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Sorbtion-Aerosol Fiber Filters

#1916


Development of Technology of Sorbtion – Aerosols Fibrous Superfiltres Produce in Electrostatic Poles

Tech Area / Field

  • MAN-MAT/Engineering Materials/Manufacturing Technology

Status
3 Approved without Funding

Registration date
07.07.2000

Leading Institute
Karpov Institute of Physical Chemistry, Russia, Moscow

Supporting institutes

  • Kurchatov Research Center, Russia, Moscow

Collaborators

  • Kwangju Institute of Science and Technology, Korea, Kwangju\nUniversity of California, USA, CA, Los-Angeles

Project summary

The purpose of the project is the development of a new filtering and sorptional filtering medium from ultrafine fibres for cleaning of air and gases in an industry, for manufacture of breathing masks and for the scientific purposes, and development of theoretical bases of their production and application

The filters from polymeric fibres have found wide application in modern technology, in medicine, for the analysis of aerosols, as breathing apparatus, etc. The filters are produced by dispergation of solutions and melts of polymeric compounds, and as the much as thin homogeneous layers from hyperfine fibres can be produced only by electrohydrodynamic method. An electrohydrodynamic method of production of filter layers is rather adaptable: there is an opportunity to control thickness of fibres during their spinning, to immix fibres of a different diameter, it is possible to vary density of packing of materials etc. And the opportunity of use of various polymetric compounds as a feed stock, including with the various additives of chemisorbents or antiseptics will ensure to these filters wide application.

Besides the obtained filtering media from polymeric ultra fine fibres are intermediate for obtaining sorptional filters: after carbonization or graphitization of fibres the homogeneous structure proper in the initial filter, as have shown prior experiments, is maintained.The preliminary estimations show, that the new fibrous filtering media will have the greater quantity «quality criterion», which is defined as ratio of the logarithm of the particle penetration to the pressure drop in a filter, in comparison with other filters. By the literary data and fair brochures of the manufacturing firms, there are no analogs to these filters in the world.Purposes of these materials are very wide. They will be utilised first of all for breathing masks and analytical purposes, at presence in air of molecular impurities, such as for example radioactive iod, and also for a finishing stage of cleaning of air and gases in high technologies.

The electrohydrodynamic method of producing of filtering media was carefully designed in laboratory and is constantly perfected in connection with large-scale discharge by this method of polymeric filters with the trade mark FP (filters of Petrianov). Therefore this project of producing of filters from hyperfine fibres is the logic prolongation of scientific-practical activity of author's collective. Besides ability of realization of the given project is based on the theoretical achievements of authors in the field of fine cleaning of gases from airborne particles. The theory of the filtration of nanoaerosols and molecular contaminations is the recent trend of superclearing of air for new technologies, especially for a microelectronics, successfully developed in the institutes - the participants of this project.

The given project is based on the various categories of development concerning to fundamental and applied investigations. As a result of realization of the project the theory and technology of producing of fine fibres (diameter less than 0,5 microns) by electrohydrodynamic method will be designed. The theory of optimization of interior structure of filtering media, and the samples of the new fibrous media, including fine homogeneous structural filtering media from monodisperse fibers and compositions of fibers with various diameter, will be produced. The technology of production of sorptional fibres, as well as sample of composite filter media, will be developed. The theory of gas cleaning ftom aerosol and molecular impurities by new filters will be designed, and also the problems, bound with a corrugation of a filtering material and a kinetics of clogging of filters will be solved. The experimental examination of filtering and sorptional properties of new materials, including radioactive iodine sorption tests is planed.The applied examinations will allow to create industrial production technology of filters.

The results of applied examinations on new filtering media should have wide application in all fields touching cleaning of air and gases in an industry, in medicine, for the scientific purposes and at protection of organs of breath. The new filtering media are necessary first of all for manufacture of breathing masks with small resistance to a stream, are necessary for the analytical purposes at measuring the content of aerosol and molecular component contaminations of an atmosphere and for supercleaning air for production of products of a microelectronics and medicinal drugs etc..

In fulfilment of planned job participate a number(line) of the experts, before taking part in jobs on military subjects. The job on development of technology and creation of new filtering materials including fundamental both applied research in the field of hydrodynamics and physical chemistry, is directed, first of all, on the decision of national and international technical problems of environmental protection and increase of safety of nuclear-power installations. The occurrence of new production (filters and breath masks, having by sorption properties and small hydrodynamical resistance) will support transition to market economy adequate civil needs. Thus, the offered project completely answers realization of all purposes and problems ISTC.

According to volume of activity within the framework of the offered project the information interchange with foreign collaborators and granting to them of the technical reports and samples of filtering materials is supposed. It is planned to offer to them cross check of results received at realization of the project, visiting of laboratories, realization of joint working seminars.

The questions of development of technology of producing of filtering materials are decided experimentally and theoretically on the basis of a method of electrohydrodynamical dispersion of solutions of polymers in a constant electrical field. Sorptional materials will be received by methods of carbonisation of polymeric fibres and direct introduction of chemical sorption in solutions of various polymers. The questions of physics and technique of clearing of gases are decided experimentally and theoretically with the help of modeling of process of a filtration. Tests of samples of new filtering materials and filters will be carried out with the help of modelling aerosols and vapours of iodine and in real conditions on the acting research nuclear reactor.


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