Method for preparing chemosorption material

FIELD: chemical technology.

SUBSTANCE: invention relates to technology for preparing chemosorption materials possessing high protective properties with respect to ammonia vapors that can be used for using in filtering protective devices. Method involves impregnation of nonwoven activated fabric made of hydrocellulose fibers in an aqueous solution containing zinc chloride and nickel chloride. Also, this solution contains 1,2,3-propanetriol (glycerol) as a modifying agent taken in the amount 0.5-1.0% of the total amount of the prepared solution.

EFFECT: improved preparing method.

1 tbl, 1 ex

 

The invention relates to a technology for chemisorption materials and can be used in the chemical industry, namely in the production of materials used in filtration devices remedies, technical devices of environmental engineering.

Known adsorbing material according to patent US 429410 (publ. 27.10.81)containing non-woven material coated on its surface a layer of a powder material. The fixing of the particles of the adsorbent is performed using thermoplastic polyolefin fibers contained in the nonwoven material due to their slight melting when heated.

The disadvantage of this absorbent material obtained by the method described in the description of the patent US 429410 is its rigidity, when the technological processing of this material sorbent partially is painted, which creates certain difficulties in the design of means of individual protection of respiratory organs.

A method of obtaining chemisorption material, which consists in the processing of the carboxyl-containing chemical sorbent in the Na-form first of 0.5-1.0%acid solution with a ratio of mass chemisorption material to the volume of the acid solution is 1:30, for 0.5-1.0 HR for translation in H-form, and then of 0.5-1.0%solution of potassium hydroxide with the same ratio of components in the tech is the same time for the conversion of chemical sorbent in the form of flushing softened water after each stage.

The disadvantage of chemisorption material obtained by this method is the low reactivity of the ammonia.

A method of obtaining chemisorption material VION an-1, described in the book Mpora "Chemisorptive fiber", Moscow, Chemistry, 1981, str-131, 181, including hydrazidine polyacrylonitrile fibers. The fiber obtained in this way in the protonated form, is used for chemisorption of ammonia, but the fibers obtained by this method cannot be used in filtration devices remedies, including for the manufacture of filter products in a certain form.

The invention solves the problem of creating workable way of getting chemisorption materials intended for use in a filtering device protection, technical devices of environmental engineering.

To achieve the technical result in the production method of chemisorption material for absorption of ammonia vapors, consisting in impregnating a non-woven absorbent fibers, followed by drying of the material, produce impregnation of non-woven activated paintings from hydrocellulose fibers, which is carried out in aqueous solution mixtures of zinc chloride and Nickel chloride in the following ratio of components:

Zinc chloride - 75-10 leaky cable,0 wt.%

Chloride Nickel - 8.0 to 12.0 wt.%, and in a salt solution is injected modifier 1,2,3-propanetriol (glycerol) in an amount of 0.5-1.0% of the total amount of the prepared solution.

Distinctive features of the proposed method from the specified visiitng closest to him, is what produces the impregnation of non-woven activated paintings from hydrocellulose fibers, which is carried out in aqueous solution mixtures of zinc chloride and Nickel chloride in the following ratio of components:

Zinc chloride - 7.5 to 10.0 wt.%

Chloride Nickel - 8.0 to 12.0 wt.%, and in a salt solution is injected modifier 1,2,3-propantriol in quantities of 0.5-1.0% of the total amount of the prepared solution.

Due to the presence of these characteristics, the proposed method obtained chemisorption material with high barrier properties for pairs of ammonia, this material has a high elastic properties, which is necessary for the production of materials used in filtration devices remedies.

Example. As the basis is taken activated nonwoven material with a surface density of 170 g/cm3and total porosity 1.6 cm3/year

For impregnation of the material prepared aqueous solution of ZnCl salts2(8.5%) and NiCl2(8,5%), dissolve 8.5 g ZnCl2and 8.5 g NiCl2in 83 ml of water at a temperature of 60° C. Then, the prepared solution contribute 0.5 ml of glycerol (modifier 1,2,3-propantriol). The solution is thoroughly mixed, and then immerse the workpiece material. The material is kept in an impregnating solution for 20 min, then removed from solution and allowed to Mature on the mesh substrate for 40-60 min, and then placed in a drying chamber and dried with heated air at a temperature of 70-90°C for 1.5 to 2.0 hours.

Received chemisorption material have pairs of ammonia under the following dynamic conditions: initial concentration of ammonia 0.2 mg/l (10 MPC), the volumetric rate of 30 l/min, the relative humidity of the gas flow is 50%, the temperature of 18-22°C. the working surface of the material is 180 cm2. Under these conditions, the control time of the protective action must not be less than 30 minutes

The resulting material had the time of protective action 58±2 min of 4 tests.

The table presents the test results of different variants of the material obtained by the claimed method. Time of protective action for NH3(min) under the above conditions.

td align="center"> 8,0/10,0
Material typeThe ratio of the components ZnCl2/NiCl2the solution in water
7,5/8,07,5/12,010,0/12,0
1. Material with a density of 200 g/m3and vΣ=1.2 cm3/g, 0.5% glycerol30±248±250±260±2
2. Material with a density of 150 g/m3and vΣ=1.8 cm3/g; 1.0% glycerol32±256±262±278±2

Time of protective action is given the average of 4 trials each. In this case, all the materials had good elasticity and can be applied in products of various designs. When the mixing ratio of zinc chloride less than 7.5 wt.% and of Nickel chloride less than 8.0 wt.% time of protective action of the material is less than 25 minutes, which is insufficient for effective protection. When the mixing ratio of zinc chloride over 10 wt.% and of Nickel chloride greater than 12.0 wt.% the material loses its elasticity is good and constructive.

The proposed method obtained chemisorption material with high barrier properties for pairs of ammonia and high elastic properties, which is necessary for the production of materials used in filtration devices remedies.

The method of obtaining chemisorption material for absorption of ammonia vapors, consisting in impregnating there is anago activated fibers, followed by drying of the material, characterized in that produce impregnation of non-woven activated paintings from hydrocellulose fibers, which is carried out in aqueous solution mixtures of zinc chloride and Nickel chloride in the following ratio, wt.%:

Zinc chloride7,5-10,0
Chloride Nickel8,0-12,0,

and in a salt solution is injected modifier 1,2,3-propantriol in quantities of 0.5-1.0% of the total amount of the prepared solution.



 

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