Preparation method and device of monochloramine

A monochloramine and ammonium chloride technology, applied in chemical instruments and methods, special treatment targets, inorganic chemistry, etc., can solve the problems of insufficient attention to pH value of reaction control conditions, high degree of automation, and high technical support requirements, and achieve improved Labor production efficiency, saving and its auxiliary equipment, the effect of shortening the production cycle

Active Publication Date: 2020-06-19
ZHUZHOU JIANGHAI ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The common feature of the existing patented methods is a high degree of automation; compared with manual operation, the technical guarantee requirements for maintaining stable production and operation are also high, the equipment investment is relatively large, the plant area is relatively large, and the important reaction control condition pH value is not paid enough attention or hard to take care of
[0006] The stability of monochloramine is poor, it is easy to decompose when the pH value exceeds the appropriate range, and the decomposition is accelerated when the medium temperature is high
The synthesis and decomposition of monochloramine, the reaction heat is very large, it is difficult to increase the concentration of preparation; the degradation of monochloramine is accompanied by the drop of pH value, the higher the concentration, the faster the pH value drops, making it more difficult to increase the concentration of preparation

Method used

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  • Preparation method and device of monochloramine

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Effect test

Embodiment 1

[0049] Measure 17 kg of raw material sodium hypochlorite and put it into sodium hypochlorite solution feeding metering tank 3 (hereinafter referred to as metering tank 3), and measure 240 kg of raw material water into metering tank 3 through a metering pump; the concentration of sodium hypochlorite in metering tank 3 is 0.7% based on NaClO, and the total solution is 257 Kilogram. Measure 1.3 kg of ammonium chloride powder and put it into reactor 2; at the same time, use a metering pump to measure 85 kg of raw water into reactor 2; simultaneously use liquid level metering to measure 2 kg of 5% HCl from hydrochloric acid solution feeding metering tank 4 into the reactor 2; In reactor 2, the concentration of ammonium chloride is 1.465%, the total amount of the solution is 88.3 kg, and the pH value is 2.2. Quickly add 147 kg of 0.7% NaClO to the reactor 2 within 2 minutes to raise the pH value of the reaction solution to 8.9, and then use a pump to meter 150 kg of raw water to the...

Embodiment 2

[0051] Measure 17 kilograms of raw material sodium hypochlorite and put it into metering tank 3, and metering pump measures 240 kilograms of raw material water into metering tank 3; the concentration of sodium hypochlorite in metering tank 3 is 0.7% based on NaClO, and the total solution is 257 kilograms. Measure 1.3 kg of ammonium chloride powder and put it into reactor 2; at the same time, use a metering pump to measure 88 kg of raw water into reactor 2; simultaneously use liquid level metering to measure 2.5 kg of 5% HCl from hydrochloric acid solution feeding metering tank 4 into the reactor 2; In reactor 2, the concentration of ammonium chloride is 1.41%, the total amount of the solution is 91.8 kg, and the pH value is 1.64. Quickly add 206 kg of 0.7% NaClO to the reactor 2 within 2 minutes to raise the pH value of the reaction solution to 8.9, and then use a pump to meter 150 kg of raw material water to the reactor 2. While opening the slower speed and continuously addin...

Embodiment 3

[0053] Measure 17 kilograms of raw material sodium hypochlorite and put it into metering tank 3, and metering pump measures 240 kilograms of raw material water into metering tank 3; the concentration of sodium hypochlorite in metering tank 3 is 0.7% based on NaClO, and the total solution is 257 kilograms. Measure 1.3 kilograms of powder ammonium chloride and put it into reactor 2; at the same time, measure 88 kilograms of raw water into reactor 2 with a metering pump; simultaneously measure 4 kilograms of 5% mixed acid into reactor 2 with a liquid level metering method, and the mixed acid is 5 %HCl and 5% H 3 PO 4 Mixed at a weight ratio of 1:1; in reactor 2, the concentration of ammonium chloride is 1.39%, the total amount of the solution is 93.3 kg, and the pH value is 2.16. Quickly add 188 kg of 0.7% NaClO to Reactor 2 within 2 minutes to raise the pH value of the reaction solution to 8.9, and then use a pump to meter 150 kg of raw material water to Reactor 2. While conti...

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Abstract

The invention discloses a preparation method and device for monochloramine. The preparation method comprises the following steps: (1) by taking ammonium chloride and sodium hypochlorite as reaction raw materials, firstly dissolving ammonium chloride in the reaction raw materials to obtain ammonium chloride solution, and adding acid for regulating pH value of the ammonium chloride solution to be 1-3, wherein the acid is phosphoric acid and / or hydrochloric acid; (2) adding sodium hypochlorite into the ammonium chloride solution again, and stirring, so that pH value is increased to 8-9; and (3) respectively adding sodium hypochlorite and solution containing phosphoric acid into the ammonium chloride solution again, and stirring, so that pH value of mixed solution is maintained to be 8-9; andobtaining monochloramine solution after sodium hypochlorite is completely added. The preparation method disclosed by the invention has the advantages that product cost is low, and product concentration reaches up to 1000ppm; stability is relatively good, the product can be stably stored for 30 minutes, and decomposition rate is 1%; and tests show that pH value of the product is stable and is lowered slowly.

Description

technical field [0001] The invention relates to a preparation method and device of monochloramine, in particular to a preparation method and device of monochloramine used for disinfection of tap water. The invention relates to the technical field of drinking water disinfectants. Background technique [0002] Monochloramine is also known as monochloramine, and its chemical formula is NH 2 Cl is a newly added disinfectant in the new version of the National Sanitation Standard for Drinking Water. Since the monochloramine is unstable, especially the water solution is more likely to decompose by itself, so the current method of use is to choose the ready-to-use. [0003] Domestic waterworks are promoting the use of monochloramine disinfectants. The preparation of monochloramine can avoid the direct use of chlorine gas and liquid ammonia, that is, choose the process route with sodium hypochlorite and ammonium chloride as raw materials. The use of monochloramine not only does no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/09C02F1/50
CPCC01B21/091C02F1/50C02F2303/04
Inventor 唐涛杨卫国罗新波曾轶
Owner ZHUZHOU JIANGHAI ENVIRONMENTAL PROTECTION
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