What should be noted when using nitrogen for desorption after VOC adsorption? How much nitrogen is required?

After VOC adsorption, the following points should be taken into account when using nitrogen for desorption: 1. The temperature during the desorption process needs to be controlled; it is generally carried out at room temperature to avoid pyrolysis or other adverse effects on the VOCs； 2. The nitrogen flow rate needs to be determined based on factors such as the amount of adsorption, the storage material, and the conditions; a range of 20–50 mL/min is recommended ； 3. During the desorption process, it is necessary to ensure that nitrogen enters the adsorber in order to completely desorb the adsorbent ； 4. After desorption, it is necessary to sample the collected gas sample in order to analyze information such as VOC concentrations. Generally speaking, the nitrogen consumption varies depending on various factors; it is recommended to make flexible adjustments based on the actual situation. .

The amount of nitrogen required depends on the actual circumstances; it is also determined by the adsorption efficiency of the activated carbon, the type of oil and gas, as well as the analysis of the gases emitted, in order to increase or decrease the amount of nitrogen used for desorption. I’ve worked on Whittle’s oil and gas recovery processes; the desorption process takes between 15 and 10 minutes, it’s carried out using low-pressure nitrogen, and the instantaneous volume is around 5000 cubic feet – I can’t remember the exact figure

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