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Method for preparing hydrazine from urine

A technology for urine and raw materials is applied in the field of preparing hydrazine by using urine as a raw material, which can solve problems such as affecting the competitiveness of hydrazine hydrate in a urea process, and achieve the effects of reducing nitrogen load, reducing costs and high application value.

Active Publication Date: 2017-07-21
BEIJING GUOHUAN TSINGHUA ENVIRONMENT ENG DESIGN & RES INST CO LTD BEIJING CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with foreign countries, the current urea price in my country is generally low, which is beneficial to urea-based hydrazine hydrate, but the future trend of the urea market will directly affect the competitiveness of urea-based hydrazine hydrate

Method used

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  • Method for preparing hydrazine from urine
  • Method for preparing hydrazine from urine

Examples

Experimental program
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Effect test

Embodiment 1

[0034] According to the processing parameter of table 1, adopt following steps to prepare the method for hydrazine with urine as raw material, comprise the steps:

[0035] (1) preparation of sodium hypochlorite-sodium hydroxide solution: feed chlorine into sodium hydroxide solution, make sodium hypochlorite-sodium hydroxide solution, make the mol ratio of sodium hypochlorite and sodium hydroxide in the sodium hypochlorite-sodium hydroxide solution be 1: 2;

[0036] (2) Low-temperature reaction: Add sodium hypochlorite-sodium hydroxide solution into fresh urine so that the molar ratio of urea, sodium hypochlorite, and sodium hydroxide in the reaction system is 1.05:1:2; keep stirring, the reaction temperature is 15°C, and the reaction time 30min;

[0037] (3) High-temperature reaction: After the reaction is completed, the material is transferred into a reaction kettle and rapidly heated to boiling, and discharged after reflux for 5 minutes to obtain hydrazine.

[0038] Measur...

Embodiment 2-17

[0041] Except for the contents shown in Table 1, Examples 2 to 17 were performed in a similar manner to Example 1, and the yield of hydrazine was calculated.

[0042] Table 1 process parameter and the productive rate of hydrazine

[0043]

[0044]

[0045] Note: in embodiment 8, catalyzer is magnesium sulfate; In embodiment 9, catalyzer is magnesium chloride.

[0046] When the concentration of urea in urine is 15g / L, the conversion rate of urea is 59.4%, and the yield of hydrazine reaches 3.18g (hydrazine) / L (urine). It can be seen from Table 1 that with the increase of urea concentration in the reaction system, the urea conversion rate is on the rise, and after the urea concentration reaches 30g / L, the urea conversion rate is stable at about 80%. At this time, continue to increase the urea concentration, urea The conversion rate did not change significantly. Compared with Examples 1-5, the conversion rate of urea is obviously increased after using the additive. When ...

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Abstract

The invention discloses a method for preparing hydrazine with urine as the raw material. The method includes the following steps that firstly, a sodium hypochlorite-sodium hydroxide solution is prepared, wherein chlorine is introduced in a sodium hydroxide solution, the sodium hypochlorite-sodium hydroxide solution is prepared, and the molar ratio of sodium hypochlorite to sodium hydroxide in the sodium hypochlorite-sodium hydroxide solution is 1:2; secondly, low-temperature reaction is conducted, wherein the sodium hypochlorite-sodium hydroxide solution is added into fresh urine, so that the molar ratio of urea to sodium hypochlorite to sodium hydroxide in a reaction system is 1.05:1:2; stirring is continuously conducted, reaction temperature is not higher than 15 DEG C, and reaction time is not shorter than 30 min; thirdly, high-temperature reaction is conducted, wherein materials are conveyed into a reaction kettle to be quickly heated to be boiled after reaction, reflux is conducted for 5 min, then discharging is conducted, and hydrazine is prepared. The method can reduce nitrogen loads in urine waste water, denitrification of urine wastewater is achieved, hydrazine high in application value can also be manufactured, and cost of urea raw materials required in hydrazine preparation in chemical plants is reduced.

Description

technical field [0001] The invention relates to the technical field of urine waste water resource treatment, in particular to a method for preparing hydrazine by using urine as a raw material. Background technique [0002] The technical background related to the present invention will be described below, but these descriptions do not necessarily constitute the prior art of the present invention. [0003] In my country, the removal of nitrogen in sewage has not been effectively solved. With the advancement of large-scale urbanization, water environmental problems such as eutrophication of water bodies tend to be serious. Human urine (yellow water) is an important source of nitrogen in urban domestic sewage. Recycling nitrogen in urine will effectively reduce the nitrogen that is finally discharged into the water body and alleviate the problem of water eutrophication. The source separation system can separate and collect urine wastewater from the source for resource treatment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/16
CPCC01B21/16
Inventor 汪诚文施匡围李继云潘俊豪
Owner BEIJING GUOHUAN TSINGHUA ENVIRONMENT ENG DESIGN & RES INST CO LTD BEIJING CHINA
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