The present invention provides processes for recovering ditrimethylolpropane from a still residue obtained by extracting and then distilling off trimethylolpropane from a reaction solution obtained by reacting n-butyraldehyde with formaldehyde in the presence of a basic catalyst. One process comprises acid decomposition of formals in the still residue. A second process comprises removal from the still residue of components having a higher boiling point than that of ditrimethylolpropane followed by crystallization of the resultant product.
