RU2347743C2 - Ozone and hydrogen peroxide generator - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: present invention can be used for treatment of air and aqueous media. The device comprises: sealed case 1, with inlet and outlet 5, filter 6, for filtering off dust and moisture from oxygen containing gas, and coaxial bottle 2, made from synthetic quartz glass. Coaxial bottle 2 is filled with xenon or a mixture of argon and bromine at 100-400 torr pressure. Case 1 also has an external high voltage electrode 3 and an internal earth electrode 4, in form of stainless steel netting. Radiation in the bottle arises when barrier discharge is initiated when high frequency high voltage pulses are applied to electrodes. Under the effect of radiation in bottle 2, water photolysis takes place and hydrogen peroxide is formed. Radiation from the outer surface of bottle 2 is absorbed by oxygen, with formation of ozone inside case 1.

EFFECT: lower power costs.

1 dwg, 1 ex

Description

The invention relates to devices for producing ozone and hydrogen peroxide, which can be used for processing air and water environments.

A known ozonizer (Russian Patent No. 2097315, CL 01B 13/10, 11/27/97), containing a hermetically sealed enclosure with a reflective inner surface, a low-voltage source of ultraviolet radiation, input and output pipes. The disadvantage of using low-voltage sources of ultraviolet radiation in ozonizers is their low ozone productivity.

The closest analogous set of existing features is the oxidative water generator (Application for invention JP 2005-125180, 05.19.05). An oxidizing water generator, including a closed housing with inlet and outlet nozzles, inside which electrodes are placed, as well as a source of ultraviolet radiation and a piezoelectric element. The disadvantage of using this design is the use of three separate sources for producing ozone and hydrogen peroxide - an ultraviolet lamp, an ultrasonic device, and an electric discharge between the electrodes. The consequence of this is high energy costs and low efficiency, due to the fact that only 10 percent of the ultraviolet radiation from the lamp used is used to generate ozone, and the remaining 90 percent contribute to its destruction.

The difference of the claimed device from the closest analogues is that its source of ultraviolet radiation is a coaxial flask made of synthetic quartz glass, filled with xenon or a mixture of argon with bromine under a pressure of 100-400 Torr.

The invention is illustrated in the drawing, which shows the design of the inventive generator in the context for the simultaneous production of ozone and hydrogen peroxide.

The inventive generator of ozone and hydrogen peroxide consists of a hermetically sealed enclosure 1, equipped with inlet and outlet pipes 5; a filter for cleaning oxygen-containing gas from dust and moisture 6; a coaxial flask 2 made of synthetic quartz glass, filled with xenon or a mixture of argon with bromine under a pressure of 100-400 Torr; external high-voltage electrode made in the form of a grid 3 of stainless steel; internal ground electrode made in the form of a grid 4 of stainless steel.

The formation of ozone from an oxygen-containing gas and hydrogen peroxide from water occurs as follows. Radiation in the flask occurs when a barrier discharge is ignited as a result of applying a high-voltage pulse frequency voltage to the electrodes. Radiation metastable molecules Xe ₂ ^* at a wavelength λ = 172 nm or ArBr ^* at the wavelength λ = 165 nm leads to the formation of oxygen in the generator housing, ozone molecules upon irradiation flowing along the inner surface of the water flasks occurs photolysis of water to form hydrogen peroxide molecules. The cooling of the ozone generator and hydrogen peroxide is carried out by passing water or coolant along the inner surface of the flask.

The drawing explains the principle of operation of the generator for the production of ozone and hydrogen peroxide. When a pulsed high-voltage high-frequency voltage is applied to the electrodes in a gas medium, a barrier discharge is ignited in the bulb. In this case, the electronic levels of Xe or Ar and Br atoms are excited with the subsequent formation of metastable Xe ₂ ^∗ and ArBr ^* molecules, respectively. When these molecules break up, radiation occurs in the vacuum ultraviolet region at a wavelength of λ = 172 nm for Xe ₂ ^∗ and λ = 165 nm for ArBr ^* . This radiation from the outer surface of the flask is effectively absorbed by oxygen flowing in the generator body, with the formation of ozone molecules, and the radiation from the inner surface of the flask acts on water flowing along the inner surface of the flask, resulting in the formation of hydrogen peroxide. In the design shown in the drawing, the outer electrode 3 and the inner electrode 4 are made in the form of stainless steel grids.

The proposed design of the ozone generator and hydrogen peroxide is simple and effective for processing air and water environments even at high pressure.

The possibility of implementing the present invention is confirmed by the following example.

Example 1

In a generator with overall dimensions: length 450 mm, diameter 100 mm, a coaxial flask made of synthetic quartz glass is installed, filled with xenon at a pressure of 250 Torr. Flask dimensions: length 450 mm, outer diameter 52 mm, inner diameter 30 mm. Radiation in the flask occurs when a barrier discharge is ignited as a result of applying a high-voltage pulse frequency voltage to the electrodes. Excitation parameters: sinusoidal excitation pulse, voltage in the discharge gap of 6 kV, frequency of 45 kHz, input power of 300 watts. The radiation output at a wavelength of λ = 172 nm with a sinusoidal excitation pulse is 15%, which corresponds to 45 watts. With this design, the radiation from the bulb is distributed over the inner and outer surfaces in proportion to their area. From the outer surface of the bulb, the radiation power is 34 watts, from the inner - 11 watts. In the generator housing, an oxygen-containing gas, air, is passed along the outer surface of the flask. The flow rate of oxygen-containing gas through the generator body is 500 liters per hour at atmospheric pressure. Under the influence of radiation from the flask, ozone is produced in an oxygen-containing gas. The ozone content in the gas at the outlet of the generator is 13 mg per liter. At this gas flow rate, the ozone productivity is 6.5 g per hour. In the generator housing, water is passed along the inner surface of the bulb. Under the influence of radiation from the flask, hydrogen peroxide is produced in water. The water flow through the inner tube of the flask is 1000 liters per hour at atmospheric pressure. The content of hydrogen peroxide in the water at the outlet of the generator is 2 mg per liter. At a given water flow rate, the productivity of hydrogen peroxide is 2 g per hour.

Claims (1)

Ozone generator and hydrogen peroxide, the design of which includes a hermetically sealed enclosure equipped with inlet and outlet nozzles; filters for cleaning oxygen-containing gas from dust and moisture; external high-voltage electrode made in the form of a stainless steel grid; an internal earth electrode made in the form of a stainless steel grid, and characterized in that its design includes a coaxial flask made of synthetic quartz glass, filled with xenon or a mixture of argon with bromine under a pressure of 100-400 Torr, which is used as a source ultraviolet radiation arising from the ignition of a barrier discharge as a result of applying to the electrodes a pulsed high-voltage high-frequency voltage and leading to the formation of oxygen, finding egosya in the generator housing, ozone molecules and molecules to form hydrogen peroxide as a result of a photolysis by irradiating water flowing along the inner surface of the flask.