Distillation: apparatus – Apparatus – Systems
Patent
1997-12-16
1999-10-05
Manoharan, Virginia
Distillation: apparatus
Apparatus
Systems
202169, 202170, 202189, 202202, 202203, 2022671, 203 43, 203100, 422260, B01D 1102
Patent
active
059617870
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE DISCLOSURE
The present invention relates to a solvent extraction apparatus comprising a heating plate or the like, a boiling vessel for a solvent, an extraction thimble for a sample to be extracted and a cooler for condensing evaporated solvent vapours, which cooler preferably via an adaptor is connected to the boiling vessel, a lifting rod passing through the cooler, the rod preferably having a round cross section and in its lower part being provided with a drip rim or the like, which preferably is provided with holes and on which the thimble is detachably fixed. The drip rim or the like is intended for guiding condensed solvent to the thimble. The thimble can be moved vertically into different positions during the extraction by means of the lifting rod.
Extraction devices for analysis of fat or the like have existed for at least 100 years Modern methods known for about 30 years relates to an, extraction while boiling the sample in a solvent followed by a vapour extraction and a vapour condensate extraction at a continued boiling of the solvent. These known devices supply a great need They have however, a disadvantage since they are not wholly satisfactory from the view point of working environment Thus, solvent leaks via coolers and areas of sealing for instance. It is also necessary to move the sample between different steps which also means that solvent will get out into the premises. Therefore, there is a great need for an extraction apparatus which will emit a smaller amount of solvent to the premises.
SUMMARY OF THE INVENTION
According to the present invention it has been possible to satisfy this need and construct a solvent extraction apparatus comprising a heating plate or the like, a boiling vessel for a solvent, an extraction thimble for a sample to be extracted and a cooler for condensing evaporated solvent vapours, which cooler preferably via an adaptor is connected to the boiling vessel, a lifting rod passing through the cooler the rod preferably having a round cross section and in its lower part being provided with a drip rim or the like, which preferably is provided with holes and on which the thimble is detachably fixed. The drip rim or the like is intended for guiding condensed solvent to the thimble which thimble can be moved vertically into different positions during the extraction by means of the lifting rod. The upper part of the cooler is possibly sealed by means of a lid or the like which embraces the lifting rod and the upper part of the cooler whereby only very small amounts of solvent can get out to the environment. The cooler is furnished with a funnel shaped means preferably a concave bottom with through going, preferably peripherical holes for departing solvent vapours and with a central downwards directed outlet for condensed solvent vapours. The outlet is provided with a branch conduit which preferably debouches outside the side wall of the cooler. This outlet has the same inner diameter as the diameter of the lifting rod at a matching lower section of the lifting rod. The lifting rod is at this section shaped in such a manner by partial bevelling or the like that condensed solvent at a first boiling step and a subsequent vapour condensate extraction step can flow between the bevelled part and the adjacent inner wall of the outlet end then via the drip rim or the like to the thimble, while the passage to the branch conduit at these steps is closed by means of the remaining non-bevelled part of this section of the lifting rod which constitutes a tightening surface against the branch conduit. The lifting rod has below this partially bevelled part, a section with a smaller diameter than the main part of the lifting rod or it is bevelled at least towards the side where the branch conduct is placed. The lifting rod is below this thinner part provided with a sealing part intended at a full elevation of the lifting rod to seal against the lower part of the outlet and form a kind of bottom-valve at a third recovery step and at an optional fourth drying step whe
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Alstin Finn
Persson Goran
Foss Tecator AB
Manoharan Virginia
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