93983-16-5Relevant articles and documents
METHOD FOR PRODUCING DITRIMETHYLOLPROPANE
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Paragraph 0146; 0147; 0148; 0149; 0150, (2013/07/25)
The present invention provides a method for producing ditrimethylolpropane which is characterized by the following (1) and (2): (1) a distillation still residue separated from purified trimethylolpropane is subjected to re-distillation under specific conditions to obtain a ditrimethylolpropane-containing solution having given contents of bis-TMP and tri-TMP; and (2) when subjecting the ditrimethylolpropane-containing solution to crystallization with an organic solvent, the crystallization is initiated under pressure at a temperature exceeding a boiling point of the organic solvent as measured under normal pressures, and the resulting crystallization product solution is cooled at a temperature drop rate of 2° C./min or less. According to the above method, it is possible to produce a high-purity ditrimethylolpropane from a distillation still residue obtained upon production of trimethylolpropane in a simple, industrially useful manner.
Process for recovering ditrimethylolpropane
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Page 7, (2008/06/13)
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.