| abstract |
(57) [Problem] To stabilize viscous and difficult-to-handle waste oil (distillation residue oil, etc.) generated during the production of (meth) acrylic acid or its ester, withdraw it from the production equipment, and send it by pump And a method for easily and stably performing transfer by a pipeline, storage in a tank, and the like. A waste oil is handled in the presence of a solvent, typically at least one selected from water, alcohols, ethers, carboxylic acids, ketones, aliphatic hydrocarbons and aromatic hydrocarbons. |