Method and device for fully automatically and continuously producing methyl nitrite

A methyl nitrite, fully automated technology, used in the preparation of nitrite, chemical instruments and methods, separation methods, etc., can solve problems such as temperature and pressure increase, reaction runaway, easy decomposition, etc., to achieve good economy, easy to use. effect of operation

Active Publication Date: 2022-07-29
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Methyl nitrite is unstable and easy to decompose, and there is a danger of combustion and explosion when exposed to heat sources and open flames
And high concentrations of met

Method used

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  • Method and device for fully automatically and continuously producing methyl nitrite

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Effect test

Embodiment 1

[0121] The device of the present invention consists of 1 and 2 pneumatic diaphragm pumps, 3. mixed raw material storage tank, 4. acid storage tank, 5. reaction kettle, 6. liquid contact tank, 7. reflux condenser, 8. sedimentation tank, 9. molecular sieve Dryer, 10. silica gel filter, 11 and 12. gas storage tank and other equipment and pipelines.

[0122] Wherein the pneumatic diaphragm pump 1 is connected with the mixing raw material tank 3, the mixing raw material tank 3 is connected with the reaction kettle 5 through the flow control unit, the pneumatic diaphragm pump 2 is connected with the acid storage tank 4, and the nitric acid storage tank 4 is connected with the reaction kettle 5 through the flow control unit . The reaction kettle 5 is connected to the liquid contact tank 6 . The reaction kettle 5 is connected through the reflux condenser 7 , the sedimentation tank 8 , the molecular sieve dryer 9 , the silica gel filter 10 , the gas storage tank 11 and the gas storage...

Embodiment 2

[0129] The method utilizing device of the present invention to produce methyl nitrite is:

[0130] 1. Seal the reaction kettle, pass nitrogen and vacuumize for three times;

[0131] 2. Prepare the mixed solution of sodium nitrite and methanol in advance and put it in the raw material barrel;

[0132] 3. Prepare the concentrated nitric acid solution in advance and put it in the raw material barrel;

[0133] 4. Pump acid and mixed solution into mixed raw material tank and acid tank through pneumatic diaphragm pump, and adjust nitrogen pressure in raw material storage tank so that nitrogen pressure is not lower than 0.5MPa;

[0134] 5. Open the pneumatic switch valve, let the mixed raw materials enter the reactor, add 50% of the liquid level of the reactor, and the temperature of the reactor is 20 °C;

[0135] 6. Open the pneumatic switch valve, so that the acid in the acid tank is slowly added to the reaction kettle, and the sodium nitrite and methanol react to generate methyl...

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Abstract

The invention discloses a method and a device for fully automatically and continuously producing methyl nitrite. According to the method for continuously producing methyl nitrite, the liquid level, the temperature and the pressure in a reaction kettle are detected, and the detected liquid level value, the detected temperature value and the detected pressure value are remotely transmitted to a control unit; the control unit sends execution commands to valves in a pipeline between the raw material tank or the acid storage tank and the reaction kettle and a pipeline between the reaction kettle and the waste liquid tank according to preset conditions, and continuous reaction in the reaction kettle is realized by controlling the flow of a mixed solution of sodium nitrite and methanol and the flow of an acid solution. According to the method, through an automatic control system which comprises a detection unit, a control unit and an execution unit, the conventional intermittent operation concept is broken through, and automatic and continuous production of the methyl nitrite gas is achieved.

Description

technical field [0001] The invention relates to a fully automated method and device for continuous production of methyl nitrite, belonging to the field of chemical industry. Background technique [0002] Methyl nitrite is an important intermediate product in coal chemical industry, biomedicine and organic synthesis. In the field of coal chemical industry, it can be used for the synthesis of ester chemicals, such as the catalytic coupling of methyl nitrite and carbon monoxide to synthesize dimethyl oxalate, the esterification of carbon monoxide to synthesize dimethyl carbonate, and the synthesis of methyl formate, etc. technology. Ensuring the continuous and stable supply of methyl nitrite is the key to the stable operation of the whole process. [0003] Methyl nitrite is generally prepared by reacting methanol and sodium nitrite in the presence of an acid (such as concentrated sulfuric acid); it can also be obtained by oxidative esterification of nitric oxide. For the sec...

Claims

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Application Information

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IPC IPC(8): C07C201/04C07C203/00B01J19/18B01J19/00B01J4/02B01J4/00B01D53/26B01D53/04B01D45/02
CPCC07C201/04B01J19/18B01J19/00B01J19/0006B01J4/02B01J4/001B01D53/04B01D53/26B01D45/02B01D2253/106B01D2253/108B01D2253/116C07C203/00
Inventor 孙径郭国聪徐忠宁杨智健刁剑锋
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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