Recovery of low molecular weight compounds from alkaline pretreatment liquor via membrane separations

Abstract

Lignin is an abundant renewable resource that is a promising substrate for upgrading to fuels and chemicals. However, lignin-rich biorefinery streams are often physically and chemically complex, and could benefit...

Lignin alkaline oxidation using reversibly-soluble bases

“…This feature provides an opportunity to separate these monomers prior to oxidation, which may increase the total monomer yield available from biomass in the DMR-EH process. 67,68 In the absence of O 2 , degradation of the hydroxycinnamates is slower and monomers other than the hydroxycinnamates are produced in lower yields (Fig. S6 and Table S5†), consistent with previous reports that these monomers are released under alkaline conditions even without oxygen present.…”

Lignin conversion to β-ketoadipic acid by Pseudomonas putida via metabolic engineering and bioprocess development

“…The 100% yield observed here ( Fig. 6 ) counterbalanced the higher cost of LRCs [$0.90/kg; ( 57 )] compared to glucose [$0.32/kg; ( 58 )] such that the MSP of $2.01/kg is similar to that where glucose is the sole substrate [$1.94/kg, 40% yield; ( 32 )]. Still, the ratio between LRC and glucose and the price of glucose exhibit a linear impact on economics.…”

“…We focused the process modeling only on the bioconversion and downstream processing section such that the TEA and LCA results could directly inform efforts associated with the bioprocess. We modeled the LRC cost based on previous work for APL generation and p -coumarate and ferulate production through a molecular weight fractionation process using membranes ( 57 ). The bioprocess was modeled as an aerobic cultivation in a bubble column fed with LRCs and glucose followed by chromatographic separation of β-ketoadipate via simulated moving bed (SMB) chromatography and concentration via evaporation ( Fig.…”

“…Spectra were acquired with 2048 points and a spectral width of 12 parts per million (ppm) in the F2 (1H) dimension and 256 points and SW of 220 ppm in the F1(13C) dimension using a standard phase-sensitive, gradient-selected pulse sequence. All spectral processing used Mnova 14.2, and prior work was used for peak identification ( 57 , 75 ).…”

Bio-based platform chemicals synthesized from lignin biorefinery

“…128,129 They have also been applied in biorefinery processes, such as lignin separation and product separation. 130,131 Detailed information about product separation based on MST is dissected in section 6. In contrast to acid precipitation and solvent and H 2 O separation, lignin separation based on MST has the advantages of continuous operation, no demand for extra chemical agents, satisfactory ability to couple with other techniques, the possibility of acquiring a purer stream in terms of high value-added products, and no requirements of regulating pH and temperature.…”