RemoÃÃo de Ãcidos naftÃnicos presentes na mistura modelo de querosene de aviaÃÃo utilizando adsorventes tipo perovsquitas modificadas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

In this work were prepared adsorbents of type perovsquitas La1-xMgxNiO3, where x = 0, 0.25, 0.5, 0.75, 1.0. The addition of magnesium resulted in increased basicity of the material and consequently the affinity of the acids. The adsorbents prepared materials were characterized by atomic absorption espectrofometria (AA), X-ray diffraction (XRD) measurement of surface area for adsorption of N2 (BET), thermogravimetric analysis (TGA) and differential thermogravimetry (DTG). The results of characterization for the prepared adsorbents indicated that the incorporation of magnesium is not committed to mesopores structure. Kinetic studies of adsorption of naphthenic naphtha acidity was performed using a mixture dodecanoic acid / n-dodecane. The best result was presented with the adsorbent La0, 25Mg0, 75NiO3 with Cs = 2.0 g of acid / g adsorbent and 38% yield of the removal of acid. Isotherms of adsorption equilibrium for this adsorbent showed maximum adsorption capacity of 0.68 g of acid / g of adsorbent, and type III behavior. The kinetics of adsorption was modeled considering a model of Linear Driving Force. The main objective of this work was the removal of naphthenic naphtha acidity of aviation kerosene (QAV) with use of the adsorbent type perovsquita La1-xMgxNiO3. The corrosion by naphthenic acids at high temperatures in the refining units and one of the biggest problems at refineries around the world, to cause poisoning of the catalyst and stop the high operational cost. The National Agency of the Petrel, Natural Gas and Biofuels (ANP) provides a specification for marketing of QAV, designed exclusively for use in aircraft turbines, throughout the national territory. With respect to this specification and total acidity of 0015 mg KOH / g of crude. The oils are increasingly national acids, stimulating the search for new and efficient methods of mitigation. Current forms of mitigation of naphthenic naphtha cause corrosion problems in the operational and econemica. The process of adsorption has the advantage of being able to recover the Orgon acids, which are precursors to the preservation of wood products, surfactants and additives for lubricants, so no waste is formed from pollutants, contributing to the environment, which is a key feature to develop a process today

ASSUNTO(S)

acidez naftÃnica engenharia quimica qav qav naphthenic acids perovsquita la1-xmgxnio3 perovsquita la1-xmgxnio3

ACESSO AO ARTIGO

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