Ammonia neutralization device and neutralization method

Abstract

The invention relates to an ammonia neutralization device and method. The device and the method are mainly used for solving the problems in the prior art that the rate of removal of ammonia from reactant gases in an ammonia oxidation reaction is low, the ammonia enters a subsequent system, the polymer loss of organic matters is increased, the clogging to towers and pipelines is caused, and the operation cycle of equipment is shortened. According to the ammonia neutralization device and method, by adopting the technical scheme that the ammonia neutralization device comprises a shell, a reactant gas inlet, a reactant gas outlet, a reactant gas neutralizing solution inlet and a reactant gas neutralizing solution outlet, a tower plate or filler which is located below the reactant gas neutralizing solution inlet and above the reactant gas inlet is arranged in the ammonia neutralization device, a liquid distributor is arranged at the neutralizing solution inlet, and a reactant gas neutralizing solution is in counter-flow contact with the reactant gases, the problems are better solved, and thus the device and the method can be applied to an industrial unit for the ammonia oxidation reaction.

Description

technical field

[0001] The invention relates to an ammonia neutralization device and a neutralization method. Background technique

[0002] In the ammoxidation reaction device, the reaction gas at the outlet of the fluidized bed reactor contains unreacted ammonia, which must be removed as soon as possible, and the removal must be thorough, otherwise the ammonia entering the subsequent system will cause the pH value of the system to increase, resulting in increased product loss. It affects the recovery rate of the product, and also causes polymer blockage in towers, heat exchangers, pipelines, etc., affecting the normal operation of the device. At present, multi-layer spray layers are used to neutralize ammonia, the gas-liquid contact is insufficient, and the removal efficiency of ammonia is not high. The consumption has very important practical significance and economic benefits.

[0003] Document US3885928 has introduced a kind of recovery and refining system of alkenonit...

Examples

Embodiment 1

[0027] An ammonia neutralization device, 6 pieces of theoretical plate grid packing are arranged below the inlet of the reaction gas neutralization liquid and above the inlet of the reaction gas, the inlet of the reaction gas neutralization liquid is provided with a hole type liquid distributor, and the inlet of the reaction gas is provided with dendritic porous Type gas distributor, above the liquid distributor, set 2 theoretical bubble cap plates as demisters, after neutralization, the removal rate of ammonia in the reaction gas reaches 99.2%, and the ammonia neutralization device and subsequent systems are free from clogging. The heat exchange effect of the heat exchanger and the system resistance remain unchanged, the polymerization loss of organic matter is reduced, and the operating cycle of the device reaches 18 months, which prolongs the operating cycle of the device and achieves better technical results.

Embodiment 2

[0029]The ammonia neutralization device includes a shell, a reaction gas inlet and a reaction gas outlet, a reaction gas neutralization liquid inlet and a reaction gas neutralization liquid outlet, the reaction gas inlet is set at the lower part of the ammonia neutralization device, and the reaction gas outlet is set at the ammonia neutralization device At the top, the reaction gas neutralizing liquid inlet is arranged above the reaction gas inlet, and the neutralizing liquid outlet is arranged at the bottom of the ammonia neutralization device, wherein a tray or A liquid distributor is installed at the filler and neutralizing liquid inlet.

[0030] The number of theoretical plates of the trays or fillers arranged below the reaction gas neutralizing liquid inlet and above the reaction gas inlet is 10; the trays are bubble-cap trays; the fillers are grids; The liquid distributor provided at the liquid inlet is a trough-type liquid distributor; the number of theoretical plates o...

Embodiment 3

[0033] The ammonia neutralization device includes a shell, a reaction gas inlet and a reaction gas outlet, a reaction gas neutralization liquid inlet and a reaction gas neutralization liquid outlet, the reaction gas inlet is set at the lower part of the ammonia neutralization device, and the reaction gas outlet is set at the ammonia neutralization device At the top, the reaction gas neutralizing liquid inlet is arranged above the reaction gas inlet, and the neutralizing liquid outlet is arranged at the bottom of the ammonia neutralization device, wherein a tray or A liquid distributor is installed at the filler and neutralizing liquid inlet.

[0034] The number of theoretical plates of the trays or fillers arranged below the reaction gas neutralizing liquid inlet and above the reaction gas inlet is 10; the trays are bubble-cap trays; the fillers are grids; The liquid distributor provided at the liquid inlet is a trough-type liquid distributor; the number of theoretical plates ...

technical field

[0001] The invention relates to an ammonia neutralization device and a neutralization method. Background technique

[0002] In the ammoxidation reaction device, the reaction gas at the outlet of the fluidized bed reactor contains unreacted ammonia, which must be removed as soon as possible, and the removal must be thorough, otherwise the ammonia entering the subsequent system will cause the pH value of the system to increase, resulting in increased product loss. It affects the recovery rate of the product, and also causes polymer blockage in towers, heat exchangers, pipelines, etc., affecting the normal operation of the device. At present, multi-layer spray layers are used to neutralize ammonia, the gas-liquid contact is insufficient, and the removal efficiency of ammonia is not high. The consumption has very important practical significance and economic benefits.

[0003] Document US3885928 has introduced a kind of recovery and refining system of alkenonit...

Examples

Embodiment 1

[0027] An ammonia neutralization device, 6 pieces of theoretical plate grid packing are arranged below the inlet of the reaction gas neutralization liquid and above the inlet of the reaction gas, the inlet of the reaction gas neutralization liquid is provided with a hole type liquid distributor, and the inlet of the reaction gas is provided with dendritic porous Type gas distributor, above the liquid distributor, set 2 theoretical bubble cap plates as demisters, after neutralization, the removal rate of ammonia in the reaction gas reaches 99.2%, and the ammonia neutralization device and subsequent systems are free from clogging. The heat exchange effect of the heat exchanger and the system resistance remain unchanged, the polymerization loss of organic matter is reduced, and the operating cycle of the device reaches 18 months, which prolongs the operating cycle of the device and achieves better technical results.

Embodiment 2

[0029]The ammonia neutralization device includes a shell, a reaction gas inlet and a reaction gas outlet, a reaction gas neutralization liquid inlet and a reaction gas neutralization liquid outlet, the reaction gas inlet is set at the lower part of the ammonia neutralization device, and the reaction gas outlet is set at the ammonia neutralization device At the top, the reaction gas neutralizing liquid inlet is arranged above the reaction gas inlet, and the neutralizing liquid outlet is arranged at the bottom of the ammonia neutralization device, wherein a tray or A liquid distributor is installed at the filler and neutralizing liquid inlet.

[0030] The number of theoretical plates of the trays or fillers arranged below the reaction gas neutralizing liquid inlet and above the reaction gas inlet is 10; the trays are bubble-cap trays; the fillers are grids; The liquid distributor provided at the liquid inlet is a trough-type liquid distributor; the number of theoretical plates o...

Embodiment 3

[0033] The ammonia neutralization device includes a shell, a reaction gas inlet and a reaction gas outlet, a reaction gas neutralization liquid inlet and a reaction gas neutralization liquid outlet, the reaction gas inlet is set at the lower part of the ammonia neutralization device, and the reaction gas outlet is set at the ammonia neutralization device At the top, the reaction gas neutralizing liquid inlet is arranged above the reaction gas inlet, and the neutralizing liquid outlet is arranged at the bottom of the ammonia neutralization device, wherein a tray or A liquid distributor is installed at the filler and neutralizing liquid inlet.

[0034] The number of theoretical plates of the trays or fillers arranged below the reaction gas neutralizing liquid inlet and above the reaction gas inlet is 10; the trays are bubble-cap trays; the fillers are grids; The liquid distributor provided at the liquid inlet is a trough-type liquid distributor; the number of theoretical plates ...

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