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Systematic Design Procedures for Natural Gas Desulphurization

Nawaree, Suvanmani (2009) Systematic Design Procedures for Natural Gas Desulphurization. Universiti Teknologi PETRONAS. (Unpublished)

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Abstract

Natural gas is a mixture of variable hydrocarbons and many contain other contaminants such as nitrogen, carbon dioxide and sulfur. The undesirable compound such as hydrogen sulfide must be removed to prevent corrosion and environmental problems. Sulfur compound also poisons the catalysts and consequently disrupts reactor performance. Reactor systems that have been poisoned by sulphur sees lower the conversion, lower selectivity and higher temperature requirement for a particular lower conversion. While sulfur removal from natural gas stream is necessary, there is insufficient framework to systematically design the removal system. The objective of this project is therefore to develop a framework for the systematic design of H2S adsorber. The desired design framework will be able to predict the breakthrough curve of the chemisorption reaction and determine the size of the adsorption column. The project will also study the interactions between parameters that affect the system's design. The desulphurization system selected in this project uses zinc oxide adsorbent. Additionally HiS is chosen as the adsorbate in the natural gas stream. Desulphurization of natural gas is a two step process; firstly the natural gas containing organic sulfur is catalytically hydrogenated to H2S. Then the natural gas stream containing H2S is send to a chemisorption column. Zinc oxide adsorbent is converted to zinc sulfide upon contact with H2S. The shrinking core model is selected to describe the solid gas reaction on the surface of the adsorbent. The model considers chemical reaction coupled with diffusion as the rate limiting step. Solutions of the shrinking core model enable the prediction of breakthrough curve. The shrinking core model was found to give a good description of the sulfur removal process whereby it has been found that the conversion of single solid sorbent increases continuously with time until it completely converted in 8.32min. A single zinc oxide pellet able to adsorb 1.66E-03 moles ofH2Sper hour before it reaches its breakthrough limit. Further on, sizing is done to calculate the amount ofadsorbent needed for a column. The results obtained are 34,747 kg ZnO needed for an adsorption column with a service lifetime of 6 months and the dimensions of column from calculation deviates less than 5% then the actual industrial equipment. Therefore, the systematic design procedures outlined are applicable for industrial use. iii

Item Type: Final Year Project
Academic Subject : Academic Department - Chemical Engineering - Process System Engineering
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 22 Oct 2013 11:22
Last Modified: 22 Oct 2013 11:22
URI: http://utpedia.utp.edu.my/id/eprint/9246

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