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System and method for preventing burning explosion in methyl nitrite preparation process

A technology of methyl nitrite and preparation process is applied in the field of systems for preventing combustion and explosion, and achieves the effects of preventing combustion and explosion, ensuring mixing and ensuring safety

Pending Publication Date: 2020-12-01
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it cannot be completely ruled out that static electricity and sparks will be caused in the mixing area due to external accidental factors, resulting in local combustion points with high oxygen concentration, and spreading flames along the mixing contact surface of combustibles and oxygen.

Method used

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  • System and method for preventing burning explosion in methyl nitrite preparation process

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Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, a system for preventing explosion during the preparation of methyl nitrite, including a mixer 1, a front flame arrester 2, a rear flame arrester 3, a safety valve 4, a bursting membrane 5, a liquid inlet 6, and a gas outlet 7 , gas cooler 8, nitrosation reaction raw material gas inlet 9, CO inlet 10, liquid extraction outlet 11, circulation pump 12, first valve 13, second valve 14, third valve 15 and decompression storage tank 16.

[0035] NO circulating gas a (temperature 60°C, pressure 5bar, volume flow 55000m 3 / h, the main components are nitrogen 60%, NO18%, methanol 12%, CO7%, etc.) enter the mixer 1 through the pre-flame arrester 2, and mix with the oxygen b entering the mixer 1 through the oxygen distributor, and the oxygen b ( Temperature 25℃, pressure 5bar, volume flow 1200m 3 / h) Enter the central main pipe of the oxygen distributor in the mixer 1 through the first valve 13, and then enter a total of 11 branch pipes connected to th...

Embodiment 2

[0041] A system for preventing explosion during the preparation of methyl nitrite, including mixer 1, pre-flame arrester 2, post-flame arrester 3, safety valve 4, bursting membrane 5, liquid inlet 6, gas outlet 7, and gas cooling device 8, nitrosation reaction raw material gas inlet 9, CO inlet 10, liquid extraction outlet 11, circulation pump 12, first valve 13, second valve 14, third valve 15 and decompression storage tank 16.

[0042] The liquid inlet 6 and the gas outlet 7 are arranged at the top of the nitrosation reaction tower, and the gas outlet 7 is connected to the gas cooler 8; The outlet 11 is connected back to the nitrosation reaction tower through a circulation pipeline, and a circulation pump 12 is arranged on the circulation pipeline.

[0043] The pre-flame arrester 2 adopts a gap-type deflagration-resistant flame arrester, and two layers of fire-retardant layers are connected in series. The maximum test safety gap (MESG) value of the fire-retardant layer near ...

Embodiment 3

[0049] A system for preventing explosion during the preparation of methyl nitrite, including mixer 1, pre-flame arrester 2, post-flame arrester 3, safety valve 4, bursting membrane 5, liquid inlet 6, gas outlet 7, and gas cooling device 8, nitrosation reaction raw material gas inlet 9, CO inlet 10, liquid extraction outlet 11, circulation pump 12, first valve 13, second valve 14, third valve 15 and decompression storage tank 16.

[0050] The liquid inlet 6 and the gas outlet 7 are arranged on the top of the nitrosation reaction tower, and the gas outlet 7 is connected to the gas cooler 8; The outlet 11 is connected back to the nitrosation reaction tower through a circulation pipeline, and a circulation pump 12 is arranged on the circulation pipeline.

[0051]The pre-flame arrester 2 adopts a gap-type deflagration-resistant flame arrester, and two layers of fire-retardant layers are connected in series. The maximum test safety gap (MESG) value of the fire-resistant layer near t...

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Abstract

The invention relates to a system and a method for preventing burning explosion in a methyl nitrite preparation process. The system comprises a safety mixing subsystem and a nitrosation reaction tower, the upper part of the nitrosation reaction tower is provided with a methanol inlet (6), the lower part of the nitrosation reaction tower is provided with a reaction feed gas inlet (9), and the safety mixing subsystem is connected with the feed gas inlet (9). Compared with like systems and methods in the prior art, the system and the method of the invention have the advantages of higher safety, capability of ensuring that oxygen and NO recycle gas can be safely, quickly and fully mixed, stable temperature in the nitrosation reaction tower and the like.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a system and method for preventing explosion during the preparation of methyl nitrite. Background technique [0002] The technical route of producing ethylene glycol by gas-phase reaction of synthesis gas has good economy and competitiveness. The process is mainly divided into three steps of nitrosation, coupling and hydrogenation: the first step of nitrosation is to use nitrogen monoxide, oxygen and methanol as raw materials to generate methyl nitrite (MN); the second step of coupling is to Carbon monoxide and MN are used as raw materials to generate dimethyl oxalate (DMO); the third step of hydrogenation is to use hydrogen and DMO as raw materials to generate ethylene glycol. Patent CN 101190884 B discloses a process for carrying out nitrosation and coupling processes in a nitrosation reactor and a coupling reactor, and is generally adopted in the industry. Patent...

Claims

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Application Information

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IPC IPC(8): C07C201/04C07C203/00B01F3/02B01F15/00B01F15/02B01F23/10
CPCC07C201/04B01F23/10B01F2035/35B01F35/2113B01F35/00B01F35/2115B01F35/2215B01F35/718051C07C203/00
Inventor 阎建民肖文德李学刚罗漫
Owner SHANGHAI JIAO TONG UNIV
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