Optimizing Preparation of Modified Calcium Oxide to Capture CO2 by Carbonation

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Azrul Bin Alias

Progress report submitted in partial fulfillment of
the requirements for the
Bachelor of Engineering (Hons)
(Chemical Engineering)

JULY 2009

Universiti Teknologi PETRONAS
Bandar Seri Iskandar
31750 Tronoh
Perak Darul Ridzuan


The objective of this project is to optimize the preparation of modified Calcium Oxide (CaO) to capture CO2 by carbonation through hydration of ethanol/water. The carbonation reaction is the basis for CO2 capture systems. However CaO as regenerable CO2 sorbents in industrial processes is limited by the rapid decay of the carbonation conversion with the number of cycle carbonation/ calcination. Therefore Calcium based sorbents have attracted renewed attention as possible sorbents for cyclic calcination/carbonation processes due to their potential for regeneration and effective technique for capturing CO2 from combustion processes. The carbonation conversion for CaO modified with ethanol/water solution is greater than for CaO hydrated with distilled water and is much higher than that for calcined limestone. (Li et all). This work covers and presents a multi experimental test of preparing the modified CaO through hydration of water/ethanol by manipulate various parameter combination. The experiments were conducted using a modified furnace to permit the flow of CO2 for carbonation process and calcium oxide. Then, the carbonation conversion is calculated which signify the effectiveness of CO2 capture and the optimum parameter to produce the highest carbonation conversion is identified based on approach of Taguchi Method , the signal-to-noise (S/N) ratio and the analysis of variance (ANOVA). Through this study the optimal parameter to prepare modified CaO through ethanol/water hydration can be obtained.



1.1Background of Study
1.2Problem Statement
1.3Objectives & Scope of Study

2.1Carbonation/calcinations process
2.4 Particle Size
2.5Carbonation Duration
3.1 Research methodology
3.2Project Activities
3.2.1 Preparation of modified CaO through ethanol/water hydration 3.2.2 Carbonation of modified CaO.
3.3.1 Apparatus
3.3.2 Chemical Reagent
3.4 Project Flow Chart (Gantt Chart)
4.1 Analysis of the S/N ratio
4.2 Analysis of variance (ANOVA)
4.3 Confirmation experiment

1. Project Background
It is now generally accepted that CO2 is one of the major greenhouse gases that is directly influencing the global climate changes .The efficient CO2 capture technologies are desired to significantly reduce CO2 emissions from large stationary source fossil fuel-fired power stations. Therefore, the production of energy and fuel from biomass is receiving considerable interest particularly due to concerns regarding energy security and the need to reduce greenhouse gas emission. A highly promising way to exploit biomass resource involves converting biomass to hydrogen rich gas which could be utilized as a replacement energy carrier for fossil fuels in the transport, industrial, commercial and residential sectors. In order to maximize the output of hydrogen, the gasification can be coupled with in situ CO2 capture using CaO. CaO-based sorbents, in particular lime (CaO) produced from limestone, have been intensively investigated as sorbents for CO2 capture during the last several years and found that the modified CaO which is carbonation conversion for CaO modified with ethanol/water solution is greater than for CaO hydrated with distilled water and is much higher than that for calcined limestone and it is proved as a new and...
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