| abstract |
An object of the present invention is to efficiently remove and remove impurities which are mixed in raw materials, and to produce a PBT raw material having a good color tone and a high-quality 1,4BG. The present invention relates to a step of removing a high-boiling component and/or a low-boiling component by distillation to remove a high-boiling component and/or a low-boiling component by removing a cell, a salt, and water from a fermentation medium, and/or converting an unsaturated compound into a hydrogenated product. In the step of the product, crude 1,4BG is obtained, and the side by distillation in the distillation step is used to obtain a method for producing 1,4BG. |