CHEMICAL EQUILIBRIUM STUDY OF SYSTEMS RELATED TO BIOFUELS – TEACHING EXPERIENCE WITH THERMODYNAMIC ANALYSIS OF HYDROGENATION OF VEGETABLE OILS

Total hydrogenation of vegetable oils to yield hydrocarbons is an emerging process for production of biofuels. Some researchers have been chosen tristearate as a model compound to represent vegetable oils in the calculations. The first problem is that its thermodynamic data were not available in literature, their values were estimated by using the Joback’s contribution method. Based on the comparison to  enthalpy of formation estimated in this work and in Smejkal et al., it was concluded that the chosen method can influence in the result of thermodynamic data. In this work, we realised that the basic thermodynamic analysis of the reaction system was performed presenting some misconceptions and problems which must be better discussed and checked. Calculations were done in classroom and as home-work, then the results have pointed out corrections

MAGNETIC FIELD EFFECT IN THE COAGULATION PROCESS FOR TREATMENT OF WATER CONTAMINATED WITH SURFACTANT (LAS)

The production of cleaning supplies, however, results in the generation of large quantities of polluted wastewater commonly contaminated with surfactants such as lauryl sodium sulphate (LAS). There is an actual need to seek factors intensifying the treatment processes of the wastewaters from industry cleaning supplies. The new methods which not required extension of existing plants or building very expensive reactors are still searching. In recent years much more attention has been directed to the possibility of improvement of waste water treatment by static magnetic field as auxiliary. The aim of this study was to determine the impact of constant magnetic field as well as the integration of this technique with the famous technique used for wastewater treatment which is coagulation by clorate aluminium as a novel method for treatment. This new method has been found to be a useful method for removing turbidity, total solids (TS) and chemical oxygen demand (COD) from chemically treated wastewater. doi: https://doi.org/10.18540/244694160202201611