Method for increasing content of phenol hydroxyl of lignosulfonate by ultrasonic waves and application
A technology of phenolic sulfonate phenolic hydroxyl group and lignosulfonic acid salt is applied in the field of improving the reaction activity of lignosulfonate, which can solve the problem of low content of phenolic hydroxyl group of reactive groups, limited application scope and use value, and unfavorable mass transfer. and reaction problems, to achieve the effect of short process route, significant ultrasonic effect, and reduction of process cost and equipment cost
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Embodiment 1
[0030] (1) Dissolve 5g of sodium lignosulfonate in 50ml of distilled water, then adjust the pH value to 0 with concentrated sulfuric acid solution with a mass percentage of 98%, and stir to fully disperse sodium lignosulfonate in the acidic aqueous solution to obtain lignin Sodium sulfonate solution.
[0031] (2) Treat the sodium lignosulfonate solution with 150W, 40kHz ultrasonic wave at 25°C for 60min, cool the ultrasonic reaction solution naturally, then remove the solvent by distillation under reduced pressure, and dry at constant temperature to obtain a dark brown sodium lignosulfonate ultrasonic sample. Taking the phenolic hydroxyl content as the standard, it is measured according to the ultraviolet differential spectroscopy (Arthur Wexler S. Analytical Chemistry, 1964, 36(1):213~221.). The phenolic hydroxyl content of lignosulfonate was 0.6553% before ultrasonication, and 1.5785% after ultrasonication, and the ultrasonic efficiency reached 141%.
Embodiment 2
[0036] (1) Dissolve 10g of sodium lignosulfonate in 100ml of distilled water, then adjust the pH value to 2 with concentrated sulfuric acid solution with a mass percentage of 98%, and stir to fully disperse sodium lignosulfonate in the acidic aqueous solution to obtain lignin Sodium sulfonate solution.
[0037] (2) Treat the sodium lignosulfonate solution with 150W, 40kHz ultrasonic waves at 25°C for 60 minutes, and cool the ultrasonic reaction solution naturally, then remove the solvent by distillation under reduced pressure, and dry at constant temperature to obtain a dark brown ultrasonic sodium lignosulfonate sample. Taking the phenolic hydroxyl content as the standard, it is measured according to the ultraviolet differential spectroscopy (Arthur Wexler S. Analytical Chemistry, 1964, 36(1):213~221.). After ultrasonication, the phenolic hydroxyl content of lignosulfonate increased from 0.6553% to 1.5539%, and the ultrasonic efficiency reached 137%.
Embodiment 3
[0042] (1) Dissolve 10g of sodium lignosulfonate in 100ml of distilled water, then adjust the pH value to 2 with concentrated hydrochloric acid solution with a mass percentage of 37.5%, and stir to fully disperse sodium lignosulfonate in the acidic aqueous solution to obtain lignin Sodium sulfonate solution.
[0043] (2) Treat the sodium lignosulfonate solution with 150W, 40kHz ultrasonic waves at 30°C for 60 minutes, and cool the ultrasonic reaction liquid naturally, then remove the solvent by distillation under reduced pressure, and dry at constant temperature to obtain a dark brown sodium lignosulfonate sample. Taking the phenolic hydroxyl content as the standard, the phenolic hydroxyl content of lignosulfonate after ultrasonic measurement was increased from 0.6553% to 0.9166% by ultraviolet differential spectroscopy (Arthur Wexler S. Analytical Chemistry, 1964, 36(1): 213-221.) , the ultrasonic efficiency is 39.9%.
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