Fully-continuous Supercritical Fluid Extraction of Naphthalene from Soil Slurries
نویسندگان
چکیده
The research objective was to build a fully-continuous lab-scale supercritical fluid extraction process to remove naphthalene from soil slurries. Both the carbon dioxide and the soil slurry were pumped into an extraction vessel simultaneously and continuously for the duration of an experimental run. Delhi Loamy Sand spiked with approximately 10 000 ppm (wt) of naphthalene and water comprised the soil slurry. Carbon dioxide with no added modifiers was used as the supercritical fluid. The operating temperatures of the carbon dioxide remained constant at 43C while the slurry temperature varied from 40 to 80C. The pressure ranged from 5.61 MPa to 7.86 MPa. For most of the experiments a 0.3% soil content was used, but later experiments were as high as 7%. The mass transfer coefficients were as high as 4.6*10 s. These preliminary tests revealed that a fully-continuous SFE operation is possible and that with some optimization, a full-scale system would be feasible thus increasing the application of SFE not only in the extraction of contaminants from soil but also into other applications of SFE as well.
منابع مشابه
Extraction and Recovery of Polycyclic Aromatic Hydrocarbons in Petroleum Contaminated Soils Using Supercritical Water by Response Surface Methodology
Finding an environment-friendly and affordable method to remove contaminated soils from Polycyclic Aromatic Hydrocarbons (PAHs) has now become an attractive field for researchers, with super-critical fluid extraction being an innovative process in the field of contaminated soil treatment. Extraction with super-critical fluid is a simple and rapid extraction process that uses super-critical flui...
متن کاملExtraction and Recovery of Polycyclic Aromatic Hydrocarbons in Petroleum Contaminated Soils Using Supercritical Water by Response Surface Methodology
Finding an environment-friendly and affordable method to remove contaminated soils from Polycyclic Aromatic Hydrocarbons (PAHs) has now become an attractive field for researchers, with super-critical fluid extraction being an innovative process in the field of contaminated soil treatment. Extraction with super-critical fluid is a simple and rapid extraction process that uses super-critical flui...
متن کاملSub and Supercritical Decontamination of Oil-Based Drill Cuttings: A Review
Drill mud is a fluid which is used in oil extraction industries in order to cool and lubricate the drill bit. Due to containing numerous toxic components, it is considered as a hazardous waste which must be treated before discharging to the environment. Current separation techniques for drill cutting treatment can be categorized into three main categories of physical (dewatering), physiochemica...
متن کاملDevelopment of New Continuous Multifunctional Charging and Discharging Supercritical Fluid Extraction Device
General principles of supercritical fluid extraction technology to raise efficiency are summarized and concluded in this paper. It generalized the present domestic situation of relative research and developed proposals towards kind of charging and discharging continuous components by a new supercritical fluid extraction .It also introduced structures and working principles of device. Keywords— ...
متن کامل