A continuous washing device for polyphenylene sulfide resin

Abstract

The invention relates to a continuous washing device for polyphenylene sulfide resin, which includes a feeding mechanism and a washing mechanism. The washing mechanism includes a horizontal cylinder arranged obliquely and a vertical cylinder connected thereto. The vertical cylinder Set on the upper part of the relatively higher side of the horizontal cylinder; the top of the vertical cylinder is provided with a washing liquid outlet; the relatively higher side of the horizontal cylinder is provided with a slurry inlet, and the feeding mechanism is connected to the slurry inlet ; The relatively lower side of the horizontal cylinder is respectively provided with a washing liquid inlet and a slurry outlet, and the slurry outlet is located at the lower part of the washing liquid inlet; an agitator driven by a motor is arranged axially in the horizontal cylinder, and the The stirrer includes several stirring paddles. The device can greatly reduce the content of high-boiling-point solvents in the resin by consuming less washing liquid, and achieve the technical effect of fully washing the solvent while reducing rectification and separation energy consumption.

Description

technical field [0001] The invention relates to a post-processing device for polyphenylene sulfide resin, in particular to a continuous washing device for polyphenylene sulfide resin. Background technique [0002] Polyphenylene sulfide (PPS) resin is a new type of high-performance thermoplastic material, which is usually produced by solution polymerization, using high-boiling N-methylpyrrolidone (NMP) or hexamethylphosphoric triamide (HMPA) as Reaction solvent. The raw materials of the reaction are p-dichlorobenzene and sodium sulfide, and the crystallization of the by-product sodium chloride in the solvent helps the reaction to proceed toward the direction of increasing the degree of polymerization. After the reaction is completed, the temperature of the slurry is high, and it needs to be cooled first, and the solvent, fine powder (PPS particles with small particle size) and sodium chloride crystals are screened out from the resin, and then washed to remove the remaining s...

AI Technical Summary

Problems solved by technology

There are two main problems in this scrubber: one is that the resin in the scrubber moves slowly, the mass transfer boundary layer where the solvent diffuses from the resin to the washing liquid is thicker, and the processing capacity per unit volume is small; the other is that the mass transfer is improved by increasing the concentration difference Effect, it needs to consume a large amount of washing liquid, and the energy consumption is relatively large when rectifying and separating washing liquid and solvent

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