DE1069574B - Process for the recovery of organic solvents - Google Patents
Process for the recovery of organic solventsInfo
- Publication number
- DE1069574B DE1069574B DENDAT1069574D DE1069574DA DE1069574B DE 1069574 B DE1069574 B DE 1069574B DE NDAT1069574 D DENDAT1069574 D DE NDAT1069574D DE 1069574D A DE1069574D A DE 1069574DA DE 1069574 B DE1069574 B DE 1069574B
- Authority
- DE
- Germany
- Prior art keywords
- inert gas
- adsorption
- solvent
- acid
- adsorbents
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 6
- 239000003960 organic solvent Substances 0.000 title claims description 4
- 238000011084 recovery Methods 0.000 title claims description 4
- 239000002904 solvent Substances 0.000 claims description 13
- 239000003463 adsorbent Substances 0.000 claims description 11
- 238000001179 sorption measurement Methods 0.000 claims description 9
- 239000011261 inert gas Substances 0.000 claims description 8
- 230000008929 regeneration Effects 0.000 claims description 7
- 238000011069 regeneration method Methods 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000003795 desorption Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 150000007513 acids Chemical class 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- QGJOPFRUJISHPQ-NJFSPNSNSA-N carbon disulfide-14c Chemical compound S=[14C]=S QGJOPFRUJISHPQ-NJFSPNSNSA-N 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- 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
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
Description
Verfahren zur Rückgewinnung von organischen Lösemitteln Zur Rückgewinnung von organischen Lösemitteln, die in den Abgasen bzw. der Abluft von chemischen Anlagen enthalten sind, werden bekanntlich feste Adsorbentien, wie Aktivkohle u. ä., verwendet, die das Lösemittel zunächst aufnehmen und bei ihrer anschließenden Regenerierung, etwa durch Ausdämpfen mit Wasserdampf, wieder freigegeben. Aus dem Wasserdampf kann dann das Lösemittel durch Kondensation abgetrennt werden, während das Adsorbens zu seiner vollständigen Regenerierung gegebenenfalls noch einer Trocknung und Kühlung unterzogen wird.Process for the recovery of organic solvents For recovery of organic solvents in the exhaust gases or exhaust air from chemical plants are contained, it is known that solid adsorbents such as activated carbon and the like are used, which initially absorb the solvent and during their subsequent regeneration, for example by evaporation with steam, released again. From the water vapor can then the solvent can be separated by condensation, while the adsorbent for its complete regeneration, optionally drying and cooling is subjected.
Zahlreiche Lösemittel, wie beispielsweise Schwefelkohlenstoff, neigen bei der Regenerierung der Adsorbentien durch Wasserdampf, die in dem Adsorber selbst erfolgt, zu einer Abspaltung von Säuren durch Teilzersetzung. Infolgedessen muß zur Vermeidung von Korrosion die Adsorptionsanlage säuregeschützt ausgeführt werden. Sind große Abluftmengen zu verarbeiten, in denen das Lösemittel in sehr geringer Konzentration vorliegt. so wird die Anlage bei säuregeschützter Ausführung so teuer, daß die Wirtschaftlichkeit nicht mehr gewährleistet ist.Numerous solvents, such as carbon disulfide, tend to during the regeneration of the adsorbents by water vapor in the adsorber itself takes place, to an elimination of acids by partial decomposition. As a result, must To avoid corrosion, the adsorption system is acid-protected. Large amounts of exhaust air are to be processed in which the solvent is very low Concentration is present. the acid-protected version of the system is so expensive, that the profitability is no longer guaranteed.
Um diese Schwierigkeit zu vermeiden, wird nach dem Grundgedanken der Erfindung so verfahren, daß das in nicht säuregeschützten Adsorbern durch ein festes Adsorbens aufgenommene Lösemittel zunächst durch heißes Tnertgas desorbiert wird und das das Lösemittel in wesentlich höherer Konzentration enthaltende Inertgas einer entsprechend kleineren säuregeschützten Adsorptionsanlage zugeführt wird, in der eine erneute Adsorption an festen Adsorbentien, eine Desorption durch Wasserdampf sowie die weitere Regenerierung und die Abtrennung des Lösemittels in der üblichen `'eise erfolgt.In order to avoid this difficulty, the basic idea is that of Invention so proceed that in non-acid-protected adsorbers by a solid Adsorbent absorbed solvent is first desorbed by hot inert gas and the inert gas containing the solvent in a much higher concentration is fed to a correspondingly smaller acid-protected adsorption system, in which a renewed adsorption on solid adsorbents, a desorption by water vapor and the further regeneration and separation of the solvent in the usual way `` 'It is done.
Durch diese zweistufige Arbeitsweise, mit Verwendung von Inertgas für die Überführung des Lösemittels von der einen Steife zur anderen, und entsprechender Anreicherung des Lösemittels in dem Trägergas wird also erreicht, daß nur die Apparatur in der zweiten Stufe säuregeschützt zu sein braucht und hier so kleine Abmessungen erhalten kann, daß die Wirtschaftlichkeit sichergestellt ist.Through this two-stage working method, with the use of inert gas for the transfer of the solvent from one stiffener to the other, and more accordingly Enrichment of the solvent in the carrier gas is thus achieved that only the apparatus needs to be acid-protected in the second stage and here such small dimensions can get that the economy is ensured.
Außerdem «-erden weitgehend Artnaturen eingespart. Während sonst doppelte Ventile mit Zwischenentlüftung erforderlich sind, um Explosionsgefahr durch Vermischen von Lösemittel mit Dampf zu vermeiden, genügen für die großen Adsorber, in denen die Voradsorption zur Erhöhung der Konzentration stattfindet, einfache Absperrventile, dadurch überströmendes Schutzgas bei undichten Ventilen kein'explosives Gemisch entstehen kann. Auch bei der Adsorptionsanlage für die zweite Stufe sind keine Doppelventile erforderlich, weil hier keine Luft zugegen ist und der Adsorber nur abwechselnd mit Schutzgas und mit Dampf gefüllt wird, zumal wenn für die Trocknung und Kühlung der Adsorbentien im Rahmen der Regenerierung nach einem weiteren Merkmal der Erfindung ebenfalls Schutzgas verwendet wird.In addition, species are largely saved. While otherwise double Valves with intermediate venting are required to avoid risk of explosion through mixing Avoiding solvents with steam are sufficient for the large adsorbers in which the pre-adsorption to increase the concentration takes place, simple shut-off valves, As a result, protective gas overflowing in the event of leaky valves is not an explosive mixture can arise. There are also no double valves in the adsorption system for the second stage necessary because there is no air here and the adsorber only alternates is filled with protective gas and with steam, especially when for drying and cooling of the adsorbents as part of the regeneration according to a further feature of the invention protective gas is also used.
Claims (3)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1069574B true DE1069574B (en) | 1959-11-26 |
Family
ID=594665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT1069574D Pending DE1069574B (en) | Process for the recovery of organic solvents |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1069574B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4421532A (en) * | 1980-08-08 | 1983-12-20 | Massimo Sacchetti | Process for removing and recovering volatile organic substances from industrial waste gases |
-
0
- DE DENDAT1069574D patent/DE1069574B/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4421532A (en) * | 1980-08-08 | 1983-12-20 | Massimo Sacchetti | Process for removing and recovering volatile organic substances from industrial waste gases |
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