Device and method for removing nitrogen oxides from hexanedioic acid tail gas

A nitrogen oxide, adipic acid technology, applied in adipic acid production, chemical instruments and methods, nitrous oxide capture, etc., can solve problems such as atmospheric environment damage, and achieve the effect of avoiding overheating

Pending Publication Date: 2017-06-13
PINGDINGSHAN PUEN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the nitrous gas in the tail gas of adipic acid is recycled and utilized in post-processes such as the nitric acid absorption tower of the adipic acid

Method used

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  • Device and method for removing nitrogen oxides from hexanedioic acid tail gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] see figure 1 , a device for removing nitrogen oxides in adipic acid tail gas, comprising a dilution unit, a first reaction unit, and a second reaction unit connected in sequence through pipelines, the dilution unit includes a gas-liquid separation unit connected in sequence through pipelines device 1, compressed air dilution container 2 and the first concentration online analyzer 3; the first reaction unit includes a feed preheater 4, a heating device 5, a first reaction device 6 and a gas / gas exchange unit connected in sequence through pipelines Heater 7 ; the second reaction unit includes a second concentration on-line analyzer 8 , a mixing system 9 , a second reaction device 10 , a third concentration on-line analyzer 11 and a heat recovery device 12 connected in sequence through pipelines.

[0028] A plurality of plug-in thermometers (not shown in the figure) are arranged on the top of the first reaction device 6 and the second reaction device 10, and each thermomet...

Embodiment 2

[0030] see figure 1 , a method for removing nitrogen oxides by utilizing the removal device of nitrogen oxides in the adipic acid tail gas described in embodiment 1, its concrete steps are as follows:

[0031] ①Dilution process: send the adipic acid tail gas to the gas-liquid separator 1, after removing moisture, the tail gas enters the compressed air dilution container 2 and mixes with the compressed air; in the diluted mixed gas, a The volume concentration of nitrous oxide is detected by the first concentration online analyzer 3 to keep the volume concentration of nitrous oxide at 8-15%;

[0032] ②The first reaction process: the diluted mixed gas passes through the feed preheater 4 for feed preheating and countercurrent heat exchange, so that the temperature is raised to 130 ° C ~ 170 ° C, and then the mixed gas is introduced into the heating In the device 5, the temperature of the mixed gas is raised to 380-550°C, and after the temperature is constant, the mixed gas is sen...

Embodiment 3

[0036] Taking an adipic acid plant with an annual output of 140,000 tons as an example, the temperature of the adipic acid tail gas is 32°C, the pressure is 1.9MPa, and the flow rate is 11t / h. The nitrous oxide in the tail gas is 50wt%, and the nitrous oxide and Nitrogen dioxide 0.1wt%, nitrogen 42.2wt%, nitrogen dioxide, nitric oxide and water 7.7wt%.

[0037]First, through the dilution process: send the tail gas of adipic acid to the gas-liquid separator 1, remove the moisture and mix it with compressed air. Depending on the concentration, the volume concentration of nitrous oxide is controlled at 8-15% by the first concentration online analyzer 3 to enter the first reaction process. The flow ratio of compressed air / adipic acid tail gas is set by the DCS system, and can also be adjusted according to the feedback from the first concentration online analyzer 3 or the outlet temperature of the catalyst bed of the nitrous oxide reactor in the first reaction device.

[0038] The...

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PUM

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Abstract

The invention discloses a device for removing nitrogen oxides from hexanedioic acid tail gas. The device comprises a diluting unit, a first reaction unit and a second reaction unit, wherein the diluting unit comprises a gas-liquid separator, a compressed air diluting container and a first concentration online analyzer which are connected in sequence through a pipeline; the first reaction unit comprises a charging preheater, a heating device, a first reaction device and a gas/gas heat exchanger which are connected in sequence through a pipeline; the second reaction unit comprises a mixing system, a second concentration online analyzer, a second reaction device, a third concentration online analyzer and a heat recycling device which are connected in sequence through a pipeline; the tops of the first reaction device and the second reaction device are provided with a plurality of insertion type thermometers; each thermometer is provided with a plurality of temperature measuring points from top to bottom on a catalyst bed. By adopting the device, a catalyst can run stably for a long time in a high-temperature acid environment, the reaction activity of the catalyst bed is kept, the removing rate of nitrogen monoxide is 98 percent or more, and the removing rates of nitrogen dioxide and nitrogen monoxide are 95 percent or more.

Description

[0001] Technical field: [0002] The invention relates to a tail gas treatment device and method, in particular to a device and method for removing nitrogen oxides in adipic acid tail gas, belonging to the technical field of adipic acid production. [0003] Background technique: [0004] In the production process of adipic acid, the production process of nitric acid catalytic oxidation of cyclohexanol is widely used, and a large amount of nitrous gas will inevitably be produced in this production process. The tail gas components produced by adipic acid mainly include: nitrous oxide 38%V / V, nitrogen 54%V / V, and residual oxygen, carbon oxides, water vapor, NO X and other mixed acid gases. About 0.27t of nitrous oxide, 700ppm of nitrogen dioxide and 1000ppm of nitrogen monoxide are produced for every 1t of adipic acid produced. By the end of 2015, the domestic production capacity of adipic acid was about 2.5 million tons, and the annual production of nitrous oxide was about 675,...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56
CPCB01D53/8631B01D53/869B01D2257/40B01D2257/402Y02C20/10Y02A50/20Y02P20/30
Inventor 赵铎陈聚良史红军王亚新陈亚春潘强钟儒学张军明吕国辉冯继伟梁甫
Owner PINGDINGSHAN PUEN TECH CO LTD
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