Carbon Nanotubes Characterization Andtheirpotential for Increasedhydro carbon Production
Abstract:
Increasing the hydrocarbon recovery rate is one of the most important objectives in the field of hydrocarbons. The elimination of problems that obstruct the flow, such as sulfates or barium sulfate deposits, will increase hydro carbon recovery. In this work, carbon nanotubes are used to solve the sulfate problem. To avoid the precipitation of barium sulfate. Multiwalled carbon nanotubes (MWCNT) were prepared by chemical vapor deposition of gas condensation at 1000 °C and oxidized with an acid mixture at 115 °C for 2 hours, then applied as an adsorbent for the removal of sulfates. The variables Effects such as temperature, adsorbent dose, time, and agitation speed, as well as their interactions during adsorption, were determined and optimized using the response surface meth odology (RSM) via a central composite factorial design (CCF). The experimental data were examined by analysis of variance (ANOVA) and fitted to a second-order polynomial equation. The optimal conditions were an initial concentration of 800 mg/L, an adsorbent dose of 0.14447 g, a pH of 7, and a temperature of 74.21 °C, 530 rpm for 240 min, and a maximum sulfate removal of 96% was achieved. Isotherm models were studied to describe the sulfate adsorption data, and a higher model fitting the Langmuir isotherm was found. Kinetic studies have shown that the adsorption followed a pseudo-second-order reaction. Overall, MWCNTs are promising adsorbents for water treatment and have great potential for application in oil fields to reduce the tartar ion content at the source.
