7 results about "Alpha-Cellulose" patented technology

The invention discloses a method for cleanly preparing dissolving pulp based on waste cotton textiles, and belongs to the technical field of textile recovery and green chemistry. The preparation method comprises the following steps: taking betaine as a hydrogen bond acceptor, taking organic acid as a hydrogen bond donor, and adding a certain proportion of deionized water to construct a hydrated ternary eutectic solvent system; the pretreated waste cotton fabric is placed in the ternary eutectic solvent system to be subjected to depolymerization treatment, the solvent can be recycled after being blended, then refining treatment is carried out, and finally the regenerated dissolving pulp is obtained. The obtained regenerated dissolving pulp has the following performance indexes: the polymerization degree is 500-700, the alpha cellulose content is more than or equal to 97%, the whiteness is more than or equal to 84%, the iron content is less than or equal to 20ppm, and the fiber length is 26-32%. The method is mild in process condition, simple and convenient to operate, low in energy consumption, recyclable in solvent and free of high-alkali waste liquid, conforms to the green chemistry principle, and provides an economic and environment-friendly effective way for high-valued resource utilization of the waste cotton textiles.

The invention relates to the technical field of viscose fiber preparation, and particularly discloses a wood-source type flat cellulose short fiber and a production method thereof.The wood-source type flat cellulose short fiber comprises a spinning solution, the spinning solution is subjected to spinning and aftertreatment in an acid bath through a tantalum nozzle with flat spinneret orifices, and the flat cellulose short fiber is prepared. The spinning solution comprises the following raw materials: 8.8-9.2% of alpha cellulose, 4.8-5.2% of alkali liquor and the balance of a pretreated lignocellulose raw material, the spinning solution mainly comprises the alpha cellulose, the alkali liquor and the pretreated lignocellulose raw material, and then the spinning solution is subjected to spinning and post-treatment in an acid bath through a tantalum nozzle to prepare the flat cellulose short fiber. The tantalum nozzle with the flat spinneret orifices is adopted, so that the production cost is reduced, the service life of the nozzle is prolonged, and meanwhile, the flatness rate of the fibers is larger than or equal to 95%.

The present disclosure relates to a biodegradable geotextile structure for soil biostimulation comprising a woven fabric structure of hydrophilic filament yarns of a cellulose fiber selected from the list consisting of: alpha cellulose, beta cellulose, gamma cellulose or mixtures thereof; at least a plant-based biopesticide selected from the list consisting of: Nicotine, Rotenone, Pyrethrins I, Pyrethrins II, Eugenol, Citronella oil, and mixtures thereof; at least a microalgae selected from the list consisting of: Chlorella spp., Scenedesmus spp, Dunaliella spp, Spirulina spp., and mixtures thereof. Furthermore, the present disclosure relates to a method to obtain said biodegradable geotextile structure.

The invention discloses a method for preparing high-purity bleached broad beans from agriculture and forestry'three residues'. The method comprises the following operation steps: S1, raw material screening: selecting'three residues' meeting requirements; s2, chipping is conducted, specifically, after peeling, chipping and screening are conducted, sheets meeting the requirements are classified and piled up; s3, washing with water; s4, cooking: removing hemicelluloses and lignin in the sheets by adopting a vapor phase prehydrolysis sulfate cooking method; s5, pulp screening; s6, oxygen dealkalization: adding a certain amount of oxygen dealkalization into the collected material to carry out oxygen dealkalization reaction; s7, bleaching: bleaching the material obtained after the oxygen removal reaction; and S8, sheet making and whiteness and alpha cellulose detection: the product with the whiteness stabilized at 90% ISO or above and the alpha cellulose content controlled at 90% or above is the final product. According to the method disclosed by the invention, by carrying out physical property analysis and chemical component optimization on the cutting residues, the material-making residues and the processing residues, an efficient pulp screening, oxygen removal and multi-section bleaching process is developed, and the whiteness and the purity of the pulp are remarkably improved.

The present application relates to the technical field of dressings, in particular to a composite dressing patch based on glucomannan and a preparation method thereof. First, glucomannan is compounded with alpha cellulose, so that the structural functional group -OH on the alpha cellulose chain and the hydrogen bond network formed by the glucomannan in water act, the functional group -OH extends outward along the cellulose molecular structure, thereby realizing that the cellulose molecules are inserted in the glucomannan network structure, and the mechanical strength of the glucomannan hydrogel is enhanced. Secondly, amino beta cyclodextrin treated by amino functionalization is selected and grafted to the functional group -OH of the glucomannan and alpha cellulose through citric acid. Finally, the drug curcumin is dispersed in the mixed solution. Since the beta-cyclodextrin has a hydrophobic cavity, it can load the hydrophobic curcumin through host-guest interaction, thereby preparing a dressing patch with good sustained release effect and moisturizing effect.

The application provides a preparation method of a dissolving pulp for lyocell fibers, and belongs to the technical field of pulp refining of artificial fibers. The bleached chemical pulp is used as raw material, and the bleached chemical pulp is treated with an acid solution and a chelating agent in sequence, so that metal ions can be effectively removed; the pulp is pretreated by mechanical beating and hemicellulase treatment to obtain modified pulp; and the modified pulp is treated with an NMMO solution, so that hemicellulose in the modified pulp can be removed. The preparation method provided by the application is a green method with solvent recycling and recycling, the prepared pulp has low metal ion content, high alpha cellulose content, low hemicellulose content and high pulp yield. The main solvent NMMO used in the application is the same as the solvent used in the existing lyocell fiber production process, and can be effectively combined with the existing process route, and has the application prospect of industrialization and large scale.

The present invention relates to the technical field of cotton pulp production, and particularly to a preparation method of cotton pulp with a high content of alpha cellulose. The present invention obtains the finished cotton pulp through processes such as raw material selection, cotton opening, dry impurity removal, hot water extraction of hemicellulose, cooking for selective delignification and hemicellulose removal, pre-sand removal, pre-beating, concentration, hydrogen peroxide bleaching, acid treatment, post-sand removal, post-beating, pulp making. By adopting the hot water extraction technology for hemicellulose removal, hemicellulose is selectively removed, and the content of alpha cellulose is increased. By adopting the cooking technology for selective delignification and hemicellulose removal, pure cotton cellulose is further refined and the content of alpha cellulose is increased. The content of alpha cellulose in the cotton pulp is ≥98%. The prepared cellulose ether has a uniform degree of substitution, stable viscosity, and good compatibility, improving the quality of the cellulose ether.