DE704705C - Process for the production of phenols from aqueous solutions - Google Patents
Process for the production of phenols from aqueous solutionsInfo
- Publication number
- DE704705C DE704705C DEI62525D DEI0062525D DE704705C DE 704705 C DE704705 C DE 704705C DE I62525 D DEI62525 D DE I62525D DE I0062525 D DEI0062525 D DE I0062525D DE 704705 C DE704705 C DE 704705C
- Authority
- DE
- Germany
- Prior art keywords
- phenols
- aqueous solutions
- production
- adsorption
- coal
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C37/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring
- C07C37/68—Purification; separation; Use of additives, e.g. for stabilisation
- C07C37/70—Purification; separation; Use of additives, e.g. for stabilisation by physical treatment
- C07C37/82—Purification; separation; Use of additives, e.g. for stabilisation by physical treatment by solid-liquid treatment; by chemisorption
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/336—Preparation characterised by gaseous activating agents
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Treating Waste Gases (AREA)
Description
Verfahren zur Gewinnung von Phenolen aus wäßriigen Lösungen Es ist bekannt, Phenole aus ihren wäßrigen Lösungen, wie z. B. aus Abwässern von Koke# reien, Schwel- oder Hydrieranlagen, durch Adsorption mittels aktiver Kohle zu gewinnen. Die praktische Durchführung dieses Verfahrens ist jedoch insofern unbefriedigend, als die Wirkung der hierfür bisher üblichen a,1ztiven Kohlenbeim Durchströmen von phenolhaltigem Wasser durch die Kohleschicht bald nachläßt und die Gesamtbeladungsfähigkeit der Kohlen für Phenol ungenügend erscheint. Selbst solche sonst sehr wirksame Adsorptionskohlen, die beispielsweise für Gas- und Dampfadsorptionszweche hervorragend geeignet sind, zeigen bei der Adsorption von Phenolen aus wäßriger Lösung nur eine mäßige Wirkung. Hochaktive Kieselgele erweisen sich für diesen Zweck als gänzlich wirkungslos. Es wurde nun gefunden, daß mit Wasserdampf oder wasserdampfhaltigen Gasen, wie Flammengasen, z. B. nach dem Verfahren der Palentschrift 463 772 aktivierte Magerkohle, d. i. nicht kokende magere Steinkohle, eine gegenüber den bisher bekannten aktiven Kohlen überragende Adsorptionsfähigkeit für Phenol aus wäßrigen Lösungen besitzt. Dies geht aus den folgenden Vergleichsversuchen hervor.Process for the production of phenols from aqueous solutions It is known to remove phenols from their aqueous solutions, such as. B. from wastewater from coke plants, smoldering or hydrogenation plants, to be won by adsorption using active charcoal. The practical implementation of this process is unsatisfactory insofar as the effect of the previously customary a, 1ztive coals when phenol-containing water flows through the coal layer soon diminishes and the overall loading capacity of the coals for phenol appears inadequate. Even such otherwise very effective adsorption carbons, which are excellently suited, for example, for gas and vapor adsorption purposes, show only a moderate effect in the adsorption of phenols from aqueous solution. Highly active silica gels prove to be completely ineffective for this purpose. It has now been found that with water vapor or gases containing water vapor, such as flame gases, eg. B. lean coal activated according to the procedure of Palentschrift 463 772 , d. i. non-coking lean coal, which has a superior adsorption capacity for phenol from aqueous solutions compared to the previously known active coals. This can be seen from the following comparative tests.
Es wurden jeweils ?,oo cem verschiedener aktiver Kohlen in körniger Form in einem senkrecht stellenden Rohr angewandt, so daß sich eine Schichthöhe von 65 cm ergab. Die Phenollösung, die 3 g Phenol im Liter Wasser enthielt, wurde mit einer Strömungsgeschwindigkeit von 1 1 in der Stunde von unten nach oben durch die Kohleschicht geführt. Es wurde einerseits die 'Menge Phenollösung bestimmt, die bis zu der relativen Sättigung bzw. dein Durchbruchspunkt (d. i. bis zum Auftreten der ersten nachweisbaren Sptir.en., und zwar etwa o,oi gl Plienol iin Liter reini-teii Abwassers) durch die Kohleschicht', geführt werden konnte, und andererseits di.-Men-e Pheiiollös"iii-, die b:s zur absoluten ,;, 1 ittl#un- 2-1 z, der Kohle init Plien( -#I (wo also der Phenolgehalt des abfließenden Wassers dem des einfließenden entsprach) verarbeitet werden konnte.In each case?, Oo cem of different active coals were applied in granular form in a vertical tube, so that a layer height of 65 cm resulted. Containing the phenol solution containing 3 g phenol per liter of water, was passed at a flow rate of 1 1 per hour from the bottom upwards through the coal layer. On the one hand, the amount of phenol solution was determined which up to the relative saturation or the breakthrough point (i.e. up to the appearance of the first detectable strains, namely about o, oi gl plienol in liters of pure wastewater) through the coal layer ', and on the other hand di.-Men-e Pheiiollös "iii-, the b: s to the absolute,;, 1 ittl # un- 2-1 z, the coal init plien (- # I ( where the phenol content of the outflowing water corresponded to that of the inflowing water) could be processed.
Außer diesen Werten ist im folgenden noch 'die Benzoladsorptionszahl (Benzolzahl) an-7' gc"el)eii, d. i. die Menge Benzol in Gramm, die von ioo cciii der Kohle aus einem mit Benzoldampf gesättigten Gasstrom bei 2o' aufgen0111111en wird.In addition to these values, the following is the benzene adsorption number (benzene number) an-7 'gc "el) eii, i.e. the amount of benzene in grams which is absorbed by 100 cciii of the coal from a gas stream saturated with benzene vapor at 2o' .
I
Die mit Plieliol beladene Kohle kann nach der Trocknung in bekannter Weise durch Extraktion mit einem organischen Lösungsmittel, z. B. Benzol oder Benzin, oder vorteilhaft init flüssigem Ainnioniak unter Druck regeneriert 2n werden. Zweckmäßig schaltet man bei der Reinigung von Abwässern vor die für die Phenoladsorption bestimmte Schicht aktiver Kohle eine kleinere, nur selten zu erneuernde Schicht eines porösen Stofies, der keine bedeutende Aktivität zu besitzen braucht, z. B. Koks o. dgl., um iiii Phenolwasser etwa vorhandene Teerspuren oder andere Schmutzstoffe zu entfernen.The charcoal loaded with Plieliol can after drying in a known Way by extraction with an organic solvent, e.g. B. benzene or gasoline, or, advantageously, can be regenerated with liquid ammonia under pressure. Appropriate when cleaning wastewater, one switches before the one intended for phenol adsorption Layer of active carbon is a smaller layer of a porous one that can only rarely be renewed Stofies that need not have significant activity, e.g. B. coke or the like, to remove any traces of tar or other contaminants present in phenolic water.
Bei schwefelwasserstoffhaltigen Abwässern ist es angebracht, die Luft aus der Kohleschicht vor Beginn des Durchflusses durch Wasser zu verdrängen, um eine Abscheidung von Schwefel in der Kohle zu verhindern.In the case of wastewater containing hydrogen sulphide, it is advisable to ventilate the air to displace from the carbon layer before the start of the flow through water in order to to prevent the deposition of sulfur in the coal.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEI62525D DE704705C (en) | 1938-09-25 | 1938-09-25 | Process for the production of phenols from aqueous solutions |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEI62525D DE704705C (en) | 1938-09-25 | 1938-09-25 | Process for the production of phenols from aqueous solutions |
Publications (1)
Publication Number | Publication Date |
---|---|
DE704705C true DE704705C (en) | 1941-04-04 |
Family
ID=7195706
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEI62525D Expired DE704705C (en) | 1938-09-25 | 1938-09-25 | Process for the production of phenols from aqueous solutions |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE704705C (en) |
-
1938
- 1938-09-25 DE DEI62525D patent/DE704705C/en not_active Expired
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