CN105498478B - A kind of method and device of gas phase photolysis-liquid phase photochemical catalytic oxidation purifying volatile organic matter - Google Patents

Abstract

The invention discloses a method and a device for purifying volatile organic compounds by gas-phase photolysis-liquid-phase photocatalytic oxidation. The method of the present invention includes the following steps: S1. Gas-phase photolysis: irradiating volatile organic compounds under ultraviolet light, the photolysis time is less than 1s, and the reaction generates ozone, which forms a mixed gas with the residual gas after photolysis; S2. Liquid-phase photolysis Catalysis: The mixed gas obtained in S1 is subjected to reverse gas-liquid contact with the catalyst slurry, fully reacted, and the mixed gas is converted into CO ₂ and H ₂ O. The invention effectively combines the gas-phase photolysis and the liquid-phase photocatalytic oxidation, and the two steps influence each other, act synergistically, and cannot be separated. The method fundamentally solves the problems of catalyst deactivation caused by the deposition of intermediate products on the surface of gas-solid photocatalysis and the low efficiency of VOCs liquid-phase absorption, and synergizes through various processes such as high-energy ultraviolet photolysis, liquid-phase photocatalysis, and ozone catalytic oxidation. function, reduce the production and accumulation of intermediate products, and realize the efficient and stable degradation of organic waste gas.

Description

A method for purifying volatile organic compounds by gas-phase photolysis-liquid-phase photocatalytic oxidation and device

technical field

The invention belongs to the field of gas pollutant treatment, and in particular relates to a method and a device for purifying volatile organic compounds by gas-phase photolysis-liquid-phase photocatalytic oxidation.

Background technique

With the rapid advancement of urbanization and industrialization in my country, the emission of organic waste gas is increasing, air pollution is becoming more and more serious, and volatile organic compounds (VOCs) in ambient air have increased significantly. Volatile organic compounds (VOCs) are important precursors for the formation of key atmospheric pollutants PM2.5 and _O3 in China, and are easily coupled with other atmospheric pollutants. The new pollutants formed are difficult to decompose naturally, and the damage is more persistent. In addition, it can also participate in photochemical reactions, leading to photochemical smog pollution. Organic waste gas often has a foul smell, which not only stimulates the human body and various sense organs, but also has certain toxicity, causing great harm to human health. The elimination and treatment of organic waste gas is an urgent and important task, which has become a difficult and hot spot in current research.

At present, the widely used processes such as activated carbon adsorption and catalytic combustion still have certain limitations in the actual use process, and it is difficult to meet the increasingly stringent emission regulations and the urgent requirements of the people for improving air quality. If the adsorption method cannot fundamentally eliminate pollutants, the desorption equipment, control system and desorption operation costs are high, and the adsorbent needs to be regenerated or replaced after saturation. Catalytic combustion usually uses noble metals as catalysts, which is costly; there are safety hazards in high-temperature environments and the catalyst is easily deactivated; the concentration of organic waste gas is low and external heat is required to maintain combustion.

Photocatalytic technology has received extensive attention in recent years. It can decompose organic matter under light at room temperature. It has the advantages of strong oxidation ability and mild reaction conditions. It is a relatively promising technology. However, intermediate products such as aldehydes, ketones, acids, and esters are produced during the commonly used gas/solid photocatalytic oxidation of volatile organic compounds, which not only cause secondary pollution, but also cover the catalytic active sites with intermediate products, which will lead to a decrease in catalyst efficiency or even complete inactivation. , and by-products such as ozone remain in the purified gas. These problems become the bottleneck restricting the further development and application of this technology. In order to improve the efficiency of photocatalytic degradation, effectively solve catalyst deactivation and eliminate ozone by-products, it is necessary to reform the gas/solid photocatalytic oxidation system of organic waste gas.

Contents of the invention

The present invention aims at the deficiencies of the organic waste gas treatment technology in the prior art, and proposes a new method for purifying volatile organic compounds by gas-phase photolysis-liquid-phase photocatalysis oxidation on the basis of gas/solid photocatalysis. The method combines gas-phase photolysis and Liquid-phase photocatalysis is effectively combined. By adding a catalyst in the liquid phase, volatile organic compounds enter the liquid phase after photolysis and undergo photocatalytic oxidation, ozone oxidation and other reactions, and finally realize the efficient and stable degradation of organic waste gas.

Another object of the present invention is to provide a device for purifying volatile organic compounds by gas-phase photolysis-liquid-phase photocatalytic oxidation.

The above object of the present invention is achieved through the following technical solutions.

A method for purifying volatile organic compounds by gas-phase photolysis-liquid-phase photocatalytic oxidation, comprising the steps of:

S1. Gas-phase photolysis: irradiate volatile organic compounds under ultraviolet light, the photolysis time is less than 1s, and the reaction generates ozone, which forms a mixed gas with the residual gas after photolysis;

S2. Liquid-phase photocatalysis: The mixed gas obtained in S1 is subjected to reverse gas-liquid contact with the catalyst slurry, fully reacted, and the mixed gas is converted into CO ₂ and H ₂ O;

The catalyst slurry uses water as the medium, adding TiO ₂ or TiO ₂ modified by transition metals Mn, Cu, Co or Ni; wherein, the method of modifying TiO ₂ with transition metals is: using transition metal-containing salts as precursors body, using an impregnation method, mixing its aqueous solution with an aqueous solution of TiO ₂ powder, drying at 80-120°C, and then roasting at 300-550°C to obtain the modified TiO ₂ .

Existing studies have shown that liquid-phase photocatalytic degradation of organic compounds in water has better catalytic stability than gas-solid photocatalytic purification of volatile organic compounds. This may be because the surface of the catalyst in the liquid phase maintains a higher activity due to water washing. Using gas-phase photolysis alone, the degradation efficiency of volatile organic compounds is low, and a large amount of intermediate products are produced, and the direct emission of ozone will cause pollution. However, liquid-phase photocatalysis is used for the treatment of volatile organic compounds in wastewater, and gas volatile organic compounds are mainly Using gas-solid photocatalysis, the combination of the two is to consider that the degradation rate in the liquid phase is higher than that in the gas phase, and some photolysis products are easily soluble in water, and the catalyst in the liquid phase will not be as intermediate as the gas due to water washing. Photocatalytic accumulation on the surface of the catalyst leads to catalyst deactivation.

Volatile organic compounds are first subjected to high-energy ultraviolet photolysis under the action of ultraviolet light, part of the volatile organic compounds are photolyzed, and a certain amount of O ₃ is produced during this process, and the photolysis products of part of the volatile organic compounds that are photolyzed include aldehydes, acids and other intermediate products; the mixed gas after photolysis (including volatile organic compounds, photolysis products, ozone) is in gas-liquid contact with the catalyst slurry. At this time, in addition to transferring to the liquid phase, volatile organic compounds and their products will also be The adsorption of the catalyst slurry accelerates the diffusion into the solution and catalyst solid particles, and then under the action of ultraviolet light, photocatalyst and ozone, volatile organic compounds and their intermediate products undergo photocatalytic oxidation and ozone catalytic oxidation in the liquid phase. Eventually converted to CO ₂ and H ₂ O to discharge. The ozone generated by the ultraviolet photolysis in step S1 can strengthen the subsequent liquid-phase photocatalytic oxidation step and generate more highly active oxygen species, thereby improving the purification efficiency of volatile organic compounds and delaying catalyst deactivation, reducing ozone pollution and realizing ozone utilization , turning harm into benefit; in the process of step S2, due to the existence of degradation, the volatile organic compounds in the liquid phase are continuously degraded, which can effectively promote the transfer of volatile organic compounds to the liquid phase, accelerate the absorption efficiency of the liquid phase, and finally realize Efficient purification of volatile organic compounds.

The invention effectively combines the gas-phase photolysis and the liquid-phase photocatalytic oxidation, and the two steps influence each other, act synergistically, and cannot be separated. The method fundamentally solves the problems of catalyst deactivation caused by the deposition of intermediate products on the surface of gas-solid photocatalysis and the low efficiency of VOCs liquid-phase absorption. function, reduce the production and accumulation of intermediate products, and realize the efficient and stable degradation of organic waste gas. In addition, this method makes full use of ultraviolet energy to provide energy for gas-phase photolysis and liquid-phase photocatalytic oxidation at the same time, and the ozone generated during the gas-phase photolysis process can also enhance the oxidation of VOCs under the action of liquid-phase catalysts.

The catalyst slurry uses water as the medium, and is mixed with titanium dioxide or titanium dioxide modified by transition metals. It has stronger photocatalytic activity than ordinary titanium dioxide, and the catalyst and water can produce more powerful photocatalysts under the excitation of ultraviolet lamps. Oxidative free radicals can improve the oxidation capacity of the system, and can non-selectively decompose refractory pollutants into carbon dioxide and water. It has strong organic waste gas adsorption performance, high ozone utilization efficiency and high photocatalytic activity. The method of the invention has many advantages such as high purification efficiency, mild reaction, simple process, stable performance and economy, and can provide a new efficient and economical solution for the treatment of volatile organic compounds.

Preferably, the catalyst slurry used in S2 is collected and regenerated for use.

Preferably, the transition metal-containing salt is an organic acetate or an inorganic sulfate.

Preferably, the loading amount of the transition metal is 1%-5%.

Preferably, the wavelength of the ultraviolet light in S1 is 185nm.

The present invention also provides a gas-phase photolysis-liquid-phase photocatalysis device based on the above method, including a gas-phase photolysis chamber, a liquid-phase photocatalytic spray tower and a liquid recovery regeneration box. From bottom to top, exhaust gas intake device, filter ball layer, absorption liquid spray device and gas discharge port are arranged in sequence. The tank is connected to the absorption liquid spraying device through a liquid delivery pipeline and a circulating pump; an ultraviolet lamp and a gas-phase photolysis chamber are also arranged in the liquid-phase photocatalytic spray tower, and the ultraviolet lamp in the liquid-phase photocatalytic spray tower is arranged on Between the filter ball layer and the gas discharge port, the end of the absorbing liquid spraying device is provided with several atomizing nozzles, and the gas phase photolysis chamber includes a quartz glass sleeve and an ultraviolet lamp arranged therein. The glass sleeve is respectively connected with the air inlet and the exhaust gas inlet device.

When in use, the catalyst slurry is installed in the liquid recovery and regeneration box, and the catalyst slurry is sprayed from the top of the liquid-phase photocatalytic spray tower through a circulation pump, a liquid delivery pipeline and an absorption liquid spray device. After the exhaust gas is photolyzed through the gas-phase photolysis chamber from the air inlet, it is then passed into the liquid-phase photocatalytic spray tower through the exhaust gas inlet device, and the exhaust gas passing through the filter ball layer is in reverse contact with the spray to perform the liquid-phase photocatalytic oxidation step. Most of the exhaust gas is converted into harmless small molecular compounds, a small part of the intermediate product is transferred to the catalyst for wild species, and the liquid phase photocatalysis is further completely oxidized and degraded, and the catalyst slurry after in-situ synchronous treatment in the liquid recovery regeneration box continues to circulate use. Both the liquid-phase photocatalytic spray tower and the gas-phase photolysis chamber are equipped with ultraviolet lamps, and the ultraviolet lamps in the gas-phase photolysis chamber can not only be used for gas-phase photolysis, but because the gas-phase photolysis chamber is a quartz glass casing, the inner ultraviolet lamp can also It can play a role in the liquid-phase photocatalytic process in the liquid-phase photocatalytic spray tower, thereby reducing the number of ultraviolet lamps and saving energy and high efficiency.

Preferably, the liquid-phase photocatalytic spray tower and the ultraviolet lamp in the gas-phase photolysis chamber are equipped with several vacuum ultraviolet lamps of 185 nm.

Preferably, the ultraviolet lamps in the liquid-phase photocatalytic spray tower are distributed in a ring shape. More preferably, the ultraviolet lamps in the liquid-phase photocatalytic spray tower form a one-stage or multi-stage annular array, that is, one or more layers of rings can be formed in the spray tower, and the outermost ultraviolet lamps are arranged along the inner wall of the spray tower. Evenly distributed.

Preferably, the gas-phase photolysis chamber is provided with several parallel quartz glass sleeves, and the quartz glass sleeves are connected through pipelines, and ultraviolet lamps are respectively arranged in them.

Preferably, the gas-phase photolysis chamber is arranged in an exhaust gas intake device.

Preferably, the absorption liquid spraying device includes several solution branch pipes, and the solution branch pipes are all in communication with the liquid delivery pipeline. More preferably, the solution branch pipe is provided with a branch pipe control valve for controlling the flow rate and atomization effect of the absorption liquid spraying device.

Preferably, the atomizing nozzle adopts a stainless steel fine atomizing nozzle, the atomized particles reach 50-100 μm, and it can also prevent the absorbed liquid from being corroded. According to the type, water solubility, flow rate and concentration of the exhaust gas, preferably, the diameter of the atomizing nozzle is 1-3mm, so as to ensure that the catalyst particles pass through smoothly without clogging. Preferably, the atomizing nozzle is provided with a radial spray pipe, and the spray is sprayed radially, which is more conducive to full contact with the exhaust gas.

Preferably, several gas outlet channels are provided on the exhaust gas inlet device, and the gas outlet channels correspond to the positions of the atomizing nozzles. The air outlet channel faces upwards to the atomizing nozzle, or faces downwards in the same direction as the atomizing nozzle. As an implementation manner, the air outlet channel is an air outlet hole, and the number of the air outlet holes is equal to that of the atomizing nozzle, and the positions correspond to each other. As another embodiment, the exhaust gas inlet device is provided with a trumpet-shaped air guide plate, the opening of which is downward and several layers of air outlet channels are arranged inside.

Preferably, the length of the ultraviolet lamp in the liquid-phase photocatalytic spray tower is 1200mm-1800mm, which is adjusted according to the height of the spray tower to ensure that the interior of the spray tower is irradiated by ultraviolet light in all directions.

Preferably, the filter ball layer is filled with polypropylene filter balls, and the height is 10cm-30cm.

Preferably, a mist eliminator is provided above the absorption liquid spraying device, and the mist eliminator adopts a swirl plate type mist eliminator or a flat plate type mist eliminator.

Preferably, a liquid delivery control valve is provided on the liquid delivery pipeline.

Preferably, an inspection window is provided on the liquid-phase photocatalytic spray tower.

Compared with the prior art, the beneficial effect of the present invention lies in: the present invention combines gas-phase photolysis and liquid-phase photocatalysis, in which gas-phase photolysis not only degrades a part of organic waste gas, but also generates ozone for ozone oxidation to degrade organic waste gas, Improve the degradation rate of organic waste gas. In addition, the intermediate products produced by photolysis are soluble, which is conducive to its further degradation. Liquid-phase photocatalysis overcomes the problem of catalyst deactivation in traditional gas/solid photocatalytic reactions. Due to the washing effect in the liquid phase, the intermediate product is washed away from the surface of the catalyst, making photocatalysis efficient and stable. In addition, strong adsorption in the liquid phase The use of catalysts with high toxicity, high ozone utilization rate and high photocatalytic activity can realize the efficient and stable degradation of volatile organic compounds and organic waste gases, and finally realize the harmlessness of volatile organic compounds. Moreover, the method can be carried out at normal temperature, the reaction process is mild and simple, and has high economic benefits.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the device in Example 3.

Fig. 2 is the air guide plate of the exhaust gas intake device described in embodiment 3.

Figure 3 is the bottom view of the outlet of the air guide plate.

Fig. 4 is a schematic diagram of the overall structure of the device of Example 4.

Legend: 1-liquid phase photocatalytic spray tower; 2-circulation pump; 3-gas phase photolysis chamber; 4-photolysis chamber ultraviolet lamp; 5-liquid delivery pipeline; 6-liquid delivery control valve; 7-inspection window ;8-spray tower UV lamp;9-absorbing liquid spray device;10-atomizing nozzle;11-filter ball layer;12-demister;13-exhaust gas inlet device;14-gas discharge port; Liquid recovery regeneration box; 16-air guide plate.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but the embodiments do not limit the present invention in any form. Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the technical field. Wherein, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical drawings, and should not be construed as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings will be omitted, Enlargement or reduction does not represent the size of the actual product; for those skilled in the art, it is understandable that certain known structures and their descriptions in the drawings may be omitted.

Example 1

A method for purifying volatile organic compounds by gas-phase photolysis-liquid-phase photocatalytic oxidation, comprising the steps of:

S1. The experiment uses a UV lamp to decompose benzene, a volatile organic compound with a concentration of 15-50ppm, at a flow rate of 1L/min and a humidity of 50%, under the irradiation conditions of a UV lamp with a wavelength of 185nm for 0.5s, and the reaction produces ozone. The residual gas after photolysis forms a mixed gas;

S2. Pass the gas-phase photolyzed mixed gas into the liquid-phase photocatalytic spray tower, the catalyst slurry TiO ₂ (P25) is from top to bottom, and the mixed gas is from bottom to top, and the two are in reverse gas-liquid contact. VOCs are finally converted into CO ₂ and H ₂ O through the process of liquid phase absorption, ultraviolet photocatalytic oxidation, and ozone catalytic oxidation under the irradiation of sunlight, and are discharged through the gas outlet, and the concentrations of benzene and CO ₂ are detected at the gas outlet.

After testing, the degradation efficiency of benzene after the reaction is 84%, the mineralization rate is 79%, and the outlet concentration of ozone is less than 100ppm. Both are lower than gas-phase photolysis-liquid-phase photocatalytic purification of volatile organic compounds.

Example 2

A method for purifying volatile organic compounds by gas-phase photolysis-liquid-phase photocatalytic oxidation, comprising the steps of:

S1. The experiment uses a UV lamp to decompose benzene, a volatile organic compound with a concentration of 15~50ppm, at a flow rate of 1L/min and a humidity of 50%, under the conditions of a vacuum UV lamp with a wavelength of 254nm for 0.8s, and the reaction generates ozone , to form a mixed gas with the residual gas after photolysis;

S2. Pass the gas-phase photolyzed mixed gas into the liquid-phase photocatalytic spray tower, and the catalyst slurry is TiO ₂ (P25) modified by Mn (Mn loads are 0.1%, 1%, 3% and 5% respectively. %), the catalyst slurry is from top to bottom, and the mixed gas is from bottom to top. The two are in reverse gas-liquid contact. Under the irradiation of vacuum ultraviolet lamps, they undergo liquid phase absorption, ultraviolet photocatalytic oxidation, and ozone catalytic oxidation. VOCs are finally converted It is CO ₂ and H ₂ O, which are discharged through the gas outlet, and the concentration of benzene and CO ₂ is detected at the gas outlet.

It was tested that when the Mn loading was 0.1%, the optimal degradation efficiency of benzene was 89%, and the mineralization rate was 85%, but the ozone concentration at the outlet was high at this time. To comprehensively investigate the purification effect of photocatalytic oxidation and the concentration of ozone at the outlet, the Mn loading is 1-3% respectively, which is more suitable. When the loading of Mn is 3%, the outlet concentration of ozone is the lowest, which is 50ppm.

Example 3

This embodiment provides a gas phase photolysis-liquid phase photocatalysis device based on the above method, as shown in Figures 1 to 3, comprising a gas phase photolysis chamber 3, a liquid phase photocatalytic spray tower 1 and a liquid recovery regeneration box 15, The liquid-phase photocatalytic spray tower 1 is sequentially provided with an exhaust gas inlet device 13, a filter ball layer 11, an absorption liquid spray device 9, a demister 12 and a gas discharge port 14 from bottom to top. The lower part of the photocatalytic spray tower 1 is connected with the upper part of the liquid recovery and regeneration box 15, and the liquid recovery and regeneration box 15 is connected with the absorption liquid spraying device 9 through the liquid delivery pipeline 5 and the circulation pump 2. The absorption liquid spraying device 9 includes several solution branch pipes, and the solution branch pipes are all communicated with the liquid delivery pipeline 5, and the solution branch pipes are provided with branch control valves for controlling the flow rate of the absorption liquid spraying device. and fog effects. The end of the absorbing liquid spraying device 9 is provided with several stainless steel fine atomizing nozzles 10, the atomized particles reach 50-100 μm, which can also prevent the absorbed liquid from corroding. The exhaust gas inlet device 13 is provided with a trumpet-shaped air guide plate 16, the opening of which is downward and several layers of air outlet channels are arranged inside. The air outlet channel is directed downwards in the same direction as the atomizing nozzle 10 . The filter ball layer 11 is filled with polypropylene filter balls and has a height of 10cm-30cm. The liquid delivery pipeline 5 is provided with a liquid delivery control valve 6 . The liquid-phase photocatalytic spray tower 1 is provided with an inspection window 7 .

More specifically, the exhaust gas intake device 13 includes an intake port, a quartz glass sleeve and an air guiding disc 16 that communicate with each other. The gas-phase photolysis chamber 3 is arranged between the filter ball layer 11 and the liquid recovery regeneration box 15, and is composed of a quartz glass sleeve and several horizontal 185nm photolysis chamber ultraviolet lamps 4 arranged therein. Several 185nm spray tower ultraviolet lamps 8 are vertically arranged in the liquid-phase photocatalytic spray tower 1 , and the spray tower ultraviolet lamps 8 are arranged between the filter ball layer 11 and the gas discharge port 14 . The length of the spray tower ultraviolet lamp 8 in the liquid-phase photocatalytic spray tower 1 is 1200mm-1800mm, which is adjusted according to the height of the spray tower to ensure that all directions in the spray tower are irradiated by ultraviolet light.

During use, the exhaust gas enters the gas phase photolysis chamber 3 through the air inlet of the exhaust gas inlet device 13, and after passing through the gas phase photolysis of the ultraviolet lamp 4 in the photolysis chamber, enters the liquid phase photocatalytic spray tower 1 through the gas guide plate 16 Inside, the liquid-phase photocatalytic oxidation step is carried out in reverse contact with the catalyst slurry spray. Ultraviolet lamps are all provided in the liquid-phase photocatalytic spray tower 1 and the gas-phase photolysis chamber 3, and the photolysis chamber ultraviolet lamp 4 in the gas-phase photolysis chamber 3 can not only be used for gas-phase photolysis, because the gas-phase photolysis chamber 3 is The ultraviolet lamp inside the quartz glass casing can also play a role in the liquid-phase photocatalytic process in the liquid-phase photocatalytic spray tower 1, thereby reducing the number of ultraviolet lamps and saving energy and high efficiency.

Example 4

The gas-phase photolysis-liquid-phase photocatalysis device provided in this embodiment is substantially the same as in Example 3, as shown in Figure 4, the difference is that the quartz glass casing and the photolysis chamber ultraviolet lamp 4 are all vertically arranged, The gas-phase photolysis chamber 3 is provided with two parallel quartz glass casing pipes, which are connected by pipelines. The two quartz glass casing pipes are respectively equipped with photolysis chamber ultraviolet lamps 4, and the quartz glass casing pipes are connected by pipelines. , which are respectively equipped with photolysis chamber ultraviolet lamp 4.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, on the basis of the above description, other changes or changes in different forms can also be made, and it is not necessary and impossible to exhaustively enumerate all the implementation manners here. Any modifications, equivalent replacements and improvements made within the spirit and principle scope of the present invention shall be included in the protection scope of the claims of the present invention.

Claims (9)

1. a kind of method of gas phase photolysis-liquid phase photochemical catalytic oxidation purifying volatile organic matter, which is characterized in that including walking as follows Suddenly：

S1. gas phase photolysis：Volatile organic matter to be irradiated under ultraviolet light conditions, photolysis period ＜ 1s, reaction generates ozone, Gaseous mixture is formed with the residual gas after photodissociation；

S2. liquid phase photocatalysis：The gaseous mixture that S1 is obtained carries out reverse gas-liquid contact with catalyst slurry, in ozone, ultraviolet light It is reacted under the collective effect of catalyst, gaseous mixture is converted into CO₂And H₂O；

The catalyst slurry is added using water as medium through transient metal Mn, Cu, Co or Ni modified TiO₂, wherein transition Metal-modified TiO₂Method be：Using the salt containing transition metal as presoma, using infusion process, by its aqueous solution and TiO₂Powder Aqueous solution mixing after, 80 ~ 120 DEG C drying, then roasted under conditions of 300 ~ 550 DEG C, obtain the modified TiO₂；It is described The load capacity of transition metal is 1% ~ 5%.

2. a kind of gas phase photolysis based on claim 1 the method-liquid phase photocatalysis apparatus, including gas phase photolysis room, liquid phase Photocatalysis spray column and liquids recovery regenerate case, which is characterized in that are set successively from bottom to top in the liquid phase photocatalysis spray column Have gas inlet device, filter bulb layer, absorbing liquid spray equipment and a gas discharge outlet, the lower part of the liquid phase photocatalysis spray column with The top that liquids recovery regenerates case is connected, and the liquids recovery regeneration case is sprayed by liquor charging pipeline, circulating pump and absorbing liquid to be filled It sets connected；Ultraviolet lamp and gas phase photolysis cell, the purple in liquid phase photocatalysis spray column are additionally provided in the liquid phase photocatalysis spray column Outer lamp is set between filter bulb layer and gas discharge outlet, and the end of the absorbing liquid spray equipment is equipped with several atomizers, The gas phase photolysis room includes quartz glass sleeve and sets ultraviolet lamp in the inner, the quartz glass sleeve respectively with air inlet And gas inlet device is connected.

3. the apparatus of claim 2, which is characterized in that the liquid phase photocatalysis spray column, gas phase photolysis are indoor Ultraviolet lamp is equipped with several, is the vacuum UV lamp of 185nm.

4. device according to claim 3, which is characterized in that the ultraviolet lamp in the liquid phase photocatalysis spray column is in a ring Distribution.

5. device according to claim 3, which is characterized in that the gas phase photolysis room is equipped with several stones being mutually parallel English glass bushing is connected between quartz glass sleeve by pipeline, is inside respectively equipped with ultraviolet lamp.

6. the apparatus of claim 2, which is characterized in that the atomizer uses stainless steel precision high-dispersion noz(zle).

7. the apparatus of claim 2, which is characterized in that the gas inlet device is logical equipped with several outlets Road, the outlet passageway are corresponding with the position of the atomizer.

8. the apparatus of claim 2, which is characterized in that the top of the absorbing liquid spray equipment is equipped with demister, The demister uses spiral-flow plate-type demister or Flat defroster.

9. the apparatus of claim 2, which is characterized in that the liquor charging pipeline is equipped with liquor charging control valve.