vol. 4 no. 1 (2004)

EDITOR'S NOTES

THIS VOLUME MARKS a dramatic improvement in the quantity and variety of featured articles. In this issue, we have lined up the eleven (11) researches conducted by scientists not only from the ASEAN region, but also from as far as the United Kingdom and South Africa. Malaysia leads our list of Asian scientists in terms of output with four research papers, followed by the Philippines with three papers, and then Japan and Indonesia with two papers each.

These diverse research outputs cover a wide range of topics that can be grouped according to their goals: (a) those that innovate to come up with better and more efficient alternatives to old, albeit time-tested formulas and processes; (b) those that invent to come up with practical solutions to pressing environmental and industrial concerns; and (c) those that evaluate the current state of technologies and procedures to continually upgrade present systems.

Devising More Efficient Alternatives and Methods Goto, Hori, Abella, and Gaspillo show that periodic operation of reactive distillation is a lot better than steady state operation in dehydrogenating 2-propanol. Choong, Paterson, and Scott illustratehow to compute for local superficialgas velocityfrom the Ergun equation using a hassle-freeway that avoids both potential errors and discontinuitiesin calculating, especiallywhen the equation reduces to Darcy's law. Fadzlina, Teng, and Rahman sample how the isopycnotic mixing rule may be used to predict the densities of ternary aqueous systems of NaPAA, multicomponent systems that involve polyelectrolytes, with a remarkable percentage error of less than 0.1 %.

Tan and Culaba use the GREET 1.Sa fuel cycle inventory to come up with the best practical environmentaloption for natural gas utilization-namely: (a) compressedNG, based on 1 MJ of fuel energy deliveredto the refuelingsite; and (b)electricity, based on 1km traveled by an end-uservehicle, as vehiclefuel. Handogo, Wlbawa, Rusmana, and Hidayat prove that relative gain array as a measure of interaction for multivariable processes, specifically for a multi-input multi-output 2x2 system, provides good control pairing only for cases where t 3 1; otherwise, dynamic interaction measurements, such as the average dynamic gain array or the inverse Nyquist array, become applicable.

Addressing Environmental and Social Concerns Setiadi, Sondjaja, and Veriansyah explore the potentials of how synthetic wastewater can be maximized using sequencing batch reactors to produce biodegradable plastic. Hossain, Mohd-Jaafar, and Ani explain how promoted selective non-catalytic reduction of the pollutant NO x can be a less testy alternative to the costly and cumbersome SNCR with the simple addition of commercial grade NCizC03, Pattaraprakorn, Tono, and Nliyama devise a simple and inexpensive area measurement module for small-scale water treatment, for example, in local rural health centers, using readily available materials such as dry ice.

Auresenla and Taleon uncover the potentials of an acclimatizedthree-phased fluidizedbed aerobic biofilm reactor in degrading PCBs, a useful but carcinogenic and highly nature-resistant syntheticchemicalthat has been banned since the 70s. Maarof, Hameed, and Ahmad describe how two commercial-typeNorit activated carbons effectivelyremove from 85 to 96% of trace-levelphenols in aqueous solutions and, consequently,of potential aid for wastewater treatment. Process Reenglneerlng and Quality Management Fraser reviews process synthesis techniques, especially the advent and advantages of pinch technology and the powerful potential of the impact diagram as system and tool, respectively, to screen design options; optimize raw materials, utilities, and capital; reduce pollution; and sustain maximum process efficiency.

ALTHOUGH WE HAVE categorized our featured papers into three types, the concerns our papers here address often overlap. This only goes to show the significant and multifaceted role that Chemical Engineering plays in providing modern society with cost-efficient and practical alternatives and methodologies while continually addressing the callto be more socially and environmentally responsible.

Thus, we have articles that address not only theoretical or mathematical-level problems such as those hurdled by Choong et al., Fadzlina et al., and Handogo et al. but also process- or management- level challenges such as that tackled by Fraser. What is most important, however, is that our researches give hard, practical answers to very urgent globally experienced phenomena that include wastewater treatment, air pollution, disposal of nonbiodegradable waste materials, and limited access by rural folks to helpful technology. Let us be part of the solution and not the problem.

Table of Contents

Articles

Periodic Operation of Reactive Distillation of Dehydrogenation of 2-Propanol Abstract Full Text
Shigeo Goto, Kenta Hori, Leonila C. Abella, Pag-asa D. Gaspillo 1-7
A Neat Way to Calculate the Gas Velocity from the Ergun Equation in a Packed Bed Abstract Full Text
Thomass Y. Choong, William R. Paterson, David M. Scott 8-10
Production of Polyhvdroxyalkanoates from Synthetic Wastewater Using Sequencing Batch Reactors in On-Off Sequences Abstract Full Text
Tjandra Setiadi, Herriyanto Ronny Sondjaja, Bambang Veriansyah 11-18
Promoted Selective Non-Catalytic Reduction: Prospective Technology for Nitrogen Oxide Reduction Abstract Full Text
Khandoker Abu' Hossain, Mohammad Nazri Mohd-Jaafar, Farid Nasir Ani 19-24
A Proposed Surface Area Measurement Module for Rural Folks: Desing Concept and trial Setup Abstract Full Text
Woraratana Pattarapaprakorn, Makoto Tono, Hiro Niyama 25-32
Net Energy and Carbon Flow Analyses on four pathways for the utilization of Natural Gas as Automotive Fuel Abstract Full Text
Raymond Girard R. Tan, alvin B. Culaba 33-38
Steady State and Dynamic Interaction Analysis in Multivarible Control System Abstract Full Text
Renanto Handogo, Gede Wibawa, Totong Rusmana, Moch. Arief Hidayat 39-46
Biodegradation of Polychlorinated Biphenyls Using Acclimadzed Biofilmina Three-Phase Fluidized Bed Aerobic Reactor Abstract Full Text
Joseph Auresenia, Donna Marie G. Taleon 47-54
Process Synthesis: Design for Improved Effectiveness Abstract Full Text
Duncan M. Fraser 55-63
Measurement and Prediction of Densities of Ternary Aqueous Mixtures Involving Sodium Polyacrylate Abstract Full Text
Z. A. Noor Fadzlina, T. T. Teng, M. Abdul Rahman 64-69
Adsorption Isotherms for Phenol Onto Activated Carbon Abstract Full Text
Hawaiah Imam Maarof, Bassim H. Hameed, Abdul Latif Ahmad 70-76