CRACKING PROCESS FOR REACTIVE DISTILLATION OF CHLOROSILANE SLURRY

Abstract

A cracking process for a reaction distillation of chlorosilane slurry includes feeding a chlorosilane slurry into a phase separator, drying a solid phase, feeding a chlorosilane polymer into a plate distillation column, returning kettle materials of the plate distillation column, and dividing a material produced from a top of the column. The process adopts an ionic liquid catalyst, which is environmentally friendly and reusable. The cracking and distillation of chlorosilane polymer are carried out simultaneously to shorten the time and increase the utilization rate of raw materials, which can reduce energy consumption and save costs and facilitate industrial production. A plate column is used as a distillation column, in which the two phases of the gas and liquid are sufficiently contacted. Therefore, the transfer of mass and heat is good, the production capacity is good, and the tower is not easily blocked, thereby making it easy to clean.

Claims

1. A cracking process method for a reaction distillation of a chlorosilane slurry, comprising: feeding the chlorosilane slurry into a phase separator, drying a solid phase in the phase separator, feeding a chlorosilane polymer into a plate distillation column for a cracking reaction under an action of an ionic liquid catalyst, returning kettle materials of the plate distillation column through a reboiler to the plate distillation column, dividing a material produced from a top of the plate distillation column through a condenser into two parts, returning a first part of the material to the plate distillation column, and obtaining a chlorosilane product from a second part of the material.

2. The cracking process method according to claim 1, wherein the cracking process method comprises a solid-liquid separation step and a reaction distillation step.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure shows a schematic diagram of a cracking process for a reaction distillation of chlorosilane slurry of the present invention.

[0012] Specifically, the reference numerals in the Figure are as follows: T1. plate distillation column; V1. phase separator; V2. buffer tank; El. condenser; E2. reboiler; S1. chlorosilane slurry; S2. phase separator produced material; S3. chlorosilane polymer; S4. tower top returning material; S5. chlorosilane; S6 and S7. tower kettle returning material.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Embodiment

[0013] Chlorosilane slurry (polysilyl chlorosilane high boiling substances with monosilyl chlorosilane and hexachlorosilane as main components, fine silica powder, and aluminum, titanium, iron, and other metal chlorides) is sent to the phase separator for a separation to achieve the solid-liquid separation. Insoluble solids such as silica powder in the chlorosilane slurry can be filtered out and dried. The filtrate containing the chlorosilane polymer is sent to the plate distillation column for cracking distillation to achieve the cracking reaction of the chlorosilane polymer under the action of an ionic liquid catalyst. The light components of the chlorosilane polymer undergo the steps of distillation, condensation, and extraction to obtain the chlorosilane product with a high recycling rate.