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Preparation method of X-type molecular sieve/LDHs composite adsorbent for separating methane and nitrogen through pressure swing adsorption

A methane separation and pressure swing adsorption technology, which is applied in the preparation of adsorbents and composite adsorbents, can solve the problems of less research and development of activated carbon adsorbents, difficulty in meeting the requirements for selective separation of methane/nitrogen adsorption, and achieve easy implementation, The effect of mild reaction conditions and enhanced adsorption effect

Active Publication Date: 2016-06-22
YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key factor affecting the separation of methane / nitrogen by PSA is the adsorbent. The development of its adsorbent has been concerned all over the world. The adsorbents currently used are generally difficult to meet the adsorption selective separation requirements of methane / nitrogen.
Activated carbon is the most important and widely used adsorbent, but there is still little research and development of activated carbon adsorbents for methane / nitrogen separation, and there is currently no activated carbon adsorbent product specifically for this system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method of an X-type molecular sieve / LDHs composite adsorbent for separating methane and nitrogen by pressure swing adsorption, comprising the following steps:

[0019] 1) Weigh 150gAl(NO 3 ) 3 9H 2 O and 51.3gMg(NO 3 ) 2 ·6H 2 O was dissolved in 1200 mL of deionized water to make a total concentration of 0.5 mol L -1 Mixed salt solution, weigh 80g NaOH and dissolve in 400ml deionized water to prepare 5mol L -1 Add the NaOH solution drop by drop to the mixed salt solution under stirring conditions, keep the pH value of the system at 9-10 during the dropwise addition, continue stirring and aging for 3 hours after the NaOH solution is added dropwise, and the obtained product Filter, wash with deionized water repeatedly 3 times, and place in a constant temperature drying oven at 100°C for 6 hours to obtain a hydrotalcite sol with a solid content of 2 wt%.

[0020] 2) Weigh 100g of NaX molecular sieve with a thickness of 0.1-1μm and add it to 500ml of po...

Embodiment 2

[0024] A preparation method of an X-type molecular sieve / LDHs composite adsorbent for separating methane and nitrogen by pressure swing adsorption, comprising the following steps:

[0025] 1) Weigh 150gAl(NO 3 ) 3 9H 2 O and 51.3gMg(NO 3 ) 2 ·6H 2 O was dissolved in 1200 mL of deionized water to make a total concentration of 0.5 mol L -1 Mixed salt solution, weigh 80g NaOH and dissolve in 400ml deionized water to prepare 5mol L -1 Add the NaOH solution drop by drop to the mixed salt solution under stirring conditions, keep the pH value of the system at 9-10 during the dropwise addition, continue stirring and aging for 3 hours after the NaOH solution is added dropwise, and the obtained product Filter, wash with deionized water repeatedly 3 times, and place in a constant temperature drying oven at 100°C for 6 hours to obtain a hydrotalcite sol with a solid content of 2 wt%.

[0026] 2) Weigh 100g of 0.1-1μm NaX molecular sieve and add it to 500ml of sodium dodecylbenzenes...

Embodiment 3

[0030] A preparation method of an X-type molecular sieve / LDHs composite adsorbent for separating methane and nitrogen by pressure swing adsorption, comprising the following steps:

[0031] 1) Weigh 150gAl(NO 3 ) 3 9H 2 O and 51.3gMg(NO 3 ) 2 ·6H 2 O was dissolved in 1200 mL of deionized water to make a total concentration of 0.5 mol L -1 Mixed salt solution, weigh 80g NaOH and dissolve in 400ml deionized water to prepare 5mol L -1 Add the NaOH solution drop by drop to the mixed salt solution under stirring conditions, keep the pH value of the system at 9-10 during the dropwise addition, continue stirring and aging for 3 hours after the NaOH solution is added dropwise, and the obtained product Filter, wash with deionized water repeatedly 3 times, and place in a constant temperature drying oven at 100°C for 6 hours to obtain a hydrotalcite sol with a solid content of 2 wt%.

[0032] 2) Weigh 50g of 0.1-1μm NaX molecular sieve and add it to 500ml of sodium lignosulfonate a...

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Abstract

The invention relates to a preparation method of an X-type molecular sieve / LDHs composite adsorbent for separating methane and nitrogen through pressure swing adsorption. The preparation method comprises the following steps: performing reaction and modification on an X-type molecular sieve and an anionic surfactant or anionic polyelectrolyte under a hydrothermal condition to make the surface of the X-type molecular sieve have negative charges, and compounding the X-type molecular sieve with LDHs to form a composite material according to the principle that anions between layers of LDHs can be plugged in a replacing manner. The preparation method has the beneficial effects that the X-type molecular sieve which is modified by the anions and is provided with the negative charges is plugged between the layers of LDHs, so that the adsorption function of the X-type molecular sieve is realized; furthermore, under the electrostatic effect between the X-type molecular sieve and LDHs laminate, the charge distribution of the X-type molecular sieve is changed, so that the adsorption effect of the X-type molecular sieve for N2 in a PSA process is greatly enhanced.

Description

technical field [0001] The invention relates to a method for preparing an adsorbent, in particular to a method for preparing a composite adsorbent for adsorbing and separating methane and nitrogen, and belongs to the technical field of adsorbent preparation. Background technique [0002] Methane is an efficient and clean energy source and an important chemical raw material. Separating and purifying methane from coalbed methane, natural gas, oilfield gas, etc. has positive significance for protecting the ecological environment and alleviating the energy crisis. The main components of coalbed methane, natural gas and oil field gas are CO 2 、CH 4 and N 2 Wait, CO 2 with CH 4 The physical properties of the molecules are very different, and they are easy to separate, but the N 2 with CH 4 The critical temperature of the two is very low, the physical properties of the two are similar, the kinetic diameter is similar, and it is not easy to separate, so the key to separating m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/18B01D53/04C10L3/10
CPCB01D53/047B01D2256/245B01D2257/102B01J20/08B01J20/18B01J20/183B01J20/186C10L3/105
Inventor 王绚
Owner YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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