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Method for preparing de-chlorinating agent by grafting reaction of chitosan oligosaccharide and benzotriazole compound and de-chlorinating agent prepared thereby

A technology of benzotriazoles and chitosan oligosaccharides, which is applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc. and other problems, to achieve the obvious effect of dechlorination

Pending Publication Date: 2020-08-18
天津润昌水处理环保科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the condition of external anodic polarization, as long as the medium contains a certain amount of chloride ions, the corrosion nuclei may develop into corrosion pits, which will lead to accelerated corrosion and seriously affect the service life of the equipment, especially for stainless steel equipment.
[0004] The removal of chloride ions is very difficult, because most of its compounds are soluble in water, so it is difficult to remove
The concentration of chlorine can only be reduced by means of a large amount of sewage discharge, which causes a large waste of energy and water resources, which is not conducive to energy saving and emission reduction. This problem has always been a major problem that plagues the safe and stable operation of equipment
[0005] 1. Equipment dechlorination, such as reverse osmosis, ion exchanger, electro-adsorption dechlorination, etc., is difficult to achieve large-scale dechlorination, and the investment is huge, and the operation and maintenance costs are high
[0006] 2. The price of some pharmaceuticals such as silver nitrate, bismuth nitrate, copper oxide and other precious metals is too high to realize large-scale industrial use
Some adsorption-type chlorine removal substances such as lignin or cationic starch are too inefficient to be used at higher chloride ion concentrations, which limits their application range, so the above-mentioned chemical substances have not yet produced a real commercial chlorine removal product
[0007] 3. Secondary pollution cannot be eliminated during use, increasing environmental pressure
Elimination of secondary pollution still needs to invest a lot of money

Method used

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  • Method for preparing de-chlorinating agent by grafting reaction of chitosan oligosaccharide and benzotriazole compound and de-chlorinating agent prepared thereby
  • Method for preparing de-chlorinating agent by grafting reaction of chitosan oligosaccharide and benzotriazole compound and de-chlorinating agent prepared thereby
  • Method for preparing de-chlorinating agent by grafting reaction of chitosan oligosaccharide and benzotriazole compound and de-chlorinating agent prepared thereby

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preparation example Construction

[0021] 1) Preparation of chitosan oligosaccharides: Under the protection of inert gas, mix chitosan, deionized water, and acidic antioxidant at low speed, and hydrolyze at 35-40°C for 1h-1.5h to generate M=4000-5000Da , the chitosan oligosaccharide of n=4~50 repeating units, wherein deionized water, chitosan, acidic antioxidant are according to mass ratio, and deionized water: chitosan: acidic antioxidant is 8~10:1 ~2:0.2~0.3,

[0022] 2) Immediately after the completion of the hydrolysis, use NaOH to adjust the pH value to 8-9, add benzotriazole compounds with 40% chitosan mass, stir at a medium speed, heat up to 70-80°C for grafting reaction, keep the temperature for 2 hours, and control for 2 hours- After 2.5 hours, the temperature was lowered to 25°C, and a colorless or light yellow viscous finished product was obtained, which is a dechlorination agent.

[0023] The acidic antioxidant is C 6 h 8 o 6 、C 6 h 8 o 6 Sodium salt and C 6 h 8 o 6 One or more of the pota...

Embodiment 1

[0032] (1) Pass N into the 250ml reactor 2 Gas five minutes, add deionized water 88ml, acidic antioxidant C 6 h 8 o 6 2 grams, 10 grams of chitosan, stirring at a low speed, the stirring speed is 35rpm / min, turn on the condenser, heat up to 35-40°C, keep the temperature for 1 hour, and complete the hydrolysis reaction. At this time, chitosan is hydrolyzed into oligomeric chitosan, and the molecular weight measured by viscosity method should be 4000-5000 Da, and n=40-50 repeating units. Reaction formula:

[0033]

[0034] (2) Immediately after the completion of the hydrolysis, adjust the pH value to 8-9 with NaOH, add 4 grams (40% of chitosan quality) of 1-hydroxybenzotriazole, stir to 80rpm / min, and heat up to 70-80 ℃, reacted for 2h, and completed. Control the annealing within 2h to 2.5h and cool down to 25°C before discharging.

[0035] Reaction formula:

[0036]

Embodiment 2

[0038] (1) Pass N into the 500ml reactor 2 Gas for 10 minutes, add 175ml of deionized water, acidic antioxidant C 6 h 8 o 6 、C 6 h 8 o 6 2.5 grams each of sodium salt, 20 grams of chitosan, stirred at a low speed, the stirring speed is 35 rpm / min, the condenser is turned on, the temperature is raised to 40°C, and the reaction is kept for 1.5 hours to complete the hydrolysis reaction. At this time, chitosan is hydrolyzed into oligomeric chitosan, and the molecular weight measured by viscosity method should be 4000-5000 Da, and n=40-50 repeating units.

[0039](2) Immediately after the completion of the hydrolysis, use NaOH to adjust the pH value to 8-9, add 3 g of benzotriazole and 5 g of 1-hydroxymethyl benzotriazole, stir and increase to 80 rpm / min, and heat up to 75-80 °C , heat preservation reaction for 2 hours, after the reaction is completed, anneal and cool down to 25 degrees Celsius within 2 hours to 2.5 hours before discharging.

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Abstract

The invention discloses a method for preparing a de-chlorinating agent by grafting reaction of chitosan oligosaccharide and a benzotriazole compound and a de-chlorinating agent prepared thereby. The method comprises the following steps: adding an acidic antioxidant into chitosan under the protection of inert gas, and carrying out hydrolysis for 1-1.5 hours at 35-40 DEG C to generate chitosan oligosaccharide M=4000-5000 Da. N=40-50, then carrying out a grafting reaction with a benzotriazole compound for 2 hours under a condition: pH=8-9 at a temperature of 70-80 DEG C, cooling, reducing the temperature to 25 DEG C within 2-3 hours, and discharging to obtain a colorless or faint yellow viscous finished product, namely the efficient de-chlorinating agent, which can be applied to industrial boiler water treatment and industrial circulating cooling water systems. After several years of actual operation, the average removal rate of chlorine radicals in a boiler can reach 90% or above, and the chlorine removal effect is obvious.

Description

technical field [0001] The invention relates to a preparation method of a chlorine removal agent, specifically, a method for preparing a chlorine removal agent by grafting reaction of chitosan oligosaccharide and a benzotriazole compound and the obtained chlorine removal agent. Background technique [0002] During the operation of equipment that uses water as the heat transfer medium, such as thermal boilers and heat pipe network systems, and cooling circulating water systems, due to the use and operation loss of water media, the operating water of cooling circulating water systems, boilers and heat pipe network systems will experience With the concentration process, a large amount of water is required. Long-term operation makes the chloride ions in the water continuously condense, and the concentration of chloride ions continues to increase. The strong corrosion of chloride ions has become one of the hidden dangers of boilers and other equipment. [0003] The destructive ef...

Claims

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Application Information

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IPC IPC(8): C08B37/08C02F1/58C02F101/12
CPCC02F1/58C02F2101/12C08B37/003
Inventor 李学刚马宝全
Owner 天津润昌水处理环保科技有限公司
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