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condensate and evaporate the condensate, cool the concentrated solution to room temperature, filter, and collect sodium acrylate crystals and mother liquor. The mother liquor is returned to the evaporator, evaporated again, and the concentrated liquid with a specific gravity of 1.26 and the evaporation condensate are collected. The mass fraction of sodium acrylate in the concentrated liquid with a specific gravity of 1.26 is not higher than 31.2. Collect sodium acrylate crystals. Combine the evaporation condensate and dilute phase to form the treated acrylate wastewater.
[0044] The content of sodium acrylate in the treated acrylate wastewater is 2947mg/L, 0?amp; is 5344mg/L, and the biodegradability is 0.75. The sum of the removal rates of acrylic acid and sodium acrylate is 94.3, 0?amp; the removal rate is 95.7, the recovery rate of sodium acrylate is 91.1, and the purity of sodium acrylate is 94.8.