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Nitric acid purification device and process for treating bottom solution of mn regeneration tower

A purification device and regeneration tower technology, applied in the chemical field, can solve problems such as uneven mixing reaction, high equipment investment, and large floor area, and achieve significant energy saving and emission reduction effects, high reaction efficiency, and small floor area.

Active Publication Date: 2018-10-30
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking an ethylene glycol plant with an annual output of 200,000 tons as an example, the best-running nitric acid supply plant needs to supply 6-10m 3 / h nitric acid absorption liquid (mass concentration is about 5-10%, the same below), while the concentration of nitric acid in the discharge liquid reaches 0.7wt%-1wt%, which needs to be neutralized with lye, which is a serious waste and causes environmental protection treatment pressure and disposal Increased costs
On the other hand, due to the need for sufficient reaction residence time in the reactor, it is necessary to use more than 3 reactors with a capacity of 30-100m 3 The reaction kettle is completed together, resulting in a large footprint, low space utilization, high equipment investment, and unstable control
Moreover, the amplification effect of the large-volume reactor is obvious, and the mixing reaction is not uniform, which all lead to the inefficiency and high emission of the current supply purification device

Method used

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  • Nitric acid purification device and process for treating bottom solution of mn regeneration tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] In a chemical company with a capacity of 200,000 tons / year of coal-to-ethylene glycol, the concentration of nitric acid in the solution at the bottom of the MN regeneration tower is 7wt%, and the rest of the components consist of 52wt% methanol, H 2 O37wt%, DMC (dimethyl carbonate), MN (methyl nitrite) and MF (methyl formate) total 4wt%.

[0060] The height of the tower body 110 of the nitric acid purification device 10 is 1.6 meters. The circulation absorption section 1 includes two sections of 5m structured packing, and a liquid collector 6 is arranged below the liquid collector 6. A 16-layer large liquid holding capacity reaction distillation tower is arranged below the liquid collector 6. Purification section 2 of the plate. Below the purification section 2, a section of 4m catalyst fixed bed is arranged.

[0061] MN regeneration tower bottom solution at 10m 3 The flow rate of / h enters the tower body 110 from the first liquid inlet 114, and is collected by the li...

Embodiment 2

[0064] In a chemical company with a capacity of 300,000 tons / year of coal-to-ethylene glycol, the concentration of nitric acid in the solution at the bottom of the MN regeneration tower is 5.8wt%, and the rest of the components consist of 57wt% methanol, H 2 O34wt%, DMC (dimethyl carbonate), MN (methyl nitrite) and MF (methyl formate) totaled 3.2wt%.

[0065] The height of the tower body 110 of the nitric acid purification device 10 is 2 meters, the circulation absorption section 1 includes an upper section and a lower section, the upper section includes 6 layers of trays, and the lower section includes 4m structured packing, and a liquid collector 6 is arranged below the circulation absorption section 1 A purification section 2 comprising 20 layers of large liquid holdup reactive distillation trays is set below the liquid collector 6 . A catalytic decomposition section 3 is provided below the purification section 2, and the catalytic decomposition section 3 includes 8 layers ...

Embodiment 3

[0070] In a chemical company with 50,000 tons / year coal-to-ethylene glycol company, the concentration of nitric acid in the solution at the bottom of the MN regeneration tower is 0.7wt%, and the remaining components are composed of methanol 70wt%, H 2 O19.5wt%, DMC (dimethyl carbonate), MN (methyl nitrite) and MF (methyl formate) total 9.8wt%.

[0071] The height of the tower body 110 of the nitric acid purification device 10 is 1 meter, and the nitric acid purification device 10 includes a purification section 2 and a catalytic decomposition section 3 . The purification section 2 includes 24 layers of large liquid holding capacity reactive distillation trays, and the catalytic decomposition section 3 is arranged below the purification section 2, and the catalytic decomposition section 3 includes a 4m packing layer filled with catalyst.

[0072] The solution at the bottom of the MN regeneration tower containing nitric acid is 12m 3 The flow rate of / h enters the tray of purif...

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Abstract

The invention discloses a nitric acid purification device and process for treating MN regeneration tower bottom solution. The nitric acid purification device for treating MN regeneration tower bottom solution comprises a tower body, a purification section and a catalytic decomposition section, wherein a first air inlet, an air outlet, a first liquid inlet and a liquid outlet are formed in the tower body; the purification section is arranged in the tower body and comprises multiple layers of first tower plates; the purification section is positioned above the first air inlet and the liquid outlet and below the first liquid inlet and the air outlet; the catalytic decomposition section is arranged in the tower body and comprises a catalyst fixing bed, a first packing filled with catalysts, and at least one of second tower plates in which catalysts are arranged; the catalytic decomposition section is positioned below the first air inlet and above the liquid outlet. The nitric acid purification device for treating MN regeneration tower bottom solution according to the embodiment of the invention has the outstanding advantages of high reaction efficiency, obvious energy conservation and emission reduction effects, small occupied land, saved investment, short flow and the like.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a nitric acid purification device for treating the bottom solution of an MN regeneration tower, and also relates to a nitric acid purification process for treating the bottom solution of an MN regeneration tower. Background technique [0002] At present, the large-scale industrial coal-to-ethylene glycol process mainly uses alcohols and NO and NO 2 The reaction produces methyl nitrite (MN), and MN is oxidatively coupled on a Pd catalyst to obtain dimethyl oxalate (DMO), which is then catalytically hydrogenated to obtain EG. Among them, the methyl nitrite (MN) regeneration tower plays a key role in the whole process. In the current process, some N produced by the reaction will be discharged intermittently in the MN regeneration tower 2 O by-product gas, in order to make up for the loss of nitrogen oxides, a part of nitric acid is usually added to the system to generate enough NO and NO ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/24C01B21/40
CPCB01J19/0006B01J19/0053B01J19/24C01B21/40
Inventor 耿皎阮建飞秦松
Owner NANJING UNIV
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