Abstract: A still/stahl column includes a still section, a primary stahl section, the primary stahl section positioned beneath the still section, and a polishing stahl section, the polishing stahl section positioned beneath the primary stahl section. A process also includes feeding a water rich glycol still feed stream to the still section and feeding a stripping gas feed stream to the polishing still section. The process includes withdrawing a reboiler draw stream from the still section and heating the reboiler draw stream in a reboiler to form a reboiler inlet stream. The process includes injecting the reboiler inlet stream into the primary stahl section, stripping water from the water rich glycol with the stripping gas, and withdrawing a still stripping gas stream from a top portion of the still section. A lean glycol polishing discharge stream is withdrawn from a bottom portion of the polishing stahl section.

Abstract: A still/stahl column includes a still section, a primary stahl section, the primary stahl section positioned beneath the still section, and a polishing stahl section, the polishing stahl section positioned beneath the primary stahl section. A process also includes feeding a water rich glycol still feed stream to the still section and feeding a stripping gas feed stream to the polishing still section. The process includes withdrawing a reboiler draw stream from the still section and heating the reboiler draw stream in a reboiler to form a reboiler inlet stream. The process includes injecting the reboiler inlet stream into the primary stahl section, stripping water from the water rich glycol with the stripping gas, and withdrawing a still stripping gas stream from a top portion of the still section. A lean glycol polishing discharge stream is withdrawn from a bottom portion of the polishing stahl section.

Abstract: A glycol dehydration unit includes four subsystems. The glycol contact system, a rich glycol handling system, a rich glycol lifting system and a glycol regeneration system. The rich glycol lifting system lifts the rich glycol from a rich glycol heater to an entry point on a still stahl column and provides for the introduction of stripping gas for the purpose of further removing water from process gas. The glycol dehydration unit uses heretofore undiscovered characteristics of a reboiler and stahl column system.

Abstract: According to the present invention, an inexpensive co-current and counter-current gas dehydration system, contactor apparatus, and operating method is provided which does not result in a need to clean equipment on a frequent basis. More specifically, there is provided a dehydration system, contactor apparatus, and method for removing water from a stream of wet natural gas which minimizes formation or iron sulfide scale within the contactor apparatus to maintain sufficient water removal capacity and to reduce operator cleanup and construction expenses. The instant invention improves the utilization of the water absorbing capabilities of glycol by using partially water laden glycol extracted from the central portion of the contactor apparatus in a co-current flow with wet natural gas to maximize the operating efficiency of the contactor apparatus.