Refining Petroleum for Chemicals by Gould R.F. (ed.)

By Gould R.F. (ed.)

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Loses also occur from vaporization and carry over in the reboiler. Injection Requirement Categories Low Pressure–High Volume Pressures up to 2000 psi and volumes measured in hundreds to thousands of BPD. 1 40 Gas Dehydration Field Manual FIGURE 1-20 Boiling points and condensation temperatures of aqueous diethylene glycol solutions at various pressures. High Pressure–Low Volume Pressures up to 15,000 psi and volumes measured in quarts or a few gph. High Pressure–High Volume Pressures exceeding 5000 psi and volumes measured in several gpm or barrels per minute.

1 38 Gas Dehydration Field Manual Dow Chemical Company Guidelines If glycol is to be injected into a natural gas transmission line where glycol recovery is of less importance than hydrate protection, ethylene glycol is the best choice because it produces the greatest hydrate depression and has the highest vapor pressure of any of the glycols. If glycol is to be injected into a unit where it will contact hydrocarbon liquids, ethylene glycol is preferred because it has the lowest solubility in high molecular weight hydrocarbons.

For each component in the inlet gas stream, there will be a section of bed depth, from top to bottom, where the desiccant is saturated with that component and where the desiccant below is just starting to adsorb it. The depth of bed from saturation to initial adsorption is the mass transfer zone (MTZ). MTZ is simply a zone or section of the bed where a component is transferring its mass from the gas stream to the surface of the desiccant. As the flow of gas continues: The MTZs move downward through the bed and water displaces all of the previously adsorbed gas until, finally, the entire bed is saturated with water vapor.

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