Liquid purification or separation – Processes – Separating
Patent
1990-11-09
1993-02-02
Dawson, Robert A.
Liquid purification or separation
Processes
Separating
210767, 210511, 100145, 127 5, 127 7, 162 18, B01D 1102
Patent
active
051835789
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention concerns a process for the extraction or flushing out of a substance from a heterogenous system and to a continuously operating extraction or flushing installation for carrying out the process.
STATE OF THE ART
In the chemical industry the treatment of heterogenous systems, regardless of whether it is a question of physical separations, extractions, flushing processes, chemical reactions or similar, is either carried out discontinuously or in stages in different devices, or, on the other hand, continuously or uninterrupted in a single device intended therefor. In comparison with the continuous processes, the stagewise processes usually have various disadvantages such as longer processing time, greater energy consumption, smaller specific output and procedures which are difficult to automate.
A device for the continuous treatment of heterogenous systems, in particular for extracting substances from a solid phase of granular material by means of a solvent, has for example become known of as a screw-type extractor by Hildebrand (Lueger, Lexikon der Technik, Volume 16, 1970 Deutsche Verlags-Anstalt Stuttgart). The extractor contains three conveyor screws turning at different speeds, in a U-shaped arrangement. The material is advanced downwards by the first screw, horizontally by the second and upwards again by the third. The solvent flows in the opposite direction. The second, horizontally disposed screw turns slower than the other screws so that the solid phase is accumulated.
Observations made whilst working with the above-mentioned extractor show that it would be desirable to construct installations for carrying out extraction or flushing out processes in a way which would achieve a greater purity of the solid phase left over from the extracted substance and better utilization of the solvent used for the extraction, and which would also enable extraction or flushing out of a solid phase consisting of a fibrous material. By better utilization, it is meant that the solvent, which, during the course of the process, forms a liquid phase which becomes increasingly loaded with the substance to be extracted, is capable of being more heavily loaded with the substance than is usual in the known extractor.
DISCLOSURE OF THE INVENTION
It is therefore the object of this invention to propose a process and an installation for carrying out the process, in which process or installation the above-mentioned desirable improvements are included. It is apparent that in doing so, there will be additional advantages such as, for example, cost savings due to lower solvent consumption or due to a shortened process time for achieving a certain degree of purity of the solid phase. The proposed installation should not only be suitable for the extraction of substances from a solid phase, such as granular or fibrous material, but should also be equally suitable for flushing or washing out the solid phase of a heterogenous system.
This object is solved with the process comprising the following steps: one conveyor pipe in which conveyor means are disposed at one end of the conveyor pipe; course of the process, forms a liquid phase which becomes increasingly charged with the substance to be extracted or flushed out; conveyor pipe while traversing the liquid phase through the conveyor pipe in a direction opposite to the solid phase; phase passes through the conveyor pipe; be extracted or flushed out than the liquid phase drawn off near the compaction zone; comprising: means is disposed, and a sloping pipe adjoining the conveyor pipe; or granular materia; device being disposed near an end portion of the conveyor pipe, the device for supplying the solid phase being disposed at the other end of the conveyor pipe; conveyor pipe along the path of the solid phase, the compression zone; and,
The effectiveness of the process and the installation for carrying out the process is based on the fact that compression or crush zones, decompression or expansion zones and mix zones follow alternately and continuo
REFERENCES:
patent: 623892 (1899-04-01), Fairley
patent: 1604650 (1924-11-01), Manning
patent: 1604651 (1925-04-01), Manning
patent: 2637666 (1950-01-01), Langen
patent: 2928760 (1954-12-01), Christoffersen et al.
patent: 3313653 (1964-10-01), Jung
patent: 3523799 (1966-11-01), Rigby
patent: 3953224 (1976-04-01), Dietzel et al.
Dawson Robert A.
Fortuna Ana M.
Laycock SA
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