EP0668846A1 - Process and device for carrying out continuous photoreactions in a liquid phase - Google Patents
Process and device for carrying out continuous photoreactions in a liquid phaseInfo
- Publication number
- EP0668846A1 EP0668846A1 EP94926906A EP94926906A EP0668846A1 EP 0668846 A1 EP0668846 A1 EP 0668846A1 EP 94926906 A EP94926906 A EP 94926906A EP 94926906 A EP94926906 A EP 94926906A EP 0668846 A1 EP0668846 A1 EP 0668846A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- substance
- catalyst
- wall
- tube
- vessel
- 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- Withdrawn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
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000007791 liquid phase Substances 0.000 title claims description 9
- 239000000126 substance Substances 0.000 claims abstract description 32
- 239000003054 catalyst Substances 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 17
- 230000005855 radiation Effects 0.000 claims description 9
- 230000005484 gravity Effects 0.000 claims description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 6
- 230000000737 periodic effect Effects 0.000 claims description 5
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 4
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 3
- 239000003622 immobilized catalyst Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000012071 phase Substances 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical group 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 229910000484 niobium oxide Inorganic materials 0.000 claims 3
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 claims 3
- 229910001928 zirconium oxide Inorganic materials 0.000 claims 3
- 239000003651 drinking water Substances 0.000 abstract description 3
- 235000020188 drinking water Nutrition 0.000 abstract description 3
- 150000008280 chlorinated hydrocarbons Chemical class 0.000 abstract 1
- 230000003750 conditioning effect Effects 0.000 abstract 1
- 230000001737 promoting effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 241001131696 Eurystomus Species 0.000 description 21
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 10
- 239000010408 film Substances 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 239000002609 medium Substances 0.000 description 4
- 150000002896 organic halogen compounds Chemical class 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 239000012736 aqueous medium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- GOYDNIKZWGIXJT-UHFFFAOYSA-N 1,2-difluorobenzene Chemical compound FC1=CC=CC=C1F GOYDNIKZWGIXJT-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 239000010955 niobium Substances 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000006862 quantum yield reaction Methods 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 229910021642 ultra pure water Inorganic materials 0.000 description 2
- 239000012498 ultrapure water Substances 0.000 description 2
- DEWLEGDTCGBNGU-UHFFFAOYSA-N 1,3-dichloropropan-2-ol Chemical compound ClCC(O)CCl DEWLEGDTCGBNGU-UHFFFAOYSA-N 0.000 description 1
- HFHFGHLXUCOHLN-UHFFFAOYSA-N 2-fluorophenol Chemical compound OC1=CC=CC=C1F HFHFGHLXUCOHLN-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011552 falling film Substances 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000011872 intimate mixture Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000004045 organic chlorine compounds Chemical class 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- -1 peroxide sulfate Chemical class 0.000 description 1
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
- C02F1/325—Irradiation devices or lamp constructions
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/32—Details relating to UV-irradiation devices
- C02F2201/322—Lamp arrangement
- C02F2201/3223—Single elongated lamp located on the central axis of a turbular reactor
Definitions
- the invention relates to a ner driving and a device for the continuous implementation of photoreactions in the liquid phase, in particular for the photochemical cleaning of CHC, CFC and CFC-containing media as well as for the treatment of drinking water and ultrapure water.
- photoreactions can be used to convert chemical compounds.
- photoreactions are used to remove organic chlorine compounds from wastewater (D. Bockelmann and D. Bahnemann; presentation book of the photochemistry GdCH specialist group conference on photocatalytic degradation of halogenated hydrocarbons on semiconductors, Duisburg 1989).
- the arrangements used for this are characterized in that photo-immersion lamps are used, the effectiveness of which is greatly restricted by the layer thickness and cloudiness of the medium.
- This disadvantage is particularly evident when catalysts, especially titanium dioxide in powder form, are added to the reaction mixture [M. Bideau, B. Claudel, L. Faure and H. Kazouan; J. Photobiol. A. 67 (1992) 337].
- This arrangement has two disadvantages. The penetration depth of the radiation, and thus the space-time yield, is significantly restricted and the catalyst used must be removed after the reaction. At the same time, a gas produced separately may have to be introduced into the mixture to complete the reaction.
- the invention is therefore based on the object of finding a possibility for the continuous implementation of photoreactions in the liquid phase which increases the quantum yield in particular in cloudy, colored or UV-absorbing liquid media.
- the object is achieved in a process for the continuous implementation of photoreactions in the liquid phase, in which a substance to be converted is distributed on the inner wall of a rotationally symmetrical vessel and illuminated by a radiation source protruding into the vessel, in that the substance due to the alignment of the axis of symmetry of the vessel towards the Gravity is drained off on the wall of the vessel, the draining substance is formed by means of distributor elements, which are guided essentially continuously along the entire wall of the vessel, essentially parallel to the wall of the vessel and with a distance from the wall of the vessel that is different in each point from zero, to a uniform, thin film of substance and that the substance film is exposed at least over the area formed uniformly by the distributor elements by means of a long rod-shaped photolamp of corresponding length directly through the gas atmosphere located in the interior of the vessel.
- the substance is preferably rolled into a uniform film transversely to the longitudinal direction of the tube by means of rotating distributor rollers on the inner wall of an upright tube, the inner wall being exposed uniformly and directly from the tube axis by means of a rod-shaped photo lamp.
- the layer thickness of the liquid is expediently set finer by the speed of rotation of the distributor rollers.
- Reaction-supporting gases such as e.g. Air or oxygen that forms ozone as a result of intense lighting.
- the object of the invention is achieved in a device for the continuous implementation of photoreactions in the liquid phase, consisting of a rotationally symmetrical vessel through which the substance is passed, a radiation source located on the axis of symmetry and a rotor moving about the axis of symmetry, in that the Vessel is a vertically standing tube with an inlet at the top and an outlet at the bottom, with a substance to be converted running off on the inner wall of the tube due to the action of gravity, the rotor being cage-shaped with at least two rods oriented parallel to the inner wall of the tube, on which distributor rollers are rotatably mounted are formed, wherein the rods with the distributor rollers leave a defined distance from the inner wall of the tube for the formation of a uniform film of the substance to be reacted, and the radiation source is a rod-shaped photo lamp which is arranged centrally along the axis of symmetry for uniform exposure of the substance film, which occurs exclusively through the gas atmosphere in the interior of the tube.
- the inner wall of the tube and / or the distributor rollers are coated with a catalyst.
- the catalyst is expediently applied to surface regions of the distributor rollers with a smaller radius, the radius being smaller at least by the average thickness of the catalyst layer.
- the catalyst is preferably a metal oxide from elements of the 3rd to 5th subgroup of the periodic table, preferably titanium, zircon or niobium and is advantageously produced on the mother metal by the PL ASMOCER process, as described, for example, in: EAST conference report 1992 in Schissebisch Gmünd (12713 November 1992), published in August 1993, EG Leuze Verlag, Saulgau / kind, pp.
- the basic idea of the invention lies in the idea of making photoreactions in liquid substances, in particular in cloudy media, more effective by uniformly exposing defined amounts of liquid. This is done according to the invention by producing a uniform liquid film of a defined thickness on a vessel wall using the eaves movement due to gravity and a superimposed wiper movement essentially perpendicular to it.
- A. The tubular shape of the reaction vessel with a central rod-shaped photo lamp and rotating distributor rollers on the tube wall leads to the technical implementation of the method according to the invention. With the technical solution according to the invention it is possible to decisively increase the quantum yield in the case of continuous photoreactions, in particular in cloudy, colored or UV-absorbing liquids.
- Fig. 1 shows an inventive device for implementing the method
- FIG. 2 shows an enlarged detail from FIG. 1 in the form of a catalyst-coated wiper roller 4
- the essential steps of the method according to the invention consist of a) the draining of the substance intended for the reaction in the liquid phase (hereinafter referred to as liquid) on a vertical vessel wall due to the action of gravity, b) the distribution of the liquid evenly by means of distributor elements essentially transversely to Eaves direction to a film of selectable but constant thickness and c) the simultaneous and uniform exposure of the liquid film on the vessel wall.
- the device consists of a tube 2, which in this case is formed by the inner wall of a double-jacket vessel 5 and has an inner diameter of 75 mm and a length of approximately 200 mm.
- the substance to be reacted drips down on the inner wall of the tube.
- the viscosity of the liquid must also be taken into account for the difference.
- the rod-shaped photolamp 3 (with a preferred working wavelength range from 120 to 480 nm) is located in the center of the tube 2, separated by a gas atmosphere, preferably air.
- a suitably used catalyst is immobilized on the inner wall of the tube 2 (with a surface area of 442 cm 2 ) and on the distributor rollers 4 (with a surface area of 198 cm 2 ) rotating on the rods 1. If necessary, distributor rollers 4 and / or tube 2 are themselves produced from the catalyst.
- the distributor rollers 4 In order to reduce the mechanical wear of the catalyst layer, if it is applied to the distributor rollers 4, it proves to be expedient to design the distributor rollers 4 in accordance with the cross section shown as a detail in FIG. 2.
- the wiper roller 4 has surface areas which are reduced by at least the average thickness of the catalyst layer 42 compared to the remaining radius.
- the distributor rollers 4 are made of a metal from subgroup 3 to 5 of the periodic table of the elements, preferably titanium, zirconium or niobium, the Generate catalyst on the mother metal 41, for example according to the PLASMOCER method, as stated above, as a homogeneous and uniform oxide layer.
- the Generate catalyst on the mother metal 41 for example according to the PLASMOCER method, as stated above, as a homogeneous and uniform oxide layer.
- the residence time of the medium in the tube 2 can be varied by the speed of rotation of the rotor with the distributor rollers 4.
- the above-mentioned design of the tube 2 as a double-jacket vessel 5 also allows the device to be tempered.
- Oxidizing agent possible inside the tube 2, the operation with protective gas necessitating the use of oxidizing reactants.
- Purity levels of the liquid can be achieved.
- the device makes it possible to utilize photoreactions taking place in the gas phase in that the product formed, for example ozone, can react directly with the liquid and - due to the mode of action of the distributor rollers 4 - an intimate mixture of the gas phase with the liquid takes place.
- Example 3 1 l of an aqueous medium, consisting of a halogenated compound in the form of fluorinated aromatics, preferably difluorobenzene, in a concentration of at most 3 ⁇ 10 -3 mol / 1, with the addition of 2% hydrogen peroxide, are reacted within 30 minutes on the device described Distribution rollers 4 are used as catalyst as in Example 1. No organic halogen compound can be detected in the product.
- a halogenated compound in the form of fluorinated aromatics preferably difluorobenzene
- aqueous medium consisting of a halogenated compound, preferably trichlorethylene in a concentration of at most 2 ⁇ 10 -3 mol / l, is reacted within 30 minutes on the apparatus described without the addition of hydrogen peroxide.
- Distribution rollers are used as the catalyst 4 as used in Example 1.
- Organic halogen compound can no longer be detected in the product.
- aqueous solution consisting of a halogenated compound in the form of fluorinated aromatics, preferably difluorobenzene or fluorophenol, is used in a concentration of at most 2 ⁇ 10 ° mol / 1, without addition of hydrogen peroxide, within 30 minutes on the device described around. No organic halogen compound can be detected in the product.
Landscapes
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Catalysts (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4331071 | 1993-09-13 | ||
DE19934331071 DE4331071C2 (en) | 1993-09-13 | 1993-09-13 | Method and device for the continuous implementation of photoreactions in the liquid phase |
PCT/EP1994/002862 WO1995007860A1 (en) | 1993-09-13 | 1994-08-30 | Process and device for carrying out continuous photoreactions in a liquid phase |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0668846A1 true EP0668846A1 (en) | 1995-08-30 |
Family
ID=6497611
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94926906A Withdrawn EP0668846A1 (en) | 1993-09-13 | 1994-08-30 | Process and device for carrying out continuous photoreactions in a liquid phase |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0668846A1 (en) |
DE (1) | DE4331071C2 (en) |
WO (1) | WO1995007860A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2318264A (en) * | 1996-10-14 | 1998-04-15 | Malcolm James Robins | Liquid steriliser |
DE19813544C2 (en) * | 1998-03-27 | 2001-02-08 | Hansa Metallwerke Ag | Device for sterilizing water |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2363114B2 (en) * | 1973-12-19 | 1978-06-15 | Graentzel, Alfred, 7500 Karlsruhe | Device for the continuous implementation of photochemical reactions |
DE2733344C2 (en) * | 1977-07-23 | 1979-07-12 | Alfred 7500 Karlsruhe Graentzel | Apparatus for irradiating flowable media to achieve chemical reactions or reaction products |
-
1993
- 1993-09-13 DE DE19934331071 patent/DE4331071C2/en not_active Expired - Fee Related
-
1994
- 1994-08-30 EP EP94926906A patent/EP0668846A1/en not_active Withdrawn
- 1994-08-30 WO PCT/EP1994/002862 patent/WO1995007860A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9507860A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE4331071A1 (en) | 1995-03-16 |
DE4331071C2 (en) | 1997-02-06 |
WO1995007860A1 (en) | 1995-03-23 |
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Legal Events
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