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H acid denitration waste gas resource utilization method

A technology for recycling and denitrification, applied in the field of H acid denitrification waste gas recycling, can solve the problems of high treatment cost, high cost, large consumption of sodium hydroxide, etc., and achieve the effects of stable nitric acid concentration, efficient absorption and good economic benefits

Active Publication Date: 2014-10-08
通辽市龙盛化工有限公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The H-acid denitrification waste gas involved in the above patents is absorbed by lye. On the one hand, waste water containing nitrate and sodium hydroxide is produced, and the cost of waste water treatment is high; on the other hand, a large amount of sodium hydroxide is consumed in the process of waste gas absorption. The cost is also higher

Method used

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  • H acid denitration waste gas resource utilization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: Existing technology that does not adopt reclaiming dilute nitric acid

[0034] Add H acid sulfonated material (the amount of substance is 5kmol, and the total acidity of sulfonated compound is 70.2%) in the nitration kettle, open the cooling water and cool down to 55°C, then add 98% nitric acid 418kg from the nitric acid metering tank (the converted nitric acid amount is 6.5kmol), the nitrification temperature is controlled at 55 ± 2 ℃, and the time of adding nitric acid is 4~5 hours, and after nitrification finishes, it is incubated for 0.5 hour again, sampling analysis, the purity of nitrate (main product) is at 80.3%, yield ( According to nitrous value) at 95.7%.

Embodiment 2

[0035] Example 2: Continuous denitrification recovery dilute nitric acid reuse to denitrification process

[0036]Take H acid nitration liquid (nitration liquid feed rate is 3000L / h) and water according to the volume ratio of 1:0.4 into the first-level denitrification kettle continuously, the overflow of the first-level denitrification kettle enters the second-level denitration kettle, and the denitrification temperature is controlled at 60±5℃, while blowing air from the secondary denitrification kettle, the exhaust gas from the secondary denitrification kettle is blown into the first-stage denitrification kettle, and the exhaust gas from the first-stage denitrification kettle enters the first-stage smoke absorption tower, and the absorption liquid is sprayed in the tower at room temperature Leaking and absorption (the spraying operation of the following towers is the same), the exhaust gas of the first-level gunpowder smoke absorption tower enters the second-level gunpowder sm...

Embodiment 3

[0038] Embodiment 3: Intermittent denitrification reuse

[0039] Add 3000L of nitrates into the denitrification pot, open the intake valve of the nitrogen oxide absorption circulation system, and then add 1200L of water to the denitrification pot from the water metering tank within 1.5 hours, and at the same time, inject compressed air to bubble, and the denitrification waste gas enters the first-level smoke absorption tower , spray absorption with absorption liquid at room temperature in the tower (the spraying operation of the following towers is the same), the exhaust gas of the first-stage gunpowder smoke absorption tower enters the second-stage gunpowder smoke absorption tower, the exhaust gas of the second-stage gunpowder smoke absorption tower enters the third-stage gunpowder smoke absorption tower, and the third-stage gunpowder smoke absorption tower exhaust enters the third-stage gunpowder smoke absorption tower The tail gas of the first-grade gunpowder smoke absorptio...

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Abstract

The invention discloses an H acid denitration waste gas resource utilization method. The method comprises the following steps: (1) a nitration product obtained from an H acid production process and water with a volume ratio of 1:0.2-0.5 are added into a denitration device, wherein the denitration device comprises at least one denitration kettle; a denitration temperature is controlled at 50-100 DEG C; at a same time, compressed air is delivered into the denitration device for bubbling, such that denitration waste gas is discharged into a nitric smoke absorption device, wherein the nitric smoke absorption device comprises at least one nitric smoke absorption tower; water is used as an absorbing agent in the nitric smoke absorption tower; after absorption, dilute nitric acid with a concentration of 20-60% is obtained; waste gas discharged from the nitric smoke absorption device is delivered into an alkali liquid absorption tower; after alkali liquid spraying and absorption, waste gas is subjected to upper-air emission; the denitrified nitration product obtained from the denitration device is used in a next step of a neutralization process; and (2) the dilute nitric acid obtained through the step (1) is mixed with 98% nitric acid, such that nitric acid with a concentration of 60-95% is obtained; the nitric acid is added into a sulfonated material obtained through the H acid production process, and a nitrification reaction is carried out.

Description

(1) Technical field [0001] The invention relates to a method for resource utilization of H-acid denitrification waste gas, and belongs to the technical field of H-acid production. (2) Background technology [0002] H acid (1-amino-8-naphthol-3,6-disulfonic acid) monosodium salt is an important naphthalene dye intermediate, widely used in printing and dyeing, textile, chemical and other industries. At present, the main production process in China is: naphthalene sulfonation to produce 1,3,6-trisulfonate naphthalene, and then nitration to obtain nitro-T acid, and the nitration mixture is depleted of nitrogen oxides, neutralized with ammonia water and then reduced with iron powder to obtain Amino T acid, isolate amino T acid, replace ammonium salt with sodium salt, add solvent and sodium hydroxide for alkali fusion, and isolate H acid monosodium salt. [0003] The nitration reaction of sulfonated compounds is carried out with nitric acid as a nitrating agent. In order to ensur...

Claims

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Application Information

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IPC IPC(8): C07C309/50C07C303/32C07C303/22C01B21/40
Inventor 何旭斌陶建国孟明朱敬鑫何豪华王新武苏建军
Owner 通辽市龙盛化工有限公司
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