Description

Project Overivew 

This Ammonium Chloride & DMF Recovery System is designed to efficiently recover both high-purity ammonium chloride crystals and dimethylformamide (DMF) solvent from ammonium chloride process solutions. By integrating advanced evaporation, crystallization, centrifugation, and distillation technologies, the system maximizes resource utilization while significantly reducing operating costs and environmental emissions.

The solution is suitable for treating ammonium chloride solutions containing DMF and enables the recovery of valuable products for reuse in the production process, supporting both sustainable manufacturing and circular economy initiatives.

Process Technology     

Based on the characteristics of the feed solution, a single-effect forced circulation evaporative crystallization system is adopted for ammonium chloride recovery, combined with multi-stage distillation for DMF purification.

The ammonium chloride solution is continuously concentrated in the forced circulation evaporator until supersaturated state is reached. The supersaturated slurry then enters into the crystallization section, where further crystal growth takes place. The crystal slurry is subsequently discharged to a centrifuge for solid-liquid separation. The ammonium chloride crystals are collected as the final product, while the separated mother liquor is recycled back to the evaporator for further concentration and crystallization, forming a continuous closed-loop process.

Meanwhile, the secondary vapor generated during evaporation, containing DMF and water vapor, is directed to the distillation section for solvent recovery. Through a staged distillation process, DMF is progressively purified to a recovery purity of up to 99 wt.%, making it suitable for reuse in the production process.

Equipment Description

The system consists of a single-effect forced circulation evaporative crystallization system integrated with the first-stage DMF distillation tower, providing a reliable and efficient solution for simultaneous salt crystallization and solvent recovery.

The system is designed to deliver:

•  High-purity ammonium chloride crystal recovery.

•  Efficient DMF recovery for subsequent purification to 99 wt.%.

•  Stable and continuous operation with high processing efficiency.

•  Optimized energy utilization to minimize steam consumption.

•  Safe, reliable operation through robust equipment design and comprehensive safety features.

•  Flexible system configuration to meet different feed compositions and production capacities.

System Features

Our integrated recovery system offers the following advantages:

• High recovery efficiency

Maximizes the recovery of both ammonium chloride crystals and DMF solvent, improving product yield and economic value.

• Forced circulation evaporative crystallization

High circulation velocity effectively prevents heat exchanger tube blockage caused by high salt concentrations, minimizes scaling, enhances heat transfer efficiency, extends continuous operating time, and reduces cleaning frequency.

• Energy-efficient design

Optimized heat integration reduces fresh steam consumption and lowers overall operating costs.

•  Reliable and continuous operation

Designed for long-term, reliable operation with minimal maintenance requirements.

•  Advanced automation

PLC-based intelligent control enables continuous, fully automatic operation while reducing labor requirements.

•  Robust equipment design

Engineered with comprehensive safety considerations to ensure reliable operation under demanding process conditions.

•  Flexible system configuration

System capacity and configuration can be tailored to specific feed compositions, product requirements, and customer process conditions.

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