I would like to ask: what determines the ability of oil and gas recovery as well as vacuum desorption to reduce the temperature inside the adsorption tower to extremely low levels?

The use of vacuum desorption in oil and gas recovery to reduce the temperature in the adsorption tower to extremely low levels is related to the following factors: 1. **Vacuum level**: The higher the vacuum level, that is, the lower the pressure within the system, the lower the evaporation temperature, which in turn helps to release more heat and achieve a cooling effect. 2. **Types and properties of adsorption materials**: Different adsorption materials (such as activated carbon, zeolites, etc.) have varying capacities for gas adsorption and thermal desorption, which affect the cooling efficiency during the desorption process. 3. **Flow rate and distribution of the desorbent**: Increasing the flow rate of the desorbent (usually an inert gas or steam) appropriately can improve heat exchange efficiency and facilitate a faster temperature drop. 4. **Thermal insulation performance of the system**: A good thermal insulation design can reduce the influx of external heat, maintaining a low temperature inside the system. Calculating the temperature reduction in the adsorption tower to the limit temperature usually requires applying the principles of material balance and energy balance. The specific calculation method can be followed by the following steps: a. **Determine the initial and final states of the system**: including pressure, temperature, component concentrations, etc., at the start and end. b. **Application of the law of conservation of energy**: To calculate the heat absorbed during adsorption and the heat released during desorption, it is necessary to take into account parameters such as the specific heat capacity of the adsorbent material and its latent heat of vaporization. c. **Apply the law of conservation of mass**: Analyze the changes in various components by considering the input and output of materials, and then use the energy balance equations to carry out calculations. The specific calculations involve knowledge from various fields such as thermodynamics, physical chemistry, and fluid dynamics. In industrial applications, specialized chemical simulation software is usually required for more accurate design and verification. .

During the oil and gas recovery process, vacuum desorption is employed after adsorption becomes saturated, which allows the temperature inside the adsorption tower to be reduced to extremely low levels. This is mainly due to the mechanism by which the adsorption equilibrium is disrupted during vacuum desorption. In oil and gas recovery processes, when the adsorber becomes saturated, a vacuum pump is used to create a vacuum within the adsorber, thereby reducing the pressure there and disrupting the adsorption equilibrium. This process releases the oil and gas adsorbed in the adsorber, which are then pumped via a vacuum pump to the front end of the condensation process for further condensation, liquefaction, and recovery. This method of disrupting the adsorption equilibrium by reducing pressure helps to lower the temperature inside the adsorption tower to an extremely low level, thereby enabling effective recovery of oil and gas. This process involves not only the principles of physical adsorption, but also the application of vacuum technology. In this way, the efficiency and effectiveness of oil and gas recovery can be significantly improved

In practice, steam desorption is carried out first, and after that, vacuum desorption is performed under high temperatures inside the tower. What determines the ability to reduce the temperature inside the tower to its minimum value in this case? How do I calculate it?

The extreme low temperature is first related to the maximum vacuum level that the system can achieve, and secondly it is influenced by the extent of external heat exchange as well as the condition of the incoming material