of molecular sieve. The molecular diameters of other isoparaffins, naphthenes, and aromatics are larger than 5A. According to the adsorption characteristics of molecular sieves, using 5A molecular sieves as an adsorbent can separate and adsorb n-paraffins from petroleum oils. [0003] CN87105499A discloses a method for preparing a binder-free spherical A-type molecular sieve. The method uses inorganic ammonium salts, inorganic acids, and water glass as raw mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/30C10G73/42
Inventor 涂长志陈世华
Owner CHINA PETROLEUM & CHEM CORP
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