A preparation device, system and method for a laboratory alkali cylinder

Abstract

A preparation device, system and method for a laboratory alkali tank. The preparation device includes a mixing tank, a first liquid inlet pipe and a first connecting pipe are arranged on the mixing tank, and a feeding cylinder is arranged above the mixing tank. The lower end of the material barrel communicates with the inside of the mixing cylinder. The feeding barrel is provided with a feed hopper and a driving device. The output end of the driving device is connected with a rotating rod. The outer wall of the rotating rod is provided with a The internal spiral blade and the dial, and the stirring paddle located inside the mixing tank, the dial is located under the spiral blade, the outer diameter of the dial is equal to the inner diameter of the feeding cylinder, and the dial is provided with a second A through hole, the second through hole communicates with the feed cylinder and the mixing cylinder. The present invention can ensure that quantitative sodium hydroxide is added to excess ethanol in an orderly manner, significantly slowing down the temperature rise of the ethanol solution, further shortening the subsequent cooling time, and shortening the preparation cycle of alkali vats.

Description

technical field [0001] The invention relates to the field of laboratory intermediate synthesis equipment, in particular to a preparation device, system and method for a laboratory alkali jar. Background technique [0002] Aliphatic and aromatic compounds are often used in drug synthesis experiments. After the experiment is completed, directly brushing the glass instruments with water cannot effectively remove the organic reagents adhering to the walls, so most laboratories are equipped with alkali tanks to soak the glass instruments before cleaning them. [0003] The alkali tank is an important device for cleaning glass instruments in the laboratory. Its cleaning mechanism is mainly through the dissolution of ethanol and the acid-base reaction under strong alkali conditions. Among them, the polarity of ethanol has a good dissolving effect on most organic substances, and as an organic solvent, ethanol is more economical and safe; strong alkali has a destructive effect on oil...

AI Technical Summary

Problems solved by technology

In the first method, due to the introduction of a large proportion of water, the ability to dissolve organic matter is relatively poor, and in the process of soaking in alkali tanks, some glass instruments that have been scrubbed with clean water in advance will have a certain amount of aqueous solution, which will also be harmful to alkali. The tank is diluted, resulting in a short service life of this type of alkali tank. After several weeks of use, the solution capacity is obviously reduced, and it needs to be re-prepared.

The second method effectively solves the problem that water accounts for a large proportion, and has better cleaning effect and longer service life, but its disadvantage is that ethanol (95%) or absolute ethanol has low solubility to sodium hydroxide solid particles, usually Long-term uniform stirring is required to saturate the sodium hydroxide, which increases the work intensity of the experimenter. At the same time, the dissolution process of sodium hydroxide will release heat. Alkaline tanks that are higher than room temperature must be left to stand at room temperature after the stirring is completed before they can be put into use. , resulting in a long preparation cycle

In addition, in order to saturate the sodium hydroxide, excessive sodium hydroxide particles need to be added to the ethanol, and the undissolved excess sodium hydroxide solid particles not only cause waste, but also cause damage when the experimenter accidentally puts the acid solution into the glass instrument. A violent reaction occurs, and in severe cases, the high-temperature sodium hydroxide ethanol solution rushes out of the alkali tank, endangering the safety of the experimenter

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