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Hydrogen peroxide compositions for delignification of plant matter and uses thereof
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一种过氧化氢、组合物的技术，应用在脱木素的植物物质领域，能够解决环境有毒、恶化砍伐森林等问题
Inactive Publication Date: 2019-02-19
ARKEMA FRANCE SA
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Abstract
Description
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Problems solved by technology
The method of making pulp using wood as a raw material presents several ecological problems
The first problem arises from the fact that wood is an exhaustible and fragile natural resource, and the increasing consumption of paper made from wood risks further exacerbating deforestation practices
Another problem arises from the pulp manufacturing process itself, which uses chemical compounds such as chlorinated products (chlorine gas, chlorine dioxide), which generate emissions that are toxic to the environment
Method used
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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 CEFICH2O2-AM-7157;
[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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Abstract
The present invention relates to a system for delignification of plant matter impregnated with a solution of an organic acid selected from the group consisting of acetic acid, formic acid, propionic acid, butyric acid or mixtures of these acids, preferably a mixture of acetic acid and formic acid, comprising said plant matter and comprising A hydrogen peroxide composition of hydrogen peroxide and at least one phosphorus additive, said composition having a phosphorus content greater than or equal to 40 ppm expressed as the weight of elemental phosphorus relative to the total weight of said composition, the system being intended for use with Delignification of plant matter impregnated with a solution of an organic acid selected from acetic acid, formic acid, propionic acid, butyric acid or a mixture of these acids, preferably a mixture of acetic acid and formic acid, said plant matter being selected from straw and / or wood or derived Lignocellulosic pulp from straw and / or wood; the mass ratio of the organic acid solution expressed as weight of solution to plant matter expressed as weight of solids is 1.5:1 to 10:1, preferably 4:1 to 10:1. The invention also relates to the use of said system.
Description
technical field [0001] The present invention relates to the field of delignification of plant matter. In particular, the present invention relates to a first hydrogen peroxide composition for delignification of plant matter, to the use of such compositions for delignification of plant matter, and to a second hydrogen peroxide composition for use in the delignification of plant matter. Uses for delignification of substances. The invention also relates to the delignified plant matter thus obtained for the manufacture of paper, glucose, ethanol, xylitol, organic acids, aliphatic diacids or monomers for the manufacture of various polymers. [0002] According to certain embodiments, the present invention falls more particularly in the field of manufacturing and optionally bleaching pulp. Background of the invention [0003] Plant matter is mainly composed of cellulose, hemicellulose and lignin. [0004] Delignification of plant matter is a process involving the extraction and / ...
Claims
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Application Information
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