Question

Complete removal of _____ from gasoline is done by the Unisol process using caustic soda and methyl alcohol.
A.Asphalt
B.Mercaptans
C.Diolefins
D.Waxes

Answer 1

Hint: The gas removed in this process has a peculiar smell, which makes it a best companion to use with \[LPG\] cylinder in house. It’s the very smell responsible to alert us if there is any leak in the \[LPG\] gas, comes from this gas.

Complete answer:
The process of unisol is a method of renewal and extraction of compounds such as mercaptan and also compounds containing nitrogen, from gasoline or distillates.
Now, the gasoline from which the hydrogen sulphide $ {H_2}S $ is already removed, is treated with a solution of caustic soda i.e. sodium hydroxide $ NaOH $ and methyl alcohol which is $ C{H_3}OH $ solution at $ 40C $ or $ 100F $ . Now, the caustic soda or sodium hydroxide which is used, can be regenerated in stripping tower in $ 145C $ to $ 150C $ or $ 290F $ to \[300F\]
3. Their methyl alcohol, mercaptan and water can be extracted.

Additional information:
Gasoline can be considered to be a fuel extracted from crude oil and some petroleum liquids. The petroleum industry produces gasoline motors which are sold in gas stations.
Do you know that gasoline is sold on a grade basis? There are three types of grades in which gasoline is differentiated.
Regular
Mid-grade
Premium
The less the quantity of lead included in the gasoline greater the grade of it.

Note:
Now it is an interesting fact that gasoline can be changed with the season . The vapour pressure makes all the difference between a summer grade and a winter grade gasoline. In warm weather gasoline can be evaporated easily forming hazardous organic gas which leads to hazardous health issues.