Sorption of hydrogen fluoride by the chemisorptive fibres VION AN-1 and VION AN-3

Conclusions -- It has been found that to remove hydrogen fluoride from a gas-air mixture at a concentration down to 15 mg/m³, one should use the chemisorptive fibrous sorbents VION AN-1 or VION AN-3; this ensures a high degree of clean-up down to a concentration considerably lower than the limiting allowable one in the workplace.-- In the sorption of hydrogen fluoride from a gas-air mixture, it is recommended to use the KHVF filter instead of scrubber purification; this ensures high technical-economic indices for the process.Translated from Khimicheskie Volokna, No. 5, pp. 22–24, September–October, 1990.     

Optimization of the preparation of VION chemisorptive fibre containing carboxyl groups

Conclusions The sorptive properties of VION fibre with carboxyl groups have been studied. It has been shown that at an SEC over 3.5 meq/g no corresponding increase in degree of absorption of ammonia by the fibrous sorbent takes place.Optimization of the conditions for preparing the weak acid VION fibre at an assigned SEC selected from the results of sorption measurements has been carried out.Translated from Khimicheskie Volokna, No. 2, pp. 7–8, March–April, 1989.     

Mass-transfer processes in sorption of gases by VION AN-1 and VION AS-1 fibres

Conclusions Coefficients of internal diffusion and of mass-transfer have been measured in the sorption of hydrogen chloride, nitrogen dioxide, and iodine by weakly basic and strongly basic chemisorptive fibres.A large effect of moisture content and basicity of the chemisorptive fibres on mass-transfer processes in the sorption of gases has been demonstrated.Translated from Khimicheskie Volokna, No. 6, pp. 9–10, November–December, 1988.     

Preparation of a chemisorptive sulfonate fibre and its properties

Conclusions Conditions have been developed for preparation of a chemisorptive fibre containing sulfonate groups from an acrylonitrile-sodium methallylsulfonate copolymer which processes satisfactorily into textile articles.During the process of orientation stretch of the fibre prepared, strengthening takes place as a result of orientation of the acrylonitrile component.Translated from Khimicheskie Volokna, No. 4, pp. 8–9, July–August, 1988.     

Sorption of copper cations by vion KN-1 chemisorptive fibre

Conclusions 1. Quantitative characteristics of the sorption process of copper cations from aqueous solutions by the chemisorptive fibre vion KN-1 in the sodium form have been determined.2. The sorptive capacity of the fibre under static and dynamic conditions in absorption from aqueous solutions containing a mixture of copper, lead, and manganese ions has been determined.Scientific Research Institute of Physics, Odessa State University. Translated from Khimicheskie Volokna, No. 5, pp. 27–28, September–October, 1993.     

Spinning of a chemisorptive sulfonic acid fibre

Conclusions Special features of spinning a fibre by the wet method from a copolymer based on acrylonitrile and sodium methallylsulfonate which are connected with dissociation and solvation of the sulfonate groups have been examined.It has been found that, to obtain a fibre with satisfactory physico-mechanical properties which assure processing into textile articles from a sulfonate-containing copolymer, it is necessary to carry out the spinning either into nonaqueous baths or into aqueous baths which contain lyophilic salts.Translated from Khimicheskie Volokna, No. 3, pp. 10–12, May–June, 1988.     

Operating conditions for sulfonic acid chemisorptive fibre

Conclusions Data have been presented on the thermal and chemical stability of VION KS-3 sulfonic acid fibre.The following optimum service conditions have been found for this fibre: temperature not over 100°C; regeneration with 5% sulfuric acid solution at a temperature not over 50°C; alkaline treatment with dilute solutions (up to 2% by wt.) at room temperature; it is not possible to treat the fibre with concentrated nitric acid solutions; duration of the action of oxidants not over 48 h.Translated from Khimicheskie Volokna, No. 3, pp. 30–32, May–June, 1986.     

Thermokinetics of sorption of Zn(II) by VION KN-1 carboxyl-containing fibre

The thermokinetics was investigated and the enthalpy of sorption of Zn(II) ions from solutions of different concentration with VION KN-1 carboxyl chemisorption fibres (Na form) was determined. It was found that the time of attaining sorption equilibrium and the value of ΔH of sorption of Zn(II) ions is a function of their concentration in the solution. The results obtained can be used to determine the energy consumed in sorption of Zn(II) and effectively using KN-1 fibre in treatment of aqueous and gas-air media to remove heavy metal ions. __________ Translated from Khimicheskie Volokna, No. 2, pp. 59–61, March–April, 2006.     

Dynamics of the sorption of hydrogen chloride and ammonia on the carboxyl group-containing fibre VION KN-1

Conclusions Using a dynamic assembly of the Mikrogaz type for the preparation of gas mixtures of known composition, the sorption of hydrogen chloride and of ammonia has been studied in the concentration range from 0.5 to 1000 mg/m³, under dynamic conditions on the nonwoven chemisorptive fibrous material VION, type KN-1. Regimes for the desorption of these materials and regeneration of the sorbent have been selected.The possibility of fine clean-up of gas discharges of hydrogen chloride and of ammonia on VION KN-1 has been demonstrated, plus the conditions for effecting it, as well as the possibility of using this material for mean shift and mean daily quantitative air sampling.Translated from Khimicheskie Volokna, No. 6, pp. 48–50, November–December, 1987.     

Fabrication of VION chemisorption fibre in concentrated solutions of hydrazine hydrate

The mechanism of the reaction of hydrazidation of Nitron fibre in aqueous and alcohol solutions of hydrazine hydrate in the 10–75 wt. % concentration range was investigated. The conditions for fabrication of an anion-exchange fibre with a static exchange capacity (SEC) of up to 3 meq/g by successive treatment of Nitron fibre with solutions of hydrazine hydrate with a concentration of 10 to 50% were developed. The chemisorption fibres obtained have satisfactory mechanical properties and satisfy the requirements set for them in textile processing.Military Academy for Chemical Defense, All-Russian Scientific-Research Institute of Polymer Fibres, Mytishchi. Translated from Khimicheskie Volokna, No. 2, pp. 15–17, March–April, 1995.     

Some peculiarities of the copolymer precipitation in spinning a strongly-acid chemisorptive fibre

Conclusions The existence of polyelectrolyte swelling (self-elongation of the fibre on change of medium) has been established in strongly acid undrawn gel-fibre.It has been shown that cementing of the strongly-acid fibre after drying, when the fibre has been wet-spun into aqueous-organic baths, is caused by the presence of solvent which is strongly retained on the fibre.A possible mechanism for the retention of solvent by the strongly-acid gel-fibre has been advanced.Translated from Khimicheskie Volokna, No. 4, pp. 32–34, July–August, 1987.     

Pilot plant realization of a process for preparing a chemisorptive polyamide fibre

Conclusions A technological process for the preparation of the chemisorptive polyamide fibre KM-Al, which is based on a graft copolymer of polycaproamide and poly(dimethylaminoethyl methacrylate) has been developed and realized on a pilot plant assembly of the Volzhskii Khimvolokno PO.Sorption-filtering materials from KM-Al fibre can be used in installations for the sanitary purification of gases and in universal media for individual protection of breathing organs — respirators.Translated from Khimicheskoe Volokna, No. 6, pp. 35–36, November–December, 1986.     

Synthesis of a copolymer of acrylonitrile with sodium methallylsulfonate in dimethyl sulfoxide and the preparation of a chemisorptive fibre based on it

Conclusions Conditions have been developed for the synthesis of a copolymer of acrylonitrile and sodium methallylsulfonate in dimethyl sulfoxide containing up to 2–1/2% water by wt., using a redox initiating system.Fibres spun from the indicated copolymer have satisfactory physico-mechanical properties, and their static exchange capacity is as much as 1.1 meq/g.Translated from Khimicheskie Volokna, No. 4, pp. 16–18, July–August, 1990.     

Sorption of hydrogen sulfide by VION anion-exchange fibres

Conclusions The effect of the basicity of the chemically active groups in chemisorptive fibres on their sorptive properties with respect to hydrogen sulfide has been demonstrated.In the regeneration of fibrous sorbents with alkali solutions, it is advisable to use weakly basic fibrous sorbents for the absorption of hydrogen sulfide.Translated from Khimicheskie Volokna, No. 6, pp. 10–11, November–December, 1988.     

Direction of work in the area of preparing chemisorptive fibres

Conclusions -- Basic trends in the preparation of chemisorptive fibrous materials intended for protecting the environment or trapping out valuable substances have been examined. -- The properties of chemisorptive fibres have been compared as a function of the conditions for preparing them. Translated from Khimicheskie Volokna, No. 2, pp. 41–45, March–April, 1991.     

A study of the properties of Oksalon fibre

Conclusions The use of one of the methods of mathematical statistics has made it possible not only to obtain a theoretical formula for the distribution of fibre length in a yarn and to find the connection between the theoretical distribution law and the practical results, but has afforded the possibility of predicting the properties of the final product — the yarn.Fibre processing has confirmed the assumptions stated above on the satisfactory ability of Oksalon fibre to be processed into a high-quality yarn.Translated from Khimicheskie Volokna, No. 5, pp. 37–38, September–October, 1984.     

Effect of UHF modification on the properties of fibre fillers and cation-exchange fibre materials

The expediency of modifying polypropylene and basalt fibres to increase the SEC of cation-exchange fibre materials (CEFM) made from them due to increasing the activity of the UHF-treated fibres was demonstrated. __________ Translated from Khimicheskie Volokna, No. 1, pp. 54–56, January–February, 2008.