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Method for improving ammonia-nitrogen content of H acid wastewater

A technology for ammonia nitrogen content and wastewater, applied in chemical instruments and methods, water pollutants, sulfonic acid preparation, etc., can solve problems such as difficulty in H acid production and poor wastewater treatment, and achieve improved treatment, reduction of polluted emissions, and environmental protection. Effect

Inactive Publication Date: 2017-04-26
ZHEJIANG RIWA GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to poor wastewater treatment, many domestic H acid manufacturers have been ordered to stop production, resulting in a very difficult situation for the production of H acid in my country

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: a kind of method for improving ammonia nitrogen content of H acid waste water, carry out according to the following steps:

[0023] a. Denitrification:

[0024] 4700 parts of 2% aqueous solution are passed into 3500 parts of nitrated materials from the bottom of the tank in 3 hours, and the tail gas is absorbed by 5% sodium hydroxide aqueous solution;

[0025] Sampling is detected to see whether it reaches the end point, if it is less than the end point, it is necessary to add 300 parts of concentration of 4% sodium carbonate aqueous solution;

[0026] b. Separation of by-product sodium sulfate hydrate:

[0027] Add sodium hydroxide with a concentration of 32% to the material, adjust the pH value to 1, then cool down to below 60°C, and then adjust the pH value to 8 with a concentration of 5% ammonia water; continue to cool down to 10°C, filter, and use ice-water mixture Wash the filter cake until there is no color; obtain sodium sulfate hydrate, use it d...

Embodiment 2

[0035] Embodiment 2: a kind of method of improving ammonia nitrogen content of H acid waste water, carry out according to the following steps:

[0036] a. Denitrification:

[0037] In 3.5 hours, 4700 parts of 3% aqueous solution are passed into 3500 parts of nitrated materials from the bottom of the tank, and the tail gas is absorbed by 20% sodium hydroxide aqueous solution;

[0038] Sampling is detected to see whether it reaches the end point, if it is less than the end point, it is necessary to add 400 parts of concentration of 4% sodium carbonate aqueous solution;

[0039] b. Separation of by-product sodium sulfate hydrate:

[0040] Add sodium hydroxide with a concentration of 32% to the material, adjust the pH value to 1.5, then lower the temperature to below 60°C, and then use 20% ammonia water to adjust the pH value to 8-9; continue to cool down to 12°C, filter, and use ice Wash the filter cake with water mixture until it has no color; obtain sodium sulfate hydrate, us...

Embodiment 3

[0048] Embodiment 3: a kind of method of improving ammonia nitrogen content of H acid waste water, carry out according to the following steps:

[0049] a. Denitrification:

[0050] In 4 hours, feed 4700 parts of 4% aqueous solution into 3500 parts of nitrated materials from the bottom of the tank, and absorb the tail gas with 40% sodium hydroxide solution;

[0051] Sampling is detected to see whether it reaches the end point, if it does not reach the end point, it is necessary to add 500 parts of concentration of 4% sodium carbonate aqueous solution;

[0052] b. Separation of by-product sodium sulfate hydrate:

[0053] Add sodium hydroxide with a concentration of 32% to the material, adjust the pH value to 2, then lower the temperature to below 60°C, and then use 30% ammonia water to adjust the pH value to 8-9; continue to cool down to 15°C, filter, and use ice Wash the filter cake with water mixture until it has no color; obtain sodium sulfate hydrate, use it directly after...

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PUM

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Abstract

The invention relates to an improvement on the ammonia-nitrogen content of H acid wastewater, in particular to a method for improving the ammonia-nitrogen content of the H acid wastewater. The method comprises steps of denitration, separation of sodium sulfate hydrate serving as a byproduct, reduction and T acid dissociation. According to the method, the treatment of the wastewater in a product preparation process can be improved to protect the environment and reduce pollutant discharge.

Description

technical field [0001] The invention relates to a method for improving the ammonia nitrogen content of H-acid wastewater, in particular to a method for improving the ammonia nitrogen content of H-acid wastewater. Background technique [0002] H acid products are generally paste or powder. Slightly soluble in cold water, soluble in alkaline solutions such as soda ash and caustic soda. H-acid monosodium salt is mainly used in the production of acidic, direct and reactive dyes, such as acid magenta 6B, acid scarlet G, acid black 10B, direct black, reactive brilliant red K-2BP, reactive violet K-3R, reactive blue There are more than 90 kinds of dyes such as K-R. These dyes are used for dyeing woolen and cotton fabrics. [0003] At present, the "trisulfonation-alkali fusion method" is mainly used in China to produce H acid, that is, naphthalene is sulfonated with sulfuric acid or 65% oleum to obtain 1,3,6-naphthalene trisulfonic acid, which is then nitrated with mixed acid and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C01D5/02C07C303/44C07C303/22C07C309/47C02F101/16C02F103/36
CPCC02F9/00C01D5/02C02F1/52C02F1/66C02F1/70C02F2101/16C02F2103/36C07C303/22C07C303/44C07C309/47
Inventor 方百红杨鹏
Owner ZHEJIANG RIWA GRP
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