Category Archives: Gas Processing

In the last “Tip of the Month”, we evaluated the accuracy of two commercial process simulators against the experimental data. In this “Tip of the Month”, we will evaluate the accuracy of three shortcut methods for prediction of depression of hydrate formation temperature in the presence of two common inhibitors, methanol (MeOH) or mono ethyleneContinue Reading

Many materials may be added to water to depress both hydrate and freezing temperatures. For many practical reasons an alcohol or one of the glycols is injected as an inhibitor, usually methanol, diethylene glycol (DEG) or mono ethylene glycol (MEG). All may be recovered and recirculated, but economic of methanol recovery may not be favorableContinue Reading

In this Tip of the Month, we will study two alternatives for removal of H2S and CO2 from natural gas. The process objective is to produce a sweet gas with less than 4 PPM H2S and the near total removal of CO2 due to the presence of a downstream nitrogen rejection unit (NRU). Each alternativeContinue Reading

In this Tip of the Month, we will study two alternatives for removal of H2S and CO2 from natural gas. The process objective is to produce a sweet gas with less than 4 PPM H2S and the near total removal of CO2 due to the presence of a downstream nitrogen rejection unit (NRU). Each alternativeContinue Reading

The best way to prevent hydrate formation (and corrosion) is to keep the pipelines, tubing and equipment dry of liquid water. There are occasions, rightly or wrongly, when the decision is made to operate a line or process containing liquid water. If this decision is made, and the process temperature is below the hydrate point,Continue Reading

In this Tip of the Month, we will explore the regeneration of molecular sieve dehydrators. Can you save energy by ending the heating cycle when the regeneration outlet temperature reaches approximately 90% of the regeneration inlet heating temperature? Frequent readers of the Tip of the Month surely know the answer: it depends! But on whatContinue Reading

In this Tip of the Month, we will show how to determine the optimum interstage pressure for a two-stage compression process. We will also study other operating condition such as feed temperature, heavy end in the feed, and water moisture. For this purpose, we used a commercial simulation package and the SRK EoS for theContinue Reading

Problems in meeting sales-gas dew point specifications are not unusual.  A facility engineer often suspects separator carryover when trouble-shooting such a plant.  Proper sizing of equipment for vapor-liquid separation is essential to almost all processes.  The fundamentals of a simple separator design may be extended to several other processes such as fractionation towers, two-phase flow,Continue Reading

In a previous “Tip of the Month” we discussed several methods of heavy ends characterization and as an example, for a rich natural gas, we tuned the heavy end parameters to match the experimentally measured saturation pressure. After tuning the heavy end parameters, we obtained a phase envelope for each method that passed through theContinue Reading

In a previous “Tip of the Month” we explained how a phase envelope is generated and what factors affect the shape and accuracy of a phase envelope. In this tip, we will show several methods of C7+ (heavy ends) characterization and check the accuracy of each method and present tips to improve the accuracy ofContinue Reading