Method for preparing lignin crude product and sugar liquid by utilizing pulping and papermaking waste liquid
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Embodiment 1
[0024] Effects of pH on Separation of Lignin from Mixed Liquor
[0025] Take 200ml of pre-hydrolyzed solution and 200ml of black liquor and mix evenly to obtain mixed solution I. Measure the pH of mixed solution I to obtain a pH value of 10.1;
[0026] Divide the mixed solution I into 8 parts on average, 1 part is not treated, and the other 7 parts are acidified with sulfuric acid to pH 2, 4, 5, 6, 7, 8, 9, stirred at 100r / min for 10min, 4000r / min Centrifuge for 10min, collect the supernatant and precipitate, and freeze-dry the precipitate. The results are shown in Table 1. The acid-soluble lignin content of the supernatant is measured by the filter paper method, and the acid-insoluble lignin content of the supernatant is measured by ultraviolet spectroscopy. The results are shown in figure 1 .
[0027] The output of lignin crude product under different pH in table 1
[0028] pH 10.1 9 8 7 6 5 4 2 Yield, g / L 0.2 2.1 13.0 18.8 21.7 24.9 26.5 27...
Embodiment 2
[0031] Effects of PAC and PEO Concentrations on Lignin Separation of Mixed Liquor
[0032] Take 200ml of pre-hydrolyzed solution and 200ml of black liquor and mix evenly to obtain mixed solution Ⅰ;
[0033] Divide the mixture I into 8 parts on average, one of which is left untreated, and then add PEO to the other 7 parts respectively, and then add PAC, the weight ratio of PEO and PAC is 1:9, so that the total concentrations of PEO and PAC are respectively 100, 200, 300, 400, 500, 600, 800mg / L, then acidified with sulfuric acid to pH 6, stirred at 100r / min for 10min, centrifuged at 4000r / min for 10min, collected the supernatant and precipitate, freeze-dried the precipitate, the result See Table 2, measure supernatant liquid acid-soluble lignin content with filter paper method, measure supernatant liquid acid-insoluble lignin content with ultraviolet spectrometry, the results are shown in figure 2 .
[0034] Table 2 The output of crude lignin products under different PEO and ...
Embodiment 3
[0038] Effect of activated carbon dosage on lignin separation of mixed liquor
[0039] Take 125ml of pre-hydrolyzed solution and 125ml of black liquor and mix evenly to obtain mixed solution Ⅰ;
[0040] Add PEO to the mixture I first, then add PAC, the weight ratio of PEO and PAC is 1:9, make the total concentration of PEO and PAC in it 300mg / L, then acidify with sulfuric acid to pH 6, stir at 100r / min for 10min , centrifuged at 4000r / min for 10min to obtain the mixed solution II;
[0041] Divide the mixed liquid II into 5 parts on average, 1 part is left untreated, and activated carbon is added to the other 4 parts, so that the content of activated carbon in them is 5, 10, 20, 30 g / L respectively, stirred at 80 r / min for 6 hours, and centrifuged at 4000 r / min 10min, collect the supernatant, measure the acid-soluble lignin content of the supernatant with filter paper method, measure the acid-insoluble lignin content of the supernatant with ultraviolet spectroscopy, the result...
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