WO2003011469A2 - Verbesserter fallfilmverdampfer zur auftrennung von stoffgemischen - Google Patents
Verbesserter fallfilmverdampfer zur auftrennung von stoffgemischen Download PDFInfo
- Publication number
- WO2003011469A2 WO2003011469A2 PCT/EP2002/007609 EP0207609W WO03011469A2 WO 2003011469 A2 WO2003011469 A2 WO 2003011469A2 EP 0207609 W EP0207609 W EP 0207609W WO 03011469 A2 WO03011469 A2 WO 03011469A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film evaporator
- falling film
- vapor space
- heat exchanger
- substances
- Prior art date
Links
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
- B01D3/322—Reboiler specifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/06—Evaporators with vertical tubes
- B01D1/065—Evaporators with vertical tubes by film evaporating
Definitions
- Falling film evaporators are described, for example, in Billet, R.: Verdampfung 20 and their technical applications, Verlag Chemie Weinheim, 1981. Falling film evaporators are usually used to separate temperature-sensitive fluid mixtures, to concentrate solutions, etc. As a rule, falling film evaporators are used at pressures up to approx. 20 bar, in the vacuum range up to approx. 25 50 mbar. At lower pressures, the use of falling film evaporators is usually restricted, since due to the pressure loss occurring in the pipes, in the downstream vapor space and in the condenser system, the process engineering and economic outlay for the downstream vacuum system 30 increases significantly. However, these complex apparatuses are significantly more expensive in terms of investment and operation and lead to a process-technically complex process.
- the heat exchanger (s) arranged in the vapor space - hereinafter generally referred to as the heat exchanger system - advantageously brings about partial or complete condensation of the vapors directly in the vapor space of the falling film evaporator. This eliminates external piping to external condenser systems, which leads to significantly reduced pressure losses in the overall system consisting of falling film evaporator and condenser system.
- the heat exchanger system is located directly in the upper part of the vapor space. It consists of two plate capacitors (9, 11), which are separated from each other by the separating plate (10).
- the two-stage arrangement of the heat exchanger system advantageously enables partial condensation of mixtures of substances of different composition and removal of the fractions via lines (12), (13). Depending on the separation task at hand, the material flows thus obtained can be sent to the corresponding further processing.
- the residual vapor is drawn off via line (14) and vacuum system (15).
- the heat exchanger system integrated in the vapor space of the falling film evaporator has one or preferably a plurality of heat exchangers. If several heat exchangers are used, different fractions from the vapor withdrawn can be partially condensed by operating the heat exchanger appropriately.
- the condensate streams obtained in this way are preferably discharged separately and passed to corresponding further processing stages.
- Suitable heat exchangers are, for example, pipe coils or pipe bundles installed in the vapor space; plate heat exchangers are preferably used. Because of their relatively high heat transfer numbers and at the same time small pressure losses, these offer high performance and also open up the possibility of specifically adjusting the operating conditions of the individual partial condensers.
- the plate heat exchangers can be provided for condensation in cocurrent or countercurrent, depending on the process engineering task. The specific operating conditions depend on the respective material system and the separation requirements. They can be determined by the specialist through routine tests.
- the number of heat exchangers used is generally not limited, preferably two or three are used. However, more heat exchangers can also be used. As already described, it can be particularly advisable to position the sump vent separately from the vapor space.
- an overflow weir is installed in the vapor space, which completely or partially prevents backmixing of the liquid flowing out of the tubes of the falling film evaporator with the product stream flowing into the vapor space.
- the mixture of substances to be separated is fed to a falling film evaporator.
- a gaseous phase vapors
- a heated heat exchanger is used to expelled from the mixture of substances.
- Plate heat exchangers are preferably used in the process. These are particularly effective in the separation performance and also make it possible to achieve specific results with regard to partial condensation by means of specific operating specifications.
- the respective concrete specifications depend on the material system and the separation task and can be determined by the expert through routine tests.
- one or preferably more heat exchangers are used for the condensation. It is advisable to separate the respective condensate flows. It may be particularly advisable to design the process in such a way that the suction hood is positioned separately from the vapor space.
- the method according to the invention is particularly suitable for operations at relatively low pressures. In general, it is suitable for pressures of approximately 1 mbar to 20 bar, preferably 3 mbar to 1 bar.
- a large number of substance mixtures can be separated using the device according to the invention and the method according to the invention.
- mixtures which are sensitive to temperature and which, in addition to the product of value, contain components which, because of their concentration or the position of the phase equilibrium, boil closely to the product of value are particularly suitable. In such mixtures, partial evaporation leads to a partial transition of the product of value into the vapor stream.
- the device according to the invention can effectively minimize the losses in the valuable product.
- One example that can be mentioned here is the separation of low boilers from a material stream containing vitamin E acetate, which boil closely to the valuable product vitamin E acate.
- VEA loss 2.5% based on the incoming amount of VEA.
- the composition of the incoming product stream was 2.6% low boilers, 94.1% VEA, 1.2% high boilers and 2.1% isomers of the VEA.
- the outlet temperature of the product stream running out of the tube bundle was set to 243 ° C. at a pressure of 3 mbar.
- the outlet temperature at the first condenser was set to 180 ° C, the temperature for almost complete condensation of the remaining vapors was 150 ° C.
- the analysis of the material flow occurring at the first capacitor showed the following Composition: 13.5% low boilers, 83.9% VEA, 2.6% isomers of the VEA.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002328860A AU2002328860A1 (en) | 2001-07-21 | 2002-07-09 | Improved falling-film evaporator for separating substance mixtures |
EP02764652A EP1412042A2 (de) | 2001-07-21 | 2002-07-09 | Verbesserter fallfilmverdampfer zur auftrennung von stoffgemischen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10135716.8 | 2001-07-21 | ||
DE2001135716 DE10135716A1 (de) | 2001-07-21 | 2001-07-21 | Verbesserter Fallfilmverdampfer zur Auftrennung von Stoffgemischen |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2003011469A2 true WO2003011469A2 (de) | 2003-02-13 |
WO2003011469A3 WO2003011469A3 (de) | 2003-04-17 |
Family
ID=7692726
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/007609 WO2003011469A2 (de) | 2001-07-21 | 2002-07-09 | Verbesserter fallfilmverdampfer zur auftrennung von stoffgemischen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1412042A2 (de) |
AU (1) | AU2002328860A1 (de) |
DE (1) | DE10135716A1 (de) |
WO (1) | WO2003011469A2 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100350209C (zh) * | 2005-11-10 | 2007-11-21 | 上海交通大学 | 降膜型滚压强化管束蒸发换热器 |
KR20110092326A (ko) * | 2008-11-27 | 2011-08-17 | 바스프 에스이 | 증류에 의한 분리 장치 |
DE102010026835B4 (de) * | 2010-07-11 | 2014-07-10 | Air Liquide Global E&C Solutions Germany Gmbh | Verfahren zur Destillation von temperaturempfindlichen Flüssigkeiten |
EP4327906A1 (de) * | 2022-08-26 | 2024-02-28 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Vorrichtung mit integriertem kondensator und abscheider |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2065728A (en) * | 1932-12-20 | 1936-12-29 | Ici Ltd | Process for removing low molecular glycerides from polymerized oils by distillation |
EP0009251A1 (de) * | 1978-09-21 | 1980-04-02 | L. Givaudan & Cie Société Anonyme | Fraktionierverfahren und -vorrichtung |
DE19602640A1 (de) * | 1996-01-25 | 1997-07-31 | Basf Ag | Verfahren und Verdampfer zur Verdampfung oxidationsempfindlicher Verbindungen |
WO2001038283A1 (en) * | 1999-11-26 | 2001-05-31 | Purac Biochem B.V. | Purification of aqueous solutions of organic acids |
-
2001
- 2001-07-21 DE DE2001135716 patent/DE10135716A1/de not_active Withdrawn
-
2002
- 2002-07-09 EP EP02764652A patent/EP1412042A2/de not_active Withdrawn
- 2002-07-09 WO PCT/EP2002/007609 patent/WO2003011469A2/de not_active Application Discontinuation
- 2002-07-09 AU AU2002328860A patent/AU2002328860A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2065728A (en) * | 1932-12-20 | 1936-12-29 | Ici Ltd | Process for removing low molecular glycerides from polymerized oils by distillation |
EP0009251A1 (de) * | 1978-09-21 | 1980-04-02 | L. Givaudan & Cie Société Anonyme | Fraktionierverfahren und -vorrichtung |
DE19602640A1 (de) * | 1996-01-25 | 1997-07-31 | Basf Ag | Verfahren und Verdampfer zur Verdampfung oxidationsempfindlicher Verbindungen |
WO2001038283A1 (en) * | 1999-11-26 | 2001-05-31 | Purac Biochem B.V. | Purification of aqueous solutions of organic acids |
Also Published As
Publication number | Publication date |
---|---|
WO2003011469A3 (de) | 2003-04-17 |
DE10135716A1 (de) | 2003-02-06 |
AU2002328860A1 (en) | 2003-02-17 |
EP1412042A2 (de) | 2004-04-28 |
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