Recovery of furfural and methanol from spent pulping liquors
Abstract
Abstract CHEMICALS, SUCH AS ACETALDEHYDE, ACETONE, ACETIC ACID, ETHANOL, FURFURAL, METHANOL, P-CYMENE AND SULFUR DIOXIDE, WHICH ARE PRODUCED DURING SULFITE PULPING AND SIMILAR OPERATIONS ARE RECOVERED BY TREATING LIQUORS AND CONDENSATES CONTAINING SAID CHEMICALS WITH STEAM IN A FRACTIONATING COLUMN. THE CHEMICALS ARE FURTHER SEPARATED BY REFLUXING THE MORE VOLATILE ORGANIC COMPOUNDS IN THE FRACTIONATING COLUMN TO RECOVER METHANOL FROM THE TOP OF THE COLUMN AND FURFURAL THEREBELOW. THE QUALITY OF THE RECOVERED CHEMICALS IS IMPROVED BY A PRELIMINARY STEAM TREATMENT OF THE LIQUORS AND CONDENSATES PRIOR TO THEIR INTRODUCTION INTO THE FRACTIONATING COLUMN TO RECOVER SULFUR DIOXIDE THEREFROM.
Inventors
- 👤 K Baierl
Bibliographic Details
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