Vacuum potassium carbonate desulfurization

It’s probably used to analyze hydrogen sulfide. What are the operating costs of potassium carbonate in vacuum mode?

It provides the power to regulate pressure; at the same time, it adjusts the temperature of the acid vapor by exchanging heat with water, thereby controlling the amount of water vapor in the acid vapor.

Exhaling sour-smelling gaseeeeeeeeeeeeeeee

A vacuum pump is used to maintain a vacuum inside the regeneration tower and to transport the acid vapor released from within the tower to the Claus furnace; the regeneration tower is a device that uses low-temperature vacuum to release acid vapor from the liquid phase.

1. Process flow: The gas coming from the debenzene tower enters the desulfurization tower, where it comes into countercurrent contact with the lean liquid (potassium carbonate solution) originating from the regeneration tower, from bottom to top; acidic gases such as H2S and HCN in the gas are absorbed. H2CO3 + H2S → KHCO3 + KHS; K2CO3 + HCN → KHN + KHCO3; K2CO3 + H2O + CO2 → 2KHCO3. The gas after desulfurization (with H2S content ≤ 200 mg/m3) is used internally, while the rest is sent to external customers. The desulfurization rich liquid, which has absorbed acidic gases, exchanges heat with the hot lean liquid coming out of the regeneration tower before entering the regeneration tower for regeneration. Inside the regeneration tower, the rich liquid comes into counter-current contact with the water vapor rising from the bottom of the tower; under vacuum conditions, acidic components such as H2S and HCN are stripped out from the rich liquid. KHS + KHCO3 → K2CO3 + H2S; KHN + KHCO3 → K2CO3 + HCN; 2KHCO3 → K2CO3 + H2O + CO2. The depleted liquid from the regeneration tower is pumped out from the bottom of the tower using a dedicated pump for this purpose. After being cooled in a heat exchanger between the depleted and rich liquids as well as in a cooler, it is sent to the desulfurization tower for reuse. The acidic gas coming out of the regeneration tower is cooled in a condensing cooler and after the water is separated, a vacuum pump is used to send the acidic gas to the acid production unit. The lean liquid at the bottom of the regeneration tower is pumped out using a desulfurization liquid circulation pump and sent to the condensation blower unit to exchange heat with circulating ammonia water. The desulfurization liquid after heat exchange is sent back to the bottom of the regeneration tower. Steam is generated through the flashing device at the bottom of the regeneration tower, which serves as the heat source for regenerating the rich liquid in the regeneration tower. To ensure stable operation of the regeneration tower, a steam reboiler is installed to provide the heat required for rich liquid regeneration, using 0.7 MPa steam as the heat source. The small amount of KCNS and K4Fe(CN)6 salt solutions generated as side reactions in the system is sent to the ammonia vaporization unit. 2. Process characteristics: 1) Only KOH is used as the desulfurizing agent, resulting in low costs and simple operation ； 2) The regeneration of the rich liquid is carried out using vacuum distillation; the operating temperature is low, side reactions occur slowly, and little waste liquid is generated ； 3) The regeneration temperature is low, corrosion is minimal; the absorber, regenerator, and most of the equipment are made of carbon steel, resulting in lower investment costs.

The operating costs are fairly acceptable; it’s just that the investment required to build the plant is high

Vacuum pumps are used to create a vacuum, thereby putting the regenerator under negative pressure.

What factors are related to the instability of potassium carbonate in vacuum conditions?