The metering valve chromatograph

 

(57) Abstract:

Use: for analysis of multicomponent mixtures of different composition. The essence of the invention: simultaneous input into the chromatographic column and joint analysis of a fixed number of three various sized samples of different substances metering valve includes a housing assembled from sections in which you have two end-to-end axial channel, seven pairs, evenly spaced and diametrically from opposite sides of the casing, radial holes and movable locking elements are made in the form of hollow tubes with plugs in the center and holes on both sides of the stub is placed in the axial channel of the housing, and movable locking elements are connected between a replaceable container for dispensing gas, and the stub in the center of each of the locking elements have radial holes and an annular groove on the outer diameter for dispensing two different liquids. 1 C.p. f-crystals, 1 Il.

The invention relates to analytical instrumentation, namely the input samples into the chromatograph, and can be used for qualitative and quantitative analysis of multicomponent mixtures of unknown composition in the distinctions of the technology, ecology, etc.

Known metering valves of various designs to enter a gaseous or liquid samples into the chromatograph [1]

However, the known metering valves do not provide simultaneous input chromatographic column three fixed volume samples, two of which are designed for different substances in the liquid phase and one for gas.

Closest to the proposed invention the technical essence is the faucet for switching a gas flow, comprising a housing, a seal, locking elements made in the form of hollow tubes with plugs in the center and holes on the side surfaces of the annular recess on the outer diameter on both sides of the stub [2]

The disadvantage of this valve is that it allows you to enter only samples of the analyzed compounds in the gas phase, which significantly limits the ability of the chromatographic analysis and does not provide the possibility of improving the accuracy of quantitative and qualitative measurements by simultaneous analysis of gaseous and liquid samples in the period of one cycle analysis [3]

Object of the invention is to enhance the functionality of chromatographic analysis and improved t is I chromatography comprising a housing in which there are two end-to-end axial channel and seven pairs evenly spaced and diametrically opposite sides of radial holes connected with the axial channels, the o-ring seal and movable locking elements are made in the form of hollow tubes with plugs in the center and holes on the side surfaces of the annular grooves on the outer diameter on both sides of the stub is placed in the axial channels of the body, with openings movable locking elements combined with the corresponding radial openings, and movable locking elements are connected between a replaceable container for dispensing gas, each of the three pairs of radial holes located in the Central part of the body, connected by channels made between the axial channels of the body, and one of the connecting channels other than the Central, provided with an additional channel for the liquid discharge, and a stub in the center of each of the locking elements have radial holes and an annular groove on the outer diameter for dispensing two different liquids, the body is made of prefabricated sections, connected through the seal.

When the solution supplied with the om analysis on the chromatographic column, a fixed number of three various sized samples of various substances. While one of the samples for substances in the gas phase, and the other two for substances in the liquid phase.

The proposed device is characterized by a new set of essential features that ensure the achievement of a technical result that allows you to extend the functionality of chromatographic analysis, for example, to enter at the same time to analyze the substance of comparison (standard, grid standards, labels, additives, and so on); the analyzed mixture and gas, providing a timing output rezorbiruetsa component; to obtain greater precision chromatographic spectra; to determine more accurate values of retention by extrapolation of the measured values to the infinitely large to the percentage of impregnation of the solid carrier stationary liquid phase, the zero value samples, zero pressure in the column, as well as to improve the accuracy of quantitative interpretation of chromatograms.

The invention is illustrated in the drawing.

Metering valve for chromatography includes a housing 1, made of seven prefabricated sections with axial and radial holes, the movable locking elements 2 made of hollow tubes with caps 3 in the center and holes 4-7 on either side. is eccii of the housing 1 corresponding to the plugs supplied through radial holes 9, one of which 10 is used to discharge the liquid. Prefabricated sections of the housing 1 are connected through the lenticular 16 seals 11 with axial holes for sealing the movable locking elements 2 and tightened the four bolts 12 by means of two plates 13. Stub 3 is provided with radial holes 14 and 15, which is fixed doses, respectively, fluid a and fluid B and the annular grooves 16 on the outer diameter. Hollow tube with holes 4 and 5 of the locking element 2 is made of cut tube 17 and serves as a retainer for feeding a carrier gas into the separation column in the set of samples. Hollow tube with holes 6 and 7 through the Luer connector 18 is connected with interchangeable 18 doses of the sample gas.

The metering valve operates as follows:

Operation 1 set corresponding to the position of the locking elements 2 in the drawing. Gas through the radial hole of the corresponding section of the housing 1 and the holes 6 and 7 on the side surfaces of the hollow tubes movable locking elements 2 fills replacement dose 19 fixed volume. Liquids a and B are selected respectively in twisties to clear liquid 10.

The carrier gas through the openings 4 and 5 on the side surfaces of the crosspieces 17 enters the separation column through the annular groove 16 on the outer diameter of plugs 3.

Step 2 analysis. When this shut-off elements 2 are moved relative to the housing 1, for example, using an automatic actuator or manually (right drawing). The carrier gas flows through the radial opening section of the housing 1 to the right in the drawing from the section, working with the set of holes 4 and 5 in the bridge 17 in the replacement dose of gas 19 through the opening 7 and 6 hollow tubes of the locking elements 2 and the radial hole in the section of the housing 1 and washes the sample gas, simultaneously with the sample liquid And dose 14 and the breakdown of liquid B from a dose of 15 in the separation column for the joint analysis.

The use of the invention allows to:

1. To significantly extend the functionality of chromatographic analysis and improve the accuracy of the chromatographic measurements, as for one cycle analysis is the ability to obtain information about retention time rezorbiruetsa component (gas), the compounds or the analyzed mixture (liquid a) and the substance of comparison (liquid B).

3. To increase the reliability and improve the accuracy of determination of value retention and chromatographic spectra of the studied substances.

1. The metering valve for the chromatograph, comprising a housing in which there are two end-to-end axial channel and three pairs of evenly spaced and diametrically opposite sides of radial holes connected with the axial channels, the o-ring seals and movable locking elements are made in the form of hollow tubes with plugs in the center and holes on the side surfaces of the annular grooves on the outer diameter on both sides of the stub is placed in the axial channels of the body, with openings movable locking elements combined with the corresponding radial openings, and movable locking elements are connected between a replaceable container for dispensing gas, characterized in that the body is equipped with four additional pairs of radial holes located similarly to the existing radial holes, each of the three pairs of radial holes located in the Central part of the body, connected by canals, wypolnien additional channel for liquid discharge, and the stub in the center of each of the locking elements have radial holes and an annular groove on the outer diameter for dispensing two different liquids.

2. Crane under item 1, characterized in that the casing is made of prefabricated sections, interconnected through the seal.

 

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