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Composite adsorbent and preparation method thereof

A composite adsorption and mixed liquid technology, which is applied in chemical instruments and methods, and other chemical processes, can solve problems such as easy agglomeration, looseness or delamination or peeling, poor mechanical properties, etc., to improve heat and mass transfer capabilities, The preparation method is simple and easy, and the effect of improving mechanical properties

Inactive Publication Date: 2013-07-10
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0003] However, there are still great difficulties in the application of adsorption refrigeration, mainly because there are many defects in the adsorbent, such as easy agglomeration, poor heat and mass transfer performance, and poor mechanical properties.
Chinese patent CN1613551 discloses a calcium chloride-expanded graphite mixed adsorbent. In this patent, expanded graphite is mixed with calcium chloride aqueous solution, dried and pressed into a block mixed adsorbent, which solves the problem of adsorbent agglomeration
However, the mechanical properties of the above two adsorbents are still poor. After several cycles of adsorption and desorption, the bulk adsorbents will loosen, delaminate or peel off, which seriously affects the repeated use of the adsorbents.

Method used

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  • Composite adsorbent and preparation method thereof

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preparation example Construction

[0024] Correspondingly, the present invention also provides a kind of preparation method of above-mentioned composite adsorbent, comprises the following steps:

[0025] Step 1: Dissolve calcium chloride and polyethylene oxide to obtain a precursor solution. The method for dissolving calcium chloride and polyoxyethylene in the present invention is not particularly limited, methods well known to those skilled in the art can be used, such as dissolving calcium chloride first, then adding polyoxyethylene, or adding chloride chloride to water at the same time. Calcium and polyethylene oxide are dissolved together, and in order to make the dissolution more rapid, they may be stirred or heated during the dissolution.

[0026] The second step: adding expanded graphite to the precursor solution obtained in the first step to obtain a mixed solution. Those skilled in the art will easily know that in order to disperse the expanded graphite uniformly in the precursor solution, the precurs...

Embodiment 1

[0032] Take 1000ml of water, dissolve 8.00g of calcium chloride in it, weigh 4.00g of polyethylene oxide and slowly dissolve in the calcium chloride solution after the calcium chloride is completely dissolved, and dissolve the polyethylene oxide completely to obtain the precursor solution; Insulate at 500° C. for 8 minutes to prepare expanded graphite; then weigh 8.00 g of expanded graphite and put it into the precursor solution, and stir for 1 minute until the expanded graphite is evenly dispersed to obtain a mixed solution. Put the mixed solution in a drying oven at 95° C. for 2 to 3 days until the mixed solution is completely dried to obtain the mixed solution powder. Weigh 4.00g of the powder and place it in a mold and press it under a pressure of 20MPa for 5min to obtain a block-shaped composite adsorbent.

[0033] The obtained composite adsorbent is placed in an outdoor environment, and after 1 to 2 days, it is observed that the composite adsorbent does not have any loos...

Embodiment 2

[0035] Take 2500ml of water, dissolve 7.50g of calcium chloride in it, weigh 15.00g of polyethylene oxide and slowly dissolve in the calcium chloride solution after the calcium chloride is completely dissolved, and dissolve the polyethylene oxide completely to obtain the precursor solution; the expandable graphite Insulate at 700° C. for 12 minutes to prepare expanded graphite; then weigh 15.00 g of expanded graphite and put it into the precursor solution, and stir for 1 minute until the expanded graphite in the solution is uniformly dispersed to obtain a mixed solution. Put the mixed solution in a drying oven at 90° C. for 2 to 3 days until the mixed solution is completely dried to obtain the mixed solution powder. Weigh 3.50g of powder and place it in a mold and press it under 20MPa pressure for 5min to obtain block composite adsorbent.

[0036] The obtained composite adsorbent is placed in an outdoor environment, and after 1 to 2 days, it is observed that the composite adso...

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Abstract

The invention discloses a composite adsorbent and a preparation method thereof. The composite adsorbent comprises calcium chloride, expanded graphite and polyethylene oxide. According to the composite adsorbent and the preparation method thereof, the heat and mass transfer ability of the adsorbent is improved to prevent the agglomeration of the adsorbent through the mixing of the expanded graphite and the calcium chloride, and meanwhile, the phenomena of loosening, layering, falling off and the like of the adsorbent are avoided through the addition of the polyethylene oxide, and therefore the mechanical performance of the adsorbent is improved; the method for preparing the composite adsorbent provided by the invention is simple and feasible, and is conveniently popularized.

Description

technical field [0001] The invention relates to the field of adsorption refrigeration, in particular to a composite adsorbent. Background technique [0002] Adsorption refrigeration, as a green refrigeration technology driven by renewable energy or low-grade heat source, has attracted more and more attention. Compared with traditional absorption refrigeration, adsorption refrigeration not only reduces power consumption, but also avoids problems such as crystallization of working fluids and high-temperature thermal corrosion in the absorption refrigeration system during work, and is more environmentally friendly. [0003] However, there are still great difficulties in the application of adsorption refrigeration, mainly because the adsorbent has many defects, such as easy agglomeration, poor heat and mass transfer performance, and poor mechanical properties. Chinese patent CN1613551 discloses a calcium chloride-expanded graphite mixed adsorbent. In this patent, expanded graph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30
Inventor 叶宏李世民袁智
Owner UNIV OF SCI & TECH OF CHINA
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