Method for preparing acrylic acid from acrylate waste

The invention discloses a method for preparing acrylic acid by using acrylate waste. The raw material acrylate waste mainly comes from byproducts for producing polyesters, acrylics, amino acids and acrylamide products or residual monomers which do not react completely. The method mainly comprises the following steps: dissolving the acrylate waste in water, filtering out particulate matters and flocculent insoluble substances in the acrylate waste, and reacting with strong acid to obtain an acrylic acid dilute solution; and adding an auxiliary agent, and carrying out distillation and rectification to obtain high-purity acrylic acid. The added hydrophilic agent can destroy the strong hydrogen-bond interaction of water and acrylic acid and improve the relative volatility of water and acrylic acid; and the separated process water and the hydrophilic agent are completely recovered as solvents for recycling. Acrylic acid produced by the process can meet all acrylic acid application scenes. According to the method,