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Constrained model predictive control with economic optimization for integrating process

14-May-2015 | Qiang Pang, Tao Zou, Qiumei Cong, Yuan Wang, The Canadian Journal of Chemical Engineering, 2015

Abstract The close relationship between steady‐state prediction outputs and actual inputs results in the existence of model uncertainty in the steady‐state prediction equation for integrating processes. This paper establishes a steady‐state prediction model that can reflect the dynamic ...

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Basic design methodology for a prilling tower

14-May-2015 | Saad N. Saleh, Shakir M. Ahmed, Dawood Al‐mosuli, Shahzad Barghi, The Canadian Journal of Chemical Engineering, 2015

Abstract A design methodology was developed for prilling towers based on simultaneous heat, mass, and momentum balances. Basic principles of the prilling process and related sub‐models were considered for production of relatively mono‐size prills. The method was employed in design of a ...

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Growth and Dissolution Kinetics of A and B Polymorphs of L‐Histidine

29-Apr-2015 | Lek Wantha, Adrian E. Flood, Chemical Engineering & Technology, 2015

Abstract The growth rate of the stable polymorph A and the dissolution rate of the unstable polymorph B of L‐histidine (L‐his) in aqueous solution were experimentally determined at varying temperatures. The growth and dissolution kinetics were measured by means of desupersaturation and ...

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Co‐liquefaction of lignite and biomass over Ni7w3 and Ni3w7 catalysts

28-Apr-2015 | Songdong Yao, Yongming Du, Feng Huang, ShaoJun Wang, Mengmeng Wang, The Canadian Journal of Chemical Engineering, 2015

ABSTRACT Co‐liquefaction of lignite and biomass were carried out in an autoclave by varying the biomass type and initial hydrogen pressure as well as the catalyst. The properties of the catalysts, raw materials, and residues were characterized by Ultimate analyses, BET, H2‐TPR, TG/DTG and ...

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Growth Rate Dispersion at the Single‐Crystal Level

27-Apr-2015 | Emilie Bobo, Samuel Petit, Gérard Coquerel, Chemical Engineering & Technology, 2015

Abstract Evidence of growth rate dispersion for symmetry‐related opposite faces of centrosymmetric single crystals of ammonium perchlorate is provided. Crystallization experiments conducted by evaporation of a stagnant aqueous solution at room temperature show that some faces have high and ...

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Isomer Treatment by Additive Application in the Liquid Stage as Known from Industrial Crystallization

24-Apr-2015 | Franziska Kreißig, Christian Schäfer, Elodie Verdurand, Joachim Ulrich, Chemical Engineering & Technology, 2015

Abstract This study verified the usefulness of additives for the stabilization of dissolved material in the liquid stage as in the case of crystallization. Additives were introduced to prevent dissolved crystals from isomerization and degradation. The case study here is astaxanthin, a ...

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Modeling and experimental study of membrane wetting in microporous hollow fiber membrane contactors

17-Apr-2015 | Liyun Cui, Zhongwei Ding, Liying Liu, Yunpeng Li, The Canadian Journal of Chemical Engineering, 2015

A kinetic model has been developed to predict the distribution of wetness along a hollow fiber and the average wetness as a function of time in hollow fiber membrane (HFM) contactors. The membrane absorption experiments were conducted using the diethanolamine (DEA) solution as absorbent to ...

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Free‐radical polymerization of urea, acrylic acid, and glycerol in aqueous solutions

15-Apr-2015 | Bruno S. Fernandes, José Carlos Pinto, Elaine C.M. Cabral‐Albuquerque, Rosana L. Fialho, Polymer Engineering and Science, 2015

The main objective of the present study is to produce copolymers of urea, acrylic acid, and glycerol through aqueous solution free‐radical polymerizations and analyze the structural, thermal, rheological, and release properties of the obtained materials. To do this, aqueous solution ...

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Removal of heavy metal ions from aqueous solutions by radiation‐induced chitosan/(acrylamidoglycolic acid‐co‐acrylic acid) magnetic nanopolymer

15-Apr-2015 | F.I. Abou El‐Fadl, H.L. Abd El‐Mohdy, Polymer Engineering and Science, 2015

An effective method was developed to isolate toxic heavy metal ions from the aqueous solution by the magnetic nanopolymers. The magnetic sorbent was prepared with radiation‐induced crosslinking polymerization of chitosan (CS), 2‐acrylamido‐glycolic acid (AMGA), and acrylic acid (AAc), which ...

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Effect of co‐solvents on the photovoltaic performance of an inverted organic solar cell

07-Apr-2015 | Sarita S. Nair, D. Kumar, Amitava Majumdar, Polymer Engineering and Science, 2015

We investigated the effect of varying polymer crystallinity, morphology, and optical property, produced by adding four different co‐solvents in to the poly(3‐hexylthiophene) (P3HT): [6,6]‐phenyl C61‐butyric acid methyl ester (PCBM) active layer blend solution, on the functioning of an inverted ...

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