Process for producing (methyl) propenoic acid and/or (methyl) acrylate and apparatus thereof

To provide a (meth) acrylic acid and / or a (meth) acrylate production. The production of (meth) acrylic acid and / or a (meth) acrylate include basic solution was washed with means for their production, subsequently rinsed in a solvent, in order to remove (meth) acrylic acid and / or (A yl) generated during the production of acrylic polymers and precipitated solid substances.