Bitumen compositions comprising lignin
A composition and lignin technology, applied in the field of providing such compositions, polymer modified asphalt, can solve the problems of increasing needle penetration resistance, etc.
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Embodiment 1
[0450] Example 1 - Lignin Production
[0451] Information on the different lignin products and their sources is listed in Table 1. Indulin AT is a commercial product from the kraft pulping process. Other lignin products were produced at the DONGEnergy Inbicon pilot plant by first using water (for F3, F4, V2 and V3) at pH around 6 or with H 2 SO 4 Aqueous soaking of wheat straw to 40% TS at pH 1.5 ± 0.1 (for A) followed by hydrothermal pretreatment under suitable process conditions (150-200°C for 15-30 min in this case) to obtain The amount of xylan required. The amount of xylan indicating the intensity of pretreatment is given in Table 1. For samples V2 and V3, the pretreatment was milder than F3 and F4. For V2 and V3, pretreatment was followed by a solid / liquid separation ("C5 bypass"), in which the solid fraction was subjected to enzymatic hydrolysis, in contrast to the liquid fraction bypassing this step. For V2 and V3, the liquid fraction was recombined with the enzy...
Embodiment 2
[0452] Embodiment 2-CHN and XRF analysis
[0453]For CHN analysis, 1 mg of dry sample was weighed in a tin cannula and analyzed for C, H and N content in a Eurovector EA3000 CHN analyzer with thermal conductivity detector (TCD). A standard curve for acetanilide was used as a model compound to quantify the signal. O content was calculated by subtracting the content of C, H, N and ash from 100%. X-ray fluorescence spectroscopy (XRF) was used to quantify the content of Mg, Al, Si, P, S, Cl, K, Ca and Fe. A 4 gram dry lignin sample was pelletized in a Specac Atlas Manual 25T hydraulic press at 20 tons of pressure and analyzed in a Rigaku Supermini 200. Results analyzed using CHN or C 6 h 8.4 o 35 (representing the average chemical formula for that type of sample) to balance the XRF output calculations. The results from the lignin product analysis are shown in Table 2.
Embodiment 3
[0454] The preparation of embodiment 3-modified asphalt
[0455] Bitumen (330 / 430) supplied by Nynas A / S (Denmark) was heated to 180°C using a glycerol bath. Add the desired amount of SBS (polystyrene-polybutadiene-polystyrene block copolymer, 30% w / w styrene; CAS number: 9003-55-8; Sigma-Aldrich) to the bitumen And let stand for 15 minutes until the SBS warms up. Homogenization was performed using an IKA T25 Ultra Turrax (S25N-18G dispersing element) by gradually increasing the stirring rate (5000 rpm for 10 minutes, 10000 rpm for 20 minutes, 15000 rpm for 20 minutes). The homogenized pitch was aliquoted into 20 mL glass scintillation vials (10 g each), lignin was added (final concentration 10% (w / w)) and dispersed using an Ultra Turrax (10000 rpm, S25N-10G; 10000 rpm, dispersing element as close to the bottom of the vial as possible) homogenize for 10 minutes. No lignin was added to the negative control group.
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