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Comment PDF Separation Processes

Operating Strategies for Gas Dehydration Units

By Krishnan Madan Mohan and Suman Pachal, WorleyParsons Engineering Oman |

The presence of certain contaminants can wreak havoc on gas dehydration systems and other similar separation processes, but there are design measures that can help to minimize the issues caused by these substances The presence of the aromatic compounds benzene, toluene, ethylbenzene and p-xylene (BTEX) and acid gases, such as hydrogen sulfide (H 2 S) and carbon dioxide (CO 2), in the wet gas of tri-ethylene glycol (TEG) gas-dehydration units (Figure 1) can result in numerous operating problems. These problems can be minimized by optimizing certain operating parameters and paying careful attention to details during the equipment design stage. This article presents several ways to minimize operating and maintenance problems in TEG gas-dehydration processes. FIGURE 1. This schematic shows the layout of a typical gas-dehydration unit[/caption] In TEG-based natural-gas dehydration units, most operating and maintenance problems usually occur when the circulating glycol becomes contaminated. The contaminated glycol has a tendency to cause foaming and fouling. Foaming can increase glycol loss and reduce plant capacity. Foaming can also result in poor mass transfer between the gas and the glycol solution and can affect treated-gas quality.…
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