The present invention concerns a process for recovering fermentation products present in a fermentation mash produced in a bioreactor (9), comprising a step a) in which a gas stream (15) is sent into the fermentation mash under pressure in order to entrain at least a portion of the products and produce a gas stream (16) which is enriched in fermentation products. The process comprises a step h) for storage of the fermentation gases and the gas stream which is sent to the step a) is constituted by the stored fermentation gases.

The present invention concerns a process for recovering fermentation products present in a fermentation mash produced in a bioreactor (9), comprising a step a) in which a gas stream (15) is sent into the fermentation mash under pressure in order to entrain at least a portion of the products and produce a gas stream (16) which is enriched in fermentation products. The process comprises a step h) for storage of the fermentation gases and the gas stream which is sent to the step a) is constituted by the stored fermentation gases.

The present invention relates to a method for preparing saturated C.sub.n- and C.sub.2n-alcohols, wherein the ratio of C.sub.n- to C.sub.2n-alcohols is controlled by a distillative separation of the aldehydes used.

The present invention relates to a method for preparing saturated C.sub.n- and C.sub.2n-alcohols, wherein the ratio of C.sub.n- to C.sub.2n-alcohols is controlled by a distillative separation of the aldehydes used.

The present invention relates to a method for preparing saturated C.sub.n- and C.sub.2n-alcohols, wherein the separation of the C.sub.n-alcohols and the C.sub.2n-alcohols is effected by means of at least one two-column system or by means of at least one dividing wall column.

The present invention relates to a method for preparing saturated C.sub.n- and C.sub.2n-alcohols, wherein the separation of the C.sub.n-alcohols and the C.sub.2n-alcohols is effected by means of at least one two-column system or by means of at least one dividing wall column.

The present invention relates to a method for preparing saturated C.sub.n- and C.sub.2n-alcohols, wherein the ratio of C.sub.n- to C.sub.2n-alcohols is controlled by the diversion of substreams in individual method steps.

The present invention relates to a method for preparing saturated C.sub.n- and C.sub.2n-alcohols, wherein the ratio of C.sub.n- to C.sub.2n-alcohols is controlled by the diversion of substreams in individual method steps.

A method for recovering mono-ethylene glycol from a mixture feed comprising bio-derived diols is disclosed. The mixture feed comprises mono-ethylene glycol in an amount of at least 80 weight-% of the total weight of the mixture feed. The method comprises: providing the mixture feed into a distillation column, wherein a distillation process is carried out, wherein the distillation column comprises at least 80 theoretical stages and wherein the mixture feed is fed into the distillation column at a point, which is at a height of 5-20% of the total height of the distillation column as calculated from the top of the distillation column, wherein the total height of the distillation column is determined based on the number of theoretical stages, and wherein the distillation process is carried out with a reflux ratio of 20-200; and recovering mono-ethylene glycol. Further is disclosed a distillation arrangement.

A method for recovering mono-ethylene glycol from a mixture feed comprising bio-derived diols is disclosed. The mixture feed comprises mono-ethylene glycol in an amount of at least 80 weight-% of the total weight of the mixture feed. The method comprises: providing the mixture feed into a distillation column, wherein a distillation process is carried out, wherein the distillation column comprises at least 80 theoretical stages and wherein the mixture feed is fed into the distillation column at a point, which is at a height of 5-20% of the total height of the distillation column as calculated from the top of the distillation column, wherein the total height of the distillation column is determined based on the number of theoretical stages, and wherein the distillation process is carried out with a reflux ratio of 20-200; and recovering mono-ethylene glycol. Further is disclosed a distillation arrangement.