Method and device for synthesizing tetramethylammonium bicarbonate by microchannel reactor

Abstract

The invention provides a method and a device for synthesizing tetramethylammonium bicarbonate by a micro-channel reactor, which are characterized in that a micro-channel reactor module is heated to a preset temperature by a heat exchange medium, and raw materials of dimethyl carbonate and trimethylamine and a solvent methanol are pumped into the reactor by a metering pump for continuous reaction. The material discharged from the micro-channel reactor enters a first falling film evaporator after being subjected to flash evaporation, and part of the solvent and unconverted raw materials are recycled through the first falling film evaporator. Materials discharged from the bottom of the first falling-film evaporator and pure water are mixed through a static mixer to generate hydrolysis reaction and enter a second falling-film evaporator to separate part of methanol and water. And feeding the material discharged from the bottom of the second falling film evaporator into a rectifying tower to further separate methanol, and extracting a refined product from a tower kettle. The reaction safety can be effectively improved, the reaction time is shortened, the reactant conversion rate is improved, the equipment occupied area is small, the power consumption is low, the investment is saved, continuous production can be realized, and the product quality is stable.

Description

technical field [0001] The invention relates to a method for synthesizing tetramethyl ammonium bicarbonate, in particular to a method for synthesizing tetramethyl ammonium bicarbonate using a microchannel reactor, and belongs to the field of fine chemicals. Background technique [0002] Tetramethylammonium hydroxide (TMAH) is an organic base with the strongest alkalinity. TMAH is used as developer and etchant in liquid crystal and semiconductor chip industries. [0003] Tetramethylammonium hydroxide can be prepared by electrolysis of tetramethylammonium chloride, but chloride ions are corrosive to electrolysis devices, and electrolysis produces toxic chlorine gas. Tetramethylammonium hydroxide is prepared by electrolysis with tetramethylammonium bicarbonate as the raw material, and the anode produces carbon dioxide, which avoids the generation of toxic gas and reduces the corrosiveness to the equipment at the same time. [0004] Tetramethylammonium bicarbonate can be synthe...

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Problems solved by technology

[0003] Tetramethylammonium hydroxide can be prepared by electrolysis of tetramethylammonium chloride, but chloride ions are corrosive to the electrolysis device, and electrolysis produces toxic chlorine gas

[0012] 1. The reaction is an exothermic reaction, and the accumulation of materials in the reactor of the prior art scheme is relatively large, which does not completely solve the safety problem;

[0013] 2. The existing technical solutions all have the problem of long reaction residence time;

[0014] 3. A longer residence time will inevitably lead to a larger reactor volume, which increases the cost and floor area, which is not conducive to increasing production capacity

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