Experimental Study on Flocculation Pretreatment of Waste Engine Oil

Abstract

Waste engine oil, abundant in large amounts of petroleum hydrocarbons, has valuable recycling merits. However, high quality of waste engine oil is crucial to the emerging recovery technology, that is, to pretreat waste oil to remove all granular impurities. Recycled from certain 4s automobile store, the waste engine oil is used as raw material in our experiments to be pretreated by means of flocculation so as to remove impurities and to enhance its light transmittance rate, thereby acquiring two Aliphatic amine flocculants with better flocculation effect: IPDA and N-(2-Hydroxyethyl) ethylenediamine. Experiments demonstrate that flocculation effect is determined by the following factors in the order of significance: flocculants dosage, flocculation temperature, stirring duration. Hence, optimal reaction conditions for the above-mentioned flocculants are as follows: 6mL (10% V/V IPDA solution) and 10mL (20%V/V N-(2-Hydroxyethyl) ethylenediamine solution), 75oC and 80 oC reaction temperature correspondingly, 10min and 8min stirring time respectively.