Adsorbent for adsorbing n-alkanes and preparation method and application thereof

A technology of n-paraffin and adsorbent, which is applied in the field of modified 5A molecular sieve adsorbent and its preparation, can solve the problems affecting selective adsorption performance, orifice effect, etc., and achieve the effect of improving selective adsorption performance

Pending Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In summary, the adsorption capacity, adsorption rate and stability of the 5A molecular sieve adsorbent prepared by the prior art need to be further improved, and the 5A molecular sieve adsorbent is modified by impregnating the 5A molecular sieve adsorbent with an alkaline solution or an ethanol solution of oxalic acid, which will adsorb 5A molecular sieve. The orifice of the agent has a certain influence on the selective adsorption performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh an appropriate amount of spherical 5A molecular sieve ((commercial goods, the main properties are as follows: specific surface: 680cm 2 / g Pore volume: 0.18cm 3 / g, average pore diameter: 1.7nm, particle diameter: 1.6mm~2.3mm), the 5A molecular sieve was protected and impregnated with a glucose solution with a mass concentration of 10%, dried at 110°C for 3h after impregnation, and roasted at 450°C for 4h under a nitrogen atmosphere. ;

[0029] (2) Under the condition of 60°C, saturate and impregnate the material in step 1 with a 35% ammonium carbonate aqueous solution by mass for 1 hour;

[0030] (3) The material in step (2) was vacuum-dried at 120° C. for 4 hours, calcined at 600° C. for 4 hours, and calcined in an air atmosphere to obtain a modified 5A molecular sieve.

[0031] Static performance evaluation of modified 5A molecular sieve adsorbent: After drying, the modified 5A molecular sieve adsorbent was activated at 350°C for 2 hours, and cooled to ro...

Embodiment 2

[0034] (1) Weigh an appropriate amount of spherical 5A molecular sieve ((commercial goods, the main properties are as follows: specific surface: 680cm 2 / g Pore volume: 0.18cm 3 / g, average pore diameter: 1.7nm, particle diameter: 1.6mm~2.3mm), 5A molecular sieves were protected and impregnated with a sucrose solution with a mass concentration of 25%, dried at 140°C for 1h after impregnation, and roasted at 300°C for 8h under a nitrogen atmosphere. ;

[0035] (2) Under the condition of 90°C, saturate and impregnate the material in step (1) with a 20% aqueous solution of ammonium bicarbonate by mass for 1 hour;

[0036] (3) The material in step (2) was vacuum-dried at 80°C for 8 hours, calcined at 400°C for 8 hours, and calcined in an air atmosphere to obtain a modified 5A molecular sieve.

[0037] Static performance evaluation of modified 5A molecular sieve adsorbent: After drying, the modified 5A molecular sieve adsorbent was activated at 350°C for 2 hours, and cooled to ro...

Embodiment 3

[0040] (1) Weigh an appropriate amount of spherical 5A molecular sieve ((commercial goods, the main properties are as follows: specific surface: 680cm 2 / g Pore volume: 0.18cm 3 / g, average pore diameter: 1.7nm, particle diameter: 1.6mm~2.3mm), the 5A molecular sieve was protected and impregnated with a fructose solution with a mass concentration of 15%, dried at 125°C for 2.5h after impregnation, and roasted at 380°C under a nitrogen atmosphere 6h;

[0041] (2) Under the condition of 75°C, use a phosphoric acid aqueous solution with a mass content of 30% to saturate the impregnation treatment step (1 material 2h;

[0042] (3) The material in step (2) was vacuum-dried at 120°C for 8 hours, calcined at 500°C for 8 hours, and calcined in an air atmosphere to obtain a modified 5A molecular sieve.

[0043] Static performance evaluation of modified 5A molecular sieve adsorbent: After drying, the modified 5A molecular sieve adsorbent was activated at 350°C for 2 hours, and cooled ...

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Abstract

The invention discloses an adsorbent for adsorbing n-alkanes and a preparation method and application of the adsorbent. The preparation method of the adsorbent for adsorbing n-alkanes comprises the following steps: (1) carrying out dipping treatment on a 5A molecular sieve by adopting a sugar solution, drying after dipping treatment, and roasting in an inert atmosphere; (2) carrying out dipping treatment on the material obtained in the step (1) by adopting a solution containing a chemical pore-enlarging agent; and (3) drying and roasting the material obtained in the step (2) to obtain a modified 5A molecular sieve. The molecular sieve for adsorbing n-alkanes prepared by the method has the advantages of high adsorption capacity, high adsorption rate and the like.

Description

technical field [0001] The invention relates to an adsorbent for adsorbing normal alkanes, its preparation method and application, in particular to a modified 5A molecular sieve adsorbent for adsorbing normal alkanes, its preparation method and application. Background technique [0002] The main channel of 5A molecular sieve is an internal pore volume of 0.776 nm 3 The cubic sodium lattice has a pore size of about 0.5 nm, allowing molecules with a molecular diameter of less than 0.5 nm to pass through. Due to its shape-selective adsorption, 5A molecular sieve is widely used in the separation process of normal alkanes and non-normal hydrocarbons in various petroleum raw materials, forming a fixed bed process for gas-solid adsorption and a simulated moving bed process for liquid-solid adsorption. [0003] 5A molecular sieve is an efficient adsorption material for the selective separation of normal alkanes in naphtha fractions. Naphtha is composed of a mixture of normal alkan...

Claims

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Application Information

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IPC IPC(8): B01J20/16B01J20/30C10G25/03
CPCB01J20/16B01J20/30C10G25/03C10G2300/1037
Inventor 王海洋李杰张信伟
Owner CHINA PETROLEUM & CHEM CORP
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