Circular concentration method for treating dilute nitric acid produced by nitrotoluene waste sulfuric acid

A technology of nitrotoluene and dilute nitric acid, which is applied in the direction of nitric acid, nitrogen oxides/oxyacids, etc., can solve the problems of waste of nitro compounds, difficulty in realizing continuous separation of free nitro compounds, etc., achieve high degree of automation and improve use Value, the effect of increasing economy

Active Publication Date: 2018-03-20
HUBEI DONGFANG CHEM IND
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Problems solved by technology

[0003] Dilute nitric acid contains a lot of free nitro compounds; the density range of dilute nitric acid is 1.1kg/L-1.25kg/L, and the density of nitro compounds is about 1.19kg/L. The densities of the two materials are very sim

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  • Circular concentration method for treating dilute nitric acid produced by nitrotoluene waste sulfuric acid

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Embodiment Construction

[0046] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0047] Such as figure 1 As shown, the device provided by the present invention for processing the cyclic enrichment method of dilute nitric acid produced by nitrotoluene waste sulfuric acid includes a cooler 1, an automatic separator 2, a manual separator 3, a handover tank 5, and a nitrogen oxide compressor unit. 6. The nitrogen oxide absorption tower 7 and the liquid and gas pipelines; the nitrogen oxide compressor unit 6 includes a nitrogen oxide compressor 6.1 and a separator 6.2 connected back and forth.

[0048] The cooler 1, the automatic separator 2, the manual separator 3, the handover tank 5, and the nitrogen oxide compressor unit 6 are connected in sequence through a liquid pipeline. The outlet pipeline of the nitrogen oxide compressor unit 6 is divided into two parallel paths, one way leads to the nitrogen oxide through a gas pipeline Abso...

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Abstract

The invention discloses a circular concentration method for treating dilute nitric acid produced by nitrotoluene waste sulfuric acid. The circular concentration method comprises a start-up phase and aproduction stage, wherein the production stage comprises the following steps: cooling 15%-40% low concentration dilute nitric acid produced from a denitration condenser for waste sulfuric acid treatment, and mixing the dilute nitric acid with concentrated nitric acid with a mass friction higher than or equal to 50% until the density of the mixture is larger than that of nitrotoluene; separating free nitrotoluene liquid, and concentrating by virtue of a nitrogen oxide compressor unit until the concentration is higher than or equal to 50%; applying a part of concentrated sulfuric acid with theconcentration higher than or equal to 50% to subsequent density adjustment, and discharging the other part into a finished product tank region; and compressing and absorbing nitrogen oxide gas by virtue of a nitrogen oxide compressor, absorbing nitrogen oxide gas by virtue of a nitrogen oxide absorbing tower, and discharging until nitrogen oxide gas reaches the standards. The circular concentration method is applicable to the separation and concentration of nitrotoluene in low-concentration dilute nitric acid with middle in the treatment of waste sulfuric acid, so that the use value of low-value dilute nitric acid is increased, the production balancing problem of dilute nitric acid is well solved, and the treatment economy of waste sulfuric acid is increased.

Description

Technical field [0001] The invention relates to a waste acid concentration chemical process, in particular to a cyclic concentration method of dilute nitric acid produced by processing nitrotoluene waste sulfuric acid. Background technique [0002] At present, the most advanced waste sulfuric acid treatment technology in the world is the vacuum concentration of waste sulfuric acid and the pressure absorption of nitrogen oxides; the denitration process of vacuum concentration of waste sulfuric acid generally produces condensed dilute nitric acid with a concentration of 15%-40%, such as waste sulfuric acid For nitrotoluene waste acid, the dilute nitric acid contains a large amount of free nitrotoluene; the nitrogen oxide produced in the denitration process of waste sulfuric acid is condensed and then sent to the nitrogen oxide pressurized nitrogen oxide absorption tower for absorption, which is generally used 0.65mPa working pressure, absorption of nitrogen oxides emission concentr...

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Application Information

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IPC IPC(8): C01B21/44C01B21/40
CPCC01B21/40C01B21/44C01P2006/80
Inventor 朱学明沈鹏向雷王彬彬周树亮陈云
Owner HUBEI DONGFANG CHEM IND
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