Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Patent
1998-08-25
2000-09-05
Le, Long V.
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
422 99, 422102, 202 82, 202241, 366273, B32B 518
Patent
active
061138606
DESCRIPTION:
BRIEF SUMMARY
SUMMARY
This invention concerns easy-to-use automatic cleaning equipment for solvents and volatile chemicals, by means of which substances used in a laboratory, and which have previously been sent to a waste treatment plant tor incineration, can be cleaned and reused. In the distillation vessel of the equipment, there is a new kind of combination stirrer, which stirs, measures the temperature of the mixture and acts as a base valve. The filling vessel, equipped with a separate base valve and overflow pipe, increases the operating reliability and safety of the equipment. A new kind of fraction cutter permits the taking of a pre-fraction, a main fraction and post-fraction during distillation.
GENERAL
The use of solvents is essential in chemical work. When producing substances, the original substances are usually dissolved in an inert solvent which is removed by distillation after the reaction. In chemical analysis, the compounds being examined are diluted with a pure solvent, after which the diluted mixture is examined with analytical devices, for example, a chromatograph or a sprectrometer. Particularly in liquid and column chromatography, pure solvents are used in the course of the analysis to elute the mixture through the column, creating a large amount of only slightly polluted solvent.
In recent years, most of the solvents used have been sent either directly to waste disposal or to a waste treatment plant for incineration. In the smallest units, such as colleges, environment-monitoring laboratories and other small laboratories, solvents are collected in a waste/solvent store, from where they are sent once or twice a year to a waste treatment plant, usually for incineration. In laboratories at larger industrial plants, waste solvents may, however, be cleaned on the spot in larger batches, if suitable equipment is available.
The recycling of solvents at the point of use is economical, saves natural resources and also promotes work safety, because large amounts need not be stored in a solvent store or transported for disposal.
This invention describes equipment operating on new principles, which automatically cleans solvents and other volatile chemicals, and which permits even small laboratories to recycle these substances. The equipment is small and fits easily into normal fume chambers. In addition, the amounts of solvents heated in the equipment at any one time are quite small (250 ml-2 l), which improves work and fire safety. The automatic repetition of the cleaning process, however, also allows large amounts of substances to be cleaned.
Solvents can be easily cleaned using the new equipment that is the object of the invention. The suction hose of the pump is placed in the vessel containing the solution to be cleaned and the clean product goes to the collection vessel. The equipment can also be easily dismantled for cleaning, so that the same device can be used to automatically clean several different substances. This is important in laboratories using relatively small amounts of several different solvents.
In terms of work safety, it is also important that large amounts of flammable or harmful substances are not used at one time in automatic equipment.
In the following text, the construction of the equipment is described in greater detail in terms of inventiveness. The text is illustrated by the following figures.
FIG. 1. General layout of the chemical recycling device.
FIG. 2. The combination stirrer attached to the distillation vessel.
FIG. 3. Detail of the combination stirrer.
FIGS. 4a & b. Paddle of the combination stirrer.
FIG. 5 Solvent filling vessel.
FIGS. 6a, b, c & d. Electrically-operated fraction cutter.
FIGS. 7a & b. Independent stirrers.
FIGS. 8a, b, c & d. Manually-operated fraction cutter.
CONSTRUCTION
The equipment (FIG. 1) comprises: comprising a magnetic stirrer, temperature sensor and base valve.
The reaction vessel (FIG. 1. (1)) described in the invention makes the equipment simple and easily cleaned. The separate filling vessel/pump combination accelerates the start of a n
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patent: 5609735 (1997-03-01), Hetzel et al.
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Le Long V.
Pam Solutions Ltd. Oy
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