M 2215 (OTTO) 1-Methyl 2-pyrrollidone, 99% Cas 872-50-4 - used to recover certain hydrocarbons generated in the processing of petrochemicals, such as the recovery of 1,3-butadiene and acetylene. M 2215 (OTTO) 1-Methyl 2-pyrrollidone, 99% Cas 872-50-4 - used to absorb hydrogen sulfide from sour gas and hydrodesulfurization facilities.