Extraction of Wheat Straw with Aqueous Tetra-n-Butylphosphonium Hydroxide

Abstract

The stability of tetra-n-butylphosphonium hydroxide ([P 4444 (aq) was observed for fractionation of wheat straw, avoiding significant decomposition of the expensive phosphonium component. Herein, the possibilities for producing cellulose-rich fractions with reduced lignin contents and hemicellulose-rich extracts are discussed. A proposal is given for a full process cycle using [P 4444 ][OH] (aq) , where the phosphonium salt is used in fractionation and recovered by anion metathesis as a chloride salt. Although not demonstrated in this article, the chloride salt may be converted back to the hydroxide by means of, e.g., ion exchange.

Infrared-assisted extraction of salidroside from the root of Rhodiola crenulata with a novel ionic liquid that dissolves cellulose

“…Nowadays, it has been demonstrated that tetrabutylphosphonium hydroxide (TBPH) containing 30-50 wt% water could dissolve cellulose rapidly at ambient temperature (25 C). 13 Despite the extensive research on TBPH, 13,26,27 there is still a lack of information on practical issues related to their application as an extraction solvent for the extraction of bioactive substances from herb samples, such as their efficiency, optimal water content and so on. 13 Despite the extensive research on TBPH, 13,26,27 there is still a lack of information on practical issues related to their application as an extraction solvent for the extraction of bioactive substances from herb samples, such as their efficiency, optimal water content and so on.…”

The Effect of Additives on the Viscosity and Dissolution of Cellulose in Tetrabutylphosphonium Hydroxide

“…The excess of water‐coordinated [OH] − and of stabilizing phosphonium ions enables the additional dissolution of cellulose in the present cellulose/TBPH/water/solvent mixture, maximizing the amount of dissolved cellulose. [TBP] + can be recycled by an ion‐exchange method, as reported by Hyvakko, King, and Kilpeläinen . However, the addition of solvents to the cellulose solution may enhance the cost of separation.…”

Phosphonium salts and P-ylides

“…Magnusson and Kelland evaluated the synergism of five tetraalkylphosphonium bromide salts with N-vinylcaprolactam-based polymers as kinetic hydrate inhibitors and antiagglomerants. 124 The stability of aqueous [P 4444 ][OH] solutions and their potential for wheat straw extraction were investigated by Hyväkkö et al 125 3 Phosphonium-based ionic liquids (PILs)…”