Separation funnel shaker extraction operation rules

The separatory funnel shaker is fully automatic.
It consists of three parts: extraction bottle, adjustable frequency motor and timely control system
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Its working principle is to make the extractant rotate back and forth in the extraction bottle from top to bottom, and then from bottom to top through the adjustable frequency motor, so that the extractant and the water sample are fully combined and violently collided to achieve the purpose of complete extraction.
Completed in a closed extraction bottle, the problem of reagent volatilization is completely solved, and the extraction results are more stable and reliable
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It can be oscillated vertically or obliquely (adjustable angle) to process a large number of samples at one time, maximizing the efficiency of sample extraction and preparation
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The series separatory funnel shaking extractor is a liquid-liquid extraction device used in chemical laboratories
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At present, in domestic laboratories, hand-crank extraction is commonly used with dispensing leaks
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This method is cumbersome, has low extraction efficiency, and is labor-intensive, and the organic solvent used in extraction will bring physical harm to the experimenter
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Separation funnel extraction operation steps: A.
Check whether the cover and cock of the separation funnel are strictly selected
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The method of checking whether the separatory funnel leaks, usually add a certain amount of water first, shake it, and see if it leaks Warning: A.
The lid cannot be oiled B.
The leaking separatory funnel cannot be used to ensure safe operation.
B.
Adding the extract will be The extraction solution and the extractant are respectively poured from the top of the separatory funnel.
The choice of the extractant should be determined according to the solubility of the extracted substance in the solvent, and at the same time, it should be easy to separate from the solute and use a low boiling point solvent
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The more water-soluble substances can be extracted with benzene or *l generally less water-soluble substances can be extracted with petroleum ether; the water-soluble ones can be divided into two phases with ethyl acetate liquid
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Note: A.
When necessary, use a glass funnel for feeding C.
Extraction and shaking 1.
Shake the separatory funnel to make the two-phase liquid layer fully contact.
The shaking operation is generally to tilt the separatory funnel so that the upper mouth of the funnel is slightly downward and the liquid is mixed.
Note for emulsion: 2.
Use a lot of force when shaking, and at the same time prevent liquid leakage.
2.
After the extraction and shaking is completed, the deflation shaking is completed
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Keep the separatory funnel in a tilted state, unscrew the cock, release the steam or the generated gas, and balance the internal and external pressures
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Note for gas release: 1.
Remember that the upper mouth of the separatory funnel should be tilted downward when deflated, and there should be no liquid at the lower mouth.
Unstable emulsions were allowed to separate
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In general, it should be left standing for about 10 minutes, and those who are difficult to separate should be left standing for a longer time.
The liquid is divided into two clear layers.
Note: During extraction
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Especially when the solution is alkaline, emulsification often occurs, which affects the separation
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The methods to destroy the emulsification are: gently shake the funnel to accelerate the stratification.
3.
If the emulsification occurs due to the partial dissolution of the two solvents (water and organic solvent), a small amount of electrolyte (such as sodium chloride) can be added to use salt If the emulsification occurs due to the small density difference between the two phases, electrolytes can also be added to increase the density of the water phase.
Method Elimination According to different situations, ethanol, sulfonated castor oil, etc.
can also be added to eliminate emulsification