WO2005089914A1 - Procede et dispositif pour distiller des solutions sur une membrane - Google Patents

Procede et dispositif pour distiller des solutions sur une membrane Download PDF

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Publication number
WO2005089914A1
WO2005089914A1 PCT/EP2005/002874 EP2005002874W WO2005089914A1 WO 2005089914 A1 WO2005089914 A1 WO 2005089914A1 EP 2005002874 W EP2005002874 W EP 2005002874W WO 2005089914 A1 WO2005089914 A1 WO 2005089914A1
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WO
WIPO (PCT)
Prior art keywords
liquid
membrane
condensation
solution
steam
Prior art date
Application number
PCT/EP2005/002874
Other languages
German (de)
English (en)
Inventor
Wolfgang Heinzl
Original Assignee
Wolfgang Heinzl
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 Wolfgang Heinzl filed Critical Wolfgang Heinzl
Publication of WO2005089914A1 publication Critical patent/WO2005089914A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/447—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by membrane distillation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0033—Other features
    • B01D5/0039—Recuperation of heat, e.g. use of heat pump(s), compression
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
    • B01D5/006—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with evaporation or distillation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/36—Pervaporation; Membrane distillation; Liquid permeation
    • B01D61/364—Membrane distillation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/08—Seawater, e.g. for desalination
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

Definitions

  • the invention relates to a method and a device for the distillation of solutions, in particular for the production of fresh water from sea or brackish water.
  • MED Multi Effect Desalination
  • VC Vapor Compression
  • distillation a liquid is evaporated and the vapor condensed.
  • distillation is suitable e.g. for the separation of liquids with different vapor pressure and for the complete or partial separation / separation of liquids from salt solutions.
  • a distillation device that can be implemented in practice must be both inexpensive and energy-efficient. A corresponding distillation process only makes sense if both conditions are met. These requirements can be implemented using the membrane distillation mentioned above.
  • Such a membrane distillation uses a porous, vapor-permeable material.
  • No. 3,340,186 describes a device in which an air-filled microporous, hydrophobic membrane is used, so that a so-called direct contact membrane distillation can be carried out. The warm sea water stream and the cold distillation stream come into direct contact with the membrane.
  • EP 0 088 315 AI describes a device for the continuous distillation of hot saline solutions or of liquid mixtures with different vapor pressure.
  • This known device consists of a thermally conductive vapor-impermeable layer, which forms an elongated wall, and a hydrophobic vapor-permeable membrane, which forms an adjacent or opposite wall, the two walls together forming an elongated distillation collection chamber or a corresponding or distillation collection channel.
  • the chamber or channel has an outlet for the distillate.
  • a spiral wrap configuration is used. Cold sea water (feed) flows in a spiral chamber in the center and absorbs heat from the condensation surface.
  • EP 1 185 356 describes a process for purifying a liquid by membrane distillation, in which steam arising from a liquid flow passes through a porous wall which limits the liquid flow. The steam condenses on a cool condenser surface and forms a condensate flow. The condenser surface separates a supplied liquid stream from the distillation stream. This supplied liquid stream flows in countercurrent to the vapor-emitting liquid stream. In order to increase the distillation flow per driving force unit, a pressure is maintained in the gas channel which is below the ambient pressure. however, is above the vapor pressure of the liquid emitting the vapor.
  • the heat of vaporization is extracted from the liquid flow by cooling and then returned to the liquid flow supplied by heating. leads.
  • at least 20 liters of aqueous liquid must be cooled from 80 ° C to 40 ° C.
  • the solution stream must therefore be at least twenty times as large as the distillate stream generated.
  • the invention has for its object to provide an improved method and an improved device of the type mentioned, in which the aforementioned problems are eliminated.
  • the energy density should be increased, the pumped liquid volume and the need for auxiliary energy reduced, the heat recovery improved and cooling as in the known multi-stage flash evaporation (MSF process) avoided.
  • this object is achieved according to the invention by a) that a liquid flow containing a solution in question is limited on at least one side by a microporous hydrophobic membrane,
  • Process steps a) to d) are preferably repeated several times.
  • Part of the liquid is advantageously evaporated from the liquid flow on a respective membrane by a membrane distillation process with a continuous temperature profile.
  • a membrane distillation process with a continuous temperature profile.
  • the remaining, still remaining steam is expediently condensed on the liquid stream supplied which contains the solution in question.
  • the escaping streams of concentrated solution and distillate are preferably cooled against the liquid stream supplied.
  • Part of the liquid is evaporated from a liquid flow, which is always or mostly delimited at least on one side by a microporous membrane, the evaporated part passing through the membrane as steam, in particular steam, and at a vapor and liquid-tight surface is condensed again.
  • This condensation surface or wall is again opposed by a microporous hydrophobic membrane wall which, with the condensation surface or wall mentioned, has a narrow flow channel filled with solution and of a width in a range of, for example, about 1 to about 8 mm, preferably about 2 to 5 mm. limited.
  • the condensation energy supplied to the condensation surface or wall is thus immediately converted back into evaporation energy in the region of the flow channel.
  • the absolute pressure of the vapor space used for the membrane distillation process can be below the ambient pressure at all points.
  • the steam generated can then be Condense at the steam pressure / temperature corresponding point of the MD process.
  • salt solution is evaporated on a membrane wall.
  • the steam enters through a microporous, hydrophobic membrane into a steam channel with negative pressure and condenses at a point on the condensation surface that corresponds to the temperature / steam pressure.
  • the latent heat absorbed at the condensation surface is immediately used again to evaporate from the solution on the other side through a membrane. This process is repeated several times, with energy efficiency increasing with the number of repetitions.
  • the remaining steam leaving the process is condensed on the supplied solution.
  • the emerging streams of concentrated solution and distillate are cooled against the supplied solution.
  • a multiple arrangement of units each having the features a) to d) is preferably provided.
  • a preferred practical embodiment of the device according to the invention is characterized in that the liquid stream containing the solution in question is at least partially guided in a spiral liquid channel which is delimited on one side by a microporous hydrophobic membrane and on the opposite side by a vapor and liquid-tight condensation wall is, due to the spiral arrangement of the liquid channel between the turns of a corresponding spiral vapor channel is formed, which is bounded on one side by the membrane and on the opposite side by the condensation wall.
  • a spiral arrangement ensures that the membrane surface always comes to lie opposite the condensation wall formed, for example, by a film.
  • the vapor emerging from the solution through the membrane always hits a condensation surface.
  • Such an execution form corresponds thermodynamically to a multiple-effect process with a continuous vapor pressure curve.
  • the uncondensed steam leaving the module is condensed in a cooler or condenser which is cooled by the counter-flowing solution.
  • the solution is preheated as desired.
  • the resulting distillate is drawn off with a pump and passed over a cooler through which the solution flows, the solution again being preheated. Before the solution enters the membrane distillation device, it is further heated by a heat exchanger.
  • Solution-containing liquid streams are fed to the liquid channels and the vapor emerging from a respective preceding stage is fed to the condensation channels of the respective subsequent stage.
  • a membrane distillation process can be implemented that uses thermodynamic mix corresponds to a multiple effects process.
  • the increasing steam volume can be absorbed by a corresponding increase in the number of plates in the individual stages.
  • the steam generator connected upstream of the first stage can in particular comprise a plurality of parallel liquid channels for a liquid containing the solution in question, each delimited by two opposing microporous hydrophobic membranes, a vapor space adjoining each membrane in which the absolute pressure at all points below the Ambient pressure.
  • the non-condensed steam emerging from the spiral or plate module can be condensed in a cooler or condenser which is cooled by the liquid flow containing the solution in question.
  • At least one pump is expediently provided for withdrawing the distillate formed.
  • the resulting distillate can be passed through a cooler through which the liquid stream supplied flows.
  • the supplied liquid stream can expediently be additionally heated via a heat exchanger before the membrane distillation.
  • FIG. 1 shows an exemplary embodiment of a particularly for the production of fresh water from sea or brackish water-usable distillation device with a spiral channel for the liquid stream containing the solution in question
  • Figure 2 shows another exemplary embodiment of the distillation device with stages connected in series, each comprising several plates.
  • FIG. 1 shows a schematic illustration of an exemplary embodiment of a distillation device 10 which can be used in particular for the production of fresh water from sea or brackish water and has a spiral-shaped liquid channel 12 for the liquid stream containing the solution in question.
  • FIG. 2 shows a schematic representation of an exemplary embodiment of a distillation device 10 with stages 14, 16 connected in series, each comprising several plates.
  • a liquid channel 12 containing the solution in question is delimited on at least one side by a microporous hydrophobic membrane 20.
  • a vapor and liquid-tight condensation wall 24 separate from the membrane 20 is provided, on which the vapor condenses at least partially.
  • FIGS. 1 and 2 a multiple arrangement of units each having the features a) to d) is preferably provided.
  • the liquid stream containing the solution in question is at least partially guided in a spiral liquid channel 12.
  • This spiral-shaped liquid channel 12 is delimited on one side by a microporous hydrophobic membrane 20 and on the opposite side by a vapor and liquid-tight condensation wall 24.
  • the membrane 20 is shown as a broken line and the condensation surface or wall 24 as a solid line.
  • the liquid stream 18 containing the solution in question is supplied via a pump 26.
  • the liquid flow flows through a heat exchanger 28, a condenser 30, a further heat exchanger 32 and is preheated in each case in the process.
  • a heat exchanger 34 the liquid containing the solution in question 18 is finally heated up to the upper process temperature.
  • the heated liquid flow enters the spiral module.
  • the liquid channel 12 for the liquid flow is delimited on one side by the membrane 20 (broken line) and on the opposite side by the condensation surface or wall 24 (solid line).
  • the distillate that collects in the channel CC is pumped out by a distillate pump 36.
  • the residual steam is sucked off via the vacuum in the steam channel 22 by a vacuum pump 38 and is condensed in the condenser 30 to the incoming liquid stream containing the solution in question.
  • the condensate is withdrawn from the condenser 30 by means of the distillate pump 36 via the heat exchanger 28.
  • the remaining liquid flow at B is drawn off, passed over the heat exchanger 32 and returned in the direction of the arrow to a suitable reservoir, for example in the sea during desalination.
  • the steam is fed from a steam generator 40 to a first stage 14 with a plurality of plates, which has condensation channels 21, which receive the steam and are parallel to one another and which are respectively delimited by a vapor and liquid-tight condensation wall 24 on opposite sides.
  • each of these condensation walls 24 is opposite a microporous hydrophobic membrane 20 in order to form, together with the condensation wall 24 assigned to it, a respective liquid channel 12 for a liquid flow containing the solution in question. -. , , -
  • a vapor space 23 is again formed between two opposite membranes 20, in which the absolute pressure is below the ambient pressure at all points.
  • At least two stages 14, 16 each comprising several plates are connected in series.
  • the liquid streams emerging from a respective preceding stage 14 and containing the solution in question are fed to the liquid channels 12 of the respective subsequent stage 16 and the vapor from the steam rooms 23 emerging from a respective preceding stage 14 is fed to the condensation channels 21 of the respective subsequent stage 16.
  • the steam generator 40 connected upstream of the stages 14, 16 comprises a plurality of parallel liquid channels 12, each delimited by two mutually opposite microporous hydrophobic membranes 20, for a respective liquid stream 18 containing the solution in question.
  • a respective vapor space 23 adjoins a respective membrane 20, in which the absolute pressure is below the ambient pressure at all points.
  • the non-condensed steam emerging from the plate modules 14, 16 is condensed in a cooler or condenser 42, which is cooled by the liquid flowing through a pump 26 and containing the solution in question.
  • a vacuum pump 38 is again connected to the cooler or condenser 42.
  • the resulting distillate is drawn off via a pump 36, it being passed through a cooler or heat exchanger 28 through which the supplied liquid stream flows.
  • the solution leaving the plate module is passed through a heat exchanger 44 through which the supplied liquid stream flows.
  • the supplied liquid stream 18 is further heated via a heat exchanger 34.

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

La présente invention concerne un procédé pour distiller des solutions, en particulier pour produire de l'eau fraîche à partir d'eau de mer ou saumâtre, le procédé se caractérisant par les étapes suivantes: a) un flux de liquide contenant une solution concernée, est délimité au moins sur un côté par une membrane hydrophobe microporeuse (20); (b) des mesures sont prises pour qu'une partie du liquide du flux de liquide qui est en contact avec la membrane, soit vaporisée, et que la vapeur formée traverse la membrane pour se retrouver dans un canal à vapeur (22) dans lequel la pression absolue est en tout point inférieure à la pression ambiante; c) une paroi de condensation (24) qui est imperméable à la vapeur et aux liquides, et est séparée de la membrane par la canal à vapeur, est utilisée, la vapeur se condensant au moins partiellement contre ladite paroi; et d) le côté de la paroi de condensation, opposé au canal à vapeur, entre à nouveau en contact avec un flux de liquide contenant la solution concernée, qui est délimité sur le côté opposé, à nouveau par une membrane hydrophobe microporeuse (20) de sorte que l'énergie de condensation apportée au flux de liquide, est au moins partiellement convertie en énergie de vaporisation. L'invention a également pour objet un dispositif de distillation correspondant. L'invention concerne aussi un dispositif qui présente des canaux de condensation parallèles qui sont délimités sur des côtés opposés respectivement par une paroi de condensation (24).
PCT/EP2005/002874 2004-03-19 2005-03-17 Procede et dispositif pour distiller des solutions sur une membrane WO2005089914A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004013647.5 2004-03-19
DE102004013647A DE102004013647A1 (de) 2004-03-19 2004-03-19 Verfahren und Vorrichtung zur Destillation von Lösungen

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Cited By (27)

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WO2007054311A1 (fr) * 2005-11-11 2007-05-18 Wolfgang Heinzl Procede de distillation a membrane et dispositif de distillation a membrane
CN1962467B (zh) * 2005-11-09 2010-05-05 王小军 一种循环冷却水的脱盐方法
EP2313172A1 (fr) * 2008-08-14 2011-04-27 Siemens Water Technologies Corp. Configuration de bloc pour distillation sur membrane à grande échelle
WO2012048788A1 (fr) * 2010-10-11 2012-04-19 Aaa Water Technologies Ag Dispositif de distillation multi-étages à membranes
WO2012062392A1 (fr) * 2010-11-10 2012-05-18 Aaa Water Technologies Ag Système d'osmose directe à séparation de solvant par distillation membranaire
CN102583861A (zh) * 2012-02-22 2012-07-18 中国海洋大学 一种膜法海水软化装置进水的预热方法
WO2012116409A1 (fr) 2011-03-03 2012-09-07 Victoria University Système d'échange de chaleur
EP2606953A1 (fr) * 2011-12-23 2013-06-26 Aquaver B.V. Système de distillation membranaire, procédé de démarrage d'un tel système et utilisation associée
NL2009613C2 (en) * 2012-10-11 2014-04-15 Aquaver B V Membrane distillation system, method of starting such a system and use thereof.
NL2009614C2 (en) * 2012-10-11 2014-04-16 Aquaver B V Membrane distillation system, method of starting such a system and use thereof.
NL2009615C2 (en) * 2012-10-11 2014-04-16 Aquaver B V Membrane distillation system, method of starting such a system and use thereof.
WO2014058306A1 (fr) 2012-10-11 2014-04-17 Aquaver B.V. Système de distillation membranaire, procédé de départ d'un tel système et son utilisation
WO2014058305A1 (fr) 2012-10-11 2014-04-17 Aquaver B.V. Système de distillation sur membrane, procédé de mise en route de ce système et son utilisation
WO2014114495A1 (fr) * 2013-01-22 2014-07-31 Aaa Water Technologies Ag Système et procédé de cristallisation
US20140216916A1 (en) * 2011-07-29 2014-08-07 Aaa Water Technologies Ag Membrane distillation device
NL2010576C2 (en) * 2013-04-05 2014-10-08 Aquaver B V A system of membrane distillation and use therof.
US8888078B2 (en) 2009-05-06 2014-11-18 Wolfgang Heinzl Modular flow system
CN104986864A (zh) * 2015-07-09 2015-10-21 清华大学深圳研究生院 一种菌藻共生反应器
CN105592901A (zh) * 2013-06-24 2016-05-18 沃尔夫冈·赫恩佐 结晶系统和方法
US9625194B2 (en) 2010-10-29 2017-04-18 Major Bravo Limited Apparatus for drying and/or cooling gas
WO2017158526A1 (fr) 2016-03-16 2017-09-21 Ecole Polytechnique Federale De Lausanne (Epfl) Système de purification d'eau thermique et procédé de fonctionnement dudit système
CN107583299A (zh) * 2017-10-30 2018-01-16 新中天环保股份有限公司 溶剂蒸馏冷凝器
WO2018095976A1 (fr) 2016-11-22 2018-05-31 Cevap Technology Bv Appareil de distillation à cartouche et son utilisation pour distiller de l'eau
WO2019233610A1 (fr) 2018-06-08 2019-12-12 Evcon Gmbh Appareil de distillation à membrane multiétages
WO2019233611A1 (fr) 2018-06-08 2019-12-12 Evcon Gmbh Appareil de distillation à membrane pour produire de l'eau
WO2023016620A1 (fr) 2021-08-12 2023-02-16 Heinzl, Wolfgang Cadres pour un système d'évaporation et de condensation à effets multiples
EP4385610A1 (fr) 2022-12-13 2024-06-19 EvCon GmbH Système de distillation à étages multiples

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DE102011117194A1 (de) 2011-10-29 2013-05-02 Jürgen Scharfe Verfahren zur Konditionierung von aus mehreren Stoffen bestehenden Gasen oder Flüssigkeiten durch simultanen Wärme- und Stoffaustausch über mikroporöse Membranen
DE102016204451A1 (de) 2016-03-17 2017-09-21 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Destillationseinrichtung mit einem Destillationsmodul für eine Membrandestillation
DE102016204452A1 (de) 2016-03-17 2017-09-21 Mahle Industriefiltration Gmbh Destillationseinrichtung
WO2019233609A1 (fr) 2018-06-08 2019-12-12 Evcon Gmbh Système d'écoulement modulaire avec passage de liquide asymétrique ou discontinu
CN112601603B (zh) 2018-06-08 2023-01-03 伊弗科恩有限责任公司 具有内部支柱构件的模块化流系统
WO2019233606A1 (fr) 2018-06-08 2019-12-12 Evcon Gmbh Système d'écoulement modulaire à configuration de canal de vapeur et/ou de liquide améliorée

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US3477917A (en) * 1966-03-03 1969-11-11 Pactide Corp Multiple effect distillation with microporous membranes and distillate recirculation
GB1225254A (fr) * 1967-03-16 1971-03-17
EP1185356A1 (fr) * 1999-05-27 2002-03-13 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno Procede de purification d'un liquide par distillation membranaire, notamment pour la production d'eau dessalee a partir d'eau de mer, d'eau saumatre ou d'eau de procede

Cited By (59)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1962467B (zh) * 2005-11-09 2010-05-05 王小军 一种循环冷却水的脱盐方法
JP2009514668A (ja) * 2005-11-11 2009-04-09 ハインツェル，ヴォルフガング 膜蒸留プロセスおよび膜蒸留装置
CN101325992B (zh) * 2005-11-11 2011-06-08 沃尔夫冈·海因茨尔 膜蒸馏方法和膜蒸馏装置
US8029675B2 (en) 2005-11-11 2011-10-04 Wolfgang Heinzl Membrane distillation process and membrane distillation device
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