Recent Innovations in Chemical Engineering最新文献

{"title":"Study on Adsorption of Ag+ by Waste Tea： Adsorption Kinetics, Thermodynamics, Isotherm Properties","authors":"Q. Zhai, Xiao-dong Li","doi":"10.2174/2405520416666230214100228","DOIUrl":"https://doi.org/10.2174/2405520416666230214100228","url":null,"abstract":"\u0000\u0000In order to explore the adsorption effect of tea on heavy metal ions in industrial waste water, Ag+ is used as the research object in this paper.\u0000\u0000\u0000\u0000In recent years, heavy metal pollution in water has seriously affected human health and the stability of ecological environment. In order to reduce the harmfulness of heavy metals, various countries have issued a variety of control standards for heavy metals in water, there are still great restrictions in the prevention and control technology and level of heavy metal pollution. Therefore, how to effectively treat the heavy metal pollution in water has become a hot topic in the field of water pollution management.\u0000\u0000\u0000\u0000The optimized conditions of the adsorption are obtained. Properties of the thermodynamics, adsorption kinetics, adsorption isotherm are obtained.\u0000\u0000\u0000\u0000In order to determine the best adsorption conditions for Ag+, the influence of factors such as pH value, initial concentration of Ag+, tea dosage, contact time and adsorption temperature on the adsorption effect of tea is studied. The thermodynamics, adsorption kinetics, adsorption isotherm are studied.\u0000\u0000\u0000\u0000The results showed that when temperature is 25C, the pH of solution was 3.5, the amount of adsorbent was 2.5g/L, the initial \u0000concentration of Ag+ was 125μg/Land the contact time was 30min, the adsorption rate was the highest, reaching 98.11%. The thermodynamic \u0000study of adsorption showed that at room temperature and above (298.15 - 318.15K), ΔG0 < 0, indicating that the adsorption process can \u0000be spontaneous. The value of ΔGo in this study is between -20 and -80 kJ/mol, indicating that this is a physicochemical adsorption \u0000process. ΔHo = -80.111 kJ/mol < 0, indicating that the adsorption process of Ag+ is exothermic. ΔSo = -188.977 J/(mol·K)<0, \u0000indicating that the adsorption is a process of entropy reduction. The adsorption kinetics study showed that the adsorption equilibrium \u0000capacity of different concentration had a large gap with the experimental results, and the correlation coefficient was small by fitting \u0000the quasi-first-order kinetic equation and combining with the experimental measurements.When the quasi-second-order kinetic equation was \u0000used, the calculated values of the equilibrium adsorption capacity of each concentration were basically close to the experimental measured \u0000values, and the correlation coefficient was large, so the kinetics of the adsorption system of Ag+ by tea conformed to the \u0000quasi-second-order kinetic equation. The adsorption isotherm of this adsorption process is accorded with Freundlich model and belonged to \u0000a heterogeneous adsorption.\u0000\u0000\u0000\u0000Tea is a good adsorbent and has a potential for adsorption of Ag+ .\u0000\u0000\u0000\u0000No\u0000","PeriodicalId":38021,"journal":{"name":"Recent Innovations in Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45173247","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}

{"title":"Meet the Editorial Board Member","authors":"Ying Zhou","doi":"10.2174/240552041601230505092735","DOIUrl":"https://doi.org/10.2174/240552041601230505092735","url":null,"abstract":"","PeriodicalId":38021,"journal":{"name":"Recent Innovations in Chemical Engineering","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135146397","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}

{"title":"Silicon Prismanes: Calculation And Comparison Of Heats Of Formation","authors":"E. Zauer, Alexander B. Ershov","doi":"10.2174/2405520416666230102113231","DOIUrl":"https://doi.org/10.2174/2405520416666230102113231","url":null,"abstract":"\u0000\u0000The objects of this work are silicon prismanes - new high-energy materials that can be used in various electronic, optoelectronic, thermoelectric, and biological fields and compete with traditional chemical energy carriers. However, only compounds with hexasilacubane and octasilacubane have been synthesized to date. Synthesis of other silapismanes, and even more so polysilaprismanes, has not yet been achieved. Therefore, both the “simplest” and the highest silaprismanes are studied mainly theoretically, including by quantum chemistry methods.\u0000\u0000\u0000\u0000to expand information about the enthalpies of formation of \"simple\" (n=2) and multilayer (n=3–7) silicon prismanes using semi-empirical calculation methods; bond lengths Si-Si and Si-H; compare them with the results of ab initio calculations already available in the literature.\u0000\u0000\u0000\u0000The geometry was optimized by semi-empirical methods, the enthalpies of formation, Si-Si and Si-H bond lengths, and the bond angles of the bilayer (m = 3 - 12) and some multilayer (n = 3 - 8 and m = 3 - 9) silaprismanes were determined. Comparison with the enthalpies of formation obtained using ab initio calculations shows that the enthalpies of formation obtained by the MINDO / 3 method (Modified Intermediate Neglect of Differential Overlap, version 3) are closest to the results of ab initio calculations of two-layer silicon prismanes; and for multi-layers - by the AM1 method (Austin Model 1). Large differences in the lengths of Si-H bonds determined ab initio and semi-empirically by both methods are not observed. As for the Si-Si bonds, the results of semi-empirical methods indicate the presence of the so-called auxetic effect in multilayer silaprismanes.\u0000\u0000\u0000\u0000We believe that in the future, the calculations carried out in this work and a comparative assessment of the enthalpies of formation obtained by calculation methods will help to overcome the problems associated with the synthesis of silicon prismanes.\u0000","PeriodicalId":38021,"journal":{"name":"Recent Innovations in Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47522007","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}

{"title":"Experimental Studies and Comparative Analyses on Apparent\u0000Viscosity of Solid Particle, Droplet, and Bubble Suspensions","authors":"Mingjun Pang, Shihuan Zhang, Rui Niu","doi":"10.2174/2405520416666230102113211","DOIUrl":"https://doi.org/10.2174/2405520416666230102113211","url":null,"abstract":"\u0000\u0000Suspensions can be frequently seen in natural, industrial, and\u0000agricultural processes. The addition of dispersed phases (such as solid particles, droplets, and bubbles) greatly affects the rheological properties of matrix liquid. Therefore, it\u0000is very important to understand the rheological properties of particle suspensions for\u0000optimizing production processes and improving process efficiencies.\u0000\u0000\u0000\u0000To explore qualitatively the physical law and internal mechanism of the apparent viscosity of suspensions formed by a Newtonian liquid containing solid particles,\u0000droplets, and bubbles, respectively.\u0000\u0000\u0000\u0000The apparent viscosity of suspensions was measured and analyzed using a\u0000rotary rheometer (MCR302), and the evolution of particles was recorded using a highspeed camera (Revealer 2F01M).\u0000\u0000\u0000\u0000When the deformation of deformable particles (such as bubbles or water droplets) is slight (close to a sphere in shape), or the arrangement of rigid particles is disordered, the relative viscosity of suspensions is greater than 1. When the deformation of\u0000deformable particles is large (greatly deviating from a sphere in shape) or rigid particles\u0000are arranged in order, the apparent viscosity of suspensions decreases and the relative\u0000viscosity of suspensions containing deformable particles is less than 1.\u0000\u0000\u0000\u0000The apparent viscosity of suspensions is closely related to particle shape,\u0000particle arrangement, and volume fraction. The higher volume fraction of particles significantly influences the apparent viscosity of suspensions.\u0000","PeriodicalId":38021,"journal":{"name":"Recent Innovations in Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43380150","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}

{"title":"Enhancing the overall heat transfer coefficient through tube rotation of a heat exchanger: An analytical approach","authors":"D. Pal, N. Subrahmanyam, Jayadeekshitha M, K. Raj, Mahesh Nallamothu","doi":"10.2174/2405520416666230102114948","DOIUrl":"https://doi.org/10.2174/2405520416666230102114948","url":null,"abstract":"\u0000\u0000Flow in an annulus between two concentric cylinders or pipes is very often observed, ranging its applications in many streams, namely, in steam generators, condensers, petroleum science and engineering, and various flow devices in chemical processing industries. The objective is to prove or understand the essence of parameters like heat transfer coefficient, mass transfer coefficient, etc., depending on such flow regimes. One such piece of equipment found in industry is a heat exchanger, where heat transfer occurs from one medium to another.\u0000\u0000\u0000\u0000The present study majorly discusses increasing the heat transfer coefficient in the case of shell and tube heat exchangers with rotation of tubes and is restricted to a single tube inside a shell.\u0000\u0000\u0000\u0000The methodology section can be broadly divided into two categories. First, the theoretical solution (obtained under certain assumptions) of the flow between two concentric cylinders, which includes both the rotation case and no rotation case. And second, ANSYS Fluent simulations have been presented at a steady state for both cases. All required conditions, dimensions of the chosen geometry, and assumptions have been clearly mentioned before getting into the discussion or along the way. Moreover, this study is a kind of comparative study between the conventional method of operating and rotation of tubes inside the shell and tube heat exchangers.\u0000\u0000\u0000\u0000The results were positive from both the ways – theoretical and ANSYS, that there was a certain increase in the heat transfer coefficient. The overall heat transfer coefficient increased at varying flow rates (0.25kg/s, 0.5kg/s, and 1kg/s) at different speeds of rotation (100 RPM, 200 RPM, and 300 RPM).\u0000\u0000\u0000\u0000One of the most common equipment in industries is heat exchanger. Parameters like heat transfer coefficient can be increased by rotating tube(s) of heat exchanger. This was presented using two approaches- analytical and simulation techniques. On varying RPM from 0 to 300, heat transfer coefficient increased by 69.1% for 1 kg/s, 124.7% for 0.5 kg/s, and 172.3% for 0.25 kg/s.\u0000","PeriodicalId":38021,"journal":{"name":"Recent Innovations in Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49448019","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}

{"title":"Development and Experimental Investigation of Composite Structure Heat Pipe","authors":"H. Parikh, Rivaan Jadav, Aashay Mehta, Soham Bhatt","doi":"10.2174/2405520416666230102111729","DOIUrl":"https://doi.org/10.2174/2405520416666230102111729","url":null,"abstract":"\u0000\u0000This study aimed at developing a composite structure heat pipe.\u0000\u0000\u0000\u0000Conventionally, the heat pipe enclosure is made out of a single continuous conductive material corresponding to minor heat losses to the surrounding through the middle section, which ideally needs to be adiabatic in nature. The insulating nature of the carbon fiber reduces the axial heat losses and improves the latent heat of vaporization.\u0000\u0000\u0000\u0000The objective of this study is to develop a carbon fiber-reinforced composite heat pipe and a test rig to check the performance of the heat pipe.\u0000\u0000\u0000\u0000The hand lay-up technique is used to develop a composite structure heat pipe with a carbon fiber adiabatic section. A test rig is developed to check the performance of the heat pipe. Moreover, the weight comparison is made for a conventional and composite structure heat pipe.\u0000\u0000\u0000\u0000The test results reveal that the composite structure heat pipe gives weight reduction in the range of 25 to 30 percent than the conventional heat pipe for identical dimensions and also shows a faster heat absorption rate.\u0000\u0000\u0000\u0000Conventional heat pipe may be replaced with the lightweight composite structure heat pipe.\u0000","PeriodicalId":38021,"journal":{"name":"Recent Innovations in Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45280237","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}

{"title":"Statistical optimization of carbon dioxide capture performance by tri-solvent system of MEA-DEA-PZ from the stored gas reservoir","authors":"Akash Sood, Avinash Thakur, Sandeep Mohan Ahuja","doi":"10.2174/2405520416666221226154953","DOIUrl":"https://doi.org/10.2174/2405520416666221226154953","url":null,"abstract":"\u0000\u0000Optimize the process parameters for low concentration blended tri-solvent\u0000\u0000\u0000\u0000This experimental work has studied the effect of various operating factors (such as MEA/DEA/PZ concentration, temperature, operating pressure, agitation speed, and time) on absorption capacity from stored gas reservoir. As the current approach has a significant application to the bio-gas reservoirs to enhance the purity of CH4 and elimination of CO2 from the gas. The RSM has been used to model and optimize the CO2 capture process relating to low-pressure operating conditions.\u0000\u0000\u0000\u0000Maximize rapid CO2 absorption\u0000\u0000\u0000\u0000The CO2 absorption was performed for the total solvent (5, 10, and 15 %v/v) under the temperature range of (20, 25, and 30 °C) having reservoir pressure (1.5, 2, and 2.5 bar). The fraction of DEA: MEA was restricted to (0.2, 0.5, and 0.8) with simultaneous loading of anhydrous PZ range from 0 to 2 gms; and agitation speed for step intervals of (300, 600, and 900 rpm).\u0000\u0000\u0000\u0000The relative error was found to be within ±1.93% and ± 2.25% for the initial absorption rate and CO2 absorption (at t=15 min.) respectively. According to this evidence, the process statistical model suits to be appropriate and accomplishes the goal of optimization.\u0000\u0000\u0000\u0000The findings of the analysis of variance (ANOVA) illustrates good agreement between the experimental and statistical model confirming the potential of blended tri-solvent by aggressive initial rate of absorption and rapid CO2 absorption of 3.415 gm. CO2/min. & 17.779 gm. CO2 respectively.\u0000\u0000\u0000\u0000RSM has successfully optimised the CO2 absorption by blended tri-solvent (MEA/DEA/PZ) for stored gas reservoir. For the initial absorption rate and CO2 absorption (at t=15 min.), the experimental design, quadratic models, and regression analysis developed for these variables were found to be reasonably accurate and efficient in forecasting response values in a range of the variables, with a relative error of ±1.93% and ± 2.25%, respectively. The potential of blended tri-solvent to attain a very high degree of absorption in a relatively short amount of time was proved by the optimum value of initial absorption rate, which was calculated to be 3.415 gm. CO2/min. and rapid CO2 absorption, which was calculated to be 17.779 gm. CO2. The 3D surface plots have shed light on the interactive effects that the process parameters have on the CO2 absorption while the synergistic effects of MEA/DEA/PZ have been taken into consideration.\u0000","PeriodicalId":38021,"journal":{"name":"Recent Innovations in Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44502630","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}

{"title":"Effect of Amorphousness Degrees and Intermolecular Interactions between Lithium Perchlorate (LiClO4) and Polylactic Acid (PLA) on the Conductivity PLA-Based Polymer Electrolyte Performance","authors":"Ab Malik Marwan Ali, F. A. Lothfy, Siti Zafirah Zainal Abidin, Hartini Ahmad Rafaie","doi":"10.2174/2405520416666221226100739","DOIUrl":"https://doi.org/10.2174/2405520416666221226100739","url":null,"abstract":"\u0000\u0000The polymer electrolyte membrane serves as a separator and electrolyte in an energy storage device. The purpose of this study was to investigate the structural properties of polymer electrolyte membranes prepared of lithium perchlorate (LiClO4)-complexed polylactic acid (PLA).\u0000\u0000\u0000\u0000The structural properties of the host polymer electrolyte have significant impact on the conductivity value.\u0000\u0000\u0000\u0000In this paper, the effect of amorphousness and intermolecular interactions degrees between LiClO4 and PLA on conductivity performance was studied.\u0000\u0000\u0000\u0000The polymer electrolyte film of LiClO4-complexed PLA was prepared with various weight percentages of LiClO4 salt (10%, 20%, 30%, 40%, 50%, and 60%) in PLA by using solution casting technique.\u0000\u0000\u0000\u0000PLA with 50% LiClO4 had the highest degree of amorphousness and the highest percentage of interacting carbonyl groups, which resulted in the highest conductivity of 2.56 x 10-5 S cm-1.\u0000\u0000\u0000\u0000As conclusion, the optimum composition of LiClO4 for the amorphousness, interacting of carbonyl group and conductivity obtained, and it can be used to use for further research to improve the conductivity value as purpose to apply it into energy storage devices development.\u0000\u0000\u0000\u0000-\u0000","PeriodicalId":38021,"journal":{"name":"Recent Innovations in Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42362559","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}

{"title":"Is it possible to draw conclusions (adsorption is chemisorption) based on fitting between kinetic models (pseudo-second-order or Elovich) and experimental data of time-dependent adsorption in solid–liquid phases?","authors":"Hai Nguyen Tran","doi":"10.2174/2405520416666221202085740","DOIUrl":"https://doi.org/10.2174/2405520416666221202085740","url":null,"abstract":"<jats:sec>\u0000<jats:title />\u0000<jats:p />\u0000</jats:sec>","PeriodicalId":38021,"journal":{"name":"Recent Innovations in Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46828414","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}

{"title":"Catalysts from non-critical raw material","authors":"Lucia D’ Accolti","doi":"10.2174/2405520415666221012162957","DOIUrl":"https://doi.org/10.2174/2405520415666221012162957","url":null,"abstract":"<jats:sec>\u0000<jats:title />\u0000<jats:p />\u0000</jats:sec>","PeriodicalId":38021,"journal":{"name":"Recent Innovations in Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44304261","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}