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Papers by Antonio Carlos Lisbôa

DOAJ (DOAJ: Directory of Open Access Journals), Oct 1, 2017

Anais do 11º Congresso Brasileiro de Petróleo e Gás, 2022

Canadian Journal of Chemical Engineering, Oct 1, 1992

The Petrobras oil shale retorting process, utilizes the particle range of +1/4 inch - 3 1/2 inche... more The Petrobras oil shale retorting process, utilizes the particle range of +1/4 inch - 3 1/2 inches. The UPI plant in Sao Mateus do Sul has over 106,000 hours of operation, has processed over 6,200,000 metric tons of shale and has produced almost 3,000,000 barrels of shale oil. However, the nature of the raw oil shale is such that the

Brazilian Journal of Chemical Engineering, Jun 1, 2005

Chemical Engineering and Processing, Nov 1, 2006

Polymer film coating has become widely used in pharmaceutical, chemical and food industries today... more Polymer film coating has become widely used in pharmaceutical, chemical and food industries today. Such wide acceptance arises from the possibility to routinely use aqueous coating formulations. The technology applied to coat particles depends mainly on the ...

Chemical engineering transactions, 2017

The organic and mineral matter are directly linked to the oil shale, allowing multiple reactions ... more The organic and mineral matter are directly linked to the oil shale, allowing multiple reactions in parallel that may result in different behaviors. An in-depth study using the techniques of Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) non-isothermal were performed. The oil shale was extracted from Basin Irati being supplied by Petrobras/SIX located in the city of Sao Mateus do Sul, Parana, Brazil. The parameters analysed through shale pyrolysis kinetics were evaluated using the ASTM E-698 and Flynn-Wall- Ozawa (FWO) methods, with analysis and a comparison of parameters the activation energy and exponential factor. The experiments were done at different heating rates, from 298 K - 1,173 K for TGA and 298 K - 873 K for DSC both with nitrogen atmosphere flow of 50 mL/min. The results showed a correlation between TGA and DSC and that, for both processes, the shale underwent thermal decomposition in three steps. Activation energy values decreased througho...

Spouted and Spout-Fluid Beds

A common set of reactions, given in Table 15.1, occurs when carbonaceous solids undergo thermal p... more A common set of reactions, given in Table 15.1, occurs when carbonaceous solids undergo thermal processing. Whether the aim is pyrolysis, gasification, or combustion, each of these reactions occurs in some parts of the reactor because of gas–solids contacting. In this chapter, we consider, in order, gasification as an endothermic process to generate H 2 and CO mixtures for fuel or synthesis gas, pyrolysis as a process to generate useful tars (or liquids), and combustion as a process to produce heat. Gasification background Most commercial gasifiers use coal as feed, and may be classified by the type of solids–gas contacting (moving, entrained, fluidized, or spouted bed), by the state of the ash (dry, agglomerated, or molten), and by the oxidant (air, air–steam, or oxygen–steam). A low-calorific-value gas results from air–steam gasification, and a medium-calorific-value gas from using steam or steam–oxygen mixtures. The carbonaceous feedstock may be fed as a dry solid, a sludge, or a slurry. Performance measures can be identified for comparing gasifiers of different designs and operating conditions. For production of fuel gases, the heating value of the produced gas is important and is usually reported on a dry gas basis. For synthesis gas or pure hydrogen production, the molar ratio of H 2 ∕CO leaving the gasifier is critical. Low tar yields are usually beneficial, unless a raw fuel gas is desired. For sizing scaled-up gasification processes, throughput of solids feed per unit cross-section of reactor (kg/m 2 s) is of major importance.

Ullmann's Encyclopedia of Industrial Chemistry, 2000

Oil shale, the Jargest reserve of fossil fuels in the world, has been the subject of rnany invest... more Oil shale, the Jargest reserve of fossil fuels in the world, has been the subject of rnany investigations. These investigations has involved studies related to kinetic models, as well as heat and mass transfer regarding the pyrolysis reaction. Due to oil shale complex strnctnrea sedimentary rock comprising organic matter, named kerogen, scattered il an inert matrixthe studies have diverged about the pyrolysis or devolatilization mechanism. Most researches indicate the mechanism follows the shrinking core model (SCM) or the homogeneous model. As the devolatilization mechanism is important to the design of Pyrolysis reactors, the objective of the present work was to study this mechanism. In order to do that, parallelepipedic oi! shale particles, measuring 0.06 m x 0.04 m x 0.03 m, were partially pyrolyzed in a muffie finnace under inert atmosphere. Subsequently, the particle was severed to expose an inner cross section. Samples were collected and submitted to thennogravimetric analysis (TGA) to obtain the organic matter profile within the particle. During each pyrolysis run, the temperatores at the particle center and surface were recorded. The results indicated that the devolatilization mechanism do not follow the shrinking core model. It follows more likely the homogeneous model, in wbich the different organic matter content throughout the partially pyrolyzed shale particle is accounted for by the temperature gradient within the particle. This work also proposes a mathematical model to describe the temperature profiles within the particle along the reaction. Experimental data were obtained in a home-made reactor wbich allowed sample weight measurement along the runs. The model and experimental results indicate the importance of the endothermic heat of reaction, wbich has been usually disregarded, as well as the importance of changing thermal conductivity.

Anais do 11º Congresso Brasileiro de Petróleo e Gás