Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With agitation or forced circulation
Patent
1997-07-16
1999-08-03
Silverman, Stanley S.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With agitation or forced circulation
162 58, 162 52, 422185, 422232, D21C 706
Patent
active
059320672
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL SECTION
The current invention is concerned with the processing of fibrous substance by the use of a chemical agent and set up required which can be engaged in paper and pulp industry as well as bleach use.
PRELIMINARY LEVEL OF TECHNOLOGY
Presently, processing of fiber, as well as paper and pulp fiber, is fulfilled by the use of chemical agents with variety of methods. Some processes, like chlorine bleaching in the presence of suspended substrate (USSR Patent No 282053, 1970), chlorinating of paper and pulp fiber in the adsorption column (USSR Patent No 209964, 1968) or some methods of fiber bleaching, carried out with such gaseous agents as ozone, oxygen and chlorine in the column reactor (USSR Patent, No 365411, 1973), are well known. Some methods of fiber treating with gaseous agents with the use of certain devices, provided with a cycling transfer tape for maintenance of a proper mass stratum (USSR Patent No 544724, 1977), are also known.
Nonetheless, all the methods reviewed are characterized by insufficient mass transfer in the reaction zone, furthermore, agent utilization constant and quality of the product are considered to be low. Chemical agents, engaged in these processes, do not allow to conduct the processing of highly concentrated fibrous mass and require a large amount of metal for equipment and complexity of service in use.
The closest method to the needed one is a method of fiber processing through the agency of treating with a gaseous agent in the flow reactor, which beats all the faults revised above (Russian Federation Patent No 903419, 993). This one can be used in the process of pulp and paper bleaching by a gaseous agent. Thus, fiber concentration over 15 percent, calculated from the dry substrate, can be achieved in the portions, transferred throughout the load cell to the mixing cell with the gaseous agent, followed by transfer of the reaction mixture to the stream cell, connected to the cell for accumulation of processed fiber. The main fault of the current method is that the mass transfer in the reaction zone is insufficient and there is no uniform distribution of the reagent mass in the volume. Therefore, low agent utilization constant occurs, and no proper quality of processed fiber can be attained (the estimated level of bleaching is no more than 55 percent).
This invention is directed towards the high quality methods of fiber processing with a chemical agent which contributes uniform processing of material in the whole volume of the reaction mass, decreasing of agent consumption, high quality of processed fiber (in particular, increasing of bleaching level of the pulp mass), opportunity to process the fiber of high concentrations using the large number of various chemical agents, in gas or liquid conditions as well.
DESCRIPTION OF THE INVENTION
The task set is solved by the way of preliminary mixing of fiber with a gas transfer agent in the mixing cell, followed by the transfer of formed mix into the tube cell, which is spiral shaped and looped round the accumulation cell for processed fibrous mass with the 1:18-1:60 ratio between tube and loop diameters. Following this scheme, chemical agent is transferred throughout the jets, which are stretched lengthwise, and the process is conducted in a turbulent regime of the mass flow with the velocity 1-50 m/s.
The difference between this method and the known one is that the chemical agent is transferred directly to the reactor from the jets attached to its sides lengthwise and the process is conducted in a turbulent regime of flow with the velocity 1-50 m/s. The reactor, so far, is spiral shaped and looped round the cell for accumulation of processed fiber, with the 1:18-1:60 ratio between tube and loop diameters.
Conducting of fiber processing in a turbulent flow of the reaction mixture, moving throughout the cell with the velocity 1-50 m/s, promotes the appreciable intensification of mass transfer processes in the reaction zone. The turbulent regime of flow of the reaction mixture is promoted in a certain interval
REFERENCES:
patent: 5160581 (1992-11-01), Titmas
Nguyen Dean T.
Pukanov Vitaly Valerievich
Silverman Stanley S.
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