Hydrogen peroxide compositions for the delignification of plant matter, and uses thereof
A technology of hydrogen peroxide and composition, applied in the field of delignified plant matter, can solve the problems of environmental toxicity, deterioration of deforestation and the like
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Embodiment 1
[0137] Hydrogen peroxide compositions used in each test of Example 1:
[0138] Test 1: A commercially available aqueous hydrogen peroxide solution was used, consisting of 59% by weight of hydrogen peroxide and water made up to 100%. The phosphorous content in this solution is strictly below 5 ppm by weight based on the total weight of the solution, as measured by plasma torch spectroscopy (optical ICP).
[0139] Test 2: The same hydrogen peroxide solution as in Test 1 was used except that citric acid was added thereto in a proportion of 2000 ppm by weight based on the total weight of the solution.
[0140] Test 3: Using an aqueous hydrogen peroxide solution according to the invention comprising 49% by weight hydrogen peroxide and 130 ppm (expressed as phosphorus additive weight relative to solution weight) phosphorus additive. The phosphorus content in the solution was equal to 55 ppm by weight based on the total weight of the solution, measured by plasma torch spectroscopy (...
Embodiment 2
[0149] The products used are as follows:
[0150] - a commercially available aqueous hydrogen peroxide solution containing 49.5% by weight of H relative to its total weight 2 o 2 , measured by method CEFIC H2O2-AM-7157;
[0151] - Acetic acid (100% Analar Normapur acetic acid, VWR Prolabo);
[0152] - Formic acid (≥98% formic acid, Riedel de Haën, Sigma-Aldrich).
[0153] Series 1
[0154] A lignocellulosic pulp prepared as above was used, containing a dryness of 40%, having a kappa index equal to 28 measured according to standard ISO 302. It is recalled that the kappa index of pulp reflects the amount of lignin remaining in the pulp. The lower the index, the more delignified the pulp.
Embodiment 211
[0155] Embodiment 2.1.1 (according to the present invention)
[0156] 75 grams of lignocellulosic pulp were contacted at room temperature (20°C) with a solution containing 49.50 grams of pure formic acid, 90.75 grams of pure acetic acid and 24.75 grams of distilled water in a plastic bag which was then sealed. Shake (mix) by hand for 2 minutes.
[0157] at 60 kg H 2 o 2 The ratio per ton of dry pulp (i.e. solids per ton of pulp) is such that the obtained pulp is exposed for the first time (at time t=0 min) to 49.5% by weight of H at a temperature of 80 °C 2 o 2 aqueous hydrogen peroxide solution. The mixture was allowed to react for 20 minutes. at 20 kg H 2 o 2 Ratio per ton of dry pulp The pulp is contacted a second time (at time t=20 minutes) with the hydrogen peroxide solution at a temperature of 80°C. The mixture was allowed to react for 20 minutes. at 20 kg H 2 o 2 per ton of dry pulp is brought into contact with the hydrogen peroxide solution for the third tim...
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