Extraction liquid separation and recovery system designed by Chongqing New Materials Technology Co., Ltd.

The main task is to process the extracts produced during the production of lithium battery separators, the main components of which are dichloromethane and white oil. The technical solution of the project adopts the "dichloromethane double-effect distillation + white oil vacuum distillation" process, which greatly reduces energy consumption through efficient distillation technology, and further optimizes energy utilization efficiency by using the waste heat recovery system. The design standards comply with many national and industry regulations to ensure the stability and safety of the equipment. In addition, the project also introduced a one-button start-stop automatic control solution to improve operational efficiency and safety.

The key technologies of this project include

1. Double-effect dichloromethane distillation tower

Principles and advantages:

The system consists of two towers with different operating pressures, namely a pressurized MC distillation tower and a normal-pressure MC distillation tower.

The overhead gas of the pressurized MC distillation tower is used as the heat source of the reboiler of the atmospheric pressure MC distillation tower, realizing the effective recovery and utilization of thermal energy.

The heat released by the condensation of the overhead gas of the pressurized MC distillation tower is used as the condenser of the atmospheric pressure MC distillation tower, further improving the energy utilization efficiency.

Energy saving points:

Steam saving: By utilizing the overhead gas of the pressurized MC distillation tower as the heat source for the reboiler of the atmospheric pressure MC distillation tower, a large amount of steam consumption is saved.

Cooling water saving: By using the condensing medium of the pressurized MC distillation tower as the condenser of the atmospheric pressure MC distillation tower, a large amount of cooling water can be saved.

2. Atmospheric tower feed preheater

Principle and advantages: The preheater uses the waste heat of liquid steam and uses condensed water as a heat source to exchange heat with the feed mixed liquid of the atmospheric tower.

This can increase the feed temperature of the atmospheric tower and reduce the energy demand for subsequent heating, thus saving energy consumption.

Energy saving points:

Reduce steam consumption: Utilize the waste heat of steam condensate to reduce the steam consumption of some pressurized MC distillation towers.

3. Gas recovery system

Principles and advantages:

The gas recovery system exchanges heat between the desorbed gas and circulating hot water, and returns the recovered hot water to the liquid phase recovery hot water tank, which is then used for heat exchange between the preheater and the atmospheric tower feed mixed liquid.

This process effectively recovers heat and reduces the consumption of liquid phase recovery steam and the use of gas recovery circulating water.

Energy saving points:

Heat recovery: By recovering the heat of the desorbed gas in the gas recovery system, the consumption of liquid phase recovery steam is reduced, and the consumption of gas recovery circulating water is also reduced.

Through the comprehensive application of these technical solutions, the project not only effectively treated methylene chloride and white oil in the extraction solution, but also achieved significant optimization in energy consumption and operating efficiency, meeting environmental protection and energy-saving requirements while ensuring equipment operation. stability and security.