Device for treating diluted nitric acid by treating nitrotoluene waste sulfuric acid through absorption tower
A technology of nitrotoluene and absorption tower, 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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[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 similar, and it is difficult to achieve free Continuous separation of nitro compounds from dilute nitric acid; in the subsequent nitration production, a large amount of nitro compounds are wasted and combined side reactions produce
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[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0041] Such as figure 1 As shown, the device provided by the present invention for the treatment of dilute nitric acid produced by the waste sulfuric acid of nitrotoluene in the absorption tower includes a cooler 1, an automatic separator 2, a manual separator 3, a flash evaporator 4, a transfer tank 5, and a nitrogen oxide compressor unit 6. The nitrogen oxide absorption tower 7 and the liquid pipeline and the gas pipeline; the nitrogen oxide compressor unit 6 includes a nitrogen oxide compressor 6.1 and a separator 6.2 connected back and forth.
[0042]Cooler 1, automatic separator 2, manual separator 3, transfer tank 5, and nitrogen oxide compressor unit 6 are connected sequentially through liquid pipelines, and the outlet pipeline of nitrogen oxide compressor unit 6 is divided into two parallel paths, one of which leads to nitroge...
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The invention discloses a device for treating diluted nitric acid by treating nitrotoluene waste sulfuric acid through an absorption tower. The device comprises a cooler, an automatic separator, a manual separator, a flash evaporator, a transferring groove, a nitrogen oxide compressor set and the nitrogen oxide absorption tower, wherein the cooler, the automatic separator, the manual separator, the transferring groove and the nitrogen oxide compressor set are connected in sequence through a liquid pipeline; an outlet pipeline of the nitrogen oxide compressor set is divided into two paths; onepath is introduced to the nitrogen oxide absorption tower through a gas pipeline, and the other path is continually divided into two parallel paths through a liquid pipeline, wherein one path is introduced into the automatic separator through the flash evaporator and the other path is arranged to be a finished-product discharging pipe. The device disclosed by the invention is suitable for separating nitrotoluene of the low-concentration diluted nitric acid and improving the concentration in a waste sulfuric acid treatment process, and improving the application value of the low-value diluted nitric acid; the production balance problem of the diluted nitric acid is solved relatively well, and the economical efficiency of a waste sulfuric acid treatment device is improved.
Description
technical field [0001] The invention relates to a chemical process for enriching waste acid, in particular to a device for treating dilute nitric acid produced by treating waste sulfuric acid from nitrotoluene with an absorption tower. Background technique [0002] At present, the more advanced waste sulfuric acid treatment process in the world is the vacuum concentration of waste sulfuric acid and the pressure absorption of nitrogen oxides; the denitration process of waste sulfuric acid vacuum concentration generally produces condensed dilute nitric acid with a concentration of 15%-40%, such as waste sulfuric acid If it is nitrotoluene waste acid, the dilute nitric acid contains a large amount of free nitrotoluene; the nitrogen oxides produced in the waste sulfuric acid denitrification process are condensed and sent to the nitrogen oxide pressurized nitrogen oxide absorption tower for absorption, and the pressurized nitrogen oxide absorption tower generally adopts 0.65mPa w...
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Login to View More 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