Methanol ammonoxidation explosion-proof yield increasing method

Abstract

The invention relates to a methanol ammonia oxidation explosion-prevention increase-production method which prevents mixed gas containing methanol vapor, ammonia gas and air from exploding and enhances the productive efficiency of methanol ammonia oxidation. Aiming at defects of low productive efficiency, high cost and more serious security hidden trouble in the prior technics in which the methanol vapor, the ammonia gas and the air are materials and methanol ammonia is catalyzed by fe-mo oxides and is oxidated, the methanol ammonia oxidation explosion-prevention increase-production method which has high productive efficiency, low cost and no easiness to form explosive mixed gas in the above-mentioned method. The invention has the key points that inhibitory explosion gas is added to restrain explosion, the methanol vapor, the ammonia gas and the air which are all combustible gas are heated in a separated way, mixed gas is ensured to flow downwards so that the explosion is not easy to happen in this way, etc. The above-mentioned method ensures the mixed gas materials to be the explosive mixed gas. The methanol concentration and the ammonia concentration are enhanced in the mixed gas, the throughput is greatly enhanced and the production cost is reduced.

Description

technical field

[0001] The invention belongs to the technical field of methanol ammoxidation, in particular to a methanol ammoxidation process that uses iron / molybdenum oxide to catalyze methanol ammoxidation to prevent the explosion of methanol vapor, ammonia gas and air mixed gas and improve the production efficiency of methanol ammoxidation Explosion-proof production increase method for ammonia oxidation. Background technique

[0002] The existing process uses methanol, ammonia and air as raw materials, and uses iron / molybdenum oxide to catalyze the ammoxidation of methanol. The preheated methanol vapor sucked by the inner suction pipe enters the shell side of the shell-tube heat exchanger to be heated, and then enters the shell-tube fixed-bed catalytic reactor filled with iron / molybdenum oxide catalyst, part of the heat of reaction is obtained by the tube The external medium is removed, and the high-temperature mixed gas after the reaction recovers heat through the tube...

Examples

Embodiment 1

[0016] Referring to accompanying drawing 1, a kind of methanol ammoxidation explosion-proof increase production method in the process that uses iron / molybdenum oxide to catalyze methanol ammoxidation. It is used in new production systems that use methanol, ammonia and air as raw materials and use iron / molybdenum oxides to catalyze the ammoxidation of methanol.

[0017] Nitrogen is used as the explosion suppression gas in the methanol ammoxidation process; the heat exchanger adopts a two-stage shell and tube heat exchanger 1, so that the flammable gas methanol vapor and ammonia are heated separately from the air; the air, methanol and ammonia are heated The top of the fixed-bed catalytic reactor 3 is mixed, and the mixed gas is in a downward flow direction that is not conducive to explosion. The gas distribution process index of raw material mixed gas is: nitrogen 20-25%, methanol 7-8%, ammonia 7.7-8.8%, air 58.2-65.3%. The equipment and pipelines are designed according to ≥0....

Embodiment 2

[0020] Referring to accompanying drawing 2, a kind of methanol ammoxidation explosion-proof increase production method in the process of using iron / molybdenum oxide to catalyze methanol ammoxidation. It is used in new production systems that use methanol, ammonia and air as raw materials and use iron / molybdenum oxides to catalyze the ammoxidation of methanol.

[0021] Nitrogen is used as the explosion suppression gas in the methanol ammoxidation process; the heat exchanger uses two tube-and-tube heat exchangers to separate the flammable gas methanol vapor and ammonia from the air; the air, methanol and ammonia are fixed The top of the bed catalytic reactor 11 is mixed, and the mixed gas is in a downward flow direction which is not conducive to explosion. The gas distribution process index of raw material mixed gas is: nitrogen 20-25%, methanol 7-8%, ammonia 7.7-8.8%, air 58.2-65.3%. The equipment and pipelines are designed according to ≥0.6Mpa, and the piping is designed acco...

Embodiment 3

[0024] Referring to accompanying drawing 1, a kind of methanol ammoxidation explosion-proof increase production method in the process that uses iron / molybdenum oxide to catalyze methanol ammoxidation. It is used in new production systems that use methanol, ammonia and air as raw materials and use iron / molybdenum oxides to catalyze the ammoxidation of methanol.

[0025] Adding water vapor is used as explosion suppression gas in methanol ammoxidation process; the heat exchanger adopts two-stage tube heat exchanger 1 to separate the flammable gas methanol vapor and ammonia from air; the air, methanol and ammonia Mix at the top of the fixed-bed catalytic reactor 3, and make the mixed gas in a downward flow direction that is not conducive to explosion. The gas distribution process index of raw material mixed gas is: water vapor 16-21%, methanol 7-8%, ammonia 7.7-8.8%, air 62.2-69.3%. The equipment and pipelines are designed according to ≥0.6Mpa, and the piping is designed accordin...

technical field

[0001] The invention belongs to the technical field of methanol ammoxidation, in particular to a methanol ammoxidation process that uses iron / molybdenum oxide to catalyze methanol ammoxidation to prevent the explosion of methanol vapor, ammonia gas and air mixed gas and improve the production efficiency of methanol ammoxidation Explosion-proof production increase method for ammonia oxidation. Background technique

[0002] The existing process uses methanol, ammonia and air as raw materials, and uses iron / molybdenum oxide to catalyze the ammoxidation of methanol. The preheated methanol vapor sucked by the inner suction pipe enters the shell side of the shell-tube heat exchanger to be heated, and then enters the shell-tube fixed-bed catalytic reactor filled with iron / molybdenum oxide catalyst, part of the heat of reaction is obtained by the tube The external medium is removed, and the high-temperature mixed gas after the reaction recovers heat through the tube...

Examples

Embodiment 1

[0016] Referring to accompanying drawing 1, a kind of methanol ammoxidation explosion-proof increase production method in the process that uses iron / molybdenum oxide to catalyze methanol ammoxidation. It is used in new production systems that use methanol, ammonia and air as raw materials and use iron / molybdenum oxides to catalyze the ammoxidation of methanol.

[0017] Nitrogen is used as the explosion suppression gas in the methanol ammoxidation process; the heat exchanger adopts a two-stage shell and tube heat exchanger 1, so that the flammable gas methanol vapor and ammonia are heated separately from the air; the air, methanol and ammonia are heated The top of the fixed-bed catalytic reactor 3 is mixed, and the mixed gas is in a downward flow direction that is not conducive to explosion. The gas distribution process index of raw material mixed gas is: nitrogen 20-25%, methanol 7-8%, ammonia 7.7-8.8%, air 58.2-65.3%. The equipment and pipelines are designed according to ≥0....

Embodiment 2

[0020] Referring to accompanying drawing 2, a kind of methanol ammoxidation explosion-proof increase production method in the process of using iron / molybdenum oxide to catalyze methanol ammoxidation. It is used in new production systems that use methanol, ammonia and air as raw materials and use iron / molybdenum oxides to catalyze the ammoxidation of methanol.

[0021] Nitrogen is used as the explosion suppression gas in the methanol ammoxidation process; the heat exchanger uses two tube-and-tube heat exchangers to separate the flammable gas methanol vapor and ammonia from the air; the air, methanol and ammonia are fixed The top of the bed catalytic reactor 11 is mixed, and the mixed gas is in a downward flow direction which is not conducive to explosion. The gas distribution process index of raw material mixed gas is: nitrogen 20-25%, methanol 7-8%, ammonia 7.7-8.8%, air 58.2-65.3%. The equipment and pipelines are designed according to ≥0.6Mpa, and the piping is designed acco...

Embodiment 3

[0024] Referring to accompanying drawing 1, a kind of methanol ammoxidation explosion-proof increase production method in the process that uses iron / molybdenum oxide to catalyze methanol ammoxidation. It is used in new production systems that use methanol, ammonia and air as raw materials and use iron / molybdenum oxides to catalyze the ammoxidation of methanol.

[0025] Adding water vapor is used as explosion suppression gas in methanol ammoxidation process; the heat exchanger adopts two-stage tube heat exchanger 1 to separate the flammable gas methanol vapor and ammonia from air; the air, methanol and ammonia Mix at the top of the fixed-bed catalytic reactor 3, and make the mixed gas in a downward flow direction that is not conducive to explosion. The gas distribution process index of raw material mixed gas is: water vapor 16-21%, methanol 7-8%, ammonia 7.7-8.8%, air 62.2-69.3%. The equipment and pipelines are designed according to ≥0.6Mpa, and the piping is designed accordin...

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