Method for gasifying unsymmetrical dimethylhydrazine waste liquor through supercritical water

A technology of supercritical water gasification and unsymmetrical dimethyl hydrazine, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of secondary pollution, high toxicity, etc. The effect of large processing capacity and low operating cost

Active Publication Date: 2015-05-20
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The treatment speed of the chlorination method is fast, but it will produce nitrosamines and chlorinated hydrocarbons. These substances are highly toxic and will cause secondary pollution when discharged into water. In addition, a large amount of h

Method used

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  • Method for gasifying unsymmetrical dimethylhydrazine waste liquor through supercritical water
  • Method for gasifying unsymmetrical dimethylhydrazine waste liquor through supercritical water
  • Method for gasifying unsymmetrical dimethylhydrazine waste liquor through supercritical water

Examples

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Effect test

Embodiment 1

[0036] Example 1 Utilize Ru / C and skeleton nickel in supercritical water to make catalyst gasification unsymmetrical dimethylhydrazine

[0037]In the catalytic gasification experiment of unsymmetrical dimethylhydrazine, the following three catalysts with better catalytic gasification results under supercritical water conditions were selected: carbon-supported ruthenium (Ru / C), Raney nickel 3110 (RTH3110) , Raney Nickel 4110 (RTH4110). It can be seen from Table 1-1 that when no catalyst is added, as the temperature increases from 550°C to 600°C, H 2 The mole fraction of CH gradually increased, CH 4 The mole fraction of gradually decreases, when the catalyst is added, compared with no catalyst, the H 2 The mole fraction of H has been significantly increased. As the temperature increases from 550°C to 600°C, H 2 The mole fraction of CH gradually decreases, CH 4 The mole fraction of the gradually increased. h 2 and CH 4 The output of the same law with the increase of temper...

Embodiment 2

[0042] The impact of different oxidant concentrations in embodiment 2 supercritical water on degrading unsymmetrical dimethylhydrazine

[0043] In the partial oxidation gasification experiment of unsymmetrical dimethylhydrazine, the selected oxidant is H 2 o 2 . It can be seen from Table 1-2 that when no oxidant is added, as the temperature increases from 500°C to 600°C, H 2 The mole fraction of CH gradually increased, CH 4 The mole fraction of H gradually decreases, and as the amount of oxidant increases, H 2 and CH 4 The mole fraction and yield of CO gradually decrease, while the CO 2 The mole fraction and yield gradually increased.

[0044] In terms of COD removal rate, as the amount of oxidant increases, its COD removal rate increases gradually, all above 99%, and its ammonia nitrogen content gradually decreases with the addition of oxidant.

[0045] Table 1-2 Partial oxidation treatment results of unsymmetrical dimethylhydrazine

[0046] (material quality (unsymme...

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Abstract

The invention discloses a method for gasifying unsymmetrical dimethylhydrazine waste liquor through supercritical water. The method comprises the following steps of adding an unsymmetrical dimethylhydrazine water solution to a reaction kettle; heating a temperature-controlled electric furnace, and carrying out leakage detection on the reaction kettle by using high-pressure argon at the same time; after the temperature inside the temperature-controlled electric furnace reaches preset temperature and is stable, placing the reaction kettle into the temperature-controlled electric furnace for heating; controlling and regulating the heating power of the temperature-controlled electric furnace by utilizing a K-shaped armoured thermocouple inside the temperature-controlled electric furnace so as to change the heating rate inside the reaction kettle; after the temperature inside the reaction kettle reaches the preset temperature, keeping constant temperature, and reacting unsymmetrical dimethylhydrazine with supercritical water which is positioned in the reaction kettle and heated and pressurized to a supercritical state; after the reaction is finished, taking the reaction kettle out of the temperature-controlled electric furnace, and reducing to room temperature; and opening a gas collecting valve to collect a gaseous sample to complete the gasification of the unsymmetrical dimethylhydrazine waste liquor. The process can be carried out in a continuous supercritical water fixed bed device or an intermittent reaction kettle. A device is simple in structure, low in operation cost and high in COD removal rate.

Description

【Technical field】 [0001] The invention belongs to the field of clean utilization of renewable resources and waste, and in particular relates to a method for gasifying unsymmetrical dimethylhydrazine with supercritical water. 【Background technique】 [0002] Unsymmetrical dimethylhydrazine, as the main fuel for space launch propellants, has many superior properties and is widely used in rocket power devices. With the development of my country's aerospace industry, its usage is also increasing. Its molecular formula is (CH 3 ) 2 N 2 h 2 , is highly volatile, has a pungent odor, and belongs to Class III toxic substances. Unsymmetrical dimethylhydrazine is flammable and explosive, and a certain amount of waste liquid will be produced during the production and use of unsymmetrical dimethylhydrazine. The safe disposal of unsymmetrical dimethylhydrazine waste liquid is a difficult problem for scientific and technological workers. [0003] There are many ways to deal with unsymm...

Claims

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Application Information

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IPC IPC(8): C02F1/02C02F1/72C02F101/38
CPCC02F1/02C02F1/725C02F2101/38
Inventor 郭烈锦伊磊侯瑞琴欧阳晓平金辉朱超
Owner XI AN JIAOTONG UNIV
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