The candle filter separates the salt in the toluene solution

I. Project Background

  The Indian customer needs to achieve efficient separation of salt impurities in the toluene solution. The working condition parameters of the solution are as follows: The filtration flow rate is 1.5 cubic meters per hour, the system viscosity is relatively low, the operating temperature is maintained at 80℃, the solid content fluctuation range is 8%-10%, and the target filtration accuracy requirement is 5 microns. Given the client's strict requirements for on-site hygiene conditions and the fact that the project has a small-scale experimental nature, after a comprehensive assessment, it is recommended to use candle filters as the core treatment equipment. This equipment, with its composite filtration structure of filter elements and filter cloths, can achieve high-precision solid-liquid separation. At the same time, it features excellent sealing performance, ensuring stable and reliable filtration effects. ​

Ii. Design of Filtration Scheme

  A candle filter with a filtration area of 10 square meters was selected. After calculation, the thickness of the filter cake formed could reach 15-20mm. To ensure the stable operation of the system, the parameters were calculated based on a thickness of 15mm during the design stage. The filtration cycle for a single batch is approximately 1 hour, and a single filtration can hold 150 liters of solid materials. The operation process of the equipment covers five technological stages: reflux pre-filtration, precision filtration, high-pressure pressing and dewatering, reverse blowing filter element regeneration and sludge discharge and unloading. Through the coordinated operation of each link, efficient and continuous solid-liquid separation operation is achieved. ​