4-(oxolan-2-yloxy)butan-1-ol

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: This second intermediate reaction product stream is then passed on through lines 20, 21, and 22 to third hydrogenation reactor 10. Additional hydrogen at an appropriate temperature can, if desired, be added from line 23 to the second intermediate reaction product mixture in line 21 in order to adjust the temperature of the resulting stream prior to entry to third hydrogenation reactor 10. This third hydrogenation reactor 10 contains a charge 24 of the manganese promoted copper hydrogenation catalyst DRD92/89A which is also available from Kvaerner Process Technology Limited. This catalyst is highly active for the conversion of the remaining dimethyl succinate but exhibits the surprising result that the content of the cyclic acetal, i.e. 2-(4′-hydroxybutoxy)-tetrahydrofuran, in the final product stream in line 25 is much reduced compared with the content of this compound in the second intermediate reaction product stream in line 19. This second intermediate reaction product stream be added from line 23 to the second intermediate reaction product mixture in line 21 in order