Question

The commonly used dispersant is _____________

(a) Carboxylic acid

(b) Alkyl phosphoric acid

(c) Poly butyl succinic acid

(d) Sodium salts of alkyl benzene sulfonic acid

I have been asked this question in an internship interview.

My question comes from Types of Additives topic in portion Lubricants of Applied Chemistry

Answer 1

Right choice is (c) Poly butyl succinic acid

For explanation I would say: The calcium, sodium and magnesium salts of the alkyl benzene sulfonic acids are used as detergents. Carboxylic aids and the alkyl phosphoric acid are the other commonly used detergents. The commonly used despersants is poly butyl succinic acid.