Dissertações em Engenharia Química (Mestrado) - PPGEQ/ITEC

URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/2309

O Mestrado Acadêmico iniciou-se em 1992 e pertence ao Programa de Pós-Graduação em Engenharia Química (PPGEQ) do Instituto de Tecnologia (ITEC) da Universidade Federal do Pará (UFPA).

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Acesso aberto (Open Access)
Análise experimental da secagem do corante hidrossolúvel de urucum (Bixa orellana L.) em leito de jorro
(Universidade Federal do Pará, 2016-02-15) SILVA, Adriano Gomes Paixão da; FARIA, Lênio José Guerreiro de; http://lattes.cnpq.br/7428609361678173; https://orcid.org/0000-0002-9534-9998; COSTA, Cristiane Maria Leal; http://lattes.cnpq.br/0581730621014796
The water-soluble dye annatto norbixin salt is mainly used in the pharmaceuticals industry, cosmetics and especially in industrial food sector in breads, sausages, yogurts, confectionery, pasta, cheese, sandwich cookies, juice concentrates and others. The low toxicity and its coloring ability make the annatto norbixin salt a very attractive and convenient dye, replacing many synthetic dyes. These characteristics encourage to seek ways to facilitate the use of natural dyes in the various segments of industry, as well as promoting research about obtaining in order to get a product with the desired characteristics and qualities. This work it is carried out experimental analysis of water soluble dye drying annatto (Bixa orellana L.) in spouted bed, using cassava starch as a carrier agent and particles of low-density poliestileno (LDPE) as an inert material. The extraction of the dye was carried out by immersion and agitation of annatto seeds in 5% potassium hydroxide solution. It is statistically evaluated the influence of the drying process input variables, temperature (70, 80 and 90 ° C), atomization pressure (10, 15 and 20 psi), and atomization of the suspension flow (10, 7 and 8.5 mL/min) one the response variables: efficiency (η), moisture content (U) and norbixin salt content of the dye powder (S), using Statistica®7.0 application. The estimate of the optimum condition of drying within the analyzed experimental area is determined based on the input variables applying the concept of global desirability. The conditions in this work, it was reached a optimum value of Desirability Function considered as very good and that matches the temperature of the drying air 82.6 °C, atomization pressure of 13.7 psi and flow of suspension dye 10 ml / min, generating satisfactory values for the response variables corresponding to 71.69 % yield, 0.06161 g H2O/g dry solids of moisture and 2.3605 % dye of norbixin salt powder.
Acesso aberto (Open Access)
Avaliação das condições de secagem no rendimento e na qualidade do óleo de linhaça (Linum usitatissimum L.)
(Universidade Federal do Pará, 2011-06-20) VALENTE, Maria da Conceição da Costa; COSTA, Cristiane Maria Leal; http://lattes.cnpq.br/0581730621014796; SOUZA, Célio Augusto Gomes de; http://lattes.cnpq.br/0800747860976046
From Asian origin flaxseed (Linum usitatissimum L.) and belongs to the linaceae family and it is obtained from flax. It is considered a functional food, because it contains substances that may prevent diseases such as degenerative and cardiovascular diseases. Flaxseeds are still a major lignans source, that are photochemical compounds similar estrogen, which it may performs cancer-preventative. In addition to being one of the richest sources of α-linolenic acid oil and soluble fibre. The drying is a unit operation, in general, usually means removal of relatively small amounts of water from material by evaporation or by sublimation, applying heat under control conditions. Aiming to analyze the behavior of flax seeds during the drying operation, this study aimed to perform the experimental design and statistically analyze the results used to quantify the influence of air temperature (T), drying time (t) fluidization air velocity (Uf) and solids loading (Cs) on the humidity ratio (Xr), oil yield (Rend.) and the parameters oleochemicals. The estimate of the optimal point of operation was determined according to the input variables by applying the concept of global desirability. Among the conditions set out in this work, the optimal value of the function you want and when T is shifted to high level (72 oC), Uf is shifted to high level (0,83 m/s), t you for the minimum (3h ) and Cs for the secondary level (500 g), thus obtaining: 0.126 to Xr, 36,92 % for Rend.; 4.51 mg KOH/g for IA, 22,52meq O2/g IP and 0,31% for DC. We obtained the sorption isotherms of flaxseed at temperatures 40, 60 and 80 °C. Six mathematical models were applied to analyze the experimental data. The enthalpy and differential entropy were determined by appying Clausius-Clapeyron and Gibbs-Helmholtz equation, respectively. Peleg model and GAB model showed the best fit to experimental data. The enthalpy-entropy compensation theory was applied to the isotherms, indicating that they are enthalpy - controlled. The flaxseed Drying were evaluated in a fixed and fluidized bed dryer, the experimental runs were done at temperatures 40, 60 and 80 °C. Five mathematical models were evaluated and the Midilli et al. model was found to be the best model for describing the flaxseeds drying behavior. It was observed that the effective diffusivity for the flaxseeds increased with increasing drying air temperature. The diffusivity dependence by temperature was described by the Arrhenius equation. It was estimated the activation energy.

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