Chemical Engineering Research Bulletin <p>Publishes research work conducted in the field of Chemical Engineering and related fields. Full text articles available.</p><p>Note: On 21/11/2011 CERB was accepted onto Scopus.</p> Chemical Engineering Department, Bangladesh University of Engineering and Technology Dhaka en-US Chemical Engineering Research Bulletin 0379-7678 Determination of Optimum Drying Temperature Profile by Iterative Learning Control (ILC) Method to Obtain a Desired Moisture Content in Tablets <p>The paper presents an industrial case study example to evaluate the performance of the linear time varying (LTV) perturbation model based iterative learning control (ILC) in a pilot scale batch system. The operating data based strategy applied here is based on utilizing the repetitive nature of batch processes to update the operating trajectories using process knowledge obtained from previous runs and thereby providing a convergent batch-to-batch improvement of the process performance indicator. The method was applied to determine the required drying temperature of Paracetamol granules to obtain desired moisture content at the end of the batch. After granulation operations, Paracetamol granules were dried in a fluid bed dryer in the pilot plant laboratory of GlaxoSmithKline Bangladesh Limited, Chittagong, Bangladesh. These results demonstrate the potential of the ILC approach for controlling batch processes without rigorous process models.</p><p>Chemical Engineering Research Bulletin 20(2018) 1-7</p> Nahid Sanzida ##submission.copyrightStatement## 2018-06-06 2018-06-06 20 1 1 7 10.3329/cerb.v20i1.36923 Modelling and Simulation of a Fluidized Bed Reactor for Minimum Ammonium Nitrate and Reduction of NOx Emissions <p>Due to the environmental legislations related to the nitrates and their emissions, thermal decomposition of ammonium nitrate (AN) in a fluidized reactor (FR) is regarded one of the most reasonable chemical-free disposal process for an aqueous waste nitrate stream. Therefore, the present study is aimed to improve a mathematical model based on experiments (from the literature) for enhancing the design of such reactor in an environmentally friendly manner. Where, the optimal kinetic parameters of the relevant reactions are firstly obtained employing the optimization technique keeping in mind the goal to construct the model with high exactness. Such design factors are then utilized for the purpose of getting the optimal operating conditions of fluidized bed reactor (FBR) achieving the main target of this process with ammonium nitrate-free content (Nil) at the end of the reactor in addition to reducing the NO<em><sub>x</sub></em><em> </em>emissions. The model is based on the two-phase theory of a FBR with predicting the concentration behavior along the reaction zone length for all components in the emulsion and bubble phases in addition to the temperature profile of the gas phase. New results related to output conversion of ammonium nitrate as well as NO content at the optimal operating conditions has been obtained in comparison with those reported in the literature.</p><p>Chemical Engineering Research Bulletin 20(2018) 8-18</p> Aysar Talib Jarullah ##submission.copyrightStatement## 2018-06-06 2018-06-06 20 1 8 18 10.3329/cerb.v20i1.36925 Derivation of Nanocellulose from Native Rice Husk <p>Nanocellulose has been in numerous applications and can be obtained from bioresources. This work demonstrates the derivation of nanocellulose from an alternative option i.e. rice husk. The processed rice husk was refined by chemical and mechanical treatments. Nanocellulose was subsequently derived from the refined rice husk through acid hydrolysis followed by centrifugation, dialysis and ultrasonic treatment. Scanning Electron Microscopy ensured the nanoscale diameter while Fourier Transformed InfraRed Spectroscopy confirmed the removal of noncellulosic materials. It is therefore proposed that the native rice husk can also be utilized for manufacturing nanocellulose reducing its adverse environmental impacts.</p><p>Chemical Engineering Research Bulletin 20(2018) 19-22</p> Md Iqbal Hossain Humayra Zaman Taslima Rahman ##submission.copyrightStatement## 2018-06-06 2018-06-06 20 1 19 22 10.3329/cerb.v20i1.36926 Influence of amino acid additives on solution behaviour of L-alanine <p>The solubility experiment of L-alanine solution was performed in a 250ml jacketed glass crystallizer without and with amino acid additives at temperature from 15<sup>o</sup>C to 75<sup>o</sup>C by means of gravimetric method. On the whole, L-leucine additive significantly altered the solubility of L-alanine and Glycine additive caused an erratic pattern on the solubility data of L-alanine. The hydrophobic methyl side chain of L-leucine additives is believed to contribute to the formation of water clathrate in the solution which affected the interaction of L-alanine molecules in water solvent and thus modified the solubility of L-alanine. Finally, thermodynamic data analysis of L-alanine solution was extensively assessed. The negative deviation of L-alanine from the ideal solution is as a result of high solute-solvent interaction, which is due to the hydrophobicity and clathrate phenomenon of the water molecules in the solution.</p><p>Chemical Engineering Research Bulletin 20(2018) 23-29</p> Muhamad Fitri Othman Nornizar Anuar Noor Fitrah Abu Bakar Norazah Abdul Rahman ##submission.copyrightStatement## 2018-06-06 2018-06-06 20 1 23 29 10.3329/cerb.v20i1.36927 Thermodynamic properties of the dodecylbenzenesulfonic acid-acetone binary liquid mixture using a modified flory theory <p>Prigogine–Flory–Patterson (P-F-P) theory was applied for the correlation the experimental data of excess molar volume for the binary liquid mixture of DBSA-Acetone at the temperature range of (293.15-303.15 K). The three contribution terms (pressure, interaction and free volume) in the P-F-P equation were compared with the total effect of P-F-P equation. A positive excess molar volume were obtained at all the range of mole fraction and at all the temperatures. The maximum value of excess molar volume was positioned at the 0.4 mole fraction. Eyring-Flory-Huggins theory was found useful in the estimation of the viscosity deviation variation with mole fraction at the same temperature range. A negative deviation was found in the viscosity for all the range of temperature and mole fraction. The maximum deviation in the viscosity was found at the mole fraction of 0.4. The increase in the negative deviation values with temperature was interpreted as a result of the decrease in the attractive forces between the like molecules.</p><p>Chemical Engineering Research Bulletin 20(2018) 30-35</p> Ali A Jazie ##submission.copyrightStatement## 2018-06-06 2018-06-06 20 1 30 35 10.3329/cerb.v20i1.36928