The multi-stage modular horizontal digester is primarily comprised of a single auger in a horizontal orientation. The single auger includes sections of lesser and greater inner diameter, thus creating sections of that allow for mixing and time to operate on the contents, and sections where the liquids are squeezed out. As compared to the known processing methodology, the multi-stage modular horizontal digester creates numerous benefits. For example, by maintaining elevation of the pulp, it can be directly expelled into the hydrapulper without the need for an additional pump. Processes can be changed quickly by altering the rotation speed, auger sections, or chemical inputs and outputs without the need to move heavy tanks or adjust pumps. In other words, there is no need for the standard cascade-style system where the pulp descends through a step, is raised to the next step, and so forth.

The present invention relates to a method for producing a denatured cellulose fiber cake including carrying out a solid-liquid separation of a dispersion containing denatured cellulose fibers under the conditions of a centrifugal force of a centrifuge of 50 G or more and 600 G or less (step A). According to the present invention, a new method for producing a resin composition containing denatured cellulose fibers, and a new method for producing a denatured cellulose fiber cake, a shortened anionically denatured cellulose fiber cake, modified cellulose fibers, or fine cellulose fibers which can be used therefor can be provided.

The present invention provides a process for biomasses. The process may include removing residual moisture from the biomass to provide dried biomass. The dried biomass may be subjected to a basic solution. The biomass may then be heated to a temperature of about 130° F. to about 150° F. for about 30 to 50 minutes. The biomass is then subjected to an oxidation agent for about 40 to 90 minutes. The biomass is then separated into a cellulosic pulp and an extract. The resulting pulp may then be subjected to the basic solution and oxidizing agent a second time. For the terrestrial-based biomasses, the resulting product may be separated into a cellulose rich dissolving grade pulp and an extract high in lignin. For the marine-based biomasses, the resulting product may be separated into a cellulosic-rich pulp and an extract high in sodium alginate.

The present invention provides a process for biomasses. The process may include removing residual moisture from the biomass to provide dried biomass. The dried biomass may be subjected to a basic solution. The biomass may then be heated to a temperature of about 130° F. to about 150° F. for about 30 to 50 minutes. The biomass is then subjected to an oxidation agent for about 40 to 90 minutes. The biomass is then separated into a cellulosic pulp and an extract. The resulting pulp may then be subjected to the basic solution and oxidizing agent a second time. For the terrestrial-based biomasses, the resulting product may be separated into a cellulose rich dissolving grade pulp and an extract high in lignin. For the marine-based biomasses, the resulting product may be separated into a cellulosic-rich pulp and an extract high in sodium alginate.

Pulps in accordance with certain embodiments include crosslinked cellulose fibers and have high brightness, reactivity, and intrinsic viscosity, and therefore can be well suited for use as a precursor in the production of low-color, high-viscosity cellulose derivatives. A method in accordance with the present technology includes forming a pulp from a cellulosic feedstock, bleaching the pulp, crosslinking cellulose fibers within the pulp while the pulp has a high consistency, and drying the pulp. Crosslinking the cellulose fibers can include exposing the fibers to a glycidyl ether crosslinker having two or more glycidyl groups and a molecular weight per epoxide within a range from 140 to 175. Another method in accordance with the present technology includes providing an aqueous suspension of pulp that includes chemical wood pulp fibers that were previously bleached and dried, crosslinking the fibers with such a glycidal ether crosslinker, and drying the pulp.

Pulps in accordance with certain embodiments include crosslinked cellulose fibers and have high brightness, reactivity, and intrinsic viscosity, and therefore can be well suited for use as a precursor in the production of low-color, high-viscosity cellulose derivatives. A method in accordance with the present technology includes forming a pulp from a cellulosic feedstock, bleaching the pulp, crosslinking cellulose fibers within the pulp while the pulp has a high consistency, and drying the pulp. Crosslinking the cellulose fibers can include exposing the fibers to a glycidyl ether crosslinker having two or more glycidyl groups and a molecular weight per epoxide within a range from 140 to 175. Another method in accordance with the present technology includes providing an aqueous suspension of pulp that includes chemical wood pulp fibers that were previously bleached and dried, crosslinking the fibers with such a glycidal ether crosslinker, and drying the pulp.

The present invention provides a method of producing an improved cellulose pulp consisting of cellulose fibers of a desired length, such as cellulose fibers having a length-weighted average fiber length Lc(l)>0.6 mm and its use in cellulose pulp-comprising products, such as packaging material with improved properties.

The present invention provides a method of producing an improved cellulose pulp consisting of cellulose fibers of a desired length, such as cellulose fibers having a length-weighted average fiber length Lc(l)>0.6 mm and its use in cellulose pulp-comprising products, such as packaging material with improved properties.

According to the present invention, there is provided a treatment process system for biomass material and methods for h such system. The system comprises a first dewatering stage arranged to receive biomass material, to remove liquid from the biomass material, and to feed the biomass material forward in the process. Further, the system includes a water treatment stage arranged to collect the removed liquid and an addition stage located downstream said dewatering stage and operatively coupled to the first dewatering stage. The addition stage is arranged to receive the de-watered biomass material, wherein the addition stage includes inlets for adding acid containing solution into the addition stage. A reactor stage arranged to receive the biomass material treated in the addition stage and to perform a pre-hydrolysis process to the biomass material. A filtrate feeding arrangement is arranged to feed liquid from the filtrate tank to the reactor stage.

A process for the isolation of lignin from black liquor and modification of lignin for use in many plastic applications is disclosed. The isolation of lignin consists of removing all of the non-lignin components from black liquor solution. The non-lignin components including but not limited to organic acids, sugars, and inorganic materials can be removed using either solvent extraction or ion-exchange resin or a combination of both methods. The isolated lignin is water soluble. The non-lignin components can be further isolated and sold or reused in the pulping or lignin isolation processes. The isolated lignin can be further modified in order to meet the needs of the desired plastic application.