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A method for comprehensive utilization of tail gas in the production of nitromethane by nitrite replacement method

A technology of nitromethane and nitrite, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of high cost, limited treatment effect, low efficiency of tail gas absorption, etc., and achieve low efficiency, The effect of high governance cost and improved utilization efficiency

Active Publication Date: 2022-02-22
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for comprehensive utilization of tail gas produced by nitromethane by nitrite replacement method, which solves the problem in the prior art that the tail gas absorption efficiency and high cost of nitromethane produced by nitrite replacement method are limited in its treatment effect question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A tail gas comprehensive utilization method for producing nitromethane by a nitrite replacement method of the present invention comprises the following steps:

[0035] 1) The tail gas produced by the nitrite replacement method is passed into ethanol, and the tail gas flow rate is 50 L / min. After testing, the tail gas includes the following gas in volume percentage: 75% of methyl nitrite gas, a Nitrogen oxide 10% and nitrogen dioxide 15%, the control stirring speed is 200r / min, stir, obtain the ethanol solution of methyl nitrite; The absorption rate of ester is 92%;

[0036] 2) Get ethyl acetoacetate, 95% ethanol solution and catalyzer, mix, make reaction solution, standby; Catalyst is p-phenylmethanesulfonic acid, and the consumption of catalyzer is 5% of ethyl acetoacetate weight, 95% ethanol solution Consumption is 5% of ethyl acetoacetate weight;

[0037] 3) Pass the ethanol solution of methyl nitrite obtained in step 1) into the reaction solution obtained in step ...

Embodiment 2

[0039] A tail gas comprehensive utilization method for producing nitromethane by a nitrite replacement method of the present invention comprises the following steps:

[0040] 1) The tail gas produced by the nitrite replacement method is passed into ethanol, and the tail gas flow rate is 0.01 L / min. After testing, the tail gas includes the following gas in volume percentage: 85% of methyl nitrite gas, a Nitrogen oxide 5% and nitrogen dioxide 10%, the absorption temperature is 30°C, the stirring speed is controlled to be 300r / min, and stirred to obtain an ethanol solution of methyl nitrite; the absorbed tail gas is passed into the sodium hydroxide solution; after testing, Obtain the absorption rate of ethanol to methyl nitrite 95%;

[0041] 2) get ethyl acetoacetate and catalyst, mix, make reaction solution, standby; Catalyst is formic acid, and the consumption of catalyst is 5% of ethyl acetoacetate weight;

[0042] 3) Pass the ethanol solution of methyl nitrite obtained in st...

Embodiment 3

[0044] A tail gas comprehensive utilization method for producing nitromethane by a nitrite replacement method of the present invention comprises the following steps:

[0045] 1) Pass the tail gas produced by the nitrite replacement method into methanol, the tail gas flow rate is 25 L / min, the stirring speed is controlled to be 300r / min, the absorption temperature is -10°C, and stirring is carried out to obtain methyl nitrite Methanol solution; the tail gas absorbed is passed into the sodium hydroxide solution; after testing, the absorption rate of methanol to methyl nitrite is 93%;

[0046] 2) Get ethyl acetoacetate, 95% methanol solution and catalyst, mix, make reaction solution, standby; Catalyst is acetic acid, and the consumption of catalyst is 5% of ethyl acetoacetate weight, and the consumption of 95% methanol solution is acetyl 15% by weight of ethyl acetate;

[0047] 3) Pass the methanol solution of methyl nitrite obtained in step 1) into the reaction solution obtaine...

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Abstract

The invention discloses a tail gas comprehensive utilization method for producing nitromethane by a nitrite replacement method, and belongs to the technical field of tail gas recovery and reuse. The invention comprises the following steps: 1) passing the tail gas produced by the nitrite replacement method into the alcohol and stirring to obtain an alcohol solution of methyl nitrite; 2) taking ethyl acetoacetate, alcohol and a catalyst, and mixing them to prepare 3) the alcohol solution of methyl nitrite obtained in step 1) is passed into the reaction solution obtained in step 2), stirred, and reacted for 4 to 8 hours at 5 to 15°C to obtain 2-Nitrite Ethyl nitroacetoacetate. In the present invention, the absorption efficiency of methyl nitrite is high, and the absorption liquid is directly applied to the production of ethyl 2-nitrosoacetoacetate. As an important intermediate in the production of aminothioxamic acid, it is widely used in the pharmaceutical industry, which not only realizes the collection of tail gas , and the utilization efficiency of the absorption liquid is extremely high, avoiding resource waste, low cost, and realizing high-efficiency co-production.

Description

technical field [0001] The invention belongs to the technical field of tail gas recovery and reuse, in particular to a tail gas comprehensive utilization method for producing nitromethane by a nitrite replacement method. Background technique [0002] Nitromethane is a colorless, transparent, oily liquid with aroma and certain volatility, with a boiling point of 101.2°C, partially miscible with water, and soluble in organic solvents such as ethanol, ether, and dimethylformamide. Nitromethane is widely used in chemical production. It is often used to prepare bronopol, as a preservative for cosmetics and detergents, and can also be used to synthesize pesticide chloropicrin. It can also be used as liquid explosives and fuel propellants. At the same time, nitromethane Methyl methane is also a widely used organic solvent. [0003] At present, the main production method of nitromethane in the world is the nitrite replacement method, specifically the replacement method of dimethyl ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C207/00C07C201/00
Inventor 谢传欣翟皓宇王少猛程绚莺陈佃昆
Owner QINGDAO UNIV OF SCI & TECH
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