CS259400B1 - Device for laboratory glassware washing - Google Patents

Abstract

Laundry facilities glass on the basis of Soxhlet extractor allows washing with minimum quantity solvent. To extractor one part of the Soxhlet extractor end-submerged solvent transport tube that passes through the cooler and pump and is provided at the other end solvent spray nozzle. nozzle passes through the stopper and opens into the collecting funnel contaminated solvent. In addition to the zy tubing passes through the stopper purified solvent passing therethrough a condenser and a solvent vapor outlet and pouring into the bank for distillation polluted solvent.

Description

The present invention relates to a laboratory glass washing apparatus based on a Soxblet extractor, while recovering the solvent used.

The demands on the purity of laboratory glass are very high when analyzing trace amounts of substances by physico-chemical methods. Even slight contamination of the laboratory glass can cause disturbing coincidence in the final determination and thus cause undesirable distortion of the analysis results. This problem is particularly acute in the determination of pesticide residues in the environment, where in the final determination of biologically active substances, in particular gas chromatography, high performance liquid chromatography or biochemical chronometric methods, the amounts determined are often in the range of tenths of the nanogram.

Extremely high demands are placed on the purification of laboratory glass contaminated with radioactive substances by trace radiometric analysis using organic or inorganic compounds labeled with a suitable radionuclide.

Conventional washing of contaminated glass, as well as the use of automatic washing devices, generates a large amount of liquid waste and, in the case of radioactive waste, a problem with its efficient disposal.

Similar problems arise with the accumulation of waste combustible organic solvents in the washing of laboratory glass in relation to the determination of trace amounts of pesticides. In fact, pesticides are biologically active substances of an organic nature, so washing with water is inadequate.

The above mentioned drawbacks are eliminated by the laboratory glass washing apparatus according to the invention, based on the Soxhlet extractor, which consists in that a solvent transport tube is immersed in the extraction part of the Soxhlet extractor which passes through the condenser and the pump. At the other end, the tube is provided with a solvent spray nozzle that opens through a stopper into a funnel to collect contaminated solvent. From the funnel through the stopper a hose is drawn to remove contaminated solvent. This passes through a condenser and a solvent vapor outlet and opens to a contaminated solvent distillation flask.

Claims (1)

P R E tM E I Apparatus for washing laboratory glass based on a Soxhlet extractor, characterized in that a solvent transport tube (2) is immersed in the extraction part of the Soxhlet extractor (10), passing through a cooler (3) and a pump (4) provided with a nozzle at the other end. 5) for spraying the solvent through the The advantage of the laboratory glass washing device is that it eliminates the formation of large amounts of waste solvents and thus solves the problem of their disposal. The device is easy to construct and can be assembled from commercially available laboratory glassware and equipment. It allows convenient, efficient and fast washing of laboratory glass immediately after soiling. An example of a functional model of the device according to the invention is shown in the attached figure. The apparatus consists of a Soxhlet extractor, an extraction portion 10, with a solvent transport tube 2 passing through a condenser 3 and a pump 4, and at the other end provided with a nozzle 5 for spraying the solvent. A nozzle 5 passing through the plug 6 opens into a funnel 7 for collecting the contaminated solvent. In addition to the nozzle opening 5, there is a plug 6 in the plug 6 for a tube 8 which passes through the cooler 3 and the outlet 9 of the Soxhlet solvent vapor extractor and opens into a contaminated solvent distillation flask 1. The solvent vapor 1 heated by the heat source leaves the solvent vapor through the outlet 9 to the condenser 3 where it is condensed. The condensate is collected in the extraction section 10 of the Soxhlet extractor. By pump 4, the distilled solvent is pumped from the extraction part 10 through a tube 2 and through a nozzle 5 passing through a stopper 6 and a funnel 7 onto which the wash container is placed, the solvent is sprayed and washed inside the container. The contaminated film-like solvent flows into a funnel 7 provided with a stopper 6 and passes through a conduit 8 through a condenser 3 and an outlet 9 to a flask 1. The entire process is repeated by washing the interior of the soiled container with another clean, regenerated solvent. In the case of washing the pipettes, the pipette is slipped onto the nozzle 5 (preferably a long injection needle) and a small beaker is placed on top of the pipette. The solvent stream passes through the inner surface of the pipette, spraying on the inner side of the tubing surface and flowing into the funnel 7. The solvent used is chosen according to the nature of the impurities on the laboratory glass. A small pump (5 ml) liquid piston valve dispenser can be used as a pump. of a funnel (7) for collecting contaminated solvent, the plug (6) of the funnel (7) having an opening for a hose (8) for draining the contaminated solvent which passes through the cooler (3) and the steam outlet (9) a solvent and discharges into a flask (1) for distilling the contaminated solvent.