A kind of nitric acid decolorization method and device

A decolorization and nitric acid technology, which is applied in the direction of nitric acid, nitrogen oxides/oxyacids, etc., can solve the problems that cannot meet the requirements and standards of downstream products, and achieve the effect of small investment and simple production and operation

Active Publication Date: 2015-11-18
ANHUI JINHE IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The concentration of the finished dilute nitric acid in the existing double-pressurized dilute nitric acid device has been around 60% in actual operation, and the highest concentration does not exceed 68%, which cannot meet the needs of various industries for high-concentration dilute nitric acid. It is the demand for dilute nitric acid with a concentration of 65-68%
However, the 68% nitric acid produced after the ratio of dilute nitric acid to concentrated nitric acid will turn into yellow nitric acid, which cannot meet the requirements of downstream products.

Method used

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  • A kind of nitric acid decolorization method and device
  • A kind of nitric acid decolorization method and device

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Effect test

Embodiment 1

[0019] Such as figure 1 As shown, a kind of nitric acid stripping decolorization device provided by the present invention comprises a decolorization tower, the inlet pipe of the decolorization gas and the 68% white nitric acid storage tank (ground tank) are respectively connected to the bottom of the decolorization tower, and the high-level acid is respectively connected to the top of the decolorization tower through pipelines. The tank and the gas-liquid separator, an acid pump is also connected between the top of the decolorization tower and the high-level acid tank, the outlet pipe of the gas-liquid separator is connected to the NOx compressor, and the liquid outlet pipe of the gas-liquid separator is connected to the high-level acid tank.

[0020] Process flow of the present invention is:

[0021] In the elevated acid tank, add 0.75T of 60% dilute nitric acid and 0.25T of 98% concentrated nitric acid to prepare 68.% yellow nitric acid.

[0022] The outlet air of the air c...

Embodiment 2

[0024] Embodiment two utilizes tail gas decolorization, can realize unpowered production:

[0025] Such as figure 2 As shown, in the high-level acid tank, mix 60% acid and 98% concentrated nitric acid in a certain proportion to prepare 68.% yellow nitric acid, which enters the upper part of the decolorization tower under the action of potential difference, and controls the flow rate of 8-10m 3 / h.

[0026] The exhaust gas from the outlet of the exhaust gas turbine (or expander) controls the flow (about 2000NM 3 / H), enter the decolorization tower and contact with the 68% acid from the upper part in countercurrent, the bleached 68% white nitric acid enters the 68% white nitric acid tank, and the decolorized tail gas is merged into the system tail gas and emptied together.

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Abstract

The invention relates to a nitric acid gas stripping and decolorizing method and device. The nitric acid gas stripping and decolorizing device is characterized by comprising a decolorization tower, wherein the bottom of the decolorization tower is respectively connected with a decolorized gas inlet pipe and a 68% white nitric acid storage tank; the top of the decolorization tower is respectively connected with a high-level acid tank and a gas-liquid separator through pipelines; an acid tank is also connected between the top of the decolorization tower and the high-level acid tank; an air outlet pipe of the gas-liquid separator is connected with an NOx compressor; a liquid discharging pipe of the gas-liquid separator is connected with the high-level acid tank. 68% yellow nitric acid is brown down and decolorized by using gas from an outlet of a hollow press or expansion machine of a split pressure nitric acid process device, so that the quality of a product is improved, the requirement for processing a downstream product is met. The device is simple in principle, and safe and convenient to operate.

Description

technical field [0001] The invention relates to a production method of nitric acid in the field of chemical raw materials, in particular to a method and a device for stripping and decolorizing 68% yellow nitric acid by using air or tail gas in the system as the purge gas. Background technique [0002] The concentration of the finished dilute nitric acid in the existing double-pressurized dilute nitric acid device has been around 60% in actual operation, and the highest concentration does not exceed 68%, which cannot meet the needs of various industries for high-concentration dilute nitric acid. It is the demand for dilute nitric acid with a concentration of 65-68%. And the 68% nitric acid that makes after dilute nitric acid and concentrated nitric acid ratio all can turn into yellow nitric acid, can not satisfy the requirement standard of downstream product. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the prio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/46
Inventor 田家民汪永生
Owner ANHUI JINHE IND CO LTD
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