Reaction kettle suitable for intermittent mixed acid nitration

Abstract

The invention discloses a reaction kettle suitable for intermittent mixed acid nitration. The reaction kettle is characterized in that a kettle cover is a standard ellipsoidal head and is provided with a liquid charging hole, view monitors, a hand hole, a thermometer hole and a vent; a shaft base is arranged at the top of the kettle cover; a stirring motor is arranged on the shaft base; the stirring motor is connected with the upper end of a stirring shaft; a main stirring paddle and an auxiliary stirring paddle are fixed on the stirring shaft; a coil pipe outlet and a thermometer connector are arranged on the sides of a kettle body; a coil pipe inlet, a material outlet and an emergent discharge hole are arranged at the bottom of the kettle body; jackets are arranged on the periphery of the kettle body and are provided with a jacket outlet and a jacket inlet; a coil pipe is arranged in the kettle body; and the two ends of the coil pipe are respectively connected with the coil pipe outlet and the coil pipe inlet. The reaction kettle has the following beneficial effects that materials can be fully stirred when the liquid level in the kettle is low by adding the small auxiliary stirring paddle at the bottom of the kettle, thus ensuring the heat and mass transfer effects; and the vent extends into the kettle and vacuumizes the interior of the kettle during solid charging, thus preventing the solids from agglomeration as the solids become damp under the effect of acid mist.

Description

technical field [0001] The invention relates to the technical field of reaction vessels, in particular to a reaction kettle suitable for intermittent nitration of mixed acids. Background technique [0002] Nitric sulfur mixed acid is a commonly used nitrating agent with ideal effect, and it is widely used in many nitration reactions. [0003] Intermittent nitrification of mixed acids is mostly carried out in tank reactors, and there are two major disadvantages in using conventional reactors: when feeding solids, the acid mist in the tank may make the solids in the feeding port absorb moisture and stick to the feeding port, resulting in poor feeding; In the initial stage of acid mixing, the liquid level in the kettle is too low to submerge the stirring paddle, and the materials cannot be fully stirred. Taking the production of mononitrourea as an example, the operation process is as follows: drop fuming sulfuric acid into a reaction kettle equipped with fuming nitric acid at...

AI Technical Summary

Problems solved by technology

[0003] Intermittent nitrification of mixed acids is mostly carried out in tank reactors, and there are two major disadvantages in using conventional reactors: when feeding solids, the acid mist in the tank may make the solids in the feeding port absorb moisture and stick to the feeding port, resulting in poor feeding; In the initial stage of acid mixing, the liquid level in the kettle is too low to submerge the stirring paddle, and the materials cannot be fully stirred.

Therefore, there are certain potential safety hazards in the mixed acid nitration reaction using conventional reactors.

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