A kind of preparation method of sulfamic acid series water reducer
A technology of sulfamic acid series and water reducer, which is applied in the field of cement admixture production, can solve the problems of restricting the application of sulfamate high-efficiency water reducer, poor water retention of concrete, and unsatisfactory phenol output, etc., and achieve environmental protection Value, reduction of industrial waste discharge, effect of shortening extraction time
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Embodiment 1
[0022] (1) Pretreatment of phenol-containing wastewater; (i) removing impurities in phenol-containing wastewater by coarse filtration; (ii) 500 g of methyl isobutyl ketone, 130 g of sodium alginate, and N,N dimethylformamide The mixed solution of 150mL and 78g of butyl carbonate is used as the extractant and the phenol-containing wastewater treated in step (i) is loaded into the extraction container according to the volume ratio of 1:5, stirred rapidly at 50°C for 15min and then allowed to stand for 60min; (iii) The solution after step (ii) standing still is separated into the lower raffinate phase and the upper extract phase, and gas chromatography is used to analyze the content of phenolic substances in the raffinate phase to obtain crude phenol.
[0023] (2) Preparation of water reducer: (i) Add 450g of crude phenol obtained in step (1) and 50g of para-sodium to water in sequence, then add 1g of caustic soda until the pH value of the mixture is adjusted to 8, and add 90g of ...
Embodiment 2
[0027] (1) Pretreatment of phenol-containing wastewater; (i) removing impurities in phenol-containing wastewater by coarse filtration; (ii) 200 g of methyl isobutyl ketone, 50 g of sodium alginate, and N,N dimethylformamide The mixed solution of 75mL and 30g of butyl carbonate is used as the extractant and the phenol-containing wastewater treated in step (i) is loaded into the extraction container according to the volume ratio of 1:4, and it is stirred rapidly at 50°C for 15 minutes and then allowed to stand for 60 minutes; (iii) The solution after step (ii) standing still is separated into the lower raffinate phase and the upper extract phase, and gas chromatography is used to analyze the content of phenolic substances in the raffinate phase to obtain crude phenol.
[0028] (2) Preparation of water reducer: (i) Add 400 g of crude phenol obtained in step (1) and 45 g of para-sodium to water in sequence, then add 0.8 g of caustic soda until the pH value of the mixture is adjuste...
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