Preparation of furfural using mixed solvents
AssigneeBASF SE
InventorsSunil Sadashiv Divekar, Pramod Shankar Kumbhar, Rahul Vasantrao Bagal, Amit Madanlal Katariya
Life of this patent
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Abstract
Processes for the preparation of furfural from a xylose containing feedstock and more particularly to an elevated temperature conversion of a xylose containing feedstock to furfural in acidic conditions are described. The described process uses a mixture of two solvents in which the humins are formed and solubilized. The described process is operated in continuous mode with no significant amounts of solid by-products formation.
Claims23
A process for converting xylose to furfural comprising:
- (a) providing a first stream comprising xylose obtained from an acid pre-treated lignocellulosic biomass;
- (b) adjusting pH of said first stream with a metal oxide or hydroxide forming a second stream;
- (c) mixing said second stream with isophorone or a mixture of at least one low boiling solvent and at least one high boiling solvent forming a third stream;
- (d) treating said third stream in a reactor at a temperature and pressure for a specific time period so as to cause a desired reaction forming a fourth stream;
- (e) separating said fourth stream into an organic stream and an aqueous stream;
- (f) adjusting pH of said organic stream by a base;
- (g) separating furfural as the product from a fraction comprising or consisting of humins and the at least one high boiling solvent or isophoron;
- and
- (h) recycling or recovering the at least one high boiling solvent or isophorone.
(canceled)
A process for the preparation of furfural from lignocellulosic biomass, the process comprising:
- (a) acid pre-treating the lignocellulosic biomass forming a first stream comprising xylose;
- (b) adjusting pH of said first stream with a metal oxide or hydroxide forming a second stream;
- (c) mixing said second stream with isophorone forming a third stream;
- (d) treating said third stream in a reactor at a temperature and pressure for a specific time period so as to cause a reaction forming a fourth stream;
- (e) separating said fourth stream into an organic stream and an aqueous stream;
- (f) adjusting pH of said organic stream by a base;
- (g) separating furfural as the product from a fraction comprising or consisting of humins and the isophoron;
- and
- (h) recycling or recovering the at least one high boiling solvent or isophorone.
(canceled)
(canceled)
Dependencies are inferred from the claim text.