Evaluatcn of Supercritical Carbon Dioxide Spray Technology to Reduce Solvents in a Wood Finishing Process
نویسنده
چکیده
The purpose of this evaluation was to provide an objective evaluation of the use of supercritical carbon dioxide (CO,) as an alternative technology for spray applied in wood finishing processes using reduced solvent formulations. Union Carbide has pioneered this technology under the UNICARBTM trademark. In the UNICARBTM process, the solvent-like properties of supercritical CO, are employed to replace a portion of the organic solvent in the conventional coating formulation. The supercritical CO, acts as a diluent solvent to thin the viscous coating just prior to application so that the coating can be atomized and applied with a modified spray gun. According to Union Carbide, 30 to 80 percent of the organic solvent in a coating formulation can be replaced with the supercritical fluid.
منابع مشابه
Technical Development of the Supercritical Fluid Spray Process for the Application of Coatings
Technical development and commercial implementation of the supercritical fluid spray process have produced the surprising result that coating appearance and performance can actually be improved by removing 60 to 80 percent of the organic solvent from solvent-borne coating formulations. Unlike normal diluent solvents and water, the decompressive release of supercritical carbon dioxide during spr...
متن کاملAn Environmental Friendly Process for Extraction of Active Constituents from Herbal Plants
Conventional methods for extraction of the active constituents from herbal plants, in addition to their high processing costs, are harmful to the environment owing to their time and energy consumption, uncontrollable parameters, use of toxic and dangerous solvents, loss of the extract, thermal instability, the contamination of the product with organic solvents and the loss of water-soluble comp...
متن کاملSynthesis of polyvinyl pyridine/C60 conjugates in supercritical carbon dioxide*
In the present investigation efforts have been made to synthesis polyvinyl pyridine (PvPy) /C60 conjugates through 2, 2-azobisisobutyronitrile (AIBN) initiated insitu polymerization of PvPy in scCO2.The process of synthesis was monitored under different reaction conditions ranging 1200-1800psi, 60-90 oC over 6 hours. The progress of polymerization was monitored rheoviscometrically. The concentr...
متن کاملAn Evaluation of Supercritical Drying and PEG/Freeze-drying of Waterlogged Archaeological Wood
Supercritical carbon dioxide has replaced many liquid organic solvents in industry due to its tunable solvent properties, environmental friendliness, and easily achievable critical parameters. The unique properties of supercritical fluids in general, such as gas-like diffusivity and zero surface tension, make them particularly applicable to the field of conservation. This presentation reports o...
متن کاملSolubility Prediction of High Molecular Weight n-Paraffins in Supercritical Carbon Dioxide
Solubility of high molecular weight n-paraffins in supercritical carbon dioxide has been a matter of interest to many researchers. However, not sufficient solubility experimental data are available although the methods by which the experimental data are obtained have many varieties. Utilizing cubic equations of state is an effective method for solubility prediction of n-paraffins in supercr...
متن کامل