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Method and device for preparing high-concentration dilute nitric acid

A dilute nitric acid, high-concentration technology, applied in nitric acid, nitrogen oxides/oxyacids, etc., can solve the problem of low concentration of dilute nitric acid, and achieve the effect of promoting oxidation reaction, increasing acid concentration, and improving absorption rate

Active Publication Date: 2014-09-03
TIANJI COAL CHEM IND GROUP
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Problems solved by technology

[0012] In order to solve the technical problems existing in the existing double pressurization nitric acid production process, increase the concentration of the finished product dilute nitric acid, and meet the needs of modern industrial production, the present invention effectively solves the technical problem of the low concentration of the finished product dilute nitric acid produced by the double pressurization system, Increase the concentration of nitric acid above 68-70%

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  • Method and device for preparing high-concentration dilute nitric acid
  • Method and device for preparing high-concentration dilute nitric acid

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Embodiment Construction

[0041] In order to further understand the technical content, characteristics and effects of the present invention. Take a company's nitric acid production plant with an annual output of 270,000 tons as an example, and describe it in detail with the accompanying drawings.

[0042] like figure 1 As shown, the first-stage air filter of the four-stage air filter device 5 communicates with the ammonia-air condenser 4, the droplet separator 3, and the air preheater 2 successively, and the air preheater 2 communicates with the four-stage air filter device 5 again. The second, third, and fourth-stage air filters are connected, and the air outlet of the fourth-stage air filter device 5 is connected with the air compressor 1, which is used to make the air pass through the first-stage air filter to remove impurities, cool down and condense through the ammonia-air condenser 4, The condensed water is removed by the droplet separator 3, the dust is removed by the second, third and fourth a...

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Abstract

The invention discloses a method and device for preparing high-concentration dilute nitric acid. The method comprises the following steps: carrying out ammonia-air mixing, ammoxidation, condensation separation and fine separation on air subjected to impurity removal and dehumidification and liquid ammonia subjected to impurity removal, oil removal and evaporation, absorbing in an absorption tower in which 40 tower plates are arranged, meanwhile, carrying out cooling heat exchange by a three-stage water circulation technique to obtain the high-concentration dilute nitric acid of which the concentration is not lower than 68-70%. The method and device effectively enhance the nitric acid absorption efficiency, enhance the concentration of the dilute nitric acid, and can better satisfy the demands of modern industry for high-concentration dilute nitric acid.

Description

technical field [0001] The invention belongs to the technical field of nitric acid production, and in particular relates to a production method and a device for preparing high-concentration dilute nitric acid by using a double pressurization method. Background technique [0002] At present, the preparation of nitric acid by double-pressurization method is the main production process of nitric acid used at home and abroad. With the advantages of low consumption and high ammonia utilization rate, the concentration of nitric acid in the product can reach 60~68%, which is the best nitric acid production process recognized at home and abroad so far. [0003] However, there are still some problems in the actual production of the double-pressurized dilute nitric acid production process, which will affect the daily production and operation. The problems are mainly concentrated in the following points. [0004] 1. In the double pressurized nitric acid production plant, the purificat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/40
Inventor 李向远张河成路安华李超刘金亮赵建设
Owner TIANJI COAL CHEM IND GROUP
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