Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
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- Life cycle analysis of complementary biorefinery and refinery routes to produce ethylene in Mexico(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2022-05-24) Landeros Basurto, Ana Sofía; Álvarez Guerra, Alejandro Juan; tolmquevedo; Santibañez Aguilar, José Ezequiel; Mancilla Méndez, Yasmany; School of Engineering and Sciences; Campus MonterreyEthylene is one of the main building blocks in the chemical production industry. Conventional production routes are expensive and have bigger environmental impacts day by day. These drawbacks can be addressed by comparing existing conventional routes with two alternative biorefinery routes to see if a better option can be found. The conventional routes involve the Steam Cracking of Naphtha and Natural gas. Both routes are energy-intensive and overall expensive. Two alternative “Green Routes” were proposed to compare them against the existing ones and to find if they are sustainable. These routes consist on the production of 1 kg/hr of ethylene via bioethanol dehydration and via bio methanol to olefins. Based on the results obtained in the LCA, the best route is bioethanol dehydration. This can be attributed to the smaller environmental impact that this route has. Literature often mentions that most biorefinery routes strive to be carbon neutral, which is a point in favour for route 3 and 4. Route 4 or biomethanol to olefins production is an attractive option, however, it is also in third place due to the energy demand from the methanol to olefins process. This energy demand puts route 4 in a negative perspective on the overall environmental assessment. The outcome of this study shows that route 4 (biomethanol to olefins) emits 1357.13 kg CO2 eq per kg of ethylene produced. Looking into the behavior of the route, most of the impact can be attributed to block 3 which is responsible for 1187.76 kg CO2 eq per kg of ethylene produced. This result implies that the block that must be optimized is block three, which corresponds to the methanol-to-olefins process, and that if this block were improved, the route would become an attractive alternative.
- Removal of methylene blue from water by adsorption using alginate as activated carbon immobilization agent(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2022-05-24) Torres Bautista, Crhys Lorena Amelia; Álvarez Guerra, Alejandro Juan; tolmquevedo, emimayorquin; Mancilla Méndez, Yasmany; Santibañez Aguilar, José Ezequiel; School of Engineering and Sciences; Campus MonterreyActivated carbon (AC) is an adsorbent widely used in water treatment, however, it has some technical disadvantages, such as its high cost and difficulty to recover. To overcome these drawbacks, AC particles have been encapsulated within a polymeric support, mainly alginate-based. The use of these biological macromolecules results in composites with lower-cost, superior mechanical properties, and higher number of functional groups, advantages that have been attracted the attention of the scientific community. Four adsorbents, activated carbon (AC), alginate (AL), activated carbon/ alginate (AC/AL) and activated carbon, alginate, and bentonite (AC/AL/Bt) were proposed in this work to remove Methylene Blue (MB). The process parameters such as adsorbent diameter, column height, column diameter, mass composition and initial concentration of MB are investigated based on the dynamic simulation results using Aspen Adsorption V11 simulation software. The relationship between the five process parameters and saturation time were studied. Based on the optimized simulation results, AC/AL/Bt obtained the highest saturation time (63020 s) in a Fixed-bed column to treat water contaminated with 25 mg/L methylene blue concentration. Additionally, the suitable process parameters magnitudes are adsorbent particle, column height, column diameter, and mass composition of 1 mm, 2 m, 0.05 m, and 30% AC/ 15% AL/ 55% Bt, respectively. The outcomes of this study suggest the potential of AC/AL/Bt composite for cationic dye removal.
- Evaluation of the usage of ionic liquids as solvents in the crystallization process of acetylsalicylic acid based on the Green Chemistry principles(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2021-12-02) Peña Welsh, Griselda; ALVAREZ GUERRA, ALEJANDRO JUAN; 200196; Álvarez Guerra, Alejandro Juan; puemcuervo, emipsanchez; Mancilla Méndez, Yasmany; Santibañez Aguilar, José Ezequiel; Escuela de Ingeniería y Ciencias; Campus MonterreyThis study proposes an alternate process in the crystallization of acetylsalicylic acid and evaluates the environmental impact of the new process. As a solution, proposes the use of ionic liquids as a substitute for conventional organic solvents. After creating solubility graphics for acetylsalicylic acid in three different ionic liquids, experimentation validated the new experimentation processes. The experiments show a higher yield of acetylsalicylic acid crystals than the yield obtained from conventional organic solvents. Finally, the study proposes a new environmental evaluation tool, the Solvent Greenness Preliminary Evaluation, to evaluate the environmental impact of the crystallization processes with ionic liquids. This tool scores each process's impact without considering the manufacture of the solvents involved in the process. The evaluation scores one of the ionic liquids as the greener option for crystallization.
- Design and modelling of novel process of continuous fermentation for bioethanol production(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2021-10-28) Cruz Castro, Raúl; Álvarez Guerra, Alejandro Juan; puemcuervo; Parra Saldivar, Roberto; Montesinos Castellanos, Alejandro; López Salinas, José Luis; School of Engineering and Sciences; Campus MonterreyThe bioethanol is considered as alternative to swap fossil fuels in transportation, although its potential is blocked by its higher production cost compared to gasoline. The most important challenge in bioethanol research to address is reducing production cost by improving the process performance and efficiency. There are some pathways to overcome this challenge such as in-situ product removal, cell immobilization, and using disruptive reactor geometries. Therefore, disruptive reactor designs in coil tube and CFI geometries are proposed and simulated to understand its improvements compared to conventional straight tubular reactors. To analyze the performance of the proposed reactor design, a complete simulation study is done with the intention to identify the secondary flow and flow inversion effects in the fermentation process. Furthermore, an integrated continuous fermentation systems based on the proposed reactors coupled with pervaporation membrane are proposed and analyzed to determine its technical feasibility. The proposed coil tube and CFI reactors present improved mixing effects provoked by the presence of secondary flow and flow inversion which led to higher conversion rate, product concentration, and productivity, compared to the conventional reactors. And the integrated fermentation systems can offer an enhanced process productivity. Additionally, a statistical analysis was carried out with the simulations results with the intention of generating heuristic and design rules to be used to simplifying the design and operation of the proposed fermentation processes.