SU759955A1 - Device for analysis of difficultly volatile and volatile compounds - Google Patents

Description

The invention relates to a measurement technique and can be used in chemical process control systems, in particular, in liquid chromatography. five

A device for analyzing non-volatile and non-volatile compounds is known; it contains an eluate feed chamber, a pyrolysis chamber and a transport tape and is used in liquid chromatography [1]. The eluate flowing out of the liquid chromatographic column e, of that device, is continuously applied to the moving wire, which acts as a transport element-15 ta. The wire is successively drawn through the evaporation chamber, where the volatile element is removed from the eluate, and through the pyrolysis chamber, in which 20 of the detected substance is evaporated or pyrolyzed. In such a device, vapors of the substance or pyrolysis products are blown away by a gas flow — the carrier from the pyrolysis chamber to the detector. 25

A disadvantage of this device is the limited length used.

wire, the need for its re-za.ryki, low sensitivity due to 30

2

small load capacity of the wire.

It is also known a device for the analysis of non-volatile and non-volatile compounds, containing a housing in which are placed on. belt conveyor, eluate feed chamber, pyrolysis and cleaning chambers and detector £ 2]. In front of the evaporating chamber along the belt, a capillary is attached, which feeds the eluate. Switching to the compartment of the pyrolysis chamber, for the supply of carrier gas (helium) and removal of products to the plasma-ionization detector.

In the walls of the pyrolysis compartment there are slots for the transport belt through which the gae carrier can enter the evaporation chamber.

A significant drawback of the described design is the impossibility of creating a sufficiently high pressure of the carrier gas required for a stable one. operation of the plasma-ionization detector, without a bulky, requiring additional sealing of the case, which complicates and increases the cost of construction. It is not possible to create sufficiently excessive pressure in a single pyrolysis chamber, since

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759955

the entrance and exit of the tape from the pyrolysis chamber are not sealed so that mechanical interaction between the sealing devices and the eluate applied to the tape does not occur. Such movement of the eluate along the tape would lead to a distortion of the measurement results.

It should be noted that almost all-known 'and ¹ described children' s devices with an infinite transporting device have an unpressurized structure that does not allow "Iyutable sufficiently high pressure of the carrier gas and which has an insufficient * * '* ^ ¥ P6 ^? ¥ Y ^' * '' 1 ^ ё'zhnost · 'because of eaG ^ toch5 <and' carrier gas through the gaps between the transporting device and the walls - chambers.

The aim of the invention is to improve the reliability and stability of the device for the analysis of volatile and non-volatile compounds.

This goal is achieved by the fact that the tape transpdrter is made in the form of two contacting tapes, and - in the pyrolysis chamber, in the places of supply of the eluate and cleaning chamber are installed disconnectors of tapes, and at the exit and entry of tapes into the pyrolysis chamber ..... installed sealing tapes , but

also the fact that the disconnectors of these tapes in these chambers are made in the form of guide rollers, while the tapes can be made of different widths, and the sealing elements are made, for example, in the form of a stuffing box ^; '~ "~''tza' seals. Except for 'that,' Lentbch '' a new conveyor can be made

in the form of a tape, of infinite length, or of finite length, wound on ’..... reel.

The inlet and outlet of the tapes in the pyrolysis chamber 8 are equipped with sealing elements 9, 10, which allow to create high pressure in the pyrolysis chamber, which contributes to the stability of the device, and the sealing seals serve as sealing elements. To increase the completeness of destruction of the analyte, rollers 11 are provided in the pyrolysis chamber, and heater 12 is formed to heat the eluate. The resulting vapors of the substance enter the detector 13. The device is equipped with a cleaner 14, for ease of use the cleaner has rollers 15, 16 _; intended 15 for removal of the lower tape from the top.

The device for the analysis of the minor; Sneeze and non-volatile compounds works as follows. ·

At rotation of the block of a suspension bracket 3 at 20 the belt conveyor is led in forward movement. When approaching the dropper 6, the tape 5 rounds by means of the rollers 7 the dropper 6 for conveniently applying the eluate onto the tape 4. The elev · 22 ^at g applied onto the conveyor belt 4 moves into the pyrolysis chamber 8 through the sealing element 9.

In the pyrolysis chamber by

., 11 the tape 5 is again encircled from _ contact with the Tape 4 for complete destruction of the analyte in the pyrolysis chamber 8. Then through the sealing element 10 of the tape 4.5. leave the pyrolysis chamber and then go to cleaner 14. For ease of cleaning tapes 4 and 5, tape. 5 is retracted by means of rollers 15 and, bypassing the cleaner by means of rollers 16, these tapes come into contact again. The cycle repeats endlessly as needed.

The presence of two belts in the conveyor, located one on top of the other, between which the eluate is applied, eliminates the possibility of its mechanical movement along the conveyor with sealing input and output elements of the belt conveyor and prevents mechanical interaction between the sealing elements and the eluate applied to the tape. At the site of delivery of 50 eluates to the tape in the pyrolysis chamber, and at the inlet and outlet of the cleaning chamber, the tapes are separated using guide rollers.

{Yes h: eterzhe is a diagram of the device for the analysis of volatile ingredients and non-volatile compounds. In case 1 there are blocks 2, 3 of suspension and movement of the belt and belt conveyor, consisting of two tapes; bottom 4, which is applied to the eluate, and the top

... serving to prevent the mechanical movement of the eluate. To supply the eluate 'serves as a dropper 6, and

for ease of applying the eluate on the tape there are guide rollers 7. On

Practical tests have shown that such an implementation. Devices for the analysis of volatile and non-volatile compounds can significantly increase the load capacity of the belt conveyor, ie, 3-15 times, depending on the properties of the eluate.

Claims (4)

Claim 1. A device for analyzing non-volatile and non-volatile compounds, including a housing in which a belt conveyor, an eluate feed chamber, a pyrolysis chamber and a cleaning chamber and a detector are located, in order to increase reliability and stability of work, the belt conveyor is made in the form of two contacting tapes, and tape disconnectors are installed in the pyrolysis chamber and in the places of supply of the eluate and sensing chamber, while sealing and sealing elements are installed at the inlet and outlet of the tapes in the pyrolysis chamber. 759955 2. Device by π. 1, characterized in that the disconnectors tape made in the form of guide rollers. 3. Device pop. 1, about t - This is because the transporter's tapes of a sportsman are made of different widths. 4. Device pop. 1, characterized in that the sealing elements are made in the form of gland seals.