Removal of sulfur compounds from gas

A method of removing sulfur compounds from a gas, comprising:

• discharging a tail gas comprising sulfur compounds from a sulfur recovery unit (SRU) to a non-thermal plasma (NTP) catalytic unit comprising an NTP reactor;
• providing an oxidant to the NTP reactor and placing the oxidant in an NTP state in the NTP reactor to give an oxidative reactive species formed from the oxidant;
• oxidizing the sulfur compounds with the oxidative reactive species and catalyst in the NTP catalytic unit into sulfur oxides (SOx);
• discharging process gas from the NTP catalytic unit to a quench tower, the process gas comprising the tail gas having the SOx formed by oxidizing the sulfur compounds;
• absorbing SOx from the process gas into water in the quench tower;
• discharging from the quench tower an overhead gas comprising the process gas without the SOx absorbed into the water;
• discharging from the quench tower a bottoms stream comprising the water having the absorbed SOx to a membrane degassing unit comprising a membrane;
• removing SOx from the water in the membrane degassing unit;
• and
• discharging the SOx as removed from the membrane degassing unit to a reaction furnace of the SRU.