Solvent recovery —— Recovery and refining of petroleum ether solvent

Solvent recovery —— Recovery and refining of petroleum ether solvent

Petroleum ether is one of petroleum fractions. It is mainly a mixture of saturated aliphatic hydrocarbons with low polarity. It is insoluble in water and cannot be intermixed with methanol, ethanol and other solvents indefinitely. According to different boiling points, petroleum fractions commonly used in the laboratory have the following several kinds, and their regeneration methods are roughly the same.

Solvent recovery —— Regeneration method:

If the used petroleum ether contains a small amount of low molecular alcohol, acetone or ether, it should be washed several times with water in the separating funnel, dehydrated with calcium chloride, re evaporated, and collected within a certain boiling point. If it contains a small amount of chloroform, it should be washed with dilute alkali in the separating funnel first, then washed several times with water, dehydrated with calcium chloride and re evaporated.

Solvent recovery —— Refining method:

For industrial petroleum ether, use concentrated sulfuric acid, add 50% per kilogram, shake and place for one hour, then separate the lower sulfuric acid solution to dissolve the unsaturated hydrocarbons. According to the color of the sulfuric acid layer, shake and extract with sulfuric acid for two or three times. The upper layer of petroleum ether is washed once with 5% dilute alkali solution, and then washed several times with water. Calcium chloride is dehydrated and then re evaporated. If absolute anhydrous is needed, sodium metal wire or phosphorus pentachloride is added to dehydrate and dry.