Method for simplifying rectification process for preparing ethanol through hydrogenation of acetic acid

The invention discloses a method for simplifying a rectification process for preparing ethanol through hydrogenation of acetic acid. An extractive distillation mode is adopted, and an ethanol product with higher purity can be obtained; a rectifying device can meet the separation requirement on an acetic ether product and an ethanol product; in addition, the acetic ether and the ethanol are separated by the same separation equipment; when the ethanol is produced, crude acetic ether and absolute ethanol products are obtained in the device, and when the ethanol is not produced, the device can produce the qualified acetic ether product, so that the device investment is saved.