Energy-saving distillation system and method of chemical monomer

Abstract

The invention discloses an energy-saving distillation system and method of a chemical monomer. The system comprises a distillation system and a heating system, the distillation system comprises a high-boiling residue removing tower, a trichloromethylsilane upper tower, a trichloromethylsilane lower tower, a dimethyl dichlorosilane tower, a low-boiling residue removing upper tower and a low-boiling residue removing lower tower which are sequentially connected, wherein the trichloromethylsilane upper tower, the trichloromethylsilane lower tower and the dimethyl dichlorosilane tower are connected in series, and the low-boiling residue removing upper tower and the low-boiling residue removing lower tower are connected in series. The heating system is characterized in that a middle-pressure steam source is connected with a high-boiling residue removing tower reboiler, a steam outlet of the high-boiling residue removing tower reboiler is connected with a dimethyl dichlorosilane tower reboiler, a steam outlet of the dimethyl dichlorosilane tower reboiler is connected with a trichloromethylsilane upper tower reboiler and a trichloromethylsilane lower tower reboiler, a steam outlet of the trichloromethylsilane upper tower reboiler and a steam outlet of the trichloromethylsilane lower tower reboiler are both connected with a low-boiling residue removing upper tower reboiler and a low-boiling residue removing lower tower reboiler, and a steam outlet of the low-boiling residue removing upper tower reboiler and a steam outlet of the low-boiling residue removing lower tower reboiler are both connected with a low-boiling residue removing tower reboiler. The load of the high-boiling residue removing tower is increased, and the load of the low-boiling residue removing tower is decreased; repeated and gradient utilization of steam is achieved, and consumption of the steam is reduced.

Description

technical field [0001] The invention relates to the field of multi-component separation, in particular to an energy-saving rectification system and method for chemical monomers. Background technique [0002] Organosilicon is an important basic chemical raw material. The synthesis of organosilicon belongs to the category of fine chemical industry. The synthesis route is long, and the process control requirements of the monomer synthesis section are strict. In the production of organic silicon, the rectification process plays an important role, and it has an important impact on product quality, consumption and three-waste discharge. Under a certain pressure, using the different boiling points of the components in the material, the required components are obtained through multiple partial vaporization and partial condensation, and a continuous rectification process is formed according to the purpose of each tower. The monomer rectification unit is to separate the methyl chloro...

AI Technical Summary

Problems solved by technology

Although the multi-effect distillation of this system is conducive to improving the quality of the final product and achieving a certain effect of energy saving and emission reduction, the main product needs to be produced by three-effect evaporation, which increases the load of the de-lowering tower and limits the load of the de-higher tower

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