title: Copper removal from oil-field brine by coprecipitation.
abstract: The present study aims at investigation of copper removal from oil-field brine by coprecipitation process. The produced brine containing heavy metals is usually returned to the reservoir for water flooding or is discarded to the surroundings. Therefore, surface waters or underground waters may be polluted due to probable contact to these discarded waters. Removal experiments were carried out at room temperature in a bench-scale crystallizer equipped with a draft tube. In order to gain an insight into the influence of soluble compounds in the industrial natural brine on the precipitation process, some comparative experiments were performed both on a sample of natural brine and on a synthetic simulated brine in the absence of natural impurities. A metal removal practice by coprecipitation of copper through CaCO(3) precipitates induced by reaction of Na(2)CO(3) and CaCl(2) reduced the copper concentration (Cu(2+)) from 0.27 ppm in the synthetic brine to 0.06 ppm. This removal of 78% required only 1g of precipitate per 0.15 mg copper metal. Analysis of the experimental results suggested that about 5% of the copper removal from the synthetic brine was through the mechanism of incorporation into the crystal lattice, and around 95% was through the adsorption on the crystal faces.
authors.affiliation: Chemical and Petroleum Engineering Department, School of Engineering, Shiraz University, post code 7134851154, Shiraz, Iran.
authors.forename: Jafar
authors.initials: J
authors.lastname: Khosravi
authors.forename: Abdolmohammad
authors.initials: A
authors.lastname: Alamdari
mesh_terms: D000327:Adsorption; D002119:Calcium Carbonate; D011232:Chemical Precipitation; D003300:Copper / Q000302:isolation & purification*; D019652:Extraction and Processing Industry; D005648:Fuel Oils; D007220:Industrial Waste / Q000517:prevention & control*; D008670:Metals / Q000302:isolation & purification; D010865:Pilot Projects; D012492:Salts / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification
chemical_list: D005648:Fuel Oils; D007220:Industrial Waste; D008670:Metals; D012492:Salts; D014874:Water Pollutants, Chemical; C017082:brine; D003300:Copper; D002119:Calcium Carbonate