Complete removal of ______ from gasoline is done by Unisol process using caustic soda and methyl alcohol.
A
asphalt
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B
mercaptans
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C
diolefins
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D
waxes
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Solution
The correct option is B mercaptans Unisol process is a regenerative method for not only extracting or removing mercaptans but also some of the nitrogen compounds. In this process first gasoline is washed counter-currently with aqueous caustic methanol solution. The spent caustic is regenerated in a stripping tower where the methanol, water and mercaptans are extracted.