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A method for transforming hydrazine hydrate in waste water

A technology for hydrazine hydrate and waste water, which is applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage treatment, etc. It can solve problems such as pollution, large dosage of chemicals, and low efficiency at low temperature, and achieve simple follow-up treatment process, Wide application and promotion prospects, overcoming the effect of bulky equipment

Inactive Publication Date: 2018-03-09
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method requires a large amount of chemicals and high cost, and the secondary treatment of a large amount of sludge generated during the treatment process, as well as the pollution of chloride ions and phosphates introduced by the addition of chemicals are still problems that need to be solved.
The treatment effect of the biological treatment method is limited by the biological activity. This technology has strict requirements on the quality of the influent water, occupies a large area, has low efficiency at low temperature, and has a long cycle. It is not suitable for large-scale promotion.

Method used

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  • A method for transforming hydrazine hydrate in waste water

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Comparison scheme
Effect test

Embodiment 1

[0022] Add 1300ml solution containing 0.1% hydrazine hydrate in 5L reactor, add 0.03g transition metal compound H 2 PtCl 6 ·6H 2 O, 0.04g protective agent PVP powder, 1.6ml 95% ethanol solvent, adjust the pH of the solution to 9 with ammonia water, control the reaction temperature at 10°C, stir at a rate of 80 rpm, and react for 24 hours.

[0023] In this embodiment, the content of hydrazine hydrate before the reaction was 0.1%, and the content of hydrazine hydrate after the reaction was 0.07%.

Embodiment 2

[0025] Add 1300ml solution containing 1% hydrazine hydrate in 5L reactor, add 0.12g transition metal compound RuCl 3 ·3H 2 O, 0.16g protective agent PVA powder, 6.4ml 95% ethanol solvent, adjust the pH of the solution to 10 with ammonia water, control the reaction temperature at 20°C, stir at a rate of 80 rpm, and react for 24 hours.

[0026] In this embodiment, the content of hydrazine hydrate before the reaction was 1%, and the content of hydrazine hydrate after the reaction was 0.54%.

Embodiment 3

[0028] Add 1300ml solution containing 5% hydrazine hydrate in 5L reactor, add 0.6g transition metal compound FeCl 2 4H 2 O, 0.8g protective agent PVP powder, 32ml 95% ethanol solvent, adjust the pH of the solution to 11 with NaOH, control the reaction temperature at 30°C, stir at a rate of 80 rpm, and react for 24 hours.

[0029] In this embodiment, the content of hydrazine hydrate before the reaction was 5%, and the content of hydrazine hydrate after the reaction was 1.4%.

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Abstract

The invention discloses a method for converting hydrazine hydrate in waste water. The method comprises the steps that a transition metal compound and an alcohol solvent are added to the waste water containing hydrazine hydrate, the pH is adjusted to be 9-14 with NaOH or ammonia water, and a reaction is conducted at the stirring speed of 50-200 rpm and the temperature of 10-40 DEG C for 18-24 h, wherein the transition metal compound is chloride of Fe or Co or Ni or Ru or Pd or Pt or a nitric acid compound, the molar ratio of the transition metal compound to hydrazine hydrate is 1:(400-500), and the mass ratio of the alcohol solvent to a protective agent is (20-40):1. According to the method for converting hydrazine hydrate in the waste water, a series of problems that in the traditional ammonia-nitrogen waste water treatment technology, the equipment size is huge, power consumption is large, the energy consumption cost is high, the occupied area is large, and the water quality requirement is strict are solved.

Description

technical field [0001] The invention belongs to the technical field of organic wastewater treatment, and in particular relates to a method for converting hydrazine hydrate in wastewater. Background technique [0002] Hydrazine hydrate is an important raw material for fine organic synthesis and has a wide range of uses. There are mainly 35%, 40%, 55%, 64%, 80%, 85% and 100% specifications. It has a wide range of uses. More than 1 / 3 of the distribution of hydrazine is used as an oxygen scavenger for boiler water. Hydrazine (including hydrazine hydrate and hydrazine sulfate) used in foaming agents accounts for about 30%, and 10% is used in pharmaceuticals. Since the hydrazine hydrate molecule contains two nucleophilic nitrogens and four replaceable active hydrogens, the fine chemical products using hydrazine hydrate as raw materials involve almost all fields. Hydrazine hydrate is a strong reducing agent with strong reducing and corrosive properties, and can corrode glass, rub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F101/30
CPCC02F1/725C02F2101/30
Inventor 陈秉辉孙孟玲郑进保张诺伟陈翠华
Owner XIAMEN UNIV