Liquid sulfur degassing

A method of treating liquid sulfur containing polysulfides and hydrogen sulfide, comprising:

• contacting the liquid sulfur with stripping gas in a contact zone of a degassing vessel, thereby froth is formed in the degassing vessel and there is a level of froth in the degassing vessel;
• determining a level of the liquid sulfur in the degassing vessel, wherein the determining the level of the liquid sulfur in the degassing vessel comprises:
• measuring a second level of the liquid sulfur via a sensor in a level bridle that is fluidly connected to the degassing vessel, wherein the sensor is configured to measure liquid level via differential pressure, radar, capacitance, or combinations thereof, where the second level is different than the level of froth present on the liquid sulfur within the degassing vessel;
• and
• determining the level of the liquid sulfur in the degassing vessel based on the second level measured in the level bridle by analyzing and calculating the level of the liquid sulfur in the degassing vessel based on correlation data stored on the memory of a controller;
• and
• controlling the level of the liquid sulfur in the degassing vessel based on the step of determining the level of the liquid sulfur in the degassing vessel.