WO1998045680A1 - Combined vessel system used with microwave decomposing apparatus - Google Patents

Combined vessel system used with microwave decomposing apparatus Download PDF

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Publication number
WO1998045680A1
WO1998045680A1 PCT/HU1998/000030 HU9800030W WO9845680A1 WO 1998045680 A1 WO1998045680 A1 WO 1998045680A1 HU 9800030 W HU9800030 W HU 9800030W WO 9845680 A1 WO9845680 A1 WO 9845680A1
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WO
WIPO (PCT)
Prior art keywords
vessel
basic
bell
combined
decomposition
Prior art date
Application number
PCT/HU1998/000030
Other languages
French (fr)
Inventor
Ferenc Kubovics
Original Assignee
Ferenc Kubovics
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ferenc Kubovics filed Critical Ferenc Kubovics
Publication of WO1998045680A1 publication Critical patent/WO1998045680A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
    • B01J19/12—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electromagnetic waves
    • B01J19/122—Incoherent waves
    • B01J19/126—Microwaves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/44—Sample treatment involving radiation, e.g. heat

Definitions

  • the invention related to a vessel system used with microwave decomposing apparatus comprising a basic vessel placed on a rotary plate for receiving the material to be decomposed - i.e. samples and chemical agents used for decomposition.
  • Microwave apparatus is more and more often used in laboratories for carrying out different operations.
  • One of these operation is decomposition with microwave, which means the preparation of the samples to be analysed by means of certain types of analysers, i.e. the solving of the sample in any kind of solvent.
  • Different acids such as HN0 3 , H 2 0 2 , H 2 S0 4 , H 3 P0 4 , HCL, HF or other acids being most suitable for solving the sample are used.
  • alkalis or organic solvents are used as solvents.
  • the chemical agents used for decomposition, the high temperature and pressure require a specific embodiment of the vessel system receiving the sample.
  • a lot of different kinds of microwave decomposing apparatus are on the market all over the world.
  • the two different - opened and closed - technics require the preparation of the sample carried out in different ways, because a greater quantity of the sample can be decomposed with an opened vessel system while the closed vessel system is suitable for decomposing only a quite small fragment of this quantity of the same sample, but the sample can be decomposed with it in a higher degree.
  • the quantity of the sample which can be measured in is limited by the geometrical sizes of the closed vessel system.
  • the object of the present invention is to form a vessel system which is suitable for realizing both the opened and the closed system decomposition.
  • An essential condition is that it should not be necessary to pour the sample to be decomposed into another vessel to realize the both decomposition manner at the same time.
  • the present invention is based on the recognition that the advantages of both types of decomposition systems can be utilized by completing an apparatus having basically a closed vessel system with an appropriate means.
  • the vessel system operates as an opened vessel system while in the second phase it began to operate essentially as a closed vessel system.
  • the known vessel systems usually consist of plastic components. One of them into which the sample is placed is the basic vessel. Chemical agent used for decomposition e.g. an acid is poured onto the sample placed into the basic vessel, then the vessel system is assembled and closed, thereafter the appropriate microwave program is started.
  • Chemical agent used for decomposition e.g. an acid is poured onto the sample placed into the basic vessel, then the vessel system is assembled and closed, thereafter the appropriate microwave program is started.
  • the known closed vessels have a volume of about 100 ml, but there are also vessels having sizes different from it.
  • the quantity of the measured sample is delimited by volume of the vessel, the character of the sample as well as the pressure in the vessel system. In a vessel system of a high quality this quantitative value is usually about 0.5 g.
  • the aim of the invention is achieved by forming a vessel system comprising a basic vessel placed on a rotary plate for receiving the material to be decomposed - i.e. the sample and the chemical agent for decomposition, wherein the basic vessel is formed to be suitable for a decomposition carried out with an apparatus type having a combined vessel system, the basic vessel is provided with a bell-shaped refrigerating cover closing the basic vessel from above and having an aperture at its end opposite to the basic vessel and this aperture of the bell-shaped refrigerating cover is connected with a vacuum pipe for draining the gases developed during the decomposition.
  • the combined solution is realized by completing the known type of closed vessel system with an opened and on upwardly tapered bell-shaped refrigerating cover made of heat-resisting glass, silica glass or other similar material so that on its relatively great cooled surface the acids recondensate and can take their decomposing effect again.
  • the combined basic vessel of a preferred embodiment of the vessel system according to the invention is provided with a rim and the bell-shaped refrigerating cover of that is formed with a flange.
  • the combined vessel system is provided with a sealing between the flange of the basic vessel and the rim of the bell-shaped refrigerating cover and comprises also a vacuum pump connected to a vacuum pipe through a bypipe and an acid fume adsorbing unit.
  • the bell-shaped refrigerating cover of a preferred embodiment of the vessel system according to the invention is made of heat-resisting glass, silica glass or other similar material while the sealing between the basic vessel and the bell-shaped refrigerating cover is made of Teflon or silicone rubber.
  • Fig 1 shows the combined vessel system according to the invention during operation
  • Fig 2 shows a view of the refrigerating cover of the combined vessel system illustrated in Fig 1.
  • Fig 1 shows the combined vessel system according to the invention which is suitable for microwave decomposition during operation.
  • the combined vessel system according to the invention consists essentially of a well-known basic vessel
  • a bell-shaped refrigerating cover 4 provided with a rim 12 on its end closing the basic vessel 1 from above and on its end opposite to the basic vessel 1 with an aperture 13 in narrowing part as well as a vacuum pipe 10 connected to the upper aperture 13 of the bell-shaped refrigerating cover 4.
  • a vacuum pump or an acid fume adsorbing unit can be connected to the vacuum pipe 10 through a bypipe 8.
  • the basic vessel 1 is a TFM vessel having a volume of 100 ml, a diameter of 36 mm and a length of 10 mm. A quantity of 6.2 g of a sample having a sugar content of 30% is placed into this basic vessel 1. The sample contains also other organic compounds.
  • the basic vessel l is placed onto a rotary plate 9 with six manipulation places made of polypropylene Teflon inserts are place on its heated parts. 18.5 ml of acid is dropped onto the sample having the above-mention content placed into the basic vessel 1 in the above-mentioned quantity.
  • 60 ml of acid is necessary to decompose the above-mentioned quantity of the sample in case of using the well-known open vessel systems.
  • the quantity and kind of the sample are well-known per se.
  • the bell-shaped refrigerating cover 4 and the rotary plate 9 are placed onto the basic vessel 1 and elevated by means of a well- known gear bar in a height so that the upper end of the bell-shaped refrigerating cover 4 which is tapered opposite to the basic vessel 1 and contains the aperture 13 enter the vacuum pipe 10 and reaches into this into an appropriate depth.
  • the bell- shaped refrigerating cover 4 is formed of heat-resisting glass, silica glass or other similar material. Its lower end close to the basic vessel 1 is provided with a rim 12 having a width of about 20 mm which is seated on the sealing 6 placed on the flange 11 of the basic vessel 1.
  • the basic vessel 1 and the bell-shaped refrigerating cover 4 form so a closed space.
  • Fig 2 shows the embodiment of the bell-shaped refrigerating cover 4 very well.
  • the microwave decomposition is started.
  • the mantle of the bell-shaped refrigerating cover 4 is cooled during the decomposition.
  • air is used as cooling medium 7 which rinses also the operation space of the combined vessel system, but C0 2 can also be utilized as cooling medium 7.
  • acid fumes develop which stay in the interior space 3 of the bell- shaped refrigerating cover 4. Since the mantle of the bell-shaped refrigerating cover 4 is continuously cooled, the fumes condensate on the interior wall 5 of the bell- shaped refrigerating cover 4 and so the acid reflows along the wall 5 into the basic vessel 1 where it can be utilized again. This allows a significant decrease of acid consumption.
  • Acid fumes - which have not condensated - are conducted to an acid fume adsorbing unit through the vacuum pipe 10 connected to the aperture 13 on the tapered part by means of a vacuum pump.
  • a part of the steams and gases developed during the decomposition of the sample and acids e.g. NO, C0 2 , etc. can escape without any difficulty through the upper aperture 13 of the bell-shaped refrigerating cover 4 while the rest condensates on the interior surface of the bell-shaped refrigerating cover 4 and reflows into the basic vessel 1.
  • the quantity of the decomposable sample can be increased about ten times in comparison to that of the sample decomposable in the well-known closed vessels, - the utilized quantity of acids decreases to about one third of that in comparison to the completely opened vessel systems, which is very important in respect of the accuracy of the measurement,
  • the first step of the decomposition takes place in a considerately manner at atmospheric pressure so that the loss of volatile materials can be decreased, - acid fumes are removed by so-called drawing-off from the opened top of the combined vessel system so that they can be neutralized if it is necessary,

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Toxicology (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electromagnetism (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Furnace Details (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

The invention relates to a combined vessel system used with microwave decomposing apparatus comprising a basic vessel (1) placed on a rotary plate (9) for receiving the material to be decomposed - the sample and chemical agents used for decomposition. In the combined vessel system the basic vessel (1) is formed to be suitable for a combined microwave decomposition. The basic vessel (1) is provided with a bell-shaped refrigerating cover (4) closing the basic vessel (1) from above and having an aperture (13) on its end opposite to the basic vessel (1). Said aperture (13) of the bell-shaped refrigerating cover (4) is connected with a vacuum pipe (10) draining the gases developed during the decomposition.

Description

Combined vessel system used with microwave decomposing apparatus
Field of invention The invention related to a vessel system used with microwave decomposing apparatus comprising a basic vessel placed on a rotary plate for receiving the material to be decomposed - i.e. samples and chemical agents used for decomposition.
Background of the Invention
Microwave apparatus is more and more often used in laboratories for carrying out different operations. One of these operation is decomposition with microwave, which means the preparation of the samples to be analysed by means of certain types of analysers, i.e. the solving of the sample in any kind of solvent. Different acids such as HN03, H202 , H2S04 , H3P04 , HCL, HF or other acids being most suitable for solving the sample are used. In certain cases, however, alkalis or organic solvents are used as solvents. The chemical agents used for decomposition, the high temperature and pressure require a specific embodiment of the vessel system receiving the sample. A lot of different kinds of microwave decomposing apparatus are on the market all over the world. The significant difference between the known types of apparatuses lies in the features of the vessel systems used in them. There exist so- called opened vessel systems (operating at atmospheric pressure), e.g. the types sold by the companies CEM, Prolabo etc. The other kind of such apparatuses are the types comprising a so-called closed vessel system (operating at over-pressure). The types known as PAAR, MILESTONE, CEM have such vessel systems.
The two different - opened and closed - technics require the preparation of the sample carried out in different ways, because a greater quantity of the sample can be decomposed with an opened vessel system while the closed vessel system is suitable for decomposing only a quite small fragment of this quantity of the same sample, but the sample can be decomposed with it in a higher degree.
The practical experiences showed that both kind of vessel systems have their own practical importance. Certain kinds of sample can also be decomposed at atmospheric pressure, while a higher temperature is necessary in case of decomposition of other samples and therefore these samples can be decomposed in a closed vessel system much better. The decision of the user concerning the optimal kind of vessel system depends on the character of the task and the sample, but in many cases neither of the above-mentioned types of apparatuses offer the optimal
solution.
If a greater quantity of any sample should be decomposed possibly in a closed vessel system, the quantity of the sample which can be measured in is limited by the geometrical sizes of the closed vessel system.
As mentioned above, all of known vessel systems are closed or opened. So far no such a vessel system is known in which the decompositions to be carried out in the same microwave apparatus in which both the opened and the closed vessel system can be combined with each other. Summary of the Invention
The object of the present invention is to form a vessel system which is suitable for realizing both the opened and the closed system decomposition. An essential condition is that it should not be necessary to pour the sample to be decomposed into another vessel to realize the both decomposition manner at the same time.
The present invention is based on the recognition that the advantages of both types of decomposition systems can be utilized by completing an apparatus having basically a closed vessel system with an appropriate means. In the first phase of the decomposition, the vessel system operates as an opened vessel system while in the second phase it began to operate essentially as a closed vessel system.
The known vessel systems usually consist of plastic components. One of them into which the sample is placed is the basic vessel. Chemical agent used for decomposition e.g. an acid is poured onto the sample placed into the basic vessel, then the vessel system is assembled and closed, thereafter the appropriate microwave program is started.
The known closed vessels have a volume of about 100 ml, but there are also vessels having sizes different from it. The quantity of the measured sample is delimited by volume of the vessel, the character of the sample as well as the pressure in the vessel system. In a vessel system of a high quality this quantitative value is usually about 0.5 g.
It should be taken into account that during the decomposition a gas formation takes place, which can cause an over-pressure in the vessel. The quantity of the developed gases - which is proportional to that of the sample placed into the vessel - delimits mainly the usability of closed vessels.
The aim of the invention is achieved by forming a vessel system comprising a basic vessel placed on a rotary plate for receiving the material to be decomposed - i.e. the sample and the chemical agent for decomposition, wherein the basic vessel is formed to be suitable for a decomposition carried out with an apparatus type having a combined vessel system, the basic vessel is provided with a bell-shaped refrigerating cover closing the basic vessel from above and having an aperture at its end opposite to the basic vessel and this aperture of the bell-shaped refrigerating cover is connected with a vacuum pipe for draining the gases developed during the decomposition.
In the solution according to the invention a part of the developed gases having a relative low temperature escape without any difficulty during the preliminary decomposition out of the vessel which is opened in this phase yet. The combined solution is realized by completing the known type of closed vessel system with an opened and on upwardly tapered bell-shaped refrigerating cover made of heat-resisting glass, silica glass or other similar material so that on its relatively great cooled surface the acids recondensate and can take their decomposing effect again. The combined basic vessel of a preferred embodiment of the vessel system according to the invention is provided with a rim and the bell-shaped refrigerating cover of that is formed with a flange. The combined vessel system is provided with a sealing between the flange of the basic vessel and the rim of the bell-shaped refrigerating cover and comprises also a vacuum pump connected to a vacuum pipe through a bypipe and an acid fume adsorbing unit. The bell-shaped refrigerating cover of a preferred embodiment of the vessel system according to the invention is made of heat-resisting glass, silica glass or other similar material while the sealing between the basic vessel and the bell-shaped refrigerating cover is made of Teflon or silicone rubber.
Brief Description of the Drawings
The invention will be explained with reference to a preferred embodiment illustrated in the following figures in which
Fig 1 shows the combined vessel system according to the invention during operation and
Fig 2 shows a view of the refrigerating cover of the combined vessel system illustrated in Fig 1. Detailed Description of the preferred Embodiment
Fig 1 shows the combined vessel system according to the invention which is suitable for microwave decomposition during operation. The combined vessel system according to the invention consists essentially of a well-known basic vessel
I placed on a well-known rotary plate and provided on its upper end with a flange
I I for receiving the sample 2 to be decomposed as well as the chemical agent used for decomposition, a bell-shaped refrigerating cover 4 provided with a rim 12 on its end closing the basic vessel 1 from above and on its end opposite to the basic vessel 1 with an aperture 13 in narrowing part as well as a vacuum pipe 10 connected to the upper aperture 13 of the bell-shaped refrigerating cover 4. A vacuum pump or an acid fume adsorbing unit can be connected to the vacuum pipe 10 through a bypipe 8. The operation of the combined vessel system according to the invention will be explained illustrated in the following example:
The basic vessel 1 is a TFM vessel having a volume of 100 ml, a diameter of 36 mm and a length of 10 mm. A quantity of 6.2 g of a sample having a sugar content of 30% is placed into this basic vessel 1. The sample contains also other organic compounds. The basic vessel lis placed onto a rotary plate 9 with six manipulation places made of polypropylene Teflon inserts are place on its heated parts. 18.5 ml of acid is dropped onto the sample having the above-mention content placed into the basic vessel 1 in the above-mentioned quantity. Here should be noted that 60 ml of acid is necessary to decompose the above-mentioned quantity of the sample in case of using the well-known open vessel systems. The quantity and kind of the sample are well-known per se. After this, the bell-shaped refrigerating cover 4 and the rotary plate 9 are placed onto the basic vessel 1 and elevated by means of a well- known gear bar in a height so that the upper end of the bell-shaped refrigerating cover 4 which is tapered opposite to the basic vessel 1 and contains the aperture 13 enter the vacuum pipe 10 and reaches into this into an appropriate depth. The bell- shaped refrigerating cover 4 is formed of heat-resisting glass, silica glass or other similar material. Its lower end close to the basic vessel 1 is provided with a rim 12 having a width of about 20 mm which is seated on the sealing 6 placed on the flange 11 of the basic vessel 1. The basic vessel 1 and the bell-shaped refrigerating cover 4 form so a closed space. Fig 2 shows the embodiment of the bell-shaped refrigerating cover 4 very well.
After the connection of the basic vessel 1 , the bell-shaped refrigerating cover 4 as well as the vacuum pipe 10 the microwave decomposition is started. The mantle of the bell-shaped refrigerating cover 4 is cooled during the decomposition. air is used as cooling medium 7 which rinses also the operation space of the combined vessel system, but C02 can also be utilized as cooling medium 7. During the decomposition acid fumes develop which stay in the interior space 3 of the bell- shaped refrigerating cover 4. Since the mantle of the bell-shaped refrigerating cover 4 is continuously cooled, the fumes condensate on the interior wall 5 of the bell- shaped refrigerating cover 4 and so the acid reflows along the wall 5 into the basic vessel 1 where it can be utilized again. This allows a significant decrease of acid consumption.
Acid fumes - which have not condensated - are conducted to an acid fume adsorbing unit through the vacuum pipe 10 connected to the aperture 13 on the tapered part by means of a vacuum pump. A part of the steams and gases developed during the decomposition of the sample and acids e.g. NO, C02, etc. can escape without any difficulty through the upper aperture 13 of the bell-shaped refrigerating cover 4 while the rest condensates on the interior surface of the bell-shaped refrigerating cover 4 and reflows into the basic vessel 1.
The advantages of the combined vessel system according to the invention are
as follows:
- the quantity of the decomposable sample can be increased about ten times in comparison to that of the sample decomposable in the well-known closed vessels, - the utilized quantity of acids decreases to about one third of that in comparison to the completely opened vessel systems, which is very important in respect of the accuracy of the measurement,
- the first step of the decomposition takes place in a considerately manner at atmospheric pressure so that the loss of volatile materials can be decreased, - acid fumes are removed by so-called drawing-off from the opened top of the combined vessel system so that they can be neutralized if it is necessary,
- the parts of the sample which can not generally be decomposed easily, can be completely decomposed in the closed vessel system.

Claims

1. Combined vessel system used with microwave decomposing apparatus comprising a basic vessel placed on a rotary plate for receiving the material to be decomposed - sample and chemical agents used for decomposition -, characterized in that the basic vessel (1) is formed to be suitable for a combined microwave decomposition, the basic vessel (1) is provided with a bell-shaped refrigerating cover (4) closing the basic vessel (1) from above and having an aperture (13) on its end opposite to the basic vessel (1) said aperture (13) of the bell-shaped refrigerating cover (4) is connected with a vacuum pipe (10) draining the gases developed during the decomposition.
2. Combined vessel system according to claim 1, characterized in that the basic vessel (1) is provided with a flange (11), the bell-shaped refrigerating cover is formed with a rim (12) further that the vessel system is provided with a sealing (6) between the flange (11) of the basic vessel (1) and the rim (12) of bell-shaped refrigerating cover (4).
3. Combined vessel system according to claims 1 or 2, characterized in that the vacuum pipe (10) is connected through a bypipe (8) to a vacuum pump and an acid fume adsorbing unit.
4. Combined vessel system according to any of claim 1 to 3, characterized in that the bell-shaped refrigerating cover (4) is made of heat-resisting glass, silica glass or other similar material.
5. Combined vessel system according to any of claims 1 to 4, characterized in that the sealing (6) placed between the basic vessel (1) and the bell-shaped refrigerating cover (4) is made of Teflon or silicone rubber.
PCT/HU1998/000030 1997-04-04 1998-03-24 Combined vessel system used with microwave decomposing apparatus WO1998045680A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
HUP9700736 1997-04-04
HU9700736A HU9700736D0 (en) 1997-04-09 1997-04-09 Combinated container for microwave breaking down apparatus
HU9800250A HU219560B (en) 1997-04-09 1998-02-05 Container for microwave breaking down apparatus
HUP9800250 1998-02-05

Publications (1)

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WO1998045680A1 true WO1998045680A1 (en) 1998-10-15

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WO (1) WO1998045680A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19938946A1 (en) * 1999-08-17 2001-03-29 Helmut Herz Solvent sample concentration method in a container involves rotating two containers to predetermined axis to cool containers after heating one container and supplying solvent vapor to other container
WO2006068579A1 (en) * 2004-12-22 2006-06-29 Foss Analytical Ab Collecting device
CN113338886A (en) * 2021-07-19 2021-09-03 海南大学 For CO2Microwave modified storage increasing technical equipment in underground sealing

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4264778A (en) * 1979-06-25 1981-04-28 Societa Italiana Per Il Magnesio E Leghe De Magnesio S.P.A. Extraction furnace
DE4129321A1 (en) * 1991-09-04 1993-03-11 Henkel Kgaa AUTOMATED LABORATORY
US5417924A (en) * 1991-02-27 1995-05-23 Societe Prolabo Apparatus connectible to a receptacle for condensing fumes generated during chemical reactions
US5447077A (en) * 1992-04-30 1995-09-05 Mls Mikrowellen-Labor-Systeme Gmbh Device for the evaporation treatment of preferably liquid substances, in particular reagents, or for the preparation or analysis of sample material
WO1997013137A2 (en) * 1995-10-03 1997-04-10 Cem Corporation Microwave assisted chemical processes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4264778A (en) * 1979-06-25 1981-04-28 Societa Italiana Per Il Magnesio E Leghe De Magnesio S.P.A. Extraction furnace
US5417924A (en) * 1991-02-27 1995-05-23 Societe Prolabo Apparatus connectible to a receptacle for condensing fumes generated during chemical reactions
DE4129321A1 (en) * 1991-09-04 1993-03-11 Henkel Kgaa AUTOMATED LABORATORY
US5447077A (en) * 1992-04-30 1995-09-05 Mls Mikrowellen-Labor-Systeme Gmbh Device for the evaporation treatment of preferably liquid substances, in particular reagents, or for the preparation or analysis of sample material
WO1997013137A2 (en) * 1995-10-03 1997-04-10 Cem Corporation Microwave assisted chemical processes

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19938946A1 (en) * 1999-08-17 2001-03-29 Helmut Herz Solvent sample concentration method in a container involves rotating two containers to predetermined axis to cool containers after heating one container and supplying solvent vapor to other container
DE19938946C2 (en) * 1999-08-17 2001-11-22 Helmut Herz Method and device for concentrating a solution sample
WO2006068579A1 (en) * 2004-12-22 2006-06-29 Foss Analytical Ab Collecting device
CN113338886A (en) * 2021-07-19 2021-09-03 海南大学 For CO2Microwave modified storage increasing technical equipment in underground sealing

Also Published As

Publication number Publication date
HU9800250D0 (en) 1998-03-30
HU219560B (en) 2001-05-28
HUP9800250A1 (en) 1998-12-28
HU9700736D0 (en) 1997-05-28

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