RU8700U1 - DEVICE FOR PHOTOCHEMICAL DECOMPOSITION OF DISSOLVED ORGANIC SUBSTANCES IN AQUEOUS MEDIA - Google Patents

Abstract

A device for the photochemical decomposition of dissolved organic substances in aqueous media, comprising a hollow body with a cover and a low-pressure mercury arc lamp placed inside it for U-shaped photochemical processes, on the outer surface of the cylinder of which from the side of the opposite working zone a mirror-reflective layer of highly pure aluminum is applied in the form of an open cylinder, and in the upper cover of the device’s case there are slots for placement in one row of a set of N - the number of sample cells, each and of which has a cylindrical shape, and the outer diameter of the cuvette is associated with the geometric dimensions of the lamp so that the required number of cuvettes can be placed inside the working area of the U-shaped part of the lamp, while the cuvettes and the lamp balloon, the length of which is selected depending on the required placement the number of cuvettes made of thin-walled tubular quartz glass of high purity, transparent for the emission of resonance mercury lines of 185 and 254 nm, in addition, each cuvette is equipped with agitators consisting of ferromagnetic blades and rotary disks, each stirrer blade, which is a steel rod hermetically sealed in a cylindrical glass ampoule, with a length shorter than the inner diameter of the cell, is placed inside each cell on its bottom, and each ferromagnetic disk of the mixer is equipped with two cylindrical constants magnets mounted on its upper surface facing the bottom of the cuvette, the magnetic axes of these magnets being diametrically and the magnetization vectors of each pair of magnets

Description

Photochemical Decomposition Device

soluble organic substances in

aquatic environments.

The utility model relates to devices for processing (decomposition) of liquid solutions of organic substances by hard ultraviolet radiation and is intended for performing the operations of sample preparation of liquid media in chemical and physico-chemical methods for analysis of the content of toxic metals in atomic absorption, voltammetric, spectrophotometric and ionometric analyzes.

A device for disinfecting water with ultraviolet radiation is known; certificate of the Russian Federation; useful model No. 1994, IPC6 C02F1 / 31, bull. PMPOMM, 1996., containing a housing with water inlets and outlets and a quartz low-pressure bactericidal lamp. The casing is sabzhen of the upper and lower covers with sealing gaskets, and the quartz gas-discharge bactericidal low-pressure lamp is made in a U-shape and fixed in the center of the upper cover.

The cylinder of a quartz gas-discharge bactericidal lamp of low pressure of this device is made of industrial quartz glass, opaque in the radiation region of the first resonant mercury line with a wavelength of 185 im. The absence of this hard component of ultraviolet radiation leads to low decomposition efficiency of dissolved organic matter. In addition, the ultraviolet radiation of this lamp is not fully used due to its scattering into the surrounding space.

A device for the photochemical decomposition of dissolved organic substances in aqueous media is known, a positive decision on application No. 9711145320 (012250) dated 07/08/97, selected as a prototype, containing a hollow body with a lid and a mercury arc lamp of low pressure for photochemical processes U-shaped

MPKb C02F1 / 32X

forms, on the outer surface of the cylinder of which, from the side of the anti-p.j4efi zone, a specular reflection of Go aluminum 2 is applied, an open cylinder shape, and in the upper cortex of the device there are nests for placement in one row of a set of N number of sample cuvettes, each of which has a cylindrical shape, the outer diameter of the cuvette being associated with the geometric dimensions of the lamp so that the required number of cuvettes can be placed inside the working area of the U-shaped part of the lamp, while the cuvettes and balloons The ampoules, the length of which is selected depending on the number of cuvettes required for placement, are made of thin-walled tubular quartz glass of high degree of purity, transparent for the emission of piyra resonance lines of 185 nm and 254 of them, in addition, each cuvette is equipped with blenders consisting of ferromagnetic blades and drives driven in rotation, each blade of the meshed being a steel rod hermetically sealed in a cylindrical glass ampoule with a length shorter than the internal diameter of the cell, placed inside each cell to its bottom, and each ferromagnetic disk of the mixer is equipped with two cylindrical permanent magnets mounted on its upper surface facing the bottom of the cell, the magnetic axes of these magnets being diametrically opposed, and the magnetization vectors of each of the magnet pairs oriented opposite, the axis of reapplication of ferromagnetic disks coincide with the axis of symmetry of the cells, while the ferromagnetic disks are mounted on the shafts of electric motors connected by an electric circuit to the power supply unit and to control the speed of rotation of the electric electric motors, and the above lamp is connected by an electric circuit to the power supply unit of this lamp.

In the specified device, the thermal regime of the lamp is not optimized.

The temperature of the ambient / burning cross-section does not allow the lamp to automatically set the optimum mode with the maximum output of the photochemically active part of the UV radiation (185 and 254 nm) in the range of the ambient temperature q qflbi from 10 to 30 ° С.

The objective of the utility model is the ability to automatically control the thermal regime of the lamp, maintaining it at the optimum level when the ambient temperature changes, providing the maximum yield of the photochemically active part of the UV radiation and increasing the productivity of the sample preparation process.

A device for the photochemical decomposition of dissolved organic substances in aqueous media, comprising a hollow body with a cover and a low-pressure mercury arc lamp placed inside it for U-shaped photochemical processes, on the outer surface of the cylinder of which a mirror-reflective layer of highly pure aluminum is applied from the side of the opposite working area in the form of an open cylinder, and in the upper cover of the device case there are slots for placement in one row of a set of N-number sample cells, each of which has a cylindrical shape, and the outer diameter of the cuvette is associated with the geometric dimensions of the lamp so that the required number of cuvettes can be placed inside the working area of the i-shaped part of the lamp, while the cuvettes and the lamp bulb, the length of which is selected depending on the number of cuvettes needed to accommodate made of thin-walled tubular quartz glass of high purity, transparent for resonance mercury lines of 185 nm and 254 nm, in addition, each cuvette is equipped with agitators consisting of ferromagnet rotary blades and disks, each stirrer blade, which is a steel rod hermetically sealed in a cylindrical glass ampoule, with a length shorter than the inner diameter of the cell, is placed inside each cell on its bottom, and each ferromagnetic disk of the mixer is equipped with two cylindrical permanent magnets, fixed on its upper surface, facing the bottom of the cell, the magnetic axes of these magnets being diametrically located, and the magnetization vectors of each pair of magnets being oriented Well, the axes of the ferromagnetic disks coincide with the symmetry axes of the cuvettes, while the ferromagnetic ones are mounted on the motor shafts connected by an electric circuit to the power supply and speed control unit of the electric motors, and the indicated lamp is connected by an electric circuit to the power supply unit of this lamp, according to the utility model additionally equipped with holo; a wand containing a heat sink, coacting with part of the cylinder of a low-pressure mercury arc lamp for photochemical processes of a U-shaped us, and the cooler connected to the heat sink, and introduced electronic thermal mode lamp control unit, soda | 1zhaschy sensor, usganovl zhny on the heat sink, soedinshny electrical wires to the power supply and regulation Sasorov rotation motors.

Due to the use in the device of the refrigerator with an adjustable cooling rate, the part of the lamp cylinder in contact with the heat sink of the refrigerator becomes a condensation zone of mercury vapor (cold zone of the lamp) with a stabilized temperature Tx, which provides optimal discharge conditions for the generation of resonant mercury lines in the lamp.

The control of the fan (cooling rate) depending on the ambient temperature ensures that the temperature of the cold zone of the lamp, which corresponds to the optimal temperature

Figure 1 shows a schematic diagram of a device.

Figure 2 shows a low-pressure mercury arc lamp for U-shaped photochemical processes, with cuvettes placed inside its working area, aphid D-external diameter of the cuvette, / s / - width of the working area of the U-shaped part of the lamp; Sh / y.

in FIG. a refrigerator is in contact with a cylinder element of a low-pressure mercury arc lamp for the U-shaped photochemical processes.

Figure 4 shows the electric circuit (device), where 1 is a power supply and re17Shfovaniya speed of rotation of the electric motors M; II- power supply lamp ultraviolet DRFH-203U.

Figure 5 shows the electrical circuit of the thermal control unit of the lamp, which is a threshold device.

A device for the photochemical decomposition of dissolved organic substances in water feeds (Fig. 1) consists of a hollow body 1, the inner part of which is divided into two cavities by a horizontal continuous partition 2 made of thin-walled non-magnetic material (aluminum alloy). The upper cavity of the device housing contains a low-pressure mercury arc lamp 3 for U-shaped photochemical processes, the outer surface of the cylinder of which from the side opposite to the irradiation working zone is covered with a reflective layer 4 in the form of an open cylinder (figure 2), three cuvettes 5, which are quartz cylindrical glasses, on the bottom of which ferromagnetic blades of 6 blenders are laid for moving the sample, representing steel rods hermetically sealed in cylindrical glass ampoules . Three sockets 8 for mounting the cuvette 5 are made in the upper housing 7 of the device housing. In addition, in the upper cavity of the device housing there is a refrigerator containing a heat sink 9 (FIG. 2, FIG. 3), communicating with a part of the lamp bulb 3 and having a groove, which to ensure tight thermal contact, it repeats the shape of the part of the lamp bulb 3 at the point of contact, while the contact surface does not extend beyond the mirrored part of the lamp bulb. The heat sink 9 extends beyond the wall of the housing 1 of the device by 3-5 mm, while between the planes of the heat sink 9 and the wall of the housing 1 of the device there is an air gap of 1-2 mm. 3 side opposite from the part of the lamp bulb

the heat sink 9 in all plane is in contact with the radiator 10 containing the fan 51, so that a tight thermal contact is created. The temperature sensor 11 is attached through an insulating pad 12, for example, a mica liner, to the upper horizontal plane of the heat sink. The radiator 10 is mounted on the side wall of the device casing 1 through heat-insulating spacers 13 made, for example, of PCB, so that between 3-5 the casing of the casing 1 and the radiator 10, a gap of 3-5 mm of the day of eliminating the thermal effect of the heated wall of the casing 1 on the radiator 10 is formed.

A stirrer drive mechanism is located in the cavity of the chamber with three electric motors 14, on the shaft of each of which there is a ferromagiite disk 15. The axis of rotation of the ferromagnetic disks 15 of the agitators coincide with the symmetry axes of the cells 5. On the upper surface of each disk 15 of the mixer facing the cell 5 are fixed two cylindrical permanent magnets 16. The lower cavity of the device housing also contains a power supply and regulation unit 17 for the rotation speed of the electric motors, a starter 18 and a choke 19 for powering the lamp 3, an electronic unit 20 thermal control mode lamp 3 which electric wires connected to the temperature sensor 11.

The handle 21 for controlling the speed of rotation of the electric motors is mounted on the front panel of the device.

The device uses a lamp DRFH-203U, the outer surface of the cylinder of which from the side of the opposite working area is covered with a specularly reflecting layer of highly pure aluminum in the form of an open cilihidra.

The cuvettes 5 are cylindrical glasses made of finely rubbed quartz glass of high purity of the KU-1 or KU-2 type, 50 mm high, with an outer diameter (D) of 28 mm and a wall thickness of not more than 1 mm.

Each blade 6 of the mixer, placed on the bottom of the cuvette 5, is a ferromagnetic rod made of steel of the grade St.Z. 22 mm long and 1 mm in diameter, hermetically sealed in a 25 mm glass cylindrical ampoule. The length of the blade 6 of the mixer is less than the inner diameter of the cell 5.

Ferromagnetic disks of 15 mixers are made of steel

The cylindrical permanent magnets 16 are made of the hard-alloy alloy ANKOZ. The diameter of each magnet is 9 mm, its height (2.5 mm. The magnetic axes of these magitites are located diametrically at a distance of 11 mm from the axis of rotation of the disks 15.

The distance between the bottom of the cell and the magnets does not exceed 2.5-3 mm.

To power the lamp DRFH-203U, the starter 80С220 and the inductor 1I22 are used.

The movement of the irradiated samples is ensured by the electric motor 14type DP39-0,1-2.

The handle 21 for controlling the speed of rotation is connected to the axis of the slider of the potentiometer R (Fig. 4);

The heat sink 9 of the refrigerator is made of a material with a high heat (MirpbiBOOTocibk), for example honey. The bottom of the body of the flange remover is vybrsh within 12-26 mm.

The cooler uses a cooler 10 of type Cooler for 586 CPU with a fan.

As a temperature sensor 11, a transformer KT 814B is used (Fig. 5).

When the device is turned on, a U-shaped low-pressure mercury arc lamp 3 is ignited, which ensures irradiation of the samples with hard ultraviolet radiation, as well as electric motors 14, which rotate the ferromagnet disks 15 with cylindrical permanent magnets attached to them 16. The rotational movement of the permanent magnets 16 is transmitted to the fer blades of 6 mixers in ditches 5. Rotating, ferromagnetic blades of 6 mixers mix the irradiated sample, providing uniform decomposition of organic substances of the entire volume of the samples. Using 21 regulation of the rotation speed of the electric motors, the necessary speed of rotation of the mixers (their disks and blades) is established and thereby provide the necessary intensity of movement of samples of various viscosities.

During operation of the mercury arc lamp 3, the space of the housing is heated, “but one step leads to Haipajt bhshona daipy to a temperature higher than optimal and a decrease in the yield of UV radiation. Exceeding the temperature above the optimal temperature triggers the temperature sensor 11 (changing the collector current of the transistor VT1, Fig. 5) of the threshold device, which will trigger the key (VT2, Fig. 5) and turning on the radiator fan 10 of the device’s refrigerator. The operation of the fan of the radiator 10 of the refrigerator causes the cooling of the heat sink 9, which in turn leads to a gradual cooling of the part of the cylinder of the lamp 3 at the point of contact with the heat sink 9 to the optimum temperature. At the same time, the cooling of the heat sink 9 causes cooling of the temperature sensor And (VT1, Fig. 5) and a decrease in its collector current, while the VT2 key is locked (Fig. 5) and the fan of the cooler 10 is turned off, after which a new cycle of heating of the heat sink 9 and the temperature sensor 11 to its next operation. Setting the electronic control unit for the thermal regime of the lamp 3 to the optimum value of the temperature of the cold zone of the lamp bulb is carried out using podgroyechny resistor R3 (figure 5). Thus, the cyclic switching on-off mode of the vesilator ensures that the temperature of the cold zone of the lamp cylinder is maintained at the optimum temperature and high lamp efficiency in the photoactive part of the UV radiation.

Claims (1)

A device for the photochemical decomposition of dissolved organic substances in aqueous media, comprising a hollow body with a cover and a low-pressure mercury arc lamp placed inside it for U-shaped photochemical processes, on the outer surface of the cylinder of which from the side of the opposite working zone a mirror-reflective layer of highly pure aluminum is applied in the form of an open cylinder, and in the upper cover of the device’s case there are slots for placement in one row of a set of N - the number of sample cells, each and of which has a cylindrical shape, and the outer diameter of the cuvette is associated with the geometric dimensions of the lamp so that the required number of cuvettes can be placed inside the working area of the U-shaped part of the lamp, while the cuvettes and the lamp balloon, the length of which is selected depending on the required placement the number of cuvettes made of thin-walled tubular quartz glass of high purity, transparent for the emission of resonant mercury lines 185 and 254 nm, in addition, each cuvette is equipped with agitators consisting of ferromagnetic blades and rotary disks, each stirrer blade, which is a steel rod hermetically sealed in a cylindrical glass ampoule, with a length shorter than the inner diameter of the cell, is placed inside each cell on its bottom, and each ferromagnetic disk of the mixer is equipped with two cylindrical constants magnets mounted on its upper surface facing the bottom of the cuvette, the magnetic axis of these magnets being diametrically and the magnetization vectors of each of the pairs of magnets oriented opposite, the axis of rotation of the ferromagnetic disks coincide with the axis of symmetry of the cuvette, while the ferromagnetic disks are mounted on the shafts of electric motors connected by an electric circuit to the power supply and speed control of the electric motors, and the above lamp is connected by an electric circuit to the power supply of this lamp, characterized in that the device is additionally equipped with a refrigerator containing a heat sink in contact with a part of the cylinder of a low-pressure mercury arc lamp for photochemical processes U-shaped esses, and a radiator with a fan connected to the heat sink, as well as an electronic control unit for the thermal regime of the lamp, which includes a temperature sensor mounted on the heat sink, connected by an electric circuit to the power supply unit and control the speed of electric motors.