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Desiccant mass, method for obtaining same and use thereof

A desiccant and fiber technology, applied in the direction of separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of limited water absorption capacity and limited absorption capacity, and achieve the effect of large contact area

Inactive Publication Date: 2010-11-24
SOLVAY SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, their ability to absorb water is limited, especially that of calcium chloride

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] With calcium compounds complying with the above specification, the desiccant is made from the following materials:

[0040] -69% calcium compounds;

[0041] - 23% of fibers from recycled pulp (specific area = 13m 2 / g);

[0042] -8% CaCl 2 ;

[0043] - Theoretical water absorption of the desiccant: 75% under controlled atmosphere according to the following conditions:

[0044] - Temperature: 23°C;

[0045] - relative humidity: 90%;

[0046] - CaCl in aqueous solution in thermodynamic equilibrium with the ambient atmosphere 2 The maximum concentration: 120g / kg solution;

[0047] -10g sample is placed in an open crucible,

[0048] Get some of the following properties:

[0049] - % of water absorption at equilibrium after 168 hours: 73%;

[0050] - no seepage from the desiccant was detected;

[0051] - CaCl in solution in desiccant 2 Concentration: 120g / kg.

Embodiment 2

[0053] With calcium compounds complying with the above specification, the desiccant is made from the following materials:

[0054] -68% calcium compounds;

[0055] - 23% of fibers from recycled pulp (specific area = 13m 2 / g);

[0056] -9% CaCl 2 ;

[0057] - Theoretical water absorption of the desiccant: 74% under controlled atmosphere according to the following conditions:

[0058] - Temperature: 23°C;

[0059] - relative humidity: 90%;

[0060] - CaCl in aqueous solution in thermodynamic equilibrium with the ambient atmosphere 2 The maximum concentration: 120g / kg solution;

[0061] -10g sample is placed in an open crucible,

[0062] Get some of the following properties:

[0063] - % water absorption at equilibrium after 197 hours: 78%;

[0064] - Detectable water penetration of absorbent after 192 hours is % of equilibrium absorbed water: 77%;

[0065] - CaCl in solution in desiccant at the end of the test 2 Concentration: 120g / kg.

Embodiment 3

[0067] With calcium compounds complying with the above specification, the desiccant is made from the following materials:

[0068] -60% calcium compounds;

[0069] - 20% of fibers from recycled pulp (specific area = 13m 2 / g);

[0070] -20% CaCl 2 ;

[0071] - Theoretical water absorption of the desiccant: 58% under controlled atmosphere according to the following conditions:

[0072] - Temperature: 23°C;

[0073] - relative humidity: 90%;

[0074] - CaCl in aqueous solution in thermodynamic equilibrium with the ambient atmosphere 2 The maximum concentration: 120g / kg solution;

[0075] -10g sample is placed in an open crucible,

[0076] Get some of the following properties:

[0077] - % of water uptake at equilibrium after 6 hours: 46%;

[0078] - Detectable water penetration of absorbent after 168 hours is % of equilibrium absorbed water: 208%

[0079] - CaCl in solution in desiccant at the end of the test 2 Concentration: 120g / kg.

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Abstract

The invention concerns a desiccant mass comprising a mixture of loose fibers and at least an alkali or an alkaline-earth metal halide and optionally at least a calcic compound different from the alkali or alkaline-earth metal halide. The invention also concerns a method for making such a desiccant mass, which consists in mixing the loose fibers with at least an alkali or alkaline-earth metal halide and, optionally, with at least a calcic compound, in the presence of sufficient amount of water to obtain an extrusible mass, then in extruding said extrusible mass and in drying the extruded mass. The invention further concerns the use of said desiccant mass in particular for dehydrating and controlling moisture.

Description

[0001] The application date is October 16, 2002 (the international application number is PCT / EP02 / 11602), the application number for entering the national stage is 02820634.7, and the invention title is "desiccant, method for obtaining desiccant and its application" divisional application. technical field [0002] The present invention relates to desiccants based on one or more halides of alkali metals or alkaline earth metals, in particular calcium chloride, especially for absorbing water vapour. Background technique [0003] As desiccants, alkali metal or alkaline earth metal halides, such as lithium chloride and calcium chloride, have been known. However, their ability to absorb water, especially calcium chloride, is limited. Because, the commonly used calcium chloride is dihydrated form (CaCl 2 .2H 2 O), after the calcium chloride absorbs water, it becomes CaCl dissolved in its crystallization water 2 .6H 2 O, resulting in a solution. This solution usually flows to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/28B01J20/04B01J20/28
CPCB01J20/04B01D53/28B01J20/28023B01J20/28042B01J20/043B01J20/045B01J20/046B01J20/24B01J20/3007B01J2220/46B01J2220/4831
Inventor J·-M·布隆代尔
Owner SOLVAY SA
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