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Reactor and method for continuously producing nitromethane

A nitromethane and reactor technology, applied in the field of reactors for continuous production of nitromethane, can solve the problems of low product purity, low yield, and easy side reactions

Pending Publication Date: 2018-03-30
BEIJING CHEM REACTION ENG SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a reactor and method for continuous production of nitromethane aiming at the technical shortcomings of strong exothermic effect in the dimethyl sulfate substitution method, which leads to easy occurrence of side reactions, low product purity and low yield.

Method used

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  • Reactor and method for continuously producing nitromethane
  • Reactor and method for continuously producing nitromethane

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Experimental program
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Effect test

Embodiment 1

[0030] Sodium nitrite aqueous solution is fed continuously through the inlet 2, and dimethyl sulfate is injected into the mixing chamber 5 through the inlet 3 of the reaction zone 1 through the mixed flow nozzle 4 and mixed with the sodium nitrite solution (feed section n=1) , the molar ratio of dimethyl sulfate and sodium nitrite is 2:1. The two materials are mixed quickly and evenly in the mixing chamber under the action of the mixed-flow nozzle, and then enter the reaction tube connected to the 6-phase for efficient reaction. During the reaction, the circulation of the cooling water is realized through the heat transfer medium inlet 16 and the heat transfer medium outlet 17, and the reaction heat generated by the reaction is removed, so that the reaction solution is continuously incubated at 60°C. After the reaction, the reaction product is continuously transported to the subsequent separation workshop through the outlet 7 for refining and purification to obtain the nitrome...

Embodiment 2

[0032] Sodium nitrite aqueous solution is passed into continuously through inlet 2, and the dimethyl sulfate of 50% quality passes through the inlet 3 of reaction zone one and sprays into mixing chamber 5 and mixes with sodium nitrite solution through mixing nozzle 4 (feed section n=2), the molar ratio of dimethyl sulfate total amount and sodium nitrite is 2:1. The two materials are mixed quickly and evenly in the mixing chamber under the action of the mixed-flow nozzle, and then enter the reaction tube connected to the 6-phase for efficient reaction. Then reaction solution leaves reaction zone one by outlet 7, and enters reaction zone two by inlet 8, carries out rapid mixing with the dimethyl sulfate (50% quality) that comes from inlet 3 and injects through mixing nozzle 4 in mixing chamber 5, then Enter the reaction tube connected with 6 phases for high-efficiency reaction. During the reaction, the heat transfer medium inlet 16 and the heat transfer medium outlet 17 of the ...

Embodiment 3

[0034]Sodium nitrite aqueous solution is passed into continuously by inlet 2, and the dimethyl sulfate of 30% quality passes through the inlet 3 of reaction zone one and sprays into mixing chamber 5 and mixes with sodium nitrite solution through mixed flow nozzle 4 (feed section n=3), the molar ratio of dimethyl sulfate total amount and sodium nitrite is 2:1. The two materials are mixed quickly and evenly in the mixing chamber under the action of the mixed-flow nozzle, and then enter the reaction tube connected to the 6-phase for efficient reaction. Then reaction solution leaves reaction zone one by outlet 7, and enters reaction zone two by inlet 8, carries out rapid mixing with the dimethyl sulfate (30% quality) that comes from inlet 3 and sprays into through mixing nozzle 4 in mixing chamber 5, then Enter the reaction tube connected with 6 phases for high-efficiency reaction. Then reaction solution leaves reaction zone two through outlet 9, and enters reaction zone three by...

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Abstract

The invention provides a reactor for continuously producing nitromethane. The reactor comprises n reaction zones which are connected in series, wherein the reaction zone 1 comprises a shell, a mixingchamber arranged in the shell and a reaction tube connected with the mixing chamber, and the shell is provided with a sodium nitrite inlet and a dimethyl sulfate inlet which are connected with the mixing chamber, a reaction product outlet connected with the reaction tube, a heat transfer medium inlet and a heat transfer medium outlet; each of the reaction zone 2 to the nth reaction zone comprisesa shell, a mixing chamber arranged in the shell and a reaction tube connected to the mixing chamber, and the shell is provided with a previous reaction zone reaction product inlet and a dimethyl sulfate inlet which are connected with the mixing chamber, a reaction product outlet connected with the reaction tube, a heat transfer medium inlet and a heat transfer medium outlet; and the reaction product outlets of the reaction zones except the last reaction zone are connected with the reaction product inlets of the next reaction zones through pipelines.

Description

technical field [0001] The invention relates to a reactor and method for continuous production of nitromethane. Background technique [0002] Nitromethane is the simplest aliphatic nitro compound. The hydrogen on the methyl group is quite active due to the influence of the nitro group, so it has a wide range of applications in the field of fine chemicals. In recent years, the market demand has increased and the export volume has increased year by year. At present, there are two main methods for domestic production of nitromethane: one is the methane gas-phase nitration method, in which nitric acid is gasified and mixed with methane (natural gas) in proportion, and directly nitrated in the reactor under normal pressure of 450-550°C. After condensation, absorption, rough distillation, and rectification, the finished product is obtained; another method is the nitroso substitution method of dimethyl sulfate: it is obtained through substitution of dimethyl sulfate and sodium ni...

Claims

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Application Information

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IPC IPC(8): C07C205/02C07C201/10B01J19/24
CPCB01J19/245C07C201/10C07C205/02
Inventor 王金福唐强靳辉任立军丰秀珍姜顺波
Owner BEIJING CHEM REACTION ENG SCI & TECH CO LTD
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