Study of azomethine functionalized cellulose with salicylaldehyde as novel demetallization agent for metalloporphyrins in crude oil

Cellulose was chemically derivatized via the 6-deoxy-6-chloro cellulose (CCl) and 6-deoxy-6-(ethylene-1,2-diamine) cellulose (CCl-En) intermediates synthesis followed by azomethine coupling with salicylaldehyde to obtain 6-deoxy-6-(ethylene-1,2-diamine) cellulose salicylaldehyde azomethine base (CCl-En-Sal). These modified cellulose derivatives were characterized by FT-IR, ¹³C CP/MAS NMR, TG and SEM–EDX techniques. The cellulose azomethine salicylaldehyde (CCl-En-Sal) were exploited for demetallization of Ni and V from the metal porphyrins present in crude oil. For this, diluted mangla crude oil was mixed with water doped CCl-En-Sal with varying amounts ranging from 100 to 1000 ppm. The emulsion was made by using the 0.1% (m/v) SDBS (sodium dodecylbenzenesulfonate) emulsifier. The de-emulsification was carried out and Ni and V content analysis in the separated oil layer revealed that CCl-En-Sal is effective as demetallization agent for both Ni and V from crude oil. At 1000 ppm concentration the % removal of Ni and V reaches to a maximum of 43.24% and 50.67%, respectively.