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Article
Purification of Zinc Oxide Using Direct Thermal Process by PetroleumCoke

Authors: Thaer Adnan Abdulla ثائر عدنان --- Zuhair A-A. Khammas --- Salam K. Al-Dawery
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2009 Volume: 10 Issue: 1 Pages: 35-41
Publisher: Baghdad University جامعة بغداد

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Abstract

The present investigation is concerned for the purification of impure zinc oxide (80-85 wt %) by using petroleum coke(carbon content is 76 wt %) as reducing agent for the impure zinc oxide to provide pure zinc vapor, which will beoxidized later by air to the pure zinc oxide.The operating conditions of the reaction were studied in detail which are, reaction time within the range (10 to 30 min),reaction temperature (900 to 1100 oC), air flow rate (0.2 to 1 l/min) and weight percentage of the reducing agent(petroleum coke) in the feed (14 to 30 wt %).The best operating conditions were (30 min) for the reaction time, (1100 oC) for the reaction temperature, (1 l/min) forthe air flow rate, and (30 wt %) of reducing material (petroleum coke) in the feed.Under the above conditions, conversion of zinc oxide was (68.12 %) and the purity of the produced zinc oxide was(97.85 %) by using petroleum coke as reducing material.

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Article
Nonlinear Adaptive Control of a pH Process

Authors: Duraid Fadhel Ahmed --- Hameed Ali Omran Al-Anbari --- Salam K. Al-Dawery
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2009 Volume: 10 Issue: 1 Pages: 9-16
Publisher: Baghdad University جامعة بغداد

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Abstract

In this paper a nonlinear adaptive control method is presented for a pH process, which is difficult to control due to the nonlinear and uncertainties. A theoretical and experimental investigation was conducted of the dynamic behavior of neutralization process in a continuous stirred tank reactor (CSTR). The process control was implemented using different control strategies, velocity form of PI control and nonlinear adaptive control. Through simulation studies it has been shown that the estimated parameters are in good agreement with the actual values and that the proposed adaptive controller has excellent tracking and regulation performance.

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