CN1322684A - Method of eliminating nitrogenous matters from hydrazine hydrate saline-alkali mud - Google Patents
Method of eliminating nitrogenous matters from hydrazine hydrate saline-alkali mud Download PDFInfo
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- CN1322684A CN1322684A CN 01108544 CN01108544A CN1322684A CN 1322684 A CN1322684 A CN 1322684A CN 01108544 CN01108544 CN 01108544 CN 01108544 A CN01108544 A CN 01108544A CN 1322684 A CN1322684 A CN 1322684A
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- saline
- hydrazine hydrate
- alkali
- mud
- hypochlorite
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Abstract
The present invention features that nitrogenous hydrazine in saline-alkali mud is oxidized by heated hypochlorous radical so that the saturated saline-alkali solution contains nitrogenous matter less than 4 mg/L in total ammonia and may be used as electrolytic material. The present invention makes it possible to utilize resource and protected environment.
Description
Hydrazine hydrate is an important chemical raw material and widely applied to the production of medicines and pesticides, and most of the hydrazine hydrate at the present stage adopts a urea sodium hypochlorite oxidation method, a hydrogen peroxide oxidation method or an ammonia catalytic oxidation method. The method is mainly used for oxidizing urea by sodium hypochlorite in China, but the method produces hydrazine hydrate and simultaneously produces a large amount of byproducts: the saline-alkali soil is a mixture which contains sodium chloride, sodium carbonate, trace hydrazine hydrate and nitrogen-containing substances, and the components in the saline-alkali soil have utilization values, wherein the sodium chloride and the sodium carbonate are raw and auxiliary materials for electrolysis, and due to the existence of the nitrogen-containing substances, the saline-alkali soil can generate explosive substances in the electrolysis process of a caustic soda plant: nitrogen trichloride, which limits the use of saline-alkali soil. Therefore, if the saline-alkali mud is required to be effectively recycled, nitrogen removal is a very critical link. The prior nitrogen removal process adopts a calcination method, namely, the saline-alkali mud is calcined for nitrogen removal, and the calcined saline-alkali mud mixture can be used as a raw material and an auxiliary material for electrolysis, but the saline-alkali mud is preheated firstly by using the method, and hydrazine hydrate is discharged into the atmosphere in a gas form in the preheating process, so that the following defects exist: firstly, energy is wasted; secondly, the environment is polluted; thirdly, the operation is complex and the investment is large.
The invention aims to provide a method for removing nitrogen from hydrazine hydrate saline-alkali mud to make up for the defects of the prior art, and the method can effectively remove nitrogen-containing components in the hydrazine hydrate saline-alkali mud and realize comprehensive recycling of sodium chloride and sodium carbonate in the saline-alkali mud.
The purpose of the invention is realized as follows: a method for removing nitrogenous substances in hydrazine hydrate saline-alkali mud is characterized by comprising the following steps: because the nitrogenous substance in the saline-alkali mud exists in the form of a hydrazine reductive substance, a chlorine water solution containing hypochlorite is added into the saline-alkali mud according to a proportion, the mixture is stirred and heated, the temperature of the mixed liquid is kept at 95-110 ℃, the temperature is kept for 3-10 minutes, the hydrazine reductive nitrogenous substance in the saline-alkali mud reacts with the hypochlorite to generate nitrogen and the nitrogen is discharged outwards, and the main ion reaction equation is as follows: thus, the mixed salt-alkali solution containing nitrogen and total ammonia of less than or equal to 4mg/l is prepared, water is added into the mixture to dissolve the mixture to form saturated solution, and the solution is neutralized by carbon dioxide to be used as the raw and auxiliary materials for electrolysis.
Example I
Raw materials:
the saline-alkali soil used in the embodiment is saline-alkali soil generated in the hydrazine hydrate production by a sodium hypochlorite urea oxidation method, and the saline-alkali soil contains 32% of sodium chloride, 35% of sodium carbonate, 6% of sodium hydroxide, 0.1% of hydrazine hydrate, 26.9% of water and other substances;
the hypochlorite solution used in this example was chlorine water containing 0.24% hypochlorite in terms of available chlorine and the remaining 99.76% hypochlorite was water and other substances.
The process comprises the following steps:
100g of saline-alkali soil is added to 90g of chlorine water (according to hydrazine hydrate: ClO)-= 1: 3.0 molar ratio batching)), heating while stirring, keeping the temperature at 105 ℃, and detecting that the total ammonia in the solution is equal to 2mg/l after keeping the temperature for 3 minutes.
Example II
The saline-alkali soil used in the embodiment is saline-alkali soil generated in the hydrazine hydrate production by a sodium hypochlorite urea oxidation method, and the saline-alkali soil contains 32% of sodium chloride, 35% of sodium carbonate, 6% of sodium hydroxide, 0.1% of hydrazine hydrate, 26.9% of water and other substances;
the hypochlorite solution used in this example was chlorine water, and the hypochlorite contained in the chlorine water was 0.24% in terms of available chlorine, and the remaining 99.76% was water and other substances.
The process comprises the following steps:
100g of saline-alkali soil is added to 80g of chlorine water (according to hydrazine hydrate: ClO)-= 1: 2.8 molar ratio batching)), heating while stirring, keeping the temperature at 95 ℃ for 10 minutes, and detecting that the total ammonia in the solution is equal to 1 mg/l.
Example III
The saline-alkali soil used in the embodiment is saline-alkali soil generated in the production of hydrazine hydrate by a steel hypochlorite urea oxidation method, and the saline-alkali soil contains 32% of sodium chloride, 35% of sodium carbonate, 6% of sodium hydroxide, 0.1% of hydrazine hydrate, 26.9% of water and other substances;
the hypochlorite solution used in this example was chlorine water containing 0.24% hypochlorite in terms of available chlorine and the remaining 99.76% hypochlorite was water and other substances.
The process comprises the following steps:
100g of saline-alkali soil was added to 74g of chlorine water (as hydrazine hydrate: ClO)-= 1: 2.5 molar ratio batching)), heating while stirring, keeping the temperature at 110 ℃ for 7 minutes, and detecting that the total ammonia in the solution is equal to 3 mg/l.
Claims (1)
1. A method for removing nitrogenous substances in hydrazine hydrate saline alkali is characterized in that: the hypochlorite is used for directly oxidizing the hydrazine reductive nitrogen-containing substance, so that the total ammonia of a saturated solution prepared from the hydrated hydrazine salt alkali mud is less than or equal to 4 mg/l.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01108544 CN1322684A (en) | 2001-06-15 | 2001-06-15 | Method of eliminating nitrogenous matters from hydrazine hydrate saline-alkali mud |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01108544 CN1322684A (en) | 2001-06-15 | 2001-06-15 | Method of eliminating nitrogenous matters from hydrazine hydrate saline-alkali mud |
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| Publication Number | Publication Date |
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| CN1322684A true CN1322684A (en) | 2001-11-21 |
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| CN 01108544 Pending CN1322684A (en) | 2001-06-15 | 2001-06-15 | Method of eliminating nitrogenous matters from hydrazine hydrate saline-alkali mud |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1331772C (en) * | 2005-04-22 | 2007-08-15 | 宜宾天原股份有限公司 | Method for treating wastewater of rectification for producing hydrazine hydrate by carbamide method |
| CN100389893C (en) * | 2005-10-13 | 2008-05-28 | 宜宾天原股份有限公司 | Recovering method of acetone and ammonia in hydrated hydrazine waste salt water by ketone azine method |
| CN100425553C (en) * | 2006-12-22 | 2008-10-15 | 昆明锦洋化学工业有限公司 | Hydrazine hydrate byproduct 5% salt water processing and reclamation method |
| CN102040197A (en) * | 2010-11-17 | 2011-05-04 | 株洲化工集团诚信有限公司 | Method for removing ammonia nitrogen in hydrazine hydrate evaporation byproduct residues containing alkali salt by utilizing urea method |
| TWI400200B (en) * | 2008-03-28 | 2013-07-01 | An Cheng Lee | Process and apparatus of deodorizing and recycling for aluminum dross |
-
2001
- 2001-06-15 CN CN 01108544 patent/CN1322684A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1331772C (en) * | 2005-04-22 | 2007-08-15 | 宜宾天原股份有限公司 | Method for treating wastewater of rectification for producing hydrazine hydrate by carbamide method |
| CN100389893C (en) * | 2005-10-13 | 2008-05-28 | 宜宾天原股份有限公司 | Recovering method of acetone and ammonia in hydrated hydrazine waste salt water by ketone azine method |
| CN100425553C (en) * | 2006-12-22 | 2008-10-15 | 昆明锦洋化学工业有限公司 | Hydrazine hydrate byproduct 5% salt water processing and reclamation method |
| TWI400200B (en) * | 2008-03-28 | 2013-07-01 | An Cheng Lee | Process and apparatus of deodorizing and recycling for aluminum dross |
| CN102040197A (en) * | 2010-11-17 | 2011-05-04 | 株洲化工集团诚信有限公司 | Method for removing ammonia nitrogen in hydrazine hydrate evaporation byproduct residues containing alkali salt by utilizing urea method |
| CN102040197B (en) * | 2010-11-17 | 2012-10-31 | 株洲化工集团诚信有限公司 | Method for removing ammonia nitrogen in hydrazine hydrate evaporation byproduct residues containing alkali salt by utilizing urea method |
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