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GT - DOS
- 1. GTC Technology LicensingPartnerships at Work Reducing the Cost of H2 S Removal and Sulfur Recovery GT-DOS TM Engineered to Innovate®
- 2. GT-DOSTM GTCTechnologyLicensingPartnerships Engineered to Innovate GT-DOS:Reducing the cost of H2 S Removal and Sulfur Recovery by Direct Oxidation to Sulfur H2 S removal and sulfur recovery from streams with “medium” amounts of sulfur have historically been challenges for the industry. At sulfur recovery rates of less than 0.1 ton/day, solid and liquid scavengers and sorbents are cost-effective and preferred by the industry. At sulfur recovery rates of over 100 ton/day, “modified Claus” processes are generally favored. In the intermediate range, direct treatment with aqueous iron liquid redox or bacteria based “bio-desulfurization” processes may be used. However, these processes have challenges at higher operating pressures and in the presence of heavy hydrocarbons, in addition to operations and maintenance issues relating to solid precipitation. These processes also have high operating cost and the sulfur that is produced generally has no value and incurs the cost of disposal. GT-DOS is a patented technology developed by TDA Research and licensed worldwide by GTC Technology. GT-DOS offers simplicity of operation, and is specifically applicable to lean acid gas streams, cost effectively recovering sulfur in the 0.1 to 200 ton/day range. Process Overview The GT-DOS technology converts H2 S catalytically directly into sulfur, from lean (low concentration) H2 S streams. The sulfur conversion efficiency is around 90% in a single pass, and is based on the reaction listed below: H2 S + ½ O2 → S + H2 O An advanced metal oxide catalyst enables sulfur conversion at low or high pressures, and has been demonstrated to be robust in the presence of heavy hydrocarbons. The catalyst has been proven to be resistant to high concentrations of hydrocarbons, including aromatics and olefins. The H2 S containing feed stream is mixed with air, heated to the reaction temperature of around 400°F (200°C) and fed to the GT-DOS reactor. The reacted stream containing sulfur vapor is then condensed to recover the sulfur. The gas stream can be further desulfurized with sorbents or tail gas treatment. The sulfur is recovered as molten sulfur with properties similar to traditional Claus sulfur. It can be converted to solid sulfur for ease of handling. Heat integration between the feed and effluent reduces overall utility consumption. Recycle designs increase overall conversion and enable the treatment of higher concentration acid gas streams. The GT-DOS process offers the inherent benefits of a single step process for H2 S removal and sulfur recovery, while avoiding the operating problems of aqueous redox or biological processes. The limited amount of equipment greatly reduces equipment cost, and reliability and maintenance issues. Applications GT-DOS is applicable to lean H2 S streams (< 10%) across a range of pressures (<1000 psi or 60 bar). GT-DOS is beneficial for operators who: • Have stranded sour natural gas • Need low capital cost bulk sulfur removal prior to a high efficiency tail gas clean-up operation or to enable a stream to be vented • Operate a conventional “modified Claus” plant The technology is particularly applicable for those that need sulfur removal for fuel gas applications, incinerators, or amine off-gas streams that need to be vented. Process Advantages • Does not require acid gas enrichment, can directly convert streams with low H2 S content • High pressure operation • Lower capital cost compared to “modified Claus”, liquid iron-redox, bio-sulfurization or non-aqueous liquid phase sulfur recovery processes • Operating costs comparable with conventional “modified Claus”, and significantly lower than liquid iron-redox or other non-aqueous sulfur recovery processes • High purity, saleable sulfur • Proven capability to handle higher hydrocarbon content compared to traditional direct oxidation, or liquid iron-redox approaches GTCTechnology 1001 S. Dairy Ashford, Suite 500 Houston,Texas 77077 USA Main +1-281-597-4800 Toll Free +1-877-693-4222 inquiry@gtctech.com | www.gtctech.com
- 3. GTCTechnology Engineered toInnovate GTCTechnology 1001 S. Dairy Ashford, Suite 500 Houston,Texas 77077 USA Main +1-281-597-4800 Toll Free +1-877-693-4222 inquiry@gtctech.com | www.gtctech.com Sour Gas Air BFW Steam Treated Gas Sulfur Condenser Reactor Figure 1 – Schematic of GT-DOS process, illustrating its simplicity. Depending on the level of sulfur recovery or H2 S level in theTreated Gas, the process may be run in recycle or multi-stage mode. Figure 2 – Operating Envelope for the GT-DOS Process Sulfur Plant Capacity (Ton/Day) H2 SinGas 100% 10% 1% 0.1% 0.01% Scavengers Liquid Redox Claus with Acid Gas Enrichment Claus GT-DOS Direct Oxidation 0.1 1.0 10.0 100 1,000 TM Engineered to Innovate To learn more about GTC Technology’s leading-edge technology solutions and the many ways we can help improve your operations and profitability, call us today at +1-281-597-4800, e-mail us at inquiry@gtctech.com or visit our Website at http://www.gtctech.com. GT-DOS™ is a trademark of GTCTechnology US, LLC.
- 4. +1-281-597-4800 inquiry@gtctech.com www.gtctech.com Engineered to Innovate® ©2014GTC Technology - All rights reserved. GTC Technology is a global licensor of process technologies and mass transfer solutions with the mission of creating value for our clients. Refining, petrochemical and chemical companies around the world rely on GTC’s advanced processes to optimize production capacity and efficiency. With insightful industry expertise, research capabilities and innovative thinking, GTC solves complex processing problems and has earned a reputation of excellence in designing and delivering high- quality, strategic solutions for clients worldwide. We’re engineered to innovate.