Systems for closed loop regeneration of gas dehydration units using liquid petroleum gas

A system for regenerating a gas dehydration unit containing saturated mole sieve used in a process for dehydrating a natural gas feed stream, comprising:

• a. a storage tank for storing liquid propane and/or butane;
• b. a pump for pumping the liquid propane and/or butane from the storage tank;
• c. at least two heat exchangers in series for receiving the liquid propane and/or butane and converting the liquid propane and/or butane to a hot propane gas and/or butane gas;
• d. a regeneration gas inlet in the gas dehydration unit containing the saturated mole sieve to be regenerated for receiving the hot propane and/or butane gas such that the hot propane gas and/or butane gas passes across the saturated mole sieve thereby regenerating the mole sieve;
• e. a condenser in communication with a regeneration gas outlet in the gas dehydration unit for receiving an overhead stream containing the hot propane gas and/or butane gas from the gas dehydration unit and dropping the temperature to form a fluid stream containing liquid propane and/or butane, and containing water and non-condensable gas;
• f. a three phase separator in communication with the condenser for separating the fluid stream into a gas stream, a water stream, and a liquid stream comprising liquid propane and/or butane;
• and
• g. a line in communication with the three phase separator for returning the liquid propane and/or butane to the storage tank.