Method for continuously dilution diluting aqua fortis and controlling generation of NO2

A concentrated nitric acid, NO2 technology, applied in the direction of nitric acid, nitrogen oxides/oxyacids, etc., can solve the problems of complex dilution equipment, large pollution, low efficiency, etc., to avoid the decomposition of nitric acid and reduce the temperature.

Inactive Publication Date: 2009-05-13
陈淮银
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  • Abstract
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Problems solved by technology

[0003] Purpose of the present invention is exactly in order to overcome the efficiency lower, NO 2 Disadvantages of large pollution and complicated dilution equipment provide a method that can continuously dilute concentrated nitric acid and control NO in the process 2 generated method

Method used

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  • Method for continuously dilution diluting aqua fortis and controlling generation of NO2

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Embodiment Construction

[0012] As shown in Figure 1, the stainless steel pipe is connected to the concentrated nitric acid storage tank through a flow meter and a power pump, and the concentrated nitric acid 3 is transported to the high end on the right side of the flat-bottomed tank 2 by the pump according to the required flow rate, so that it flows to the left. Concentration and quantity, the spray water 1 is continuously sprayed to the surface of the flowing concentrated nitric acid 3 through the distributor, the two are mixed during the flow, and flow to the low-end dilute nitric acid container 5. During this period, the cooling medium 4 can be passed through the interlayer at the bottom of the flat-bottomed tank 2 to lower the temperature.

[0013] For example, taking 98% concentrated nitric acid as an example, at 20°C, the area of ​​the stainless steel pipe for pumping concentrated nitric acid is 66cm 2 , the flow rate of concentrated nitric acid is 12.63cm / s, and the area of ​​the flat-bottome...

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Abstract

The invention relates to a method for continuously diluting aquafortis and controlling the production of NO2, which is characterized in that the method comprises the following steps: causing the auqafortis to flow through a flat-bottomed channel; continuously spraying water to the surface of flowing nitric acid from the upper part, so that the auqafortis and the water are mixed during the flowing process; and collecting diluted nitric acid by using a container arranged at the other low end of the flat-bottomed channel. An interlayer is arranged at the bottom part of the flat-bottomed channel; and a cooling medium is introduced into the interlayer, so as to further reduce and dilute the temperature of the nitric acid. The invention has the advantages that the water is continuously sprayed on the surface of the flowing nitric acid to increase and dilute the contact area of a heating part, air and the cooling medium; and liquid finishes the mixture during the flowing process and immediately carries away heat generated to control heat accumulation during the diluting process, so that the temperature of the heating part is reduced, the decomposition of the nitric acid is controlled or avoided, and the continuous and automatic diluting process of the auqafortis is achieved.

Description

technical field [0001] The invention relates to a method of continuously diluting concentrated nitric acid and controlling NO in the process 2 generated method. technical background [0002] As a basic chemical raw material, nitric acid has a wide range of general uses, and different companies have different requirements for the concentration of nitric acid. The concentration of industrial nitric acid generally produced by nitric acid manufacturers is 98%. When using it, nitric acid needs to be diluted with water to the required concentration. The general method of adding is to add a certain amount of water into the container in advance, and then add nitric acid to it to reach the desired concentration. Concentration after discharge, and then start the next round of operation. It is a method of intermittent dilution, and the heat released during the dilution of nitric acid is very easy to cause heat accumulation, so that the NO produced by the decomposition of nitric acid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/38
Inventor 陈淮银
Owner 陈淮银
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