7results about "Cellulosic pulp after-treatment" patented technology

A system for mixing a treatment medium into a slurry includes: a mixer configured to mix the slurry and the treatment medium; a plurality of walls defining a plurality of channels; a slurry source fluidly coupled to each of the channels; and a treatment medium source providing a portion of the treatment medium to each of the channels. The mixer includes a mixing chamber, a mixer inlet fluidly coupled upstream of the mixing chamber, and a mixer outlet fluidly coupled downstream of the mixing chamber. Each of the channels is fluidly coupled to the mixer inlet. The slurry source provides a portion of the slurry to each of the channels. Each of the channels provides that portion of the slurry and that portion of the treatment medium to the mixer inlet.

The present invention relates to a method for manufacturing a cellulose pulp composition for a moldable cellulose fiber-based web, said method comprising: a) providing a cellulose pulp composition comprising at least 50 wt% chemical or semi-chemical wood pulp based on dry weight, b) subjecting the cellulose pulp composition provided in step a) to low consistency (LC) refining at a consistency in the range of 1-7 wt% to an SR value in the range of 18-50 as determined by standard ISO 5267-1, c) subjecting the LC-refined cellulose pulp composition obtained in step b) to high consistency (HC) refining at a consistency in the range of 12-40 wt% with a refining energy of at least 150 kWh / t, and d) diluting the HC-refined cellulose pulp composition obtained in step c) to a consistency in the range of 0.1-10 wt%. The invention further relates to a method for manufacturing a moldable cellulose fiber-based web and a method for manufacturing a molded cellulose fiber-based product.

The present invention relates to a method of treating biomass, comprising providing a lignocellulosic biomass feedstock; contacting the biomass feedstock in a mixture, which is formed by the biomass, water and an alkaline agent, with an oxidizing agent at an elevated temperature; and continuing the contacting of the biomass feedstock with the oxidizing agent until a notable part of the lignin is solubilised. The step of providing the biomass feedstock comprises contacting a biomass raw-material containing cellulose, hemicellulose and lignin in an aqueous phase with an alkaline agent; continuing the contacting of the biomass with the alkaline agent until a significant portion of the hemicellulose is dissolved in the aqueous phase to provide a modified biomass; recovering the modified biomass; optionally opening the structure of the modified biomass by mechanical treatment; and using the modified biomass as a lignocellulosic biomass feedstock. Treating the biomass provides hemicellulose, lignin and cellulose fractions that have a multitude of applications in the bioeconomy.

According to an example aspect of the present invention, there is provided a method comprising treating a composition comprising paper-grade pulp with ozone to adjust intrinsic viscosity of the paper-grade pulp to below 550 ml / g The paper grade-pulp comprises at least 10 wt-% of hemicellulose of the dry weight of the paper-grade pulp, and the pH of the composition is at least 5.5 at the beginning of the treatment.

This utility model relates to a white pulp production system for A3 grade kraft paper, comprising: a chain conveyor for conveying white pulp residue recovered from a wastewater treatment plant to a pulper; a pulper for pulping the white pulp residue conveyed by the chain conveyor and then sending it to a high-consistency desander; a high-consistency desander for removing desander from the pulper and then sending it to a discharge pulp tower; a discharge pulp tower for storing the pulp after desandering by the high-consistency desander; a discharge pump for sending the pulp in the discharge pulp tower to a low-consistency desander; a low-consistency desander for removing desander from the pulp conveyed by the discharge pump and then sending it to a thermal dispersion system; a thermal dispersion system for thermally dispersing the pulp and then sending it to a medium-fiber storage tower; and a storage tower for storing the pulp after thermal dispersion treatment. By treating the white pulp residue recovered from the paper mill wastewater treatment plant, it can replace domestic waste white pulp, optimize the process flow, and reduce raw material costs.

This invention belongs to the field of comprehensive utilization of biomass resources and pulping and papermaking technology, and relates to a pulping method based on coconut shell raw materials and its application in the production of corrugated packaging materials. The method includes: processing coconut shell raw materials through a twin-screw extrusion and kneading process to obtain a mixture; obtaining coconut fiber components through multi-stage sieving; subjecting the coconut fibers to hot water or alkaline cooking; grinding with a high-consistency disc mill or defragmenting with a fiber delamination machine, and sieving to obtain coconut pulp. The obtained coconut pulp is mixed with recycled fiber pulp, chemical additives are added, and the mixture is then used to produce corrugated base paper or boxboard. This invention achieves efficient and clean separation of coconut shell fibers through a combination of twin-screw extrusion and kneading + pre-hydrolysis / alkaline cooking + high-consistency refining / defragmentation processes, resulting in high pulp yield, good fiber morphology, and a maximum ring crush index of 8.3 N·m / g and a maximum bursting index of 3.4 kPa·m. 2 / g, opening up a new source of low-cost, renewable fiber raw materials for the pulp and paper industry.

This invention provides a method for processing raw materials for enzymatic hydrolysis to produce lignocellulose, comprising the following steps: (1) heat-treating the lignocellulose-containing raw material; (2) selectively oxidizing and refining the heat-treated raw material; and (3) drying the selectively oxidized and refined raw material. This invention can increase the porosity of lignocellulose without increasing the refining intensity, and reduce pore closure caused by cellulose cutinization during the drying process after refining. It can produce lignocellulose materials with higher porosity, thereby producing lignocellulose materials with higher accessibility and reactivity.