Continuous HMDS (hexamethyldisilazane) producing reaction system with enhanced mass transfer and flow and method

Abstract

The invention discloses a continuous HMDS (hexamethyldisilazane) producing reaction system with enhanced mass transfer and flow and a method. The reaction system comprises an ammonia gas absorbing device, a tubular reactor, a solid collecting device, a liquid collecting device, an upper reactor pipe part, a lower reactor pipe part, an emptying pipe, a liquid feed pipe, an ammonia gas feed pipe, aNH4Cl solid discharge pipe, a liquid discharge pipe, a nitrogen gas stirring pipe and a filter screen, wherein the upper part of the tubular reactor is the upper reactor pipe part; the lower part of the tubular reactor is the lower reactor pipe part; the emptying pipe and the liquid feed pipe are arranged on the upper reactor pipe part; the emptying pipe leads to the ammonia gas absorbing device;four feed and discharge pipes, namely the ammonia gas feed pipe, the NH4Cl solid discharge pipe, the liquid discharge pipe and the nitrogen gas stirring pipe respectively are arranged on the lower reactor pipe part; the NH4Cl solid discharge pipe leads to the solid collecting device; the liquid discharge pipe leads to the liquid collecting device, and the filter screen is attached to the pipe orifice thereof. The reaction system and the method are used for continuous production, so that mass transfer and heat transfer are facilitated, the reaction is speeded up, the production efficiency is improved and the production capacity is increased.

Description

technical field [0001] The invention relates to a reaction system and method for continuous production of HMDS with enhanced mass transfer and flow. The reaction system and method are rapid, and both gas, liquid and solid materials can be smoothly fed in and out to realize stable and continuous reaction, and are mainly used in chemical plants. Background technique [0002] Hexamethyldisilazane (HMDS) is a colorless transparent liquid, non-toxic, with a slight amine smell, and its density at 25 °C is 0.770-0.780 g / cm 3 , the boiling range is 125-127°C. It is miscible with a variety of organic solvents and rapidly hydrolyzes in contact with air to form trimethylsilanol and hexamethyldisiloxane (HMDO). HMDS is an important organosilicon reagent and is widely used in the fields of organosilicon and organic synthesis. It is an important raw material for the synthesis of hexamethyldisiloxane, and an indispensable reagent in the process of synthesizing semi-synthetic antibiotics ...

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Problems solved by technology

The heat transfer and mass transfer efficiency of the tank reactor is low, so the reaction time is longer, and additional time such as auxiliary time is required for intermittent operation, which makes the reaction time longer and greatly limits the production capacity

And in the tank reactor, the NH produced in the reaction 4 The accumulation of Cl particles is easy to wrap the raw materials, which will also affect the fluid flow and mass transfer of the reaction

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