Double-kettle type continuous nitration reaction device

Abstract

The invention relates to a double-kettle type continuous nitration reaction device. The double-kettle type continuous nitration reaction device is characterized by comprising a nitric acid feed pump and a concentrated sulfuric acid feed pump, wherein the nitric acid feed pump is connected to a nitric acid feed pump; a flowmeter is arranged on the nitric acid feed pipe; the other end of the nitric acid feed pipe is connected to a primary reaction kettle; a spray head is arranged in the primary reaction kettle; the spray head is connected with the other end of the nitric acid feed pipe; the concentrated sulfuric acid feed pump is connected to the primary reaction kettle through the concentrated sulfuric acid feed pipe; a primary jacket is arranged outside the primary reaction kettle; the primary jacket is connected to a primary cooling water inlet and a primary cooling water outlet; the lower part of the primary reaction kettle is connected to a primary U-shaped bend pipe; the other end of the primary U-shaped bend pipe is connected to a secondary reaction kettle; the height of a nitric acid inlet of the secondary reaction kettle is lower than that of a nitric acid inlet of the primary reaction kettle; a secondary jacket is arranged outside the secondary reaction kettle; the secondary jacket is connected to a secondary cooling water inlet and a secondary cooling water outlet; the lower part of the secondary reaction kettle is connected to a secondary U-shaped bend pipe; and the secondary U-shaped bend pipe is connected to a discharge pipe.

Description

technical field [0001] The invention relates to a nitration reaction device, in particular to a double-tank continuous nitration reaction device. Background technique [0002] Nitrification is a common chemical unit operation widely used in pesticides, medicines and dyes. For the single-pot nitration reaction used in the past, the reaction efficiency is low and the product yield is low. The nitration reaction itself will generate a lot of heat. If the control is not good, there will be a risk of explosion. The existing single-pot nitration reaction device usually adopts adding coils in the kettle or installing an external circulating condenser. Although this can reduce the heat, but However, the nitrification reaction cannot be carried out continuously, which will affect the production capacity and reaction efficiency of the nitrification reaction device, and the energy consumption is relatively high. Contents of the invention [0003] The purpose of the present inventio...

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Problems solved by technology

For the single-pot nitration reaction used in the past, the reaction efficiency is low and the product yield is low

The nitration reaction itself will generate a lot of heat. If the control is not good, there will be a risk of explosion. The existing single-pot nitration reaction device usually adopts adding coils in the kettle or installing an external circulating condenser. Although this can reduce the heat, but However, the nitrification reaction cannot be carried out continuously, which will affect the production capacity and reaction efficiency of the nitrification reaction device, and the energy consumption is relatively high

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