Method and device for recovering efficient high-boiling substance from organic silicon residue slurry

Abstract

The invention provides a method and a device for recovering efficient high-boiling substance from organic silicon residue slurry. The method mainly comprises the following steps: discharging residue slurry from a reboiler of an organic silicon monomer synthesis washing tower into a distillation still; utilizing waste heat to evaporate high-boiling residues in the residue slurry; carrying out rectification in a packing tower; collecting the recificated product; conveying the collected product into a high-boiling lysis device; cooling down residual slug; discharging the cooled residual slug. The invention has the advantages that the waste heat of the monomer synthesis system is sufficiently utilized, and the temperature of the distillation still and the evaporation rate of the high-boiling residue are controlled, part of high-boiling residue of high lysis value is selectively recovered. Practices show that the lysis rate of the high-boiling residue treated according to the method reaches 80 percent or higher in lysis rate, the solid content of discharged residue is improved by 15 to 25 percent, the utilization value of the high-boiling residue is greatly improved, and the residue slug treatment cost is reduced.

Description

technical field [0001] The invention belongs to the field of chemical organosilicon production and provides a method for recovering effective high boilers from organosilicon slurry. Background technique [0002] With the improvement of our people's living standards and comprehensive national strength, the demand for organosilicon monomers and organosilicon materials is increasing rapidly. According to statistics, by the end of 2011, the total production capacity of 15 domestic methylchlorosilane monomer manufacturers reached about 1700kt / a. 3~5% of the total output, the organosilicon monomer production device with a production capacity of 80kt / a, produces about 2400~4000 tons of slurry every year. [0003] The composition of organosilicon slurry is complex, mainly composed of a large amount of liquid high boilers (disilane, siloxane, trisilane, etc., which are produced during the synthesis of methyl chlorosilane monomer and have a boiling range of 80-215°C). Mixture) and a...

AI Technical Summary

Problems solved by technology

This method recovers a large amount of high boiling matter, but contains less active ingredients (disilane and trisilane). Therefore, a large amount of recovered high boiling matter cannot be effectively used and becomes waste again; the solid content of the slurry in the evaporator is high , resulting in high requirements for conveying devices and stirring devices

Images