Method and device for the extraction treatment of a sample
OwnerWerner Lautenschlagerinventor
Life of this patent
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Abstract
In a method for the extraction treatment of a sample (19) with a solvent which is liquid at normal ambient temperature and normal pressure, in which the solvent is introduced into a preferably heatable sample chamber (12a) and there brought into contact with the sample (19), in which the solvent vapour arising in the sample chamber (12a,26) is drawn off out of the sample chamber in such a manner that an under-pressure arises in the sample chamber and a further part of the liquid solvent passes into the vapour phase, and in which the drawn off solvent vapour is cooled outside the sample chamber (12a,26) and thereby, for the purpose of recovery of pure solvent, is at least partially passed back into the liquid phase, the drawn-off solvent vapour is additionally subjected to over-pressure.
Claims18
Method for the extraction treatment of a sample with a solvent which is liquid at normal ambient temperature and normal pressure, said method comprising the steps of:
- introducing the solvent into a sample chamber and there bringing the solvent into contact with the sample whereby a portion of the solvent evaporates;
- drawing off the solvent vapor which arises in the sample chamber in such a manner as to produce a vacuum in the sample chamber, whereby a further part of the liquid solvent passes into the vapor phase;
- subjecting the drawn-off solvent to a positive pressure;
- and
- cooling and liquefying at least a portion of the drawn off and pressurized solvent vapor to recover pure solvent.
A device for carrying out the extraction treatment of a sample with a solvent which is liquid at normal ambient temperature and normal pressure, in which the solvent is introduced into a sample chamber and there brought into contact with the sample, in which solvent vapor arising in the sample chamber is drawn off out of the sample chamber in such a manner that a vacuum arises in the sample chamber and a further part of the liquid solvent passes into the vapor phase, and in which the drawn off solvent vapor is cooled outside the sample chamber and thereby, for the purpose of recovery of pure solvent, is at least partially passed back into the liquid phase, said apparatus comprising:
- an apparatus housing with a hollow, chamber into which the sample can be brought;
- a supply line opening into the sample chamber for the supply of a solvent which is liquid at normal pressure and at normal ambient temperature;
- a component with a valve effect connected in the supply line;
- a suction line connected with the sample chamber;
- a condensate cooler connected to the suction line;
- and
- a suction pump arranged in said suction line for drawing off solvent vapor arising in the sample chamber and for generating a vacuum in the sample chamber, which promotes the passage of liquid solvent into the vapor phase;
- said suction pump being capable of generating a positive pressure at its output and being connected in the suction line between the sample chamber and the condensate cooler, the input of the suction pump being connected with the sample chamber and its output being connected with the condensate cooler.
Dependencies are inferred from the claim text.