Introduction

Absorption: removal of \(\ce{H2S}\) from natural gas by absorption with monoethanolamine or diethanolamine solutions.

Stripping: removal of oxygen from water (for use with electronic material processing) by contacting with a nitrogen gas.

Distillation: (i) separation of benzene and toluene from a solution of benzene-toluene, (ii) fractionation of petroleum crude oil.

Extraction: (i) removal of adipic acid from water using diethyl ether, (i) removal of mercaptants from naphtha by \(\ce{NaOH}\) solution.

Adsorption: (i) removal of odor / color from materials, using activated carbon, (ii) removal of moisture from air using silica.