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Articles by M.I. Abdul Mutalib
Total Records ( 4 ) for M.I. Abdul Mutalib
  Amir Shafeeq , M.I. Abdul Mutalib , K.A. Amminudin and Ayyaz Muhammad
  Scheduling optimisation normally aimed at minimizing makespan, leading to overall optimisation of the production cost. This study focuses on determining the production sequence with minimum makespan for scheduling of a flowshop process using no intermediate storage (NIS) transfer policy. Unlike previous methods which uses mathematics considerably and lacks interactivity, the method introduces a simple approach based on matrix formulation to determine the makespan for all possible batch production sequences thus allowing simple screening to be done for selecting the optimal sequence.
  Amir Shafeeq , M.I. Abdul Mutalib , K.A. Amminudin and Ayyaz Muhammad
  The present research proposes a novel approach based on matrix to determine the makespan of a batch process adopting zero wait transfer policy. The proposed approach uses simple mathematical formulae, applied on a matrix representing the batch process recipes according to a selected production sequence. Rearrangement of the matrix rows according to the varied production sequences possible for the specified batch process recipes enables the makespan to be determined for each sequence. Designer is then provided with the production sequence options with its corresponding makespan from which a selection could be made according to the process conditions.
  A. Inayat , M.M. Ahmad , M.I. Abdul Mutalib and S. Yusup
  Hydrogen is considered as an attractive clean fuel for the future. Hydrogen production via biomass steam gasification is receiving attention due to its sustainability and zero net carbon emission. Coupled with in situ CO2 adsorption, this process has been proven to be environment friendly. The study reports on the impact of temperature, steam/biomass ratio and sorbent/biomass ratio on hydrogen production performance in a steam gasification process using a simulation model developed in MATLAB. In this study, biomass is assumed as char and gasification and CO2 adsorption occur in one gasifier. The model is used to predict the product gas composition, hydrogen yield and thermodynamic efficiency of the process. The results show that with the increase in temperature and steam/biomass ratio, the hydrogen concentration and yield increase, however, the thermodynamic efficiency decreases. Hydrogen yield increases from 78 to 97 g kg-1 of biomass with the increase in temperature and steam/biomass ratio within the range of 800 to 1300 K and 2.0 to 5.0, respectively. Maximum hydrogen efficiency of 87% is observed at 800 K and steam/biomass ratio of 2.0. At the sorbent/biomass of 1.52, hydrogen purity is predicted to reach 0.98 mole fraction with CO2 present in system absorbed. At 950 K with steam/biomass ratio of 3.0 and sorbent/biomass ratio of 1.0, a maximum hydrogen concentration of 0.81 mole fraction is obtained in the product gas. The steam feed rate is found to have the most impact on the hydrogen production and thermodynamic efficiency among the process parameters.
  A. Muhammad , M.I. Abdul Mutalib , T. Murugesan , Z. Man and A. Bustam
  The growing interest in exploring the physical properties of ionic liquids (ILs) could be attributed towards the design of industrial processes based on ILs (nonvolatile) to replace organic solvents (highly volatile). The densities and viscosities of imidazolium based ILs have been measured and reported by a number of researchers at ambient pressure. However, the experimental physical property data for most of the ILs at high pressure is quite scarce due to the difficulties involved in the treatment of natural gas to remove carbon dioxide (CO2) at high pressures. Therefore, there is an immense need to apply correlations and thermodynamic Equation Of State (EOS) models to predict or estimate physical properties. The main objective of this work is to investigate the application of ‘Gardas and Coutinho method’ and ‘Modified Tait equation’ to estimate the densities and viscosities of two ILs: 1-hexyl-3-methyl imidazolium tetrafluoroborate; (C6mim) (BF4) and 1-hexyl-3-methyl imidazolium hexafluorophosphate; (C6mim) (PF6) at pressures up to 100 bar and at temperatures (298.15, 308.15, 318.15) K. The results show that these methods could be applied satisfactorily for estimating the density and viscosity of ionic liquids. The densities and viscosities of both ILs increased with the increase in pressure at all the studied temperatures. However, the effect of anion appeared to be significant on both physical properties for the studied ILs and found to be in decreasing order of (PF6) >(BF4).
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