Concentration process of VOCs by gas separation membrane

    gas separation membraneVOCs concentration process

The gas separation membrane VOCs concentration process is a kind of waste gas pretreatment technology with membrane separation as the core. The process uses the difference in the permeation rate of different gas molecules in the polymer membrane material to selectively enrich the organic matter in the exhaust gas, realize the conversion of low-concentration exhaust gas to high-concentration concentrated gas, and create favorable conditions for the subsequent condensation or adsorption unit.

The core of the process is a polymer membrane with selective permeability. After the exhaust gas enters the membrane module, driven by the pressure difference on both sides of the membrane, the organic solvent molecules preferentially penetrate the membrane layer, forming a high concentration of concentrated gas on the permeation side; nitrogen, oxygen and other air components are trapped on the upstream side of the membrane and discharged directly as purified gas. Through this process, the concentration of organic matter in the exhaust gas can be increased by 5 to 10 times, and the volume flow rate can be reduced accordingly.

The concentrated high-concentration gas enters the subsequent processing unit. If the supporting condensation process, due to the treatment air volume has been greatly reduced, the concentration has been significantly increased, the specifications of the condensing equipment and refrigeration energy consumption can be reduced; if the supporting adsorption process, concentrated gas can be directly sent to the adsorption device, the saturation period of the adsorption material extended, the replacement frequency decreased.

The process is electrically driven, operates at room temperature, and does not require heating or cooling. The membrane module adopts a modular design, and when the processing air volume increases, it can be expanded by adding components in parallel without replacing the whole set of equipment. There is no open flame in the process, and it has good applicability in explosion-proof places such as chemical industry, pharmacy and storage tank area. Membrane separation is a pure physical process, no consumables replacement, no secondary pollution.

The process is suitable for VOCs waste gas in the medium and high concentration range. When the concentration of exhaust gas is above 1000mg/m³, the concentration effect is more obvious; when the concentration is too low, the driving force is insufficient, the concentration multiple is limited, and the economy is reduced. Before the exhaust gas enters the membrane module, it needs to be pre-treated to remove dust, oil mist and excess moisture, so as to avoid the membrane surface pollution affecting the separation performance and service life.

The gas separation membrane concentration process is not used alone as a terminal treatment device, and its value lies in creating conditions for subsequent condensation recovery or adsorption purification. In the membrane condensation combination process, the membrane is responsible for concentration and condensation is responsible for recovery, and the two cooperate to form a complete VOCs resource treatment chain. LuoyangWohong PetrochemicalEquipment Co., Ltd. focuses on this field and can match membrane module specifications according to exhaust gas composition and concentration. Before selection, it is recommended to complete the working condition detection and speak with data.