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Adsorbent for Water Adsorption and Desorption

a technology of adsorbent and water, which is applied in the field of adsorbent, can solve the problems of increasing operation costs, reducing the humidity of a room, and no detailed explanation of the adsorbent used in the equipment, and achieves outstanding adsorption capacity and adsorption characteristics, and high adsorption capacity for water

Inactive Publication Date: 2009-05-21
KOREA RES INST OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The present invention provides an adsorbent by using hybrid inorganic-organic materials that desorb water easily even at low temperature and the difference between the adsorption capacity at high temperature and the adsorption capacity at low temperature is high.

Problems solved by technology

Likewise, a cooler, if an adsorbent is incorporated, may decrease the humidity of a room by adsorbing water at low temperature.
However, there is no detailed explanation on the adsorbents used in the equipments.
Moreover, the adsorbents have drawbacks of low adsorption capacity, and the desorption temperature is higher than 100° C., leading to the increase of operation costs.
However, there always remain problems of difficult desorption if the adsorption capacity is high; and the difference between adsorption capacity and the remaining water after desorption is small when the adsorption capacity is small.
However, the methods of the previous embodiments using electric heating are not economical because of the long reaction time.
Moreover, the methods do not provide hybrid inorganic-organic material with size less than 500 nm, or more preferably less than 100 nm, because amorphous hybrid inorganic-organic materials are obtained when the reaction duration is decreased in order to obtain small crystal particles.

Method used

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  • Adsorbent for Water Adsorption and Desorption
  • Adsorbent for Water Adsorption and Desorption
  • Adsorbent for Water Adsorption and Desorption

Examples

Experimental program
Comparison scheme
Effect test

example 2

Cr-BDCA-2

[0039]The synthesis of a porous hybrid inorganic-organic material was carried out as Example 1, except that ultrasonic pretreatment was omitted and the reaction time was 2 min. X-ray diffraction patterns of FIG. 3a show that a material with structure same as Example 1 was obtained, and SEM image confirms that a porous hybrid inorganic-organic material with homogeneous size of 40-50 nm was obtained. The porous hybrid inorganic-organic material, after evacuation at 150° C. under vacuum, has nitrogen adsorption capacity of 1050 mL / g or 46.9 mmol / g at relative pressure of 0.5 (P / Po=0.5, at liquid nitrogen temperature). Moreover, the porous hybrid inorganic-organic material has high benzene adsorption capacity (16 mmol / g) at 30° C. and relative pressure of 0.5 (P / Po=0.5). At this time, the average pore size of the hybrid inorganic-organic material is 1.3 nm. The adsorption isotherms of nitrogen and benzene are shown in FIG. 4.

[0040]The surface area and pore volume of the hybrid ...

example 3

Cr-BDCA-3

[0041]The synthesis of a porous hybrid inorganic-organic material was carried out as Example 2, except that the reaction time was 40 min. X-ray diffraction patterns of FIG. 3b show that a material with structure same as Example 1 was obtained, and SEM image (FIG. 2) confirms that a porous hybrid inorganic-organic material with homogeneous size of 200 nm was obtained even though the crystal size increased considerably compared with the size of Example 2. The surface area and pore volume of this material are 3900 m2 / g and 2.1 mL / g, respectively.

example 4

Fe-BDCA-1

[0042]The synthesis of a porous hybrid inorganic-organic material was carried out as Example 2, except that FeCl3 was used instead of Cr(NO3)3-9H2O. X-ray diffraction patterns showed that a material with structure same as Example 1 was obtained, and SEM image confirmed that a porous hybrid inorganic-organic material with homogeneous size of 50-100 nm was obtained.

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Abstract

The present invention relates to an adsorbent obtained by using porous hybrid inorganic-organic materials that have high surface area, and have pore with the size of molecules or nanometers. More specifically, the present invention relates to a water adsorbent showing facile adsorption-desorption even below 100° C., having high adsorption capacity, and having high desorption capacity when it is heated up to the temperature below 100° C. The adsorbent of the present invention can be applied to a humidifier, dehumidifier, cooler and heater. The present invention also relates to a technology to control humidity using the adsorbent.

Description

TECHNICAL FIELD[0001]The present invention relates to an adsorbent over which the adsorption and desorption processes of water are facile at the temperature of less than 100° C. and the difference between the adsorption capacity at adsorption condition and the adsorption capacity at desorption condition is high. More particularly, present invention relates to an adsorbent using porous inorganic-organic hybrid materials that have pores of nanometer-size and the pore volume and surface area are very large.BACKGROUND ART[0002]An adsorbent that adsorbs and desorbs water has various uses. For example, a dehumidifier can utilize an adsorbent that adsorbs water at low temperature, while desorbs water when it is heated at high temperature. Moreover, a heater may humidify like a humidifier by desorbing adsorbed water, at high temperature, which is adsorbed from outside environment at low temperature, if an adsorbent is used in a heater. Likewise, a cooler, if an adsorbent is incorporated, ma...

Claims

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Application Information

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IPC IPC(8): B32B3/26
CPCB01J20/02B01J2220/68B01J20/0218B01J20/0229B01J20/226B01J20/28066B01J20/28076B01J20/2808B01J20/30B01J20/3204B01J20/3208B01J20/3236B01J20/3242B01J20/3248B01J20/3255C07F11/005B01D53/263B01D53/28B01D2253/204B01D2253/304B01D2253/306B01D2253/308B01D2253/311B01J20/28033B01J20/0214B01J20/3078B01J20/3085B01J20/00B01J20/22B82Y30/00
Inventor CHANG, JONG-SANJHUNG, SUNG-HWAHWANG, YOUNG-KYU
Owner KOREA RES INST OF CHEM TECH
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