Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry最新文献_第7页

Continuous assessment strategies as a way to motivate students in Technology careers 持续评估策略作为激励学生从事技术职业的一种方式

Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry Pub Date : 2022-07-18 DOI: 10.55815/401090

M. Jiménez‐Rosado, V. Perez-Puyana, Alberto Romero García, C. Bengoechea, Manuel Felix

引用次数: 0

Optimum economic design of an acetylated gelatinized starch plant from Manihot esculenta Crantz 马尼奥特乙酰化糊化淀粉装置的经济优化设计

Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry Pub Date : 2022-07-18 DOI: 10.55815/401374

O. Pérez Navarro, Amanda Acosta Solares, Erenio González Suárez, Nestor Ley Chong

{"title":"Optimum economic design of an acetylated gelatinized starch plant from Manihot esculenta Crantz","authors":"O. Pérez Navarro, Amanda Acosta Solares, Erenio González Suárez, Nestor Ley Chong","doi":"10.55815/401374","DOIUrl":"https://doi.org/10.55815/401374","url":null,"abstract":"Due to the technological, energetic and economic impact of spray drying in the production of acetylated gelatinized starch from native starch of Manihot esculenta Crantz (Cassava), the objective of this work is to optimize the dynamic profitability indicators considering as optimization criteria the production capacity and the drying air temperature, and establishing the detailed design of the installation under optimum conditions. A composite central experimental design was generated for the indicators Net Present Value (NPV), Internal Rate of Return (IRR) and Discounted Payback Period (DRP). The regression models of the profitability indicators were optimized by ridgeline analysis through the Response Surface Methodology. For the evaluation of the indicators, the economic indexes of the process were determined, after technological selection, material and energy balances and technological design. The optimum economic variant has an NPV of USD 2 862 010, an IRR of 45,51 % and DRP of 3 years and is reached when 3454,45 tcassava/y are processed and the air feed temperature to the spray dryer is 184 °C, but the energy index is not favorable. An option that adequately combines energy, environmental and technical-economic results can be used by processing 3150 tcassava/y with 130 °C in the air feed to the dryer, reaching favorable economic results with NPV of USD 2 767 166, IRR of 37,99 % and DRP of 3,45 years and drastically reducing fuel consumption, although increasing the size of the spray dryer.","PeriodicalId":263806,"journal":{"name":"Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131137868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Growth kinetics of Bacillus subtilis (Bal3) for production of cellulolytic crudes used in the bioethanol production industry 枯草芽孢杆菌(Bal3)生产用于生物乙醇生产工业的纤维素裂解原油的生长动力学

Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry Pub Date : 2022-07-18 DOI: 10.55815/400724

Carmen Salvador Pinos, O. Pérez Navarro, Yailet Albernas Carvajal, Leyanis Mesa Garriga, Juan Jácome Navarrete, Erenio González Suárez

{"title":"Growth kinetics of Bacillus subtilis (Bal3) for production of cellulolytic crudes used in the bioethanol production industry","authors":"Carmen Salvador Pinos, O. Pérez Navarro, Yailet Albernas Carvajal, Leyanis Mesa Garriga, Juan Jácome Navarrete, Erenio González Suárez","doi":"10.55815/400724","DOIUrl":"https://doi.org/10.55815/400724","url":null,"abstract":"Biotechnologically manageable microbiota that can produce enzyme complexes of interest is a thriving research field. After careful collection and laboratory culture, the microorganisms can develop hydrolysis and fermentation processes in bioreactors. Kinetic models for their growth are applied, being the most used those of Monod, Moser, Blackman and Powell, which combine mathematical models and experimental work. \u0000The objective of this study was to determine the kinetic behavior of Bacillus subtilis (Bal3) to size the equipment needed to obtain enough amount of enzimes to produce 500 hl of ethanol at 70% per day. A medium composed of 60 g of sugarcane bagasse and 350 ml of whey in 1L of water with 0.02 g of inoculum was placed in a 2L Bioflo/CelliGen 115 bioreactor for 130 h at 20° C and 150 rpm. The pH ranged from 6.8 (start) to 5.8 (end). A biomass-substrate yield of 19.34% and a biomass productivity of 0.048 g/L per hour were obtained. With the kinetic models of Velhurs-Pearl, Pirt and Luedeking-Piret, the mass balance was performed and the equipment volume was calculated. Monod's model was considered to adequately represent the growth behavior of the bacteria.","PeriodicalId":263806,"journal":{"name":"Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134593425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of a formulation with Agave fructans as a carrier polymer on the quality properties of Chayote (Sechium edule) powder 以龙舌兰果聚糖为载体聚合物的配方对佛手柑粉质量性能的影响

Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry Pub Date : 2022-07-18 DOI: 10.55815/401145

Darvin Ervey Jimenez Sánchez, M. Calderón‐Santoyo, E. Herman‐Lara, Elda M. González-Cruz, J. A. Ragazzo‐Sánchez

{"title":"Effect of a formulation with Agave fructans as a carrier polymer on the quality properties of Chayote (Sechium edule) powder","authors":"Darvin Ervey Jimenez Sánchez, M. Calderón‐Santoyo, E. Herman‐Lara, Elda M. González-Cruz, J. A. Ragazzo‐Sánchez","doi":"10.55815/401145","DOIUrl":"https://doi.org/10.55815/401145","url":null,"abstract":"The native agave fructans as carrier agent can be an alternative to improve quality properties of chayote powder, since in this form have some technological applications such as sweeteners and stabilizers. The objective of this study was to diminish the added maltodextrin and evaluate the effect of fructans concentration as carrier agent on the quality properties of chayote powder. The effect of the two stabilizing additives for chayote juice was studied through calorimetry, FT-IR spectroscopy and some physicochemical properties. The samples were prepared with 5, 7 and 10% maltodextrin concentration, added with 0, 2 and 4% fructans. The spray drying process was carried out with inlet temperature of 110, 115 and 120 °C. The treatments with added fructans showed lower moisture content than treatments with maltodextrin only. The powder stability was observed in the sorption isotherms, which presented a higher degree of hysteresis during storage where fructans were added. The addition of fructans significantly increased the glass transition temperature (Tg) of the powder. The FT-IR showed the ability of agave fructans to water retention. The micrographs revealed spherical particles in a range from 16 to 105 μm. The evaluation of physicochemical properties confirmed the addition of fructans confers stability to chayote powder.","PeriodicalId":263806,"journal":{"name":"Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry","volume":"170 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114839756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluación de la calidad del agua del pozo de la comunidad “Soledad” del Municipio II Frente, Santiago de Cuba 对古巴圣地亚哥第二阵线市“Soledad”社区井的水质进行评估

Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry Pub Date : 2022-07-18 DOI: 10.55815/400728

Leandro León-Duharte, María de los Ángeles Arada Pérez, Martín Blázquez Cutiño, Edgar Segura Falcón

引用次数: 0