scholarly journals Proximate composition and kinectics drying of sweet pine nuts compared to typical nuts of Araucaria angustifolia

2021 ◽  
Vol 51 (4) ◽  
Author(s):  
Bruna Valéria Gil ◽  
Amanda Pacheco Cardoso Moura ◽  
Marcos Robson Sachet ◽  
Maria Fernanda Ribas ◽  
Rafael Henrique Pertille ◽  
...  

ABSTRACT: The objective of this research was to determine the proximate composition and kinetics drying of sweet pine nuts compared to typical pine nuts of Araucaria angustifolia. This study is based on the proximate components, color, and duration of pine nuts drying of both types, and the influence of temperature and cutting geometry on the dehydration process. Sweet pine nuts had lower calorific value and carbohydrate content, but higher lipid, dietary fiber, protein, and ash contents when compared to typical pine nuts. Color of sweet pine nuts is light pink whereas the typical pine nut is yellowish-white. Sweet pine nuts were also softer. Drying kinetics of the seeds fit well into the logistic and Thompson models. To accelerate drying rates, we recommend slicing pine nuts into thin cross-sections and drying them at temperatures of 60 °C for typical pine nuts and 70 °C for sweet pine nuts.

2019 ◽  
Vol 5 (12) ◽  
pp. 37-46
Author(s):  
K. Chalov ◽  
Yu. Lugovoy ◽  
Yu. Kosivtsov ◽  
E. Sulman

This paper presents a study of the process of thermal degradation of crosslinked polyethylene. The kinetics of polymer decomposition was studied by thermogravimetry. Crosslinked polyethylene showed high heat resistance to temperatures of 400 °C. The temperature range of 430–500 °C was determined for the loss of the bulk of the sample. According to thermogravimetric data, the decomposition process proceeds in a single stage and includes a large number of fracture, cyclization, dehydrogenation, and other reactions. The process of pyrolysis of a crosslinked polymer in a stationary-bed metal reactor was investigated. The influence of the process temperature on the yield of solid, liquid, and gaseous pyrolysis products was investigated. The optimum process temperature was 500 °C. At this temperature, the yield of liquid and gaseous products was 85.0 and 12.5% (mass.), Respectively. Samples of crosslinked polyester decomposed almost completely. The amount of carbon–containing residue was 3.5% by weight of the feedstock. With increasing temperature, the yield of liquid products decreased slightly and the yield of gaseous products increased, but their total yield did not increase. For gaseous products, a qualitative and quantitative composition was determined. The main components of the pyrolysis gas were hydrocarbons C1–C4. The calorific value of pyrolysis gas obtained at a temperature of 500 °C was 17 MJ/m3. Thus, the pyrolysis process can be used to process crosslinked polyethylene wastes to produce liquid hydrocarbons and combustible gases.


2013 ◽  
Vol 634-638 ◽  
pp. 541-545 ◽  
Author(s):  
Jun Seong Park ◽  
Dae Hee Yun ◽  
Tae Won Ko ◽  
Yong Sung Park ◽  
Je Wan Woo

The kinetics of the Diels-Alder reaction of cyclopentadiene with bis(2-ethylhexyl) maleate has been studied at temperatures between 25 and 100 °C and at atmospheric pressure. The influence of temperature on the kinetic constants was determined by fitting the results to the Arrhenius equation. As a result, fitting line similar with the linear curve of the Arrhenius equation at 25, 30 and 40 °C. However, the fitting curve, at 60, 80 and 100 °C, tended towards the outside of the curve in the form of Arrhenius equation. The ratio of endo/exo was a slight change from increase of the reaction temperature.


2014 ◽  
Vol 955-959 ◽  
pp. 2306-2309
Author(s):  
Shu Bin Zhao ◽  
Pan Zhang ◽  
Xiao Tong Cai ◽  
Dong Fu

The absorption rates of CO2 in diethanolamine (DEA) promoted N-methyldiethanolamine (MDEA) aqueous solution were measured at normal pressure with temperatures ranging from 303.15-323.15K. The influence of temperature and the mass fraction of DEA on the absorption rate of CO2 was illustrated.


2021 ◽  
pp. 130672
Author(s):  
Emmanuelle Ferreira Requião Silva ◽  
Bruna Rosa da Silva Santos ◽  
Lucas Almir Cavalcante Minho ◽  
Geovani Cardoso Brandão ◽  
Márcio de Jesus Silva ◽  
...  

2017 ◽  
Vol 675 ◽  
pp. 56-62 ◽  
Author(s):  
Juan Carlos Gómez Martín ◽  
Shane M. Daly ◽  
James S.A. Brooke ◽  
John M.C. Plane

1998 ◽  
Vol 54 (3-4) ◽  
pp. 131-145 ◽  
Author(s):  
Fenwei Su ◽  
K Hanumantha Rao ◽  
K.S.E Forssberg ◽  
P.O Samskog

Author(s):  
Wilmer Hernán Ponce ◽  
Ernesto Rosero ◽  
Gisela Latorre ◽  
Irvin Zambrano ◽  
Carolina Zambrano ◽  
...  

Use of pine nut husk (Jatropha curcas L.) and rice straw (Oriza sativa L.) for the production of pellets as biofuel Resumen El uso de los biocombustibles sólidos es una de las alternativas para reemplazar a los combustibles convencionales en la producción de energía eléctrica y calorífica. Este trabajo tiene como objeto el aprovechamiento biomásico residual de la cáscara de piñón (Jatropha curcas L.) y paja de arroz (Oriza sativa L) para la producción de pellets como biocombustible sólido. Se aplicó mediante un diseño experimental (Simplex-lattice) la mezcla en proporciones de 100%-0%, 75%-25%, 50%-50%, 25%- 75%,0%-100% respectivamente. Se efectuaron análisis a la materia prima y producto terminado en porcentaje del contenido de humedad, cenizas, volátil, carbono fijo, adicionalmente el contenido de celulosa y lignina a las materias primas. Para la obtención de pellets, se empleó un equipo de pelletizado marca KL 1500, los pellets se elaboraron con recirculación para eliminar el exceso de humedad para el mejoramiento de textura y dureza. Las mezclas de las biomasas lignocelulósicas, que presentaron un mayor contenido de carbono fijo fueron la M2 (75%-25%) =16,53 ±3,2 % y M5 (0%-100%) =23,51 ±0,72%, en lo referente a material volátil fueron la M1 (100%-0%) =82,37±2,0% y M2 (75%-25%) =81,57±3,47%. El poder calorífico calculado reveló que con una mezcla del 75% de paja de arroz con un 25% de cáscara de piñón se obtiene un poder calorífico de 29,21±0,1 Mj/Kg y la mezcla de 50% de paja de arroz y 50% de cáscara de piñón, genera un valor de 29,01±0,01 Mj/Kg. Concluyendo que las mezclas mencionada puede ser aprovechada para la generación de calor. Palabras clave: Biocombustible sólido; biomasa; pellets; arroz; piñón. Abstract The use of solid biofuels is one of the alternatives to replace conventional fuels in the production of electrical and heat energy. The objective of this work is the residual biomass utilization of the pine nut husk (Jatropha curcas L.) and rice straw (Oriza sativa L) for the production of pellets as solid biofuels. The mixture was applied using an experimental design (Simplex-lattice) in proportions of 100% -0%, 75% -25%, 50% -50%, 25% - 75%, 0% -100% respectively. Analysis of the raw material and finished product were carried out as a percentage of the moisture, ash, volatile, and fixed carbon content, in addition to the cellulose and lignin content of the raw materials. To obtain pellets, a KL 1500 brand pelletizing equipment was used, the pellets were recirculated to remove excess moisture to improve texture and hardness. The mixtures of lignocellulosic biomasses, which had a higher fixed carbon content were M2 (75% -25%) = 16.53 ± 3.2% and M5 (0% -100%) = 23.51 ± 0, 72%, regarding volatile material, were M1 (100% -0%) = 82.37 ± 2.0% and M2 (75% -25%) = 81.57 ± 3.47%. The calculated calorific value revealed that with a mixture of 75% of rice straw with 25% of pinion husk, a calorific value of 29.21 ± 0.1 Mj / Kg is obtained and the mixture of 50% of rice straw and 50% of pinion shell, generates a value of 29.01 ± 0.01 Mj / Kg. Concluding that the mentioned mixtures can be used for heat generation. Keywords:  Solid biofuel; biomass; pellets; rice; pinion.


2016 ◽  
Vol 5 (2) ◽  
Author(s):  
Sara F. A. Baidab ◽  
Solafa A. Hamad ◽  
Abdel Halim R. Ahmed ◽  
Isam A. Mohamed Ahmed

 In this study, sorghum Feterita malt extract was used to prepare carbonated beverages flavored with traditional Hulu-mur spices extract.  The beverages produced were assessed for their physicochemical, sensory, and nutritional qualities. Malting (3–5 days) of the Feterita grains showed significant (P ≤ 0.05) differences in proximate composition from that of unmalted grains. Protein and sugars increased significantly (P ≤ 0.05) with increased the malting time (days), while there was a significant (P ≤ 0.05) reduction in oil and starch  content  during malting progress. The kilning temperature of 150°C for 20 minutes was found to produce the most acceptable Hulu-mur carbonated beverage analogue in terms of flavor and taste. Significant differences (P ≤ 0.05) were observed in physicochemical and nutritional qualities between the Hulu-mur analogue carbonated beverage and commercial non-alcoholic beverage. The Hulu-mur carbonated beverage analogue was rich in Na, K, Ca, and Fe (26.45, 21.84, 24.00, and 0.57 mg /100 g, respectively) compared to levels of the same minerals in the non-alcoholic beverage (22.31, 8.19, 22.00 and 0.15 mg/100 g, respectively). The Hulu-mur analogue also had a higher calorific value (35.85 kcal /100 mL) compared to the non-alcoholic beverage (32.96 kcal/100 mL).


2015 ◽  
Vol 228 ◽  
pp. 237-241
Author(s):  
Magdalena Popczyk ◽  
B. Łosiewicz

The Ni+MoS2composite coatings were prepared by electrodeposition under galvanostatic conditions from the Ni-plating bath containing suspended MoS2powder (100 mesh). Investigations of hydrogen evolution reaction (HER) were carried out using steady-state polarization measurements and electrochemical impedance spectroscopy (EIS) in 5 M KOH solution on the coatings obtained at 30, 40, and 50°C. It was found that the kinetics of the HER on the Ni+MoS2coatings decreases with the increase in the electrodeposition temperature of the coatings. This effect is attributed to decreasing content of MoS2(from 26.4 to 18.0 wt.%) embedded into the Ni matrix as composite crystalline component having the electrocatalytic properties towards the HER and/or surface development of the coatings. The higher amount of MoS2was embedded, the more porous electrodes containing pear-shape pores on the surface were produced what was detected by EIS.


Sign in / Sign up

Export Citation Format

Share Document