WO1997043022A1 - Dispositif separateur pour flux de liquides, destines notamment a des colonnes de distillation - Google Patents

Dispositif separateur pour flux de liquides, destines notamment a des colonnes de distillation Download PDF

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Publication number
WO1997043022A1
WO1997043022A1 PCT/EP1997/002381 EP9702381W WO9743022A1 WO 1997043022 A1 WO1997043022 A1 WO 1997043022A1 EP 9702381 W EP9702381 W EP 9702381W WO 9743022 A1 WO9743022 A1 WO 9743022A1
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WO
WIPO (PCT)
Prior art keywords
distillate
return
weir
column
pan
Prior art date
Application number
PCT/EP1997/002381
Other languages
German (de)
English (en)
Inventor
Roland Niebl
Original Assignee
Raschig Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Raschig Gmbh filed Critical Raschig Gmbh
Publication of WO1997043022A1 publication Critical patent/WO1997043022A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/14—Fractional distillation or use of a fractionation or rectification column
    • B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/42—Regulation; Control
    • B01D3/4205—Reflux ratio control splitter

Definitions

  • the condensate flow is divided into return and distillate in a return distributor.
  • the composition of the mixture of substances to be separated hardly changes, so a reflux ratio once determined can remain fixed.
  • this is generally achieved by installing collecting cups of different sizes, which are located in the condenser bottom and separate the return flow from the condensate flow.
  • a distillation column works in batch mode, it also has a distillation bubble in which the total amount of the mixture of substances to be fractionated is at the start of the distillation. In the course of the distillation, however, the composition of the mixture of substances changes due to the removal of the lower-boiling constituent, so that the composition of the vapor phase which flows through the column also changes. If the distillation apparatus is to be operated optimally at a constant distillate concentration, the reflux ratio must also be adapted to the corresponding distillation conditions. This makes a more complex return divider necessary. Laboratory and pilot plant systems are usually equipped with an electromagnetic three-way valve, which is controlled by a timer and switches back and forth between the return flow and the distillate
  • Another possibility is to collect the liquid streams in separate containers and to supply them in a targeted manner via metering pumps. This technique is also very complex
  • the object of the present invention is therefore to provide a divider for liquid streams, such as the return from distillation columns, which is very simple and inexpensive to set up and operate, and which essentially does without moving parts, so that it can also operate in a vacuum can be used without requiring expensive seals
  • This object is achieved with a divider for liquid streams, in particular for dividing the reflux for distillation columns in order to set a desired reflux ratio between the distillate derived and returned to the column.
  • It consists of a distributor housing with condensate inlet and a distillate outlet and a column return according to the invention in that the distributor housing is subdivided into three troughs which can be flooded, separated by two weirs, and the condensate inlet is connected to the first trough and the third trough of the column return .
  • the second trough is divided into separate chambers by transverse plates, each of which has its own partial drain connected to the distillate drain, the partial drain being provided with separate shut-off means and the third trough being connected to the second trough by a separate weir.
  • baffles in a distributor housing, as a result of which three chambers are created.
  • the condensate inlet opens into the first basin, the condensate chamber.
  • the second basin is divided by transverse plates in distillate chambers with one outlet each, which are provided with valves.
  • the return chamber is located after the distillate chambers.
  • the only factor responsible for the distribution ratio is the length of the individual distillate chambers.
  • the divider therefore does not require any jam nozzles that tend to clog, the valves can be manual valves but also magnetic or pneumatic valves in a simple manner.
  • the division ratio of the liquid flows thus depends only on the distance between the transverse plates, which subdivide the first weir (and thus also the second pan) accordingly.
  • the invention proposes to provide the upper edge of the first weir with a toothing which reliably maintains the desired division intended by the transverse plates, the toothing being parallel , generated flow vectors perpendicular to the weir.
  • the second trough is preferably divided into four distillate chambers, the transverse plates dividing the first weir in an aspect ratio of 1: 2: 2: 5.
  • the desired reflux ratio can be set in steps of ten from 0, 10, 20 etc. to 100% by opening or closing the chamber valves accordingly, since the numbers 1, 2, 2 and 5 combine to produce any number between 1 and 10 represents.
  • the weirs and thus also the troughs are closed in a particularly elegant manner in order to obtain a space-saving construction
  • the condensate can be fed into the outer ring chamber, but a central inlet is preferred, e.g. to avoid circulating in the outer tub
  • Figure 1 is a plan view of a rectangular liquid divider
  • FIG. 3 in cross section
  • FIG. 4 shows a plan view of a round liquid divider
  • FIG. 1 shows the distributor housing 1 for a distillation column, which has an upper circumferential flange 16 with bores 17 for fastening a cover (FIG. 2).
  • the housing 1 has three troughs 9, 10, 11, which are separated by two weirs 4, 5 are separated
  • the middle pan 10 is divided by transverse plates 6 into four separate distillate chambers 18, 19, 20 and 21, each of which has its own partial drain 12, 13, 14 and 15
  • the trough 9 is assigned a condensate inlet 2, which floods the first undivided trough 9, after which the liquid flows into the chambers 18, 19, 20, 21 via the weir 4 divided second tray arrives so that the incoming distillate stream through the inlet 2 is divided in the ratio of the distance between the transverse plates 6.
  • the division in relation to the tub length is preferably chosen such that a chamber 21 has 10% of the tub length, two 19 and 20 have a 20% and an 18 a 50%. For example, if one closes the partial drains 12 to 14, the chambers 18, 19 and 20 are flooded and their partial flows pass completely into the third trough 11 and emerge via the column return 8, whereas 10% of the liquid flow in the under the Distributor housing 1 lying distillate drain. If you also open the partial drain 14, the chamber 20, this is 30%, so that the return can be adjusted by 0 to 100% by simply opening and closing valves in 10% steps.
  • FIG. 2 shows a longitudinal section through the central trough 10 of the distributor housing 1 with the circumferential flange 16 and a cover 22.
  • the chambers 18 to 21, which are divided in the selected ratio, can be seen, each of which has bottom-side partial drains 12 to 15, which for Distillate drain 7 can be summarized.
  • the condensate inlet 2 can, as shown, be arranged on the head side. Furthermore, the higher weir 4 seen in the direction of flow can be seen and the lower, second weir 5 is indicated.
  • Figure 3 shows this in cross section, with the housing 1 and its cover 22, in which the condensate inlet 2 is arranged.
  • a baffle 3 depends on the cover 22, which smoothes the flow towards the weir 4 and keeps it free of waves.
  • the partial drains 12, 13, 14 are located under the trays 10 and 11, the column return line under the tray 11 and an emptying line 23 under the tray 9.
  • Figure 4 shows a plan view of a variant of Figure 1, wherein the distributor housing 1 is circular.
  • the flange 16 with its bores 17 surrounds the ring-shaped outer trough 11, two concentric weirs 5 and 4 encompass the middle trough 10, which is divided by radial transverse plates 6.
  • the central circular trough 9 serves the inflow, from which the distillate passes through the teeth 24 of the weir 4 into the chambers of the central trough 10.
  • a mounting plate 25 which supports the distributor housing 1 and to which the column return 8 can be connected, so that the discharge takes place laterally.
  • the cover 22 is on the flange 16.
  • the baffle 3 is closed in a ring and welded to the cover 22.
  • the condensate inlet 2 is at the top.
  • the inner weir 4 is higher than the following 5.
  • the spatial representation in FIG. 6 shows that the toothing 24 of the first weir 4 can be relatively coarse, the tooth base being higher than the upper edge of the second weir 5 in order to prevent backflow.
  • the flange 16 carries the cover 22. For work under vacuum, these are of large dimensions and have a small hole spacing for screwing and sealing.
  • the column return 8 is connected on the side. Reference list

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

L'invention concerne un dispositif séparateur pour flux de liquides, notamment pour la séparation du reflux de colonnes de distillation, afin de fixer un rapport de reflux souhaité entre le distillat évacué et le distillat réintroduit dans la colonne. Ce dispositif comprend un boîtier de répartition (1) avec une admission de condensat (2) ainsi qu'une évacuation de distillat et une conduite de retour (8) vers la colonne. Le boîtier de répartition (1) est divisé en trois cuves (9, 10, 11) pouvant être remplies l'une après l'autre et séparées par deux barrages. L'admission de condensat (2) est raccordée à la première cuve (9), et la conduite de retour (8) vers la colonne est raccordée à la troisième cuve (11). La deuxième cuve (10) est divisée par des tôles transversales (6) en chambres séparées (18, 19, 20, 21) qui présentent chacune des écoulements partiels (12, 13, 14, 15) raccordés à l'évacuation de distillat. Ces écoulements partiels sont munis de dispositifs d'arrêt et la troisième cuve (11) est raccordée à la deuxième cuve (10) par un barrage (5) qui lui est propre.
PCT/EP1997/002381 1996-05-14 1997-05-09 Dispositif separateur pour flux de liquides, destines notamment a des colonnes de distillation WO1997043022A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996119406 DE19619406C1 (de) 1996-05-14 1996-05-14 Teiler für Flüssigkeitsströme insbesondere für Destillationskolonnen
DE19619406.7 1996-05-14

Publications (1)

Publication Number Publication Date
WO1997043022A1 true WO1997043022A1 (fr) 1997-11-20

Family

ID=7794281

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/002381 WO1997043022A1 (fr) 1996-05-14 1997-05-09 Dispositif separateur pour flux de liquides, destines notamment a des colonnes de distillation

Country Status (2)

Country Link
DE (1) DE19619406C1 (fr)
WO (1) WO1997043022A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2676602A (en) * 1952-10-28 1954-04-27 Pure Oil Co Stream divider for proportioning the flow of liquids
DE2103287A1 (de) * 1970-02-10 1971-08-19 Aerojet General Corp , El Monte, Cahf (VStA) Vorwarmer fur Mehrkorper Verdampfer
DE3310116C1 (de) * 1983-03-21 1984-08-16 Edeleanu Gmbh, 6000 Frankfurt Vorrichtung zur Vermeidung bzw. weitgehenden Reduzierung von Lösungsmittelemissionen in Destillationssystemen
US4484983A (en) * 1983-05-23 1984-11-27 Shell Oil Company Distillation and vapor treatment process

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2676602A (en) * 1952-10-28 1954-04-27 Pure Oil Co Stream divider for proportioning the flow of liquids
DE2103287A1 (de) * 1970-02-10 1971-08-19 Aerojet General Corp , El Monte, Cahf (VStA) Vorwarmer fur Mehrkorper Verdampfer
DE3310116C1 (de) * 1983-03-21 1984-08-16 Edeleanu Gmbh, 6000 Frankfurt Vorrichtung zur Vermeidung bzw. weitgehenden Reduzierung von Lösungsmittelemissionen in Destillationssystemen
US4484983A (en) * 1983-05-23 1984-11-27 Shell Oil Company Distillation and vapor treatment process

Also Published As

Publication number Publication date
DE19619406C1 (de) 1997-09-04

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