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10 months ago in Chemistry , Organic Chemistry By Seema
What is the difference between petroleum ether 40 and petroleum ether 60?
I'm purifying a reaction product via column chromatography and need to choose the correct eluent. My protocol specifies "petroleum ether," but the lab stocks both the 40-60 and 60-80 boiling range fractions. As an experimentalist, I need to know the operational difference. Is it just boiling point, or does the different hydrocarbon composition significantly affect solvent strength, evaporation rate, or safety for isolating specific compounds?
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By Rinku Answered 5 months ago
The number refers to the boiling point range in degrees Celsius; PE 40 boils between 40-60°C, PE 60 between 60-80°C. In practice, I choose based on the task. For rapid solvent removal in a rotary evaporator, I'd use PE 40. For column chromatography, PE 60 is often preferable as its slightly higher boiling point reduces evaporation in the column, leading to more consistent flow and separation. The solvent strength is very similar both are non-polar aliphatic mixtures but PE 60 may contain slightly heavier hydrocarbons, which can minutely affect elution power. Always check your compound's solubility in both.
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