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MoFs adsorbent and application thereof

An adsorbent and adsorption tower technology, applied in the field of new porous adsorption materials, can solve the problems of limited separation capacity and low adsorption capacity of n-isoparaffin mixture, and achieve improved adsorption separation performance, increase adsorption capacity, and reduce desorption temperature. Effect

Active Publication Date: 2015-11-18
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The metal-organic framework materials mentioned above have limited separation ability for n-isoparaffin mixtures, and the adsorption capacity is not large

Method used

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  • MoFs adsorbent and application thereof
  • MoFs adsorbent and application thereof
  • MoFs adsorbent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] With 100gZIF-76 powder (its cage-like skeleton structure is as figure 1 Shown), 5g of kaolin and 3g of fennel powder were mixed well, slowly added 30g of water and kneaded evenly, extruded into strips, dried at 80°C, and calcined at 200°C for 3h to obtain shaped ZIF-76 adsorbent. Fill the shaped ZIF-76 adsorbent in the adsorption tower, use the alkane mixture with n-heptane content of 95% as the raw material for adsorption and separation, and the remaining components in the mixture are C6 and C7 isoparaffins. After the alkane mixture is vaporized at 120°C, in 35h -1 The space velocity enters the adsorption tower, the adsorption temperature is 150°C, and the adsorption pressure is 0.1MPa in gauge pressure. After the adsorption is completed, carbon dioxide gas is used to purge and desorb. The preheating temperature of the purge gas is 120°C and the space velocity is 600h. -1 , The desorption temperature of the adsorption tower is 120°C, and the desorption pressure is 0....

Embodiment 2

[0027] With 100gUiO-66 powder (its cage-like skeleton structure is as figure 2 shown), 50g of pseudo-boehmite and 60g of carboxymethyl cellulose were mixed well, slowly added 20g of distilled water and kneaded evenly, extruded into strips, dried at 100°C, and roasted at 350°C for 0.5h to obtain a shaped UiO-66 adsorbent. Fill the formed UiO-66 adsorbent in the adsorption column, use the alkane mixture with n-hexane content of 80% as the raw material for adsorption and separation, and the remaining components in the mixture are C5 and C6 isoparaffins. After the alkane mixture is vaporized at 100°C, it takes 480h -1 The space velocity enters the adsorption tower, the adsorption temperature is 280°C, and the adsorption pressure is 1.5MPa in gauge pressure. After the adsorption is completed, nitrogen purging is used for desorption, the preheating temperature of the purging gas is 220°C, and the space velocity is 50h -1 , The desorption temperature of the adsorption tower is 30...

Embodiment 3

[0029] According to the method and steps described in Example 2, 20g of polyethylene glycol and 30g of pseudoboehmite were added to the binder to obtain a shaped UiO-66 adsorbent, and the shaped UiO-66 adsorbent was applied to a compound containing 85% n-hexane The alkane mixture is separated, the adsorption and desorption pressures are both 0 MPa, and the purity of n-hexane is above 99% within 2 to 45 minutes of adsorption.

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Abstract

The invention relates to a MoFs adsorbent and application thereof. The adsorbent is prepared by the following steps: as the weight of metal organic framework material raw powder is used as the base, adding a binder accounting for 2-50% of the metal organic framework material raw powder in weight, an extrusion aid accounting for 3-60% of the metal organic framework material raw powder in weight, and water accounting for 1-30% of the metal organic framework material raw powder in weight into the metal organic framework material raw powder, stirring and kneading uniformly, and forming; and stoving, and roasting so as to obtain the formed MoFs adsorbent. A metal organic framework material is selected from one of ZIF-76, UiO-66, UiO-67 or MIL-125; the MoFs adsorbent is used for adsorbing isoparaffins from an alkane mixture in a back-shape-selective manner; the MoFs adsorbent has relatively high adsorption capacity or relatively high adsorption acting force on one or more kinds of isoparaffins, so that the isoparaffins are more preferentially adsorbed as compared with n-alkanes in an adsorption separation process; meanwhile, as the metal organic framework material has large specific surface area and pore volume, the adsorption capacity on alkanes is large, and the high-efficiency separation on n-alkanes and isoparaffins can be realized.

Description

technical field [0001] The invention belongs to a novel porous adsorption material and its application in the field of chemical industry, and in particular relates to a MOFs adsorbent and its application. Background technique [0002] Adsorption separation is an important method for the production of high-purity alkanes. The principle is that through the interaction between the adsorbate and the surface of the adsorbent, the adsorbate molecules with strong force are preferentially concentrated on the surface of the adsorbent, resulting in selective adsorption, thereby separating the adsorbate mixture. At present, 5A molecular sieve is the most commonly used adsorbent for the adsorption and separation of n-isomeric alkanes. Generally, sodium silicate, sodium aluminate and a certain amount of sodium hydroxide are used in the industry to obtain 4A molecular sieve raw powder through hydrothermal crystallization. The raw molecular sieve powder is passed through After adding a bin...

Claims

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Application Information

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IPC IPC(8): B01J20/22C07C7/12C07C9/15
Inventor 崔群张清生王海燕陈思伽
Owner NANJING UNIV OF TECH
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