DE3219036A1 - Method for reactivating polar adsorbents - Google Patents

Method for reactivating polar adsorbents

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Publication number
DE3219036A1
DE3219036A1 DE19823219036 DE3219036A DE3219036A1 DE 3219036 A1 DE3219036 A1 DE 3219036A1 DE 19823219036 DE19823219036 DE 19823219036 DE 3219036 A DE3219036 A DE 3219036A DE 3219036 A1 DE3219036 A1 DE 3219036A1
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Germany
Prior art keywords
adsorbents
boiling
hydrocarbons
reactivation
reactivating
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DE19823219036
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German (de)
Inventor
Martin Dr. 8000 München Alexander
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DEUTSCHE FORSCH DRUCK REPROD
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DEUTSCHE FORSCH DRUCK REPROD
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Priority to DE19823219036 priority Critical patent/DE3219036A1/en
Publication of DE3219036A1 publication Critical patent/DE3219036A1/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
    • B01J20/08—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/12—Naturally occurring clays or bleaching earth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/34—Regenerating or reactivating
    • B01J20/3433—Regenerating or reactivating of sorbents or filter aids other than those covered by B01J20/3408 - B01J20/3425
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/34—Regenerating or reactivating
    • B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
    • B01J20/3458—Regenerating or reactivating using a particular desorbing compound or mixture in the gas phase
    • B01J20/3466—Regenerating or reactivating using a particular desorbing compound or mixture in the gas phase with steam

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

The invention relates to a method for reactivating polar adsorbents which are loaded with high-boiling hydrocarbons. This involves using steam having a temperature below 120 DEG C as a purging agent. The method is distinguished by high operational reliability and safety and by a simple, energy-saving procedure.

Description

Verfahren zur Reaktivierung von polaren Adsorptionsmitteln Process for reactivating polar adsorbents

Die Erfindung betrifft ein Verfahren zur Reaktivierung von polaren Adsorptionsmitteln, die mit hochsiedenden Kohlenwasserstoffen (Kp 150 bis 4000C, insbesondere 210 bis 34O0C), beladen sind.The invention relates to a process for the reactivation of polar adsorbents (up to 400 0 C, in particular 210 to 34O 0 C Kp 150) laden with high-boiling hydrocarbons.

Gegenstand der deutschen Patentanmeldung P 28 52 755.1-43 ist ein Verfahren zur Reinigung der Abluft von Trocknern an Druckmaschinen unter Verwendung von technischem Aluminiumoxid als Adsorptionsmittel.The subject of the German patent application P 28 52 755.1-43 is a method for cleaning the exhaust air from dryers on printing machines using technical aluminum oxide as an adsorbent.

Beim Druckprozeß, insbesondere beim Offsetprozeß, wird Druckfarbe als pastöse Flüssigkeit auf den Bedruckstoff, z.B. auf Papier, übertragen. Der so hergestellte Druck ist erst dann gebrauchsfertig, wenn die Farbe beim Berühren nicht mehr abschmieren kann. Um diesen Zustand rasch zu erreichen, erfolgt insbesondere beim Rollenoffsetdruck eine Trocknung durch Aufblasen erhitzter Luft. Die dabei entstehende Abluft enthält flüchtige Anteile aus dem bedruckten Material, und zwar neben Wasserdampf im wesentlichen verdampfte Mineralöle (einige g pro Nm3). Diese entstammen der Druckfarbe und bestehen aus hochsiedenden Kohlenwasserstoffen (Kp 150 bis 4000C, insbesondere 210 bis 34O0C). Die Temperatur dieser Abluft liegt üblicherweise zwischen 130 und 250°C·In the printing process, especially in the offset process, printing ink is transferred as a pasty liquid onto the printing material, for example onto paper. The print produced in this way is only ready for use when the ink can no longer smear when touched. In order to achieve this state quickly, drying is carried out by blowing heated air, particularly with web offset printing. The resulting exhaust air contains volatile components from the printed material, namely, in addition to water vapor, essentially evaporated mineral oils (a few g per Nm 3 ). These derive from the printing ink and are composed of high boiling point hydrocarbons (boiling point 150 to 400 0 C, in particular 210 to 34O 0 C). The temperature of this exhaust air is usually between 130 and 250 ° C

Die Reinigung einer in dieser Weise belasteten Abluft erfolgt bei dem Verfahren gemäß der Patentanmeldung P 28 52 755.1-43 durch Verwendung von technischem Aluminiumoxid als Adsorptionsmittel. Außer technischem Aluminiumoxid sind auch andere polare Oxide, wie Kieselgel, mineralische Tonerde oder Eisenoxide, als Adsorptionsmittel geeignet. Bei diesem Adsorptions-Verfahren wird die Tatsache ausgenutzt, daß sich die genannten Oxide im Gasstrom bei Temperaturen von beispielsweise 130 bis 2500C mit Mineralölen beladen, ohne daß dem die gleichzeitige Anwesenheit von Wasserdampf entgegensteht.The cleaning of an exhaust air polluted in this way takes place in the process according to patent application P 28 52 755.1-43 by using technical aluminum oxide as an adsorbent. In addition to technical aluminum oxide, other polar oxides, such as silica gel, mineral alumina or iron oxides, are also suitable as adsorbents. This adsorption process makes use of the fact that the oxides mentioned in the gas stream are loaded with mineral oils at temperatures of, for example, 130 to 250 ° C., without the simultaneous presence of water vapor preventing this.

Wird nun auf diese Weise die Abluft gereinigt, so ist die Adsorptions-Kapazität nach einiger Zeit erschöpft, und das Adsorptionsmittel muß reaktiviert werden, ehe es erneut Verwendung finden kann. Zur Befreiung vom aufgenommenen Mineralöl erfolgt bei dem Verfahren gemäß der Patentanmeldung P 28 52 755.1-43 ein Ausheizen des Adsorptionsmittels bei höherer Temperatur (z.B. 4000C) im Luftstrom, wobei die organischen Substanzen verbrennen.If the exhaust air is cleaned in this way, the adsorption capacity is exhausted after some time and the adsorbent must be reactivated before it can be used again. The patent application P 28 52 755.1-43 is performed to liberate the captured oil in the method according to an annealing of the adsorbent at elevated temperature (eg 400 0 C) in the air stream, wherein the organic substances burn.

Eine derartige Verfahrensweise ist jedoch in ihrer technischen Anwendung nicht ganz problemlos, weil die Möglichkeit einer Explosion ausgeschlossen werden muß. Dies kann man durch offenes Abbrennen der organischen Substanzen auf dem Adsorptionsmittel oder durch eine Desorption mit sauerstoffarmer Luft, z.B. mit inertisierten Gasen, erreichen, doch kann im ersteren Fall die dabei frei werdende Wärme nur schwer genutzt werden, während im letzteren Fall dasHowever, such a procedure is not entirely problem-free in its technical application, because the possibility of an explosion must be excluded. You can do this by burning the organic substances on the adsorbent or by desorption with oxygen-poor air, e.g. with inert gases, but in the former case the heat released can only heavily used, while in the latter case the

• · III• · III

verdampfte Mineralöl erneut verhältnismäßig verdünnt vorliegt.evaporated mineral oil is again relatively diluted.

Der Erfindung liegt daher die Aufgabe zugrunde, ein neuartiges Verfahren zur Reaktivierung von mit hochsiedenden Kohlenwasserstoffen beladenen, polaren Adsorptionsmitteln zu schaffen, das sich auf besonders einfache und betriebssichere Weise sowie mit geringen Energiekosten durchführen läßt.The invention is therefore based on the object of a novel process for reactivating with high-boiling Hydrocarbon-laden, polar adsorbents to create that relate to particularly can be carried out in a simple and reliable manner and with low energy costs.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß Wasserdampf mit einer Temperatur von unter 1200C als Spülmittel verwendet wird.According to the invention, this object is achieved in that water vapor with a temperature of below 120 ° C. is used as the rinsing agent.

Zum Stand der Technik gehört bereits die Reaktivierung von Aktivkohle (einem Adsorptionsmittel für wenig polare Stoffe) mittels Wasserdampfes. Die Temperatur des hierbei benutzten Wasserdampfes liegt in der Größenordnung des Siedepunktes der zu verdrängenden adsorbierten Flüssigkeiten von verhältnismäßig niedrigem Siedepunkt (z.B. Toluol). Die Reaktivierung (Desorption) beruht hierbei im wesentlichen auf einem Verdampfen der adsorbierten Stoffe.The reactivation of activated carbon (an adsorbent for little polar substances) by means of water vapor. The temperature of the water vapor used for this is in the order of magnitude of the boiling point of the adsorbed liquids to be displaced from relatively low boiling point (e.g. toluene). The reactivation (desorption) is essentially based on this on evaporation of the adsorbed substances.

Versucht man nun in entsprechender Weise mit hochsiedenden Kohlenwasserstoffen beladene polare Adsorptionsmittel durch Behandlung mit Wasserdampf zu reaktivieren, der auf eine Temperatur entsprechend dem Siedepunkt der hochsiedenden Kohlenwasserstoffe überhitzt ist, so stellt man fest, daß überhaupt keine Reaktivierung erreicht wird.If one tries in a corresponding way with high-boiling hydrocarbons loaded polar adsorbents reactivate by treatment with water vapor, which is adjusted to a temperature accordingly the boiling point of the high-boiling hydrocarbons is overheated, it is found that at all no reactivation is achieved.

Demgegenüber wurde bei den der Erfindung zugrundeliegenden Versuchen überraschend gefunden, daß die Reaktivierung dann gelingt, wenn die Temperatur des Wasserdampfes wesentlich niedriger als die Siedetemperatur der adsorbierten hochsiedenden Kohlenwasserstoffe liegt, nämlich unter 12O0C. Da die beiden Flüssigkeiten (Wasser und die hochsiedenden Kohlenwasserstoffe) ineinander nicht löslich sind, addiert sich in der Gasphase ihr Dampfdruck, so daß das Sieden bei niedrigerer Temperatur einsetzt, als dem Siedepunkt der einzelnen Flüssigkeiten entspricht. Wählt man dagegen eine Wasserdampftemperatur in der Größenordnung der Siedetemperatur der hochsiedenden Kohlenwasserstoffe, so kommt es zu keiner Was serdanipf adsorptionIn contrast, it was surprisingly found in the experiments on which the invention is based that reactivation succeeds when the temperature of the water vapor is significantly lower than the boiling temperature of the adsorbed high-boiling hydrocarbons, namely below 12O 0 C. Since the two liquids (water and the high-boiling hydrocarbons) are not soluble in each other, their vapor pressure adds up in the gas phase, so that boiling starts at a lower temperature than the boiling point of the individual liquids. If, on the other hand, one chooses a water vapor temperature in the order of magnitude of the boiling temperature of the high-boiling hydrocarbons, there is no water adsorption

1δ und deshalb nicht zu einer Verdrängung der hochsiedenden Kohlenwasserstoffe aus dem Adsorptionsmittel, weil der Dampfdruck des Wassers so hoch liegt, daß eine spontane Verdampfung stattfindet.1δ and therefore not to a displacement of the high-boiling hydrocarbons from the adsorbent, because the vapor pressure of the water is so high that spontaneous evaporation takes place.

Das erfindungsgemäße Verfahren nutzt demgegenüber den Umstand aus, daß bei Temperaturen unter etwa 12O0C der polare Wasserdampf sehr viel stärker adsorbiert wird als der wenig polare Dampf der hochsiedenden Kohlenwasserstoffe. Auf diese Weise werden bei der Behandlung des Adsorptionsmittels mit Wasserdampf von unter 12O0C die hochsiedenden Kohlenwasserstoffe von der Oberfläche des Adsorptionsmittels verdrängt. Die Kohlenwasserstoffe treten hierbei nicht als Flüssigkeit aus dem Adsorptionsmittel aus, sondern verdampfen trotz ihres hohen Siedepunktes von 150 bis 4000C.In contrast, the process of the invention utilizes the fact that is adsorbed much more strongly at temperatures below about 12O 0 C the water vapor polar than the less polar vapor of high boiling hydrocarbons. In this manner the adsorbent with steam at 12O 0 C are the high-boiling hydrocarbons displaced from the surface of the adsorbent in the treatment. The hydrocarbons do not emerge from the adsorbent as a liquid, but rather evaporate despite their high boiling point of 150 to 400 ° C.

Führt man die Dämpfe einem Kondensator zu, so kondensieren dort Wasser und die Γ^hlenwasserstoffe. DurchIf the vapors are fed to a condenser, water and the hydrocarbons condense there. By

321903G321903G

Ι einen Leichtflüssigkeits-Abscheider läßt sich die ölphase (hochsiedende Kohlenwasserstoffe) in sehr reiner Form abtrennen, während die wässrige Phase erneut zur Dampferzeugung eingesetzt werden kann.Ι a light liquid separator can be used Separate the oil phase (high-boiling hydrocarbons) in a very pure form, while the aqueous phase can be used again to generate steam.

Die nach der Desorption zunächst mit Wasser belegte Oberfläche des Adsorptionsmittels kann dann bei höherer Temperatur (z.B. 130 bis 25O0C) entsprechend der Patentanmeldung P 28 52 755.1-43 erneut zur Adsorption von hochsiedenden Kohlenwasserstoffen eingesetzt werden.The after desorption occupied first with water the surface of the adsorbent can be used (130 to 25O 0 C for example) in accordance with patent application P 28 52 755.1-43 again for the adsorption of high-boiling hydrocarbons then at higher temperature.

Zur weiteren Erläuterung der Erfindung diene folgendes Beispiel:The following example serves to further explain the invention:

50 g "Compalox" (ein technisches Aluminiumoxid) wurde 2 Stunden lang bei 18O0C von anhaftendem Wasser befreit, danach mit einer Mineralöl-Fraktion des Siedebereichs 250 bis 3500C präpariert. Beim Durchströmen mit Wasserdampf aus siedendem Wasser unter Normaldruck verdampfte das anhaftende Mineralöl (3,9 g) und konnte praktisch vollständigem Kondensat als ölphase wiedergewonnen werden. Das zurückbleibende Aluminiumoxid war ölfrei, was sich dadurch zeigte, daß es durch aufgebrachtes Wasser vollständig benetzt wurde. Nach anschließendem Ausheizen bei 18O0C konnte das Oxid erneut mit Mineralöl beladen werden.50 g "Compalox" (a commercial alumina) was stripped for 2 hours at 18O 0 C from adhering water, then with a mineral oil fraction of boiling range 250 to 350 0 C prepared. When steam from boiling water flowed through it under normal pressure, the adhering mineral oil (3.9 g) evaporated and practically complete condensate could be recovered as an oil phase. The remaining aluminum oxide was oil-free, which was shown by the fact that it was completely wetted by the applied water. After subsequent heating at 18O 0 C, the oxide could be loaded with oil again.

Claims (5)

Patentansprüche:Patent claims: 1. Verfahren zur Reaktivierung von polaren Adsorptionsmitteln, die mit hochsiedenden Kohlenwasserstoffen (Kp 150 bis 4000C, insbesondere 210 bis 3400C), beladen sind,1. Process for reactivating polar adsorbents which are loaded with high-boiling hydrocarbons (boiling point 150 to 400 ° C., in particular 210 to 340 ° C.), dadurch gekennzeichnet,characterized, daß Wasserdampf mit einer Temperatur von unter 12O0C als Spülmittel verwendet wird.that water vapor with a temperature of below 12O 0 C is used as a rinsing agent. 2. Verfahren nach Anspruch 1, gekennzeichnet durch die Reaktivierung von Adsorptionsmitteln aus technischem Aluminiumoxid, Kieselgel, mineralischer Tonerde oder Eisenoxiden.2. The method according to claim 1, characterized by the reactivation of adsorbents made of technical aluminum oxide, silica gel, mineral Alumina or iron oxides. 3. Verfahren nach Anspruch 1, gekennzeichnet durch die Reaktivierung von Adsorptionsmitteln, die zur Reinigung der Abluft von Trocknern an Druckmaschinen Verwendung finden.3. The method according to claim 1, characterized by the reactivation of adsorbents that clean the exhaust air from dryers on printing machines Find use. 4. Verfahren nach Anspruch 3, gekennzeichnet durch die Reaktivierung von Adsorptionsmitteln, die zur Reinigung der Abluft von Trocknern an Rollenoffset-Druckmaschinen Verwendung finden, wobei diese Abluft hochsiedende Kohlenwasserstoffe (Kp 150 - 4000C, insbesondere 210 - 34O0C) in Konzentrationen von weniger als 30 g/Nm3, insbesondere weniger als 10 g/Nm3, bei Temperaturen zwischen 130 und 2500C,4. The method according to claim 3, characterized by the reactivation of adsorbents for the purification of exhaust from dryers in rotary offset printing machines are used, which exhaust high-boiling hydrocarbons (boiling point 150-400 0 C, in particular 210 - 34O 0 C) in concentrations of less than 30 g / Nm 3 , in particular less than 10 g / Nm 3 , at temperatures between 130 and 250 0 C, insbesonderein particular bei gleichzeitiger Anwesenheit von Wasserdampf in Konzentrationen von weniger als 250 g/Nms (insbesondere 10 - 100 g/Nm3) enthält.with the simultaneous presence of water vapor in concentrations of less than 250 g / Nm s (in particular 10-100 g / Nm 3 ). 5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der mit den hochsiedenden Kohlenwasserstoffen beladene Wasserdampf einem Kondensator zugeführt und die von den Kohlenwasserstoffen befreite wässrige Phase erneut zur Dampferzeugung eingesetzt wird. 5. The method according to claim 1, characterized in that the steam loaded with the high-boiling hydrocarbons is fed to a condenser and the aqueous phase freed from the hydrocarbons is used again for steam generation .
DE19823219036 1982-05-19 1982-05-19 Method for reactivating polar adsorbents Withdrawn DE3219036A1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0224026A1 (en) * 1985-10-31 1987-06-03 Extraktionstechnik Gesellschaft für Anlagenbau m.b.H. Process and apparatus for extracting solids by means of organic solvents without obtaining waste water
US5104545A (en) * 1989-12-15 1992-04-14 Nalco Chemical Company Process for removing water soluble organic compounds from produced water
US5135656A (en) * 1989-12-15 1992-08-04 Nalco Chemical Company Process for removing water soluble organic compounds from produced water

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2852755A1 (en) * 1978-12-06 1980-06-12 Forschungsgesellschaft Fuer Dr Cleaning offset printing machine dryer exhaust gas - by adsorbing high-boiling hydrocarbon(s) on alumina
EP0030921A1 (en) * 1979-12-17 1981-06-24 Ciba-Geigy Ag Process for the separation of nitrobenzene, di- and/or trichlorobenzene from waste vapours
DE3030967A1 (en) * 1980-08-16 1982-03-18 Daimler-Benz Ag, 7000 Stuttgart Rapid desorption of activated charcoal with steam - by heating with satd. steam under pressure and desorption with superheated steam at lower pressure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2852755A1 (en) * 1978-12-06 1980-06-12 Forschungsgesellschaft Fuer Dr Cleaning offset printing machine dryer exhaust gas - by adsorbing high-boiling hydrocarbon(s) on alumina
EP0030921A1 (en) * 1979-12-17 1981-06-24 Ciba-Geigy Ag Process for the separation of nitrobenzene, di- and/or trichlorobenzene from waste vapours
DE3030967A1 (en) * 1980-08-16 1982-03-18 Daimler-Benz Ag, 7000 Stuttgart Rapid desorption of activated charcoal with steam - by heating with satd. steam under pressure and desorption with superheated steam at lower pressure

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DE-Buch: Ullmanns Encyklopädie der technischen Chemie, 4. Aufl., 1981, S.310/311, Bd.6 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0224026A1 (en) * 1985-10-31 1987-06-03 Extraktionstechnik Gesellschaft für Anlagenbau m.b.H. Process and apparatus for extracting solids by means of organic solvents without obtaining waste water
US5104545A (en) * 1989-12-15 1992-04-14 Nalco Chemical Company Process for removing water soluble organic compounds from produced water
US5135656A (en) * 1989-12-15 1992-08-04 Nalco Chemical Company Process for removing water soluble organic compounds from produced water

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