Azeotropic or azeotropic-like composition comprising hydrogen fluoride and 1,1,2-trifluoroethane, 1-chloro-2,2-difluoroethane, or 1,2-dichloro-1-fluoroethane

A separation method of a composition comprising hydrogen fluoride and at least one member selected from the group consisting of 1,1,2-trifluoroethane (HFC-143), 1-chloro-2,2-difluoroethane (HCFC-142), and 1,2-dichloro-1-fluoroethane (HCFC-141),

• the method comprising steps (a) and (b), and optionally further comprising steps (c) and (d):
• (a) supplying a composition comprising hydrogen fluoride and at least one member selected from the group consisting of HFC-143, HCFC-142, and HCFC-141 to a first distillation column;
• (b) obtaining, as a first distillate, an azeotropic or azeotrope-like composition comprising hydrogen fluoride and at least one member selected from the group consisting of HFC-143, HCFC-142, and HCFC-141, and extracting, as a bottom composition of the first distillation column, a composition that is more enriched in either i) at least one member selected from the group consisting of HFC-143, HCFC-142, and HCFC-141, or ii) hydrogen fluoride, in terms of the concentration, than the supplied composition;
• (c) supplying the bottom composition of the first distillation column to a second distillation column having a different operation temperature and/or operation pressure to perform distillation;
• and
• (d) if the composition extracted as the bottom composition of the first distillation column is more enriched in hydrogen fluoride in terms of the concentration than a supplied stream, extracting a stream having a richer hydrogen fluoride concentration as a bottom composition of the second distillation column, and if the composition extracted as the bottom composition of the first distillation column is more enriched in at least one member selected from the group consisting of HFC-143, HCFC-142, and HCFC-141 in terms of the concentration than the supplied stream, extracting a stream having a richer concentration of at least one member selected from the group consisting of HFC-143, HCFC-142, and HCFC-141 as the bottom composition of the second distillation column.