I. Anhydrous Sodium Sulfide Dryer--Overview of Equipment

PPS is prepared by an anhydrous sodium sulfide mash dryer. This method can be applied to industrial production operations. The invention adopts a vacuum kneading dryer to indirectly heat the material which is difficult to remove, such as crystal water, and protects the material by using nitrogen gas during the feeding stage and the discharging stage, and vacuum operation during the drying process to avoid The oxidation of the material; in the drying process, the multi-stage heating (80-170 ° C) drying method is adopted to avoid the melting of the material and the bonding of the wall; in the tail gas treatment stage, the washing part is washed by the washing tower and the moisture part thereof The harmful gases have been effectively treated, thereby solving a series of problems caused by the preparation of the existing PPS using anhydrous sodium sulfide by drying.

In order to solve the problem that the sodium sulfide material is prone to oxidation, melting and tail gas treatment. Jiangsu Bohong PPS preparation method of anhydrous sodium sulfide. The method achieves the effect of isolating oxygen by introducing nitrogen gas during the feeding and discharging process and drying under vacuum, and the temperature range is 80-170 ° C by the five-stage heating method, which can effectively Solving the problem of melting and agglomerating of sodium sulfide materials, as well as the discharge of exhaust gas, it can also be washed by washing tower to achieve the purpose of removing toxic gases.