Vacuum Desorption Module Unit

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The vacuum desorption module unit is a core functional component of VOC (Volatile Organic Compound) waste gas treatment systems, primarily used for the regeneration of adsorbents (such as activated carbon or molecular sieves). Once the adsorbent reaches saturation, the module employs a vacuum pump to evacuate the system, desorbing the organic compounds concentrated within the adsorbent's micropores; this restores the adsorbent's capacity, enabling cyclic reuse.

Featuring a skid-mounted or modular design, the unit integrates a vacuum pump, piping system, and control system. It can operate independently or be flexibly combined with adsorption, condensation, and absorption modules to form a comprehensive VOC treatment system.

2.1 Vacuum Desorption Process

Upon adsorbent saturation, the module activates the vacuum pump to evacuate the adsorption tank (achieving a vacuum level of -0.095 MPa or lower). In this low-pressure environment, the adsorption equilibrium of organic molecules within the adsorbent's micropores is disrupted; hydrocarbon components desorb from the adsorbent surface, forming a high-concentration vapor stream.

The desorbed high-concentration vapor can be:

Returned directly to oil storage tanks for liquefaction and recovery

Sent to an absorption tower to be dissolved and absorbed by an absorbent (e.g., gasoline or diesel)

Directed to a condensation unit for deep condensation and liquefaction

2.2 Enhanced Desorption Technologies (Upgrade Options)

Vacuum Oscillation Desorption: Intermittent evacuation of the adsorption tank causes the internal air pressure to fluctuate constantly. This disrupts the metastable state of the organic waste gas, resulting in higher desorption efficiency and superior performance.

Heat-Assisted Vacuum Desorption: Combining thermal desorption with vacuum desorption allows for the treatment of various organic waste gases at high concentrations (up to 50,000 mg/m³). This technology overcomes limitations regarding concentration ratios during the condensation of low-boiling-point substances, boosting the concentration ratio to over 5,000 times and achieving a desorbed gas concentration exceeding 95%.

Microwave + Vacuum Desorption: Utilizes combined microwave and vacuum desorption technology, integrating the processes of desorption, condensation, and recovery into a single unit.

2.3 Role within Combined Process Systems

Vacuum desorption modules are frequently used in combination with adsorption, condensation, and absorption modules. Taking a four-stage combined process-comprising low-temperature gasoline absorption, membrane separation, adsorption, and vacuum desorption-as an example, the adsorption and vacuum desorption modules perform deep purification of low-concentration tail gas, establishing a treatment system characterized by "multi-stage processing and layered safeguards." This combined technology can achieve emission concentrations as low as 1.51 mg/m³ and removal efficiencies exceeding 97%.

Adsorbent Recycling: Regeneration of adsorbents (such as activated carbon) is achieved via vacuum desorption, offering a service life of over five years.

High Desorption Efficiency: Vacuum levels reach below -0.095 MPa, ensuring thorough desorption and effective adsorbent regeneration.

Low Operating Costs: Unlike steam desorption, no steam is consumed; compared to heat-assisted desorption, pure vacuum desorption consumes only electricity.

High Safety: Low-temperature vacuum operation eliminates combustion risks, making it suitable for explosion-proof zones.

Modular Design: Skid-mounted structure allows for flexible configuration and capacity expansion based on requirements.

Intelligent Control: Fully automated PLC operation; the desorption cycle starts and stops automatically based on adsorbent saturation levels.

Vapor recovery systems: On-site regeneration of activated carbon adsorption tanks at gas stations, oil depots, and truck loading racks.

VOCs treatment: Desorption stage in adsorption-based waste gas treatment for industries such as chemicals, pharmaceuticals, and coating/painting.

Solvent recovery: Solvent recovery systems utilizing adsorption concentration, vacuum desorption, and condensation recovery.

Skid-mounted integrated equipment: Mobile, skid-mounted, modular units for the on-site desorption and regeneration of adsorbents.

Specific prices and delivery times are subject to actual quotation.

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