Wastewater treatment method
A waste water treatment and waste water technology, applied in water/sewage treatment, natural water treatment, extraction water/sewage treatment, etc., can solve the problems of high production cost of UV-curing monomers and difficult waste water treatment.
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[0021] The embodiment of the present application provides a wastewater treatment method, such as figure 1 Shown, this preparation method comprises the steps:
[0022] S01: Collect waste water from the preparation of UV-curable monomers;
[0023] S02: adjusting the wastewater to be alkaline, and then performing concentration treatment to obtain a concentrated solution;
[0024] S03: adjusting the concentrated solution to be acidic, and then adding a solvent for extraction treatment to obtain an upper layer extract and a lower layer raffinate;
[0025] S04: using the upper layer extract to prepare the UV-curable monomer.
[0026] The wastewater treatment method provided by this application is to treat the wastewater generated during the preparation of UV-curable monomers. The wastewater generally contains raw materials for the preparation of UV-curable monomers such as acrylic acid. Therefore, in order to recycle well, this application first The wastewater collected above is ...
Embodiment 1
[0038] The preparation of UV curing monomer (tripropylene glycol diacrylate monomer, TPGDA) mainly has three steps in the process: esterification-washing-distillation and desolventization, as follows:
[0039] Esterification: 220 parts of polyol (tripropylene glycol), 180 parts of acrylic acid, 1 part of polymerization inhibitor (p-hydroxyanisole), 8 parts of catalyst (methylsulfonic acid), 1 part of hypophosphorous acid, solvent (cyclohexane or toluene) 100 parts, put into the reaction kettle according to the weight ratio, the theoretical excess of the raw material acrylic acid is 6-10%, and the temperature is raised to 90-120 ℃ to reflux the effluent to carry out the esterification reaction. When the acid value drops to the theoretical design value (20- 40mg KOH / g), the esterification reaction is over, and the temperature is lowered to below 70°C to obtain a primary esterification liquid.
[0040] About 40-60 parts of the esterification water brought out by the solvent durin...
Embodiment 2
[0044] A method for treating wastewater produced by UV-curable monomers, treating the wastewater in the production process of UV-cured monomers of the above-mentioned embodiment 1, comprising the steps of:
[0045] S01, 50 parts of esterification water, 60 parts of first washing waste water, 130 parts of second washing neutralization waste water and 60 parts of third washing extraction waste water are mixed by mass, then add 2 parts of sodium hydroxide to adjust the pH value, The pH of the test result is 9.2;
[0046] S02, put the mixture obtained in the previous step into the still, and vacuumize at a temperature of 90°C and a pressure of -0.07MPa. After 3 hours, take a sample to detect the solid content of the mixture in the still, and the result is 44.4%. Cool down to 40°C, turn to Feed to washing tank A;
[0047] S03, add 30 parts of hydrochloric acid to the mixture in the washing kettle A to adjust the pH value, and the measured pH value is 2.7, then add 40 parts of cycl...
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