DE2218699A1 - MULTI-STAGE STANDING COUNTER-CURRENT EXTRACTOR - Google Patents

Description

Metallgesellschaft % Frankfurt aM, April 13th, 1972

Corporation

Frakfurt a.Main Dr.Ia / HWi

Reuterweg 14

prov.No. 6 8 5 6 DEL

Multi-stage standing counterflow extractor>

The invention "relates to a multi-stage standing countercurrent extractor according to the mixer-separator principle, in which in each stage a part of the 'light or the heavy phase in the circuit through the mixer and the separator can v / ground and a process for Extraction of liquid mixtures with the help of this extractor.

There are multi-stage standing countercurrent extractors "known, "where the individual steps are disc-shaped * · and are arranged one above the other. Jqde level consists of a mixing chamber, a separation chamber and a feed pump. (DT-PS 1 080 522, DT-PS 1 207 969).

Such, working according to the mixer-separator system ■ " Extractors are preferably operated in such a way that: one of the liquid phases passes through all stages in a single pass, while the other in each stage with a T ^ il flow in Cycle is maintained.

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The previously known mixer-separator-extractors have the disadvantage that they have to be designed in advance Circulation mode are bound. A transition e.g. from the cycle of the light phase to the cycle of the heavy phase Phase is only possible after the system has been shut down and the extractor has been completely rebuilt. A straight pass through both phases is completely excluded here.

The invention has set itself the task of avoiding these disadvantages and a multi-stage standing countercurrent extractor to develop, with which it is possible by opening and closing certain standard fittings of a driving style with Cycle of the light phase to a mode of operation with cycle of the heavy phase and vice versa 'or to a mode of operation without To switch the circuit with straight passage during operation. The extractor should be of simple construction and do not require any complicated internals for guiding the liquid phases and for regulation.

This task is achieved according to the invention by a multi-stage standing countercurrent extractor based on the mixer-separator principle solved, which is characterized by a nozzle (DS (n)) for feeding the phase mixture into the separation chamber (T (n)), a nozzle (LS (n)) for the derivation of the light Phase from the separation chamber (T (n)) and a nozzle (SS (n)) to divert the heavy phase through a line (RL (n)) from the nozzle (LS (n)) to the suction side of the mixing pump (P (n + 1)) and a line (RLK (n)) with shut-off and control valve (VLK (n)) to the suction side of the mixing pump (P (n)), through a line (RS (n)) from the nozzle (SS (n)) to the suction side of the mixing pump (P (n-1)) and a line (RSK (n)) with shut-off and control valve (VSK (n)) to the suction side of the mixing pump (P (n)) and

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through a line (RD (η)) from the pressure side of the mixing pump (P (n)) with the control valve (DK (n)) into the separation chamber (T (n)) over the nozzle (DS (n)).

According to a further development of the extractor is a control valve (VL (n)) in the line (RL (n)) to the suction side of the mixing pump (P (n + 1)) and a control valve (VS (n)) in the 'Line (RS (n)) to the suction side of the mixing pump (P (n-1)) arranged.

Countercurrent extraction is possible with the extractor according to the invention of liquid mixtures possible, whereby one during the operation of the extractor optionally in a separation stage, consisting of separation chamber (T (n)) and mixing pump (P (n)), Regardless of how the other separation stages are operated, one of the phases in the cycle or both phases in a single pass can lead. To guide the light phase in the cycle, open the shut-off and control valve (VLK (n)) in the Pipeline. (RLK (n)) the light phase of the mares (LS (n)) to the suction side of the mixing pump (P (n)) and closes the shut-off and control valve (VSK (n)) in the pipeline (RSK (n)). the heavy phase from the nozzle (SS (n)) to the suction side of the mixing pump (P (n)).

The shut-off and control valve (VSK (n)) in the pipeline is opened to guide the heavy phase in the circuit (RSK (n)) of the heavy phase from the connection (SS (n)) to the suction side of the mixing pump (P (n)) and closes the shut-off and control valve (VLK (n)) in the pipeline (RLK (n)) of the light phase from the nozzle (LS (n)) to the suction side of the mixing pump (P (n)).

To guide the phases in a straight pass through a Separation stage, consisting of the separation chamber (T (n)) and the mixing pump (P (n)), closes both the shut-off and Control valve (VLK (n)) in the pipeline (RLK (n)). Der

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light phase from the nozzle (LS (n)) of the separation chamber (T (n)) to the suction side of the Mis chpump ejF (P (n)) as well as the Shut-off and control valve (VSK (n)) in the pipeline (ESK (n)) of the heavy phase from the nozzle (SS (n)) of the separation chamber (T (n)) to the suction side of the mixing pump (P (n)).

According to the invention, to lower the level of the phase separation mirror in the separation chamber (T (n)), the shut-off and control valve (VLK (n-1)) in the pipeline (RLK (nl)) of the light phase from the nozzle (LS (n- 1)) to the suction side of the mixing pump (P (n-1)), while to raise the level of the phase separation level in the separation chamber (T (n)) n is the shut-off and regulating valve (YSK (+ 1)) in the pipeline ( RSK (n + 1)) throttles the heavy phase from the nozzle (SS (n + 1)) to the suction side of the mixing pump (P (n + 1)).

According to the invention, in the light phase cycle, the level of the phase separation mirror is adjusted in the separation chamber (T (n)) the control valves (VS (n)) in the pipeline (RS (n)) of the heavy phase to the suction side the mixing pump (P (n-1)) and / or the control valve (VL (n-1)) in the pipeline (RL (n-1)) of the light phase to the suction side of the mixing pump (P (n)), with the control fittings to lower the level of the phase separation mirror (VL (n)) and YS (n-1)) are throttled and to raise the Levels the control valves (VL (n)) and (VS (n-1)) are opened further.

In the heavy phase cycle, adjust the level of the phase separation mirror in the separation chamber (T (n)) the control valves (VL (n)) in the pipeline (RL (n)) of the light phase to the suction side of the mixing pump (P (n + 1)) and / or the control valve (VS (n + 1)) in the pipeline (RS (n + 1)) of the heavy phase to the suction side of the mixing pump (P (n)), where to lower the level of the phase separation mirror

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is throttled, the control valve (V L (η)) and / or (VS (η + ΐ)) and further geöffet for raising the level ..

If you want to operate with a straight passage of the two phases, adjust the control valve '(Ύΐΰ (ΐι)) in the pipeline (RL (n)) to the mixing pump to set the level of the phase separation mirror in the separation chamber (T (n)) (P (n + 1)) or the control valve (VS (n)) in the pipeline (RS (n)) to the mixing pump (P (n-1)), whereby the control valve (VS (n)) is used to lower the level further opened and / or the control valve (VL (n)) throttled and to raise the level (VL (n)) further opened and / or '(VS (n)) throttled. .

The invention is shown schematically and for example in FIGS Drawings and is shown in the following exemplary embodiments described in more detail.

Figures 1 and 2 show a vertical section through three stages of the mixer-separator-extractor according to the invention with externally laid pipelines including the required fittings. To step (n) is the separation chamber T (n), the mixing pump (P (n) v and the piping connections shown. For the circuits of the leads RLK (serve n), and RSK (n). For the Weiterfiüirung the phases serve lines RL (n) and Es (n) with the preferably used for regulating valves V £ (n) and V (a). 'the separation chamber T (n) can have any internals comprise the phase mixture to accelerate the separation * Xn the laid outside Pipelines can be installed easily and clearly at all important points, inspection glasses and sampling points.

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Example 1 _: .-

This example "describes the driving cycle of the light phase in stage T (n). This can optionally be done in several or in all stages of the extractor, including during of operation can be discontinued.

At level T (n) and analogously in all synchronized Steps are proceeded as follows:

The VSK (n) valve in the RSK (n) line remains closed. The valves are opened: VLK (n) in the line RLK (n), VS (n) in line RS (n), VL (n) in line RL (n).

If the level of the difficult phase in stage T (n) is too high, the valves VLK (n) in line RLK (n) are throttled and VS (n) and / or VL (n-1) in aen lines RS (n) and / or RL (n-1) open further.

If the level of the difficult phase in stage T (n) is too low, the valves VLK (n) in the Line RLK (n) further open and VS (n) and / or VL (n-1) in lines RS (n) and / or RL (n-1) throttled.

ι The phase ratio and the total amount of dispersion will be set with the throttle valve DK (n) in the pump pressure line RD (n).

When setting the separating level, the total throughput and the phase ratio in the extractor stage are preferably proceeded so that the valves VLK (n) in the circulation line RLK (n) and VL (n) in the Overflow line RL (n) remain fully open. Is regulated only the continuous (here the difficult) phase with the

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Fitting VS (η) in the Lei-fcfpig RS (n) i 'iun the separating mirror in stage T (n) and the fitting DK (n) in the pump pressure line RD (η) around the phase ratio and the total throughput to be set in level T (n).

In the driving style, the heavy phase becomes cyclical in stage T (n) the valve YLK (n) in the pipeline RLK (n) closed.

The other manipulations are analogous to the example for the cycle of the light phase, but of course transformed for the new Pail.

Example 2

This example describes the operation without cycles, i.e. pure countercurrent in stage T (n) or in several or in all stages of the extractor.

In all of these stages one proceeds as shown for stage T (n):

The fittings VLK (n) and RSK (n) in the lines RLK (n) and RSK (n) remain closed. ^

The fittings VL (n) and VS (n) in the lines RL (n) and RS (n) are open. The phase relationship in the stage is given by the amounts of the light and heavy phase. The throttle valve DK (n) in the pump pressure line RD (n) is set to an amount corresponding to the sum of the two continuous phases.

If the heavy phase in stage T (n) is too high, valve VS (n) must be opened further and valve YL (n) throttled. If the situation is reversed,

regulated in the opposite direction than just described.

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The advantages achieved with the invention exist in particular in that it is now possible to get through with a new multi-stage upright mixer-separator-extractor simple opening and closing of shut-off valves from one mode of operation with a cycle of the light phase to one mode of operation with cycle of the heavy phase or a driving style without cycle with straight passage during the current one To switch operation, with one of these three different modes of operation in each stage, regardless of the other levels, can be set. At the same time it is possible with the construction according to the invention to adjust the height of the separating layer independently in each chamber by throttling only one of the shut-off valves provided at the respective stage to regulate. Another advantage is the elimination of internals in the separation chamber for guiding the phases and to regulate the phase entreniis chicht, thereby confusing Flow conditions and costly constructions can be avoided. The one instead of the previous one customary fittings for use can be used in the normal commercial version, for which the fluidic parameters are known or easy to determine.

The functioning of any internals to accelerate the separation of the phase mixture in the separation chambers is not impaired by the new construction, but on the contrary, space is gained to enlarge these internals.

With the ability to set the mode of operation of each individual stage independently of the other stages, the The optimal mode of operation can be selected in each case in the ratios given in the individual stages, e.g. the phase ratio can always be selected can be selected in which the shortest separation time of the mixed phase results. With the previously common designs, once chosen. Driving style with circuit either the

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light or heavy phase not .. on the cycle of the other phase during operation, for this a conversion was necessary during standstill.

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Claims (1)

Patent claims ^: · ' 1) multi-level? standing counterflow extractor according to the mixer-separator principle, in which part of the light or heavy phase can be circulated through the mixer and the separator in each stage, characterized by a nozzle (i) S (n) ) for feeding the phase mixture into the separating chamber (T (n)), a nozzle (IS (n)) for discharging the light phase from the separating chamber (ö? (n)) and a nozzle (SS (n)) for discharging the heavy phase, through a line (RL (n)) from the nozzle (LS (n)) to the suction side of the mixing pump (P (n + 1j) and a line (RLK (n)) with shut-off and control valve (VLK ( n)) to the suction side of the mixing pump (P (n)), through a line (RS (n)) from the nozzle (SS (n)) to the suction side of the mixing pump (P (n-1)) and a line (RSK (n )) with shutoff and control fitting (VSK (n)) to S _a ugseite the mixing pump (P (n)) and through a conduit (RD (n)) from the pressure side of the mixing pump (P (n)) with the control valve (DK ( n)) into the separation chamber (T (n)) via the socket n (DS (n)). 2) Multi-stage vertical counterflow extractor after Claim 1, characterized by the control valve (VL (n)) in the line (RL (n)) to the suction side of the mixing pump (P (n + 1)) and the control valve (VS (n)) in the line (RS (n)) to the suction side of the mixing pump (P (n-1)). 3) Method of countercurrent extraction of liquid mixtures using the standing countercurrent extractor according to claim 1, characterized in that one optionally in one during operation of the extractor -11 30 98 48/0567 Separation stage, "ordering from separation chamber (T (n)) and Mixing pump (P (n)) regardless of the other's driving style Separation stage leads one of the phases in the cycle or both phases in a single pass. 4) Method according to claim 3> characterized in that to guide the light phase in the circuit, the shut-off Control valve (VLK (n)) in the pipeline (RLK (n)) of the light phase from the nozzle (LS (n)) to the suction side of the Mixing pump (P (n)) opens and the shut-off and control valve (VSK (n)) in the pipeline (RSK (n)) of the heavy phase from the nozzle (SS (n)) to the suction side of the mixing pump (P (η)) closes. 5) Method according to claim 3> characterized in that one the shut-off and control valve (VSK (n)) in the pipeline (RSK (n)) to guide the heavy phase in the circuit the more severe phase from the nozzle (SS (n)) to the suction side of the mixing pump {Ρ (n)) opens and the shut-off and control valve (VLK (n)) in the pipeline (RLK (n)) of the light phase from the nozzle (LS (n)) to the suction side of the mixing pump (P (η)) closes. 6) Method according to claim 3 »characterized in that one for guiding the phases in a straight pass through a separation stage, consisting of the separation chamber (T (n)) and the Mixing pump (P (η)), both the shut-off and control valve (VLK (n)) in the pipeline (RLK (n)) of the light phase from the nozzle (LS (n)) of the separation chamber (T (n)) to the suction side of the mixing pump (P (n)) as well as the shut-off and control valve (VSK (n)) in the pipeline (RSK (n)) of the heavy phase • from the nozzle (SS (n)) of the separation chamber (T (n.)) To the suction side the mixing pump (P (n)) closes. -12- 309846/0567 7) Method according to one or more ^{: of} the preceding claims 3 to 6, characterized in that to lower the level of the phase separation mirror in the separation chamber (T (n)) the shut-off and control valve (VIK (n-1)) in the The pipeline (RLK (n-1)) of the affected phase from the nozzle (IS (n-1)) to the suction side of the mixing pump (P (n-1)) throttles. 8) Method according to one or more of the preceding claims 3 to 6, characterized in that one is used for Raising the level of the phase separation mirror in the separation chamber (T (n)) the shut-off and control valve (VSK (n + 1)) in the pipeline (RSK (n + 1)) of the heavy Phase from the nozzle (SS (n + 1)) to the suction side of the mixing pump (P (n + 1)) throttles. 9) Method according to one or more of the preceding claims 3 to 8 (or 3, 4, 7 »8), characterized in that that in the case of the light phase cycle to adjust the level of the phase separation mirror in the separation chamber (IP (n)) the control valves (VS (n)) in the pipeline (RS (n)) of the south phase to the suction side the mixing pump (P (n-1)) and / or the control valve (VL (n-1)) in the pipeline (RI (n-1)) of the light Phase to the suction side of the mixing pump (P (η)) adjusted; wherein to lower the level of the phase separation mirror Control valves (VI (n)) and (VS (n-1)) are throttled and the control valves (VI (n)) to raise the level and (VS (n-1)) are opened further. ) The method according to one or more of the preceding claims 3 to 9, characterized in that at Heavy phase cycle to adjust the level of the phase separation mirror in the separation chamber (T (n)) -13- 309846/0567 the control valves (VL (nL) in the pipeline (RL (η)) of the light phase to the suction line of the mixing pump (P (n + 1)) and / or, the control valve (VS (n + 1)) in the pipeline (RS (n + 1)) of the heavy blower to the suction side of the mixing pump (P (n)) adjusted, the control valve (VL (n)) and / or (VS (n + 1)) being throttled to lower the level of the phase separation mirror and is opened further to raise the level. 11) Method according to one or more of the preceding claims 3 to 10, characterized in that in the case of a straight passage ^{1 of} the two phases for setting the level of the phase separation mirror in the separation chamber (T (n)), the control valve (VL (n)) ) in the pipeline (RL (n)) to the mixing pump (P (n + 1)) or the control valve (VS (n)) in the pipeline (RS (n)) to the mixing pump (P (n-1)) adjusted, whereby to lower the level the control valve (VS (n)) is opened further and / or the control valve (VL (n)) is throttled and to raise the level (VL (n)) further open and / or (VS (n)) is throttled will. 309846/0567