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environment case studies storage methods of oil waste transfer during oil spill oil spill cleanup techniques treatment types of waste generated in oil spill oil co2 conversion co conversion methanol production water production results consumptions of utilities flowsheet direct co2 to methanol hydrogenation route solve three equations solve two equations solutions cramer's rule rules examples the chi square distribution goodness of fit test deactivation catalyst selection criteria fluidised bed reactor fixed bed reactor catalyst reactor application mechanism esr xps control classification hazard membranes recent developments graphene oxide chemistry application of xrd xrd