How to recover VOCs waste gas from mixed solvents? Analysis of Multi component Condensation and Mass Recovery Scheme

The fine chemical and pharmaceutical workshops often rotate the production of multiple varieties, and the exhaust often contains multiple components such as esters, ketones, alcohols, and even halogenated hydrocarbons, making it difficult to directly apply a single solvent recovery approach. The core of treating mixed solvent VOCs waste gas lies in quality recovery: utilizing the differences in boiling points and condensation characteristics of each component, liquefying them separately through staged condensation, and then treating residual tail gas through membrane separation to achieve high recovery rate and stable compliance.

Why is it difficult to treat mixed solvent waste gas

• The boiling point range of each component is large, and the same condensation temperature cannot accommodate all components;
• Light components inhibit the condensation of heavy components, resulting in a decrease in single-stage condensation recovery rate;
• Mixing different components of recycled liquid can affect its reuse value.

Process arrangement for quality based recycling

1. Component investigation: Sort out the list of commonly used solvents and exhaust concentration distribution in the workshop;
2. Graded condensation: Set multi-stage condensation temperatures according to boiling points, with heavy components first liquefied and light components enriched;
3. Membrane separation completion: The residual mixed exhaust gas is purified by VOCs separation membrane to meet the standard, and the permeate side is refluxed and circulated;
4. Collection of recycled liquid in separate tanks: Collect according to the condensation stage to maintain a relatively single component for easy reuse.

Comparison of Mixed Storage and Quality based Recycling

Key points of scheme design

Before designing the mixed solvent recovery device, it is recommended to provide a list of solvent usage and exhaust condition data in the workshop, based on which the number of stages, condensation temperatures at each stage, and membrane component configuration can be determined. The device is prefabricated and pre assembled, with reserved component switching allowance to adapt to the adjustment of wheel production varieties.

Does the device need to be redesigned if the variety is frequently adjusted?

During the design phase, there is a margin left in the list of commonly used varieties, and routine adjustments are made through fine-tuning of operating parameters without the need to modify hardware.

Can mixed gases containing halogenated hydrocarbons also be processed?

Halogenated hydrocarbons can be efficiently liquefied and recovered in the condensation section, and materials and seals are specially selected based on medium compatibility.

LuoyangWohong PetrochemicalEquipment Co., Ltd. (Wohong Petrochemical) focuses on the design and manufacturing of VOCs organic solvent liquefaction and recovery equipment, supporting customization according to solvent types and working conditions. Welcome to inquire by phone.