DE1769135B1 - METHOD FOR MANUFACTURING SINTER BODIES FROM AL A METHOD FOR MANUFACTURING SINTER BODIES FROM AL - Google Patents
METHOD FOR MANUFACTURING SINTER BODIES FROM AL A METHOD FOR MANUFACTURING SINTER BODIES FROM ALInfo
- Publication number
- DE1769135B1 DE1769135B1 DE19681769135 DE1769135A DE1769135B1 DE 1769135 B1 DE1769135 B1 DE 1769135B1 DE 19681769135 DE19681769135 DE 19681769135 DE 1769135 A DE1769135 A DE 1769135A DE 1769135 B1 DE1769135 B1 DE 1769135B1
- Authority
- DE
- Germany
- Prior art keywords
- regeneration gas
- adsorber
- adsorption
- bed
- circulated
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/26—Aluminium-containing silicates, i.e. silico-aluminates
- C01B33/28—Base exchange silicates, e.g. zeolites
- C01B33/2807—Zeolitic silicoaluminates with a tridimensional crystalline structure possessing molecular sieve properties; Isomorphous compounds wherein a part of the aluminium ore of the silicon present may be replaced by other elements such as gallium, germanium, phosphorus; Preparation of zeolitic molecular sieves from molecular sieves of another type or from preformed reacting mixtures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/22—Carbon dioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40086—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by using a purge gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/401—Further details for adsorption processes and devices using a single bed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/402—Further details for adsorption processes and devices using two beds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/414—Further details for adsorption processes and devices using different types of adsorbents
- B01D2259/4141—Further details for adsorption processes and devices using different types of adsorbents within a single bed
- B01D2259/4145—Further details for adsorption processes and devices using different types of adsorbents within a single bed arranged in series
- B01D2259/4148—Multiple layers positioned apart from each other
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Separation Of Gases By Adsorption (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Description
1 21 2
Die Erfindung betrifft ein Verfahren und eine Vor- F i g. 2 das Verfahrensschema einer Anlage mit zweiThe invention relates to a method and a prior art. 2 the process scheme of a plant with two
richtung zur Desorption von Wasser und Kohlendioxid umschaltbaren Adsorbern.direction for desorption of water and carbon dioxide switchable adsorbers.
aus Adsorbern mit Molekularsieben bei Regenerier- Die Einzelheiten des Verfahrens werden zunächst anfrom adsorbers with molecular sieves during regeneration- The details of the process are first given
gasmangel. Hand von F i g. 1 erläutert. Es ist ein Adsorber dar-lack of gas. Hand of fig. 1 explained. It is an adsorber
Bekanntlich benutzt man in Gasgemisch-Zerlegungs- 5 gestellt, der beim Beladen von unten nach oben durchanlagen
zum Entfernen von Kohlendioxid und Wasser strömt wird. Das frische Regeneriergas tritt über Lei-Adsorber
mit Molekularsiebschüttungen. Gewöhnlich tung 1 in die Anlage ein, vermischt sich mit dem umwerden
zwei umschaltbare Adsorber betrieben, von gewälzten Regeneriergas in Leitung 10 und wird im
denen der eine seine Reinigungsfunktion erfüllt, wäh- Gebläse 2 verdichtet, um den Widerstand im Adsorrend
der andere mit einem Gas regeneriert wird. Das io ber 8 überwinden zu können. Vorteilhafterweise ver-Regeneriergas,
welches aus der Zerlegungsanlage ver- wendet man ein Gebläse, das in einem Temperaturfügbar ist, reicht oft zum Aufheizen und Abkühlen des bereich vonO bis 300° C arbeiten kann. Es wird dadurch
Adsorptionsmittels nicht aus. In diesen Fällen führt Heizenergie und ein Kühler vor dem Gebläse gespart,
man das Regeneriergas in einem Gaskreislauf mehrfach Das verdichtete Regeneriergas tritt dann in die Heizerdurch
den Adsorber. Das Verfahren arbeitet zufrieden- 15 Kühler-Kombination ein, in der es wahlweise im Heistellend,
solange im Adsorber nur Kohlendioxid ad- zer 3 a erwärmt oder im Kühler 3b gekühlt wird,
sorbiert wird. Wenn auch Wasser adsorbiert ist, wie es Der Adsorber 8 enthält im Innern zwei Molekularmeist
der Fall ist, wird dieses durch das im Kreise siebschüttungen. Die untere Molekularsiebschüttung 6,
laufende Regeneriergas über den ganzen Adsorber welche auf dem Rost 6 a liegt, ist zur Adsorption von
verteilt. Wasser haftet jedoch sehr stark am Molekular- 20 Wasser bestimmt. Die obere Molekularsiebschüttung 7,
sieb. Selbst die geringe Vorbeladung des Molekular- welche auf dem Rost la liegt, dient zur Kohlendioxidsiebes
mit Wasser, wie sie beim Aufheizen mit feuchtem adsorption. Zwischen den beiden Schüttungen ist ein
Regeneriergas entsteht, hemmt die Adsorptionsfähig- freier Raum S.It is well known that one uses a gas mixture decomposition 5 which, when loading, flows through systems from bottom to top to remove carbon dioxide and water. The fresh regeneration gas passes through Lei adsorbers with beds of molecular sieves. Usually device 1 in the system, mixes with the two switchable adsorbers operated by rolled regeneration gas in line 10 and is in which one fulfills its cleaning function, while fan 2 is compressed to the resistance in the adsorber the other with a gas is regenerated. To be able to overcome the io over 8. Advantageously, regeneration gas, which is used from the separation plant, a fan that is available at a temperature is often sufficient for heating and cooling in the range from 0 to 300 ° C. It will not run out of adsorbent. In these cases, heating energy and a cooler in front of the fan are saved, and the regeneration gas is used several times in a gas circuit. The compressed regeneration gas then enters the heater through the adsorber. The method operates satisfactorily, a cooler 15 combination in which it is in Heistellend as long as carbon dioxide is ad- zer 3 a heated or cooled in the radiator 3b, optionally in the adsorber,
is sorbed. If water is also adsorbed, as it is mostly the case, the adsorber 8 contains two molecules inside, this is caused by the sieve beds in the circle. The lower molecular sieve bed 6, running regeneration gas over the entire adsorber which is on the grate 6 a , is distributed for the adsorption of. However, water adheres very strongly to molecular water. The upper molecular sieve bed 7, sieve. Even the slight pre-loading of the molecular weight, which lies on the grate la , serves to sieve carbon dioxide with water, as it does when heating with moist adsorption. A regeneration gas is created between the two beds, which inhibits the adsorption capacity - free space S.
keit für Kohlendioxid außerordentlich. Um diese Das aus der Heizer-Kühler-Kombination 3 komverminderte
Adsorptionsfähigkeit für Kohlendioxid 25 mende Regeneriergas tritt über den Zuführstutzen 4 in
auszugleichen, muß der Adsorber größer ausgelegt den freien Raum 5 ein und wird dort aufgeteilt. Eine
werden, als es an sich für die Kohlendioxidadsorption kleine Teilmenge, die der Menge des in Leitung 1 der
erforderlich ist. Zur Aufheizung der dadurch ver- Anlage zuströmenden frischen Regeneriergases entgrößerten
Molekularsiebmenge ist natürlich auch eine spricht, durchströmt das Molekularsieb 6, desorbiert
größere Regeneriergasmenge erforderlich, was wegen 30 es von Wasser und verläßt den Adsorber über Leides
ohnehin herrschenden Regeneriergasmangels sehr tung 9.
nachteilig ist. Die größere Teilmenge wird umgewälzt. Sie durch-extraordinary ability for carbon dioxide. In order to compensate for this from the heater-cooler combination 3, the adsorptive capacity for carbon dioxide 25 coming regeneration gas enters via the supply port 4, the adsorber must be designed larger in the free space 5 and is divided there. One is considered to be in itself for the carbon dioxide adsorption a small portion that is the amount of in line 1 of the required. To heat the fresh regeneration gas flowing in as a result, there is of course also an advantage, flows through the molecular sieve 6, desorbs a larger amount of regeneration gas, which is because of the water and leaves the adsorber due to the already prevailing lack of regeneration gas 9.
is disadvantageous. The larger part is circulated. You through-
Der Erfindung liegt die Aufgabe zugrunde, ein strömt die Molekularsiebschüttung 7, desorbiert sieThe invention is based on the object that if the molecular sieve bed 7 flows, it desorbs
Desorptionsverfahren der genannten Art zu schaffen, von Kohlendioxid und verläßt den Adsorber über Lei-To create desorption process of the type mentioned, of carbon dioxide and leaves the adsorber via line
bei dem trotz Anwendung eines Regeneriergaskreis- 35 tung 10. Nach der Vereinigung mit dem frischenin which despite the use of a regeneration gas circuit 10. After the union with the fresh
lauf es keine Beladung des gesamten Molekularsiebes Regeneriergas in Leitung 1 wird sie erneut im Gebläse 2If there is no loading of the entire molecular sieve regeneration gas in line 1, it is again in blower 2
mit Wasser erfolgt, der Adsorber und die Regenerier- verdichtet.takes place with water, the adsorber and the regeneration compresses.
gasmenge demzufolge auch nicht vergrößert zu werden Es ist natürlich nicht erforderlich, wenn auch sehramount of gas consequently also not to be increased It is of course not necessary, albeit very much
brauchen. günstig, daß das umgewälzte Regeneriergas zwischento need. favorable that the circulated regeneration gas between
Es wurde nun ein Verfahren zur Desorption von 40 den Molekularsiebschüttungen 6 und 7 eintritt. Es
Wasser und Kohlendioxid aus Adsorbern mit Mole- kann dort auch abgezogen werden und von oben über
kularsieb gefunden, bei dem das Regeneriergas mit Leitung 10 in den Adsorber eintreten.
Hilfe eines Kreislaufes den Adsorber mehrfach durch- Die Molekularsiebschüttung 6 für die H2O~Adsorpströmt.
Nach der Erfindung wird dabei die Molekular- tion kann auch oberhalb der Molekularsiebschüttung 7
siebschüttung im Adsorber in zwei hintereinander- 45 für die COa-Adsorption im Adsorber angebracht sein,
geschaltete Schüttungen aufgeteilt, eine für die CO2- Es kann jede Schüttung einen eigenen Kreislauf erhal-Adsorption
und eine für die H2O-Adsorption, und fer- ten, wobei durch Anbringen von Trennblechen im
ner durchströmt das mit Hilfe des Kreislaufes mehrfach freien Raum 5 dafür gesorgt sein muß, daß sich die
umgewälzte Regeneriergas nur die zur CO2-Adsorption beiden Kreisläufe nicht vermischen können. Schließlich
bestimmte Schüttung, bevor es durch die für die H2O- 50 kann man auch an Stelle eines Behälters mit zwei
Adsorption bestimmte Schüttung den Adsorber ver- Schüttungen bei gleicher Ventilzahl zwei Behälter mit
läßt. Am vorteilhaftesten ist das erfindungsgemäße je einer Schüttung verwenden, wobei dann jede Schüt-Verf
ahren, wenn das umgewälzte Regeneriergas in den tung nur eine Komponente adsorbiert. Entscheidend
freien Raum zwischen den beiden Schüttungen zu- ist allein, daß das für den CO2-TeU umgewälzte Regeführt
wird. 55 generiergas nicht vor Verlassen des Kreislaufes mit demA process for the desorption of the molecular sieve beds 6 and 7 has now been introduced. There water and carbon dioxide from adsorbers with mole- can also be drawn off there and found from above via kularsieb, in which the regeneration gas with line 10 enter the adsorber.
The molecular sieve bed 6 for the H 2 O adsorber flows through the adsorber several times with the aid of a circuit. According to the invention, the molecular ion can also be divided above the molecular sieve bed 7 in the adsorber into two beds connected one behind the other for the CO a adsorption in the adsorber, one for the CO 2 - each bed can have its own Circuit receive adsorption and one for H 2 O adsorption, and by attaching metal dividers in the ner flows through the multiple free space 5 with the help of the circuit must be ensured that the circulated regeneration gas is only the CO 2 -Adsorption cannot mix the two circuits. Finally, a specific bed, before the H 2 O 50 can also be filled with the adsorber bed with the same number of valves, instead of a container with two adsorption. It is most advantageous to use one bed each according to the invention, each pouring method when the circulated regeneration gas adsorbs only one component in the device. The only decisive factor free space between the two beds is that the circulated for the CO 2 -TeU is fed. 55 do not generate gas before leaving the circuit with the
Der Vorteil der Erfindung besteht darin, daß das im H2O-TeU in Berührung kommt.The advantage of the invention is that the H 2 O-TeU comes into contact.
Kreislauf umgewälzte Regeneriergas mit dem in der F i g. 2 zeigt eine Anwendung des eben beschriebe-Regeneration gas circulated in the circuit with the one shown in FIG. 2 shows an application of the just described
ersten Schüttung adsorbierten Wasser überhaupt nicht nen Verfahrens auf zwei umschaltbare Adsorber. Fürfirst pour adsorbed water not at all NEN process on two switchable adsorbers. For
in Berührung kommt. Die für die Kohlendioxid- gleiche Anlagenteile wurden die gleichen Bezugszifferncomes into contact. The same reference numbers have been used for the same parts of the system for the carbon dioxide
adsorption bestimmte Schüttung behält demnach ihre 60 wie in F i g. 1 verwendet. Der Verfahrensablauf ist deradsorption-specific bed therefore retains its 60 as in FIG. 1 used. The process flow is the
volle Adsorptionsfähigkeit, Adsorber und Regenerier- gleiche wie in Fig. 1, so daß sich eine ins einzelnefull adsorption capacity, adsorber and regenerating the same as in Fig. 1, so that one in the individual
gasmengen können klein gehalten werden, die Energie- gehende Beschreibung erübrigt. Die Schaltung der mitgas quantities can be kept small, the energy-related description is superfluous. The circuit of the
kosten werden verringert. Hilfe der Ventile 14 periodisch umschaltbaren Adsor-costs are reduced. Using the valves 14 periodically switchable adsorber
Ein Ausführungsbeispiel der Erfindung wird nun an ber ist bekannt. Über Leitung 11 wird verbrauchtesAn embodiment of the invention will now be known about. Via line 11 is consumed
Hand der Zeichnung erläutert. 65 Regeneriergas abgezogen, über Leitung 12 strömt zuHand of drawing explained. 65 regeneration gas withdrawn, flows in via line 12
Es zeigt reinigendes Rohgas zu den Adsorbern. Mittels Lei-It shows cleaning raw gas to the adsorbers. By means of
F i g. 1 das Verfahrensschema für einen einzelnen tung 13 gelangt das gereinigte Gas aus den AdsorbernF i g. 1 the process scheme for a single device 13, the cleaned gas comes out of the adsorbers
Adsorber, ζ. B. zu einer Zerlegungsanlage.Adsorber, ζ. B. to a cutting plant.
Claims (4)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19681769135 DE1769135B1 (en) | 1968-04-10 | 1968-04-10 | METHOD FOR MANUFACTURING SINTER BODIES FROM AL A METHOD FOR MANUFACTURING SINTER BODIES FROM AL |
FR6908923A FR2005910A1 (en) | 1968-04-10 | 1969-03-26 | |
NL6905120A NL165073C (en) | 1968-04-10 | 1969-04-02 | METHOD AND APPARATUS FOR DESORBING MOLECULAR SCREEN MATERIALS LOADED WITH WATER AND CARBON DIOXIDE. |
SE500669A SE363240B (en) | 1968-04-10 | 1969-04-09 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19681769135 DE1769135B1 (en) | 1968-04-10 | 1968-04-10 | METHOD FOR MANUFACTURING SINTER BODIES FROM AL A METHOD FOR MANUFACTURING SINTER BODIES FROM AL |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1769135B1 true DE1769135B1 (en) | 1970-12-03 |
Family
ID=5700006
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19681769135 Withdrawn DE1769135B1 (en) | 1968-04-10 | 1968-04-10 | METHOD FOR MANUFACTURING SINTER BODIES FROM AL A METHOD FOR MANUFACTURING SINTER BODIES FROM AL |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE1769135B1 (en) |
FR (1) | FR2005910A1 (en) |
NL (1) | NL165073C (en) |
SE (1) | SE363240B (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2208467A1 (en) * | 1971-02-24 | 1972-09-14 | Air Liquide | Adsorption process and adsorption device |
FR2392707A1 (en) * | 1977-06-01 | 1978-12-29 | Linde Ag | PROCESS FOR PURIFYING AND SEPARATING A MIXTURE OF GAS IN ITS CONSTITUENTS |
EP0004465A2 (en) * | 1978-03-24 | 1979-10-03 | Air Products And Chemicals, Inc. | Method of regenerating adsorbents |
DE2921560A1 (en) * | 1979-05-28 | 1980-12-04 | Kernforschungsz Karlsruhe | METHOD AND DEVICE FOR REMOVING OR. DESORBING COMPONENTS OF GAS SHAPED MEDIA ADDED IN SORPTION MATERIALS |
EP0146082A2 (en) * | 1983-12-15 | 1985-06-26 | Linde Aktiengesellschaft | Process for the separation of water vapour and carbon dioxide from a gas stream by adsorption |
DE3533313A1 (en) * | 1984-09-27 | 1986-05-28 | HKN Lösungsmittelrückgewinnungsanlagen GmbH, 5010 Bergheim | Process and apparatus for separating off and recovering volatile solvents |
EP0212493A1 (en) * | 1985-08-12 | 1987-03-04 | Linde Aktiengesellschaft | Pressure swing adsorption process |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4233038A (en) * | 1979-08-06 | 1980-11-11 | Air Products And Chemicals, Inc. | Reactivation system for water-carbon dioxide adsorbers |
-
1968
- 1968-04-10 DE DE19681769135 patent/DE1769135B1/en not_active Withdrawn
-
1969
- 1969-03-26 FR FR6908923A patent/FR2005910A1/fr not_active Withdrawn
- 1969-04-02 NL NL6905120A patent/NL165073C/en not_active IP Right Cessation
- 1969-04-09 SE SE500669A patent/SE363240B/xx unknown
Non-Patent Citations (1)
Title |
---|
None * |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2208467A1 (en) * | 1971-02-24 | 1972-09-14 | Air Liquide | Adsorption process and adsorption device |
FR2392707A1 (en) * | 1977-06-01 | 1978-12-29 | Linde Ag | PROCESS FOR PURIFYING AND SEPARATING A MIXTURE OF GAS IN ITS CONSTITUENTS |
EP0004465A2 (en) * | 1978-03-24 | 1979-10-03 | Air Products And Chemicals, Inc. | Method of regenerating adsorbents |
EP0004465A3 (en) * | 1978-03-24 | 1979-10-31 | Air Products And Chemicals, Inc. | Method of regenerating adsorbents |
DE2921560A1 (en) * | 1979-05-28 | 1980-12-04 | Kernforschungsz Karlsruhe | METHOD AND DEVICE FOR REMOVING OR. DESORBING COMPONENTS OF GAS SHAPED MEDIA ADDED IN SORPTION MATERIALS |
EP0146082A2 (en) * | 1983-12-15 | 1985-06-26 | Linde Aktiengesellschaft | Process for the separation of water vapour and carbon dioxide from a gas stream by adsorption |
EP0146082A3 (en) * | 1983-12-15 | 1987-01-07 | Linde Aktiengesellschaft | Process for the separation of water vapour and carbon dioxide from a gas stream by adsorption |
DE3533313A1 (en) * | 1984-09-27 | 1986-05-28 | HKN Lösungsmittelrückgewinnungsanlagen GmbH, 5010 Bergheim | Process and apparatus for separating off and recovering volatile solvents |
EP0212493A1 (en) * | 1985-08-12 | 1987-03-04 | Linde Aktiengesellschaft | Pressure swing adsorption process |
Also Published As
Publication number | Publication date |
---|---|
FR2005910A1 (en) | 1969-12-19 |
NL165073C (en) | 1981-03-16 |
NL165073B (en) | 1980-10-15 |
SE363240B (en) | 1974-01-14 |
NL6905120A (en) | 1969-10-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
E77 | Valid patent as to the heymanns-index 1977 | ||
8339 | Ceased/non-payment of the annual fee |