CS259400B1 - Laboratory glass washing equipment - Google Patents

Abstract

Equipment for washing laboratory glassware based on a Soxhlet extractor, which allows washing with a minimum amount of waste solvent. A solvent transport tube is immersed at one end in the extraction part of the Soxhlet extractor, which passes through a cooler and a pump and is equipped with a solvent spray nozzle at the other end. The nozzle passes through a stopper and opens into a funnel for collecting contaminated solvent. In addition to the nozzle, a tube for draining contaminated solvent passes through the stopper, passes further through a cooler and an outlet for solvent vapors and opens into a flask for distilling contaminated 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)

SUBJECT Soxhlet extractor-based laboratory glassware washing apparatus, characterized in that a solvent transport tube (2) passing through a cooler (3) and a pump (4) provided at the other end with a nozzle is immersed in the extraction part of the Soxhlet extractor (10) (5) for spraying solvent through the advantage of laboratory glassware is the fact that it removes large amounts of waste solvents and thus solves the problem of disposal. The device is structurally easy to assemble from commercially available laboratory glassware and equipment. It allows convenient, efficient and fast washing of laboratory glass immediately after contamination. 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, a discharge tube 2 extending from the extraction portion 10, which passes through the cooler 3, which passes through the condenser 3 and the pump 4, and is provided with a solvent spray nozzle 5 at the other end. The nozzle 5 passing through the stopper 6 opens into a funnel 7 for collecting contaminated solvent. In addition to the nozzle orifice 5, there is an opening for the tube 8 in the plug 6 which passes through the condenser 3 and the outlet 9 of the Soxhlet extractor for solvent vapors and opens into the flask 1 for distillation of the contaminated solvent. From the heat source-heated solvent bank 1, solvent vapors are discharged through outlet 9 to condenser 3 where they are condensed. The condensate is collected in the extraction section 10 of the Soxhlet extractor. The pump 4 pumps the distilled solvent from the extraction part 10 through the tube 2 and the solvent is sprayed through the nozzle 5 passing through the stopper 6 and the funnel 7, and the inner part of the container is washed. The contaminated solvent in the form of a film layer flows into the funnel 7 provided with the stopper 6 and passes through the conduit 8 through the condenser 3 and the outlet 9 into the flask 1. The whole process is repeated by washing the inside of the contaminated container with another clean regenerated solvent. In the case of pipette washing, the pipette is pushed onto the nozzle 5 (preferably a long injection needle) and a small beaker is placed on top of the pipette. The solvent stream is passed through the inner surface of the pipette, sprayed on the inner side of the tube surface and flows into the funnel 7. The solvent used is selected according to the nature of the impurities on the laboratory glass. As a pump, a hand pump of a small volume (5 ml) liquid dispenser can be used. BACKGROUND OF THE INVENTION A plug (6) for a funnel (7) for collecting a contaminated solvent, wherein the funnel plug (6) is provided with an opening for a conduit (8) to remove contaminated solvent that passes through the condenser (3) and outlet (9) for steam solvent and into the flask (1) to distil the contaminated solvent. 1 sheet of drawings 259400 JTLE 'VK'