Preparation method of boiler feedwater deoxidant carbohydrazide and low polymer thereof
A technology of boiler feed water and carbohydrazide, which is applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve unsatisfactory problems, achieve mild reaction, improve solubility and oxygen removal Efficiency, simple operation effect
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Embodiment 1
[0037] Add 0.30 g of elemental iodine into a 500 mL three-necked flask containing 180 g of dimethyl carbonate, stir evenly, and heat the reaction system to 60°C. Then, 187.5 g of industrial-grade hydrazine hydrate with a concentration of 80% was dropped into the three-neck flask through a constant-pressure dropping funnel within 1 h under stirring conditions, and the temperature of the reaction system was kept at 60°C. After the dropwise addition, continue to react at 60°C for 1.5h, then distill under reduced pressure, cool, crystallize, and dry to obtain 101.7g of white needle-like crystals, that is, carbohydrazide and its oligomers.
[0038] Experimental results show that the conversion rate of dimethyl carbonate is 68.7% (GC method), and the active content of oxygen scavenger is 99.6%. The oxygen removal performance test was carried out at a water temperature of 80°C, and the pH value of the water sample was adjusted to 9.0 with organic amines. The test results showed that ...
Embodiment 2
[0040] Add 0.30 g of elemental iodine into a 500 mL three-necked flask containing 180 g of dimethyl carbonate, stir evenly, and heat the reaction system to 75°C. Then, 187.5 g of industrial-grade hydrazine hydrate with a concentration of 80% was dropped into the three-necked flask through a constant-pressure dropping funnel within 1.5 h under stirring conditions, and the temperature of the reaction system was kept at 75°C. After the dropwise addition, continue to react at 75°C for 2.0 h, then distill under reduced pressure, cool, crystallize, and dry to obtain 126.1 g of white needle-like crystals, that is, carbohydrazide and its oligomers.
[0041] The experimental results show that the conversion rate of dimethyl carbonate is 85.2% (GC method), and the active content of oxygen scavenger is 102.9%. The oxygen removal performance test was carried out at a water temperature of 80°C, and the pH value of the water sample was adjusted to 9.0 with organic amines. The test results s...
Embodiment 3
[0043] Add 0.65 g of elemental iodine to a 1 L three-necked flask containing 180 g of dimethyl carbonate, stir evenly, and heat the reaction system to 85°C. Then, 375 g of industrial-grade hydrazine hydrate with a concentration of 40% was dropped into the three-neck flask through a constant-pressure dropping funnel within 1.5 h under stirring conditions, and the temperature of the reaction system was kept at 85°C. After the dropwise addition, continue to react at 85°C for 2.0 h, then distill under reduced pressure, cool, crystallize, and dry to obtain 92.3 g of white needle-like crystals, that is, carbohydrazide and its oligomers.
[0044] The experimental results show that the conversion rate of dimethyl carbonate is 62.4% (GC method), and the active content of oxygen scavenger is 98.1%. The oxygen removal performance test was carried out at a water temperature of 80°C, and the pH value of the water sample was adjusted to 9.0 with organic amines. The test results showed that th...
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