Calix[4]arene derivative, non-phosphorus scale inhibition, dispersion and corrosion inhibition agent, preparation method and application
An aromatic hydrocarbon derivative, phosphorus-free scale inhibition technology, applied in the preparation of sulfonate, scale removal and water softening, chemical instruments and methods, etc. Scale and corrosion inhibition effects, reduction of eutrophication, and the effect of small usage
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[0047] Preparation of embodiment 1 calix [4] arene derivative
[0048] Step (1): Under nitrogen protection, add 1 g of calix[4]arene, 2 g of 2-chloroacetic acid, 50 mL of DMF, and 2 g of sodium hydroxide into a three-necked flask, and reflux for 24 h under magnetic stirring. Evaporate most of the solvent under reduced pressure, dissolve in ethanol aqueous solution, add dilute hydrochloric acid (5%) to acidify, obtain light yellow precipitate, filter with suction, and recrystallize the filter cake with chloroform-methanol mixed solution to obtain white powder.
[0049] Step (2): Add 1g of white powder and 2mL of concentrated sulfuric acid (70wt%) into a round bottom flask, and react at room temperature for 12 hours under stirring. Add 20mL of diethyl ether, a precipitate is formed, filter with suction, dissolve the filter cake with 20mL of water, and use BaCO 3 Neutralized to neutral; filter, and dry the filtrate to obtain a white solid, dissolve it with a small amount of hot ...
Embodiment 3
[0068] Accurately weigh 0.0050 g of the calix[4]arene derivative obtained in Example 1 (the content in water is 5 mg / L), 0.0022 g of zinc sulfate heptahydrate (the content of zinc ions is 0.5 mg / L), and dissolve them in 1 L of test water In 1, after the dissolution is complete, the corrosion inhibition rate and scale inhibition rate are measured. The measurement results are that the corrosion rate of carbon steel is 0.032mm / a, the corrosion inhibition rate is 96.4%, and the scale inhibition rate of calcium carbonate is 93.1%.
Embodiment 4
[0070] Accurately weigh 0.0050 g of the calix[4]arene derivative obtained in Example 1 (the content in water is 5 mg / L), 0.0022 g of zinc sulfate heptahydrate (the content of zinc ions is 0.5 mg / L), and dissolve them in 1 L of test water In 2, after the dissolution is complete, the corrosion inhibition rate and scale inhibition rate are measured. The measurement results are that the corrosion rate of carbon steel is 0.026mm / a, the corrosion inhibition rate is 96.7%, and the scale inhibition rate of calcium carbonate is 91.3%.
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