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Structure and method for improving oxidation degree and efficiency in preparation process of dilute acid with high concentration of 65-68%

A preparation process, high-concentration technology, applied in chemical instruments and methods, separation methods, nitrogen dioxide, etc., can solve the problems of reduced absorption efficiency and low oxidation performance of nitrogen monoxide.

Active Publication Date: 2022-04-08
SEDIN ENG
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Problems solved by technology

[0003] The invention patent with the patent number of CN106698368A discloses a nitrogen monoxide wet oxidation process, by setting a mixed gas absorption section in the lower part of the absorption tower, a nitrogen monoxide oxidation section in the middle, and a nitrogen dioxide absorption section in the upper part, through the absorption section. Nitrogen dioxide gas in the mixed gas is absorbed, and the unabsorbed nitric oxide is oxidized through the oxidation section, but during the oxidation process, it is not oxidized by a high-concentration dilute acid with a concentration higher than 65%, so that the oxidation section is more sensitive to nitric oxide Oxidation performance is low, resulting in lower absorption efficiency

Method used

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  • Structure and method for improving oxidation degree and efficiency in preparation process of dilute acid with high concentration of 65-68%
  • Structure and method for improving oxidation degree and efficiency in preparation process of dilute acid with high concentration of 65-68%
  • Structure and method for improving oxidation degree and efficiency in preparation process of dilute acid with high concentration of 65-68%

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Embodiment Construction

[0027] Embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary, and are only for explaining the present application, and should not be construed as limiting the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents falling within the spirit and scope of the appended claims.

[0028] figure 1 It is a structural schematic diagram of improving the oxidation degree and efficiency in the preparation process of 65%-68% high-concentration dilute acid proposed by an embodiment of the present application.

[0029] see figure 1 , figure 2 and image 3 , a structure for increasing the degree of oxidation and efficiency in the preparat...

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Abstract

The invention provides a structure for improving the oxidation degree and efficiency in the preparation process of 65-68% high-concentration dilute acid. The structure comprises an absorption tower, the absorption tower comprises an absorption zone and an oxidation reaction zone from top to bottom; the absorption area is provided with a plurality of layers of absorption tower trays, a secondary downcomer is arranged on the absorption tower tray on the bottommost side of the absorption area, and the secondary downcomer is used for introducing at least one part of 65-68% finished product nitric acid generated on the absorption tower trays into the oxidation reaction area; and oxidizing nitric oxide in the nitric oxide gas by using the finished nitric acid. The secondary downcomer is arranged on the absorption tower disc, so that high-concentration dilute nitric acid on the absorption tower disc can directly flow to the oxidation reaction area, nitric oxide in the oxidation reaction area can be oxidized, and the oxidation degree and the absorption efficiency of nitric oxide gas are improved.

Description

technical field [0001] The application relates to the technical field of preparation of high-concentration dilute nitric acid, in particular to a structure and method for improving the oxidation degree and efficiency in the preparation process of 65%-68% high-concentration dilute acid. Background technique [0002] In the preparation process of dilute nitric acid, the nitrogen oxide gas generated after ammonia oxidation is usually passed into the absorption tower for absorption, but due to the presence of nitrogen monoxide gas in the nitrogen oxide gas, the nitrogen monoxide gas cannot react with water, thereby reducing the In order to improve the absorption rate of nitrogen oxide gas, in the prior art, nitrogen oxide gas is oxidized to oxidize nitrogen monoxide in nitrogen oxide gas into nitrogen dioxide, which is beneficial to the absorption of nitrogen oxide gas. [0003] The invention patent with the patent number of CN106698368A discloses a nitrogen monoxide wet oxidati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/56C01B21/36C01B21/40
CPCY02A50/20
Inventor 杨璐韩芳李跃斌王冀宁周军孙林赵世平
Owner SEDIN ENG
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