12 results about "Chemical pulping" patented technology

The invention relates to a chemical pulping, cooking and washing control method based on an ACE technology and a storage medium, the method comprises the following steps: collecting process parameter data of a chemical pulping, cooking and washing process, the process parameter data comprising cooking temperature, cooking pressure, pH value, cooking time, liquid ratio, additive concentration, steam flow and liquid level; preprocessing the collected process parameter data, wherein the preprocessing comprises data screening and data filtering; identifying time delay among the process parameter data in the chemical pulping, cooking and washing process; constructing a high-precision multivariable model, and capturing strong nonlinearity and coupling among process parameter data in the chemical pulping, cooking and washing process; and generating an optimal adjustment strategy of the process parameter data of the required target through the multivariable prediction control model. And the influence of single variable adjustment on other variables is avoided, so that the large loss of the production process in the aspects of yield, quality and energy consumption is reduced.

The invention relates to an energy-saving and emission-reducing production process and process method for alkaline chemical pulping, which belongs to the technical field of pulping, cooking and washing, and adopts the technical scheme that a dipping pot, a cooking pot, a pulp washing pot, a washing tank and the like are connected with a pulp pump, a valve and a pipeline through a vacuum and compressed air system; the method has the beneficial effects that the high-concentration and high-temperature black liquor is directly extracted from the steamer and sent to the alkali recovery evaporation section, the black liquor is firstly reduced to the temperature required by evaporation through flash evaporation, and secondary steam is reused for production, so that the evaporation steam consumption is greatly reduced; the steam produced by alkali recovery can meet the requirements of evaporation, causticization and cooking, and the residual steam can be used by other workshops; real zero emission of bamboo and wood pulping wastewater is realized, and ultralow emission of straw pulping wastewater is realized; the amount of water for washing the bamboo wood pulp is 0 (clear water), and the amount of water for washing the straw pulp is ultra-low; the two problems of water pollution and high energy consumption of alkaline pulping are solved satisfactorily.

The invention relates to a method for detecting the settling rate of a steamed wood chip, and belongs to a method for detecting the performance of the wood chip in a chemical pulping process by taking the wood chip as a raw material in the field of pulping and papermaking. By detecting the steaming efficiency, wood can be sufficiently softened to a proper degree, and the water content of the wood can be adjusted; the steaming time can be reasonably controlled, and unnecessary energy consumption is reduced. And meanwhile, the situation that the subsequent pulping cooking effect is affected due to the poor wood chip sedimentation effect caused by too short steaming time can be avoided. After the steaming efficiency is accurately detected and optimized, the subsequent pulping section can be carried out more smoothly, and meanwhile energy consumption caused by excessive steaming can be avoided.

Methods and systems for preparing non-wood agricultural feedstock material for use as a pulp, and making a paper product therefrom. The method includes providing non-wood agricultural feedstock material (e.g., corn stover) that includes agricultural fibers, chemically pulping the agricultural fibers at a low temperature of less than 100° C., refining the agricultural fibers (either before or after cooking), and introducing the produced agricultural fiber pulp into a papermaking machine to make liner, medium, tissue, towel, cardstock or other paper product (e.g., tubes, cores, chipboard, grayboard, or other rigid container board). The agricultural pulp fibers can also be introduced into a molded pulp products manufacturing machine, to make egg cartons, molded paper plates, molded single use packaging, or the like.

The invention discloses a process for extracting bamboo fibers through a biological method and application of the process, and relates to the technical field of bamboo fiber extraction.The process comprises the following steps that firstly, ultrasonic treatment is conducted, specifically, bamboo wood is pretreated through ultrasonic waves, and fiber cell walls are displaced, deformed and fiberized through the cavitation effect; and secondly, biological treatment is conducted, specifically, white rot fungi, brown rot fungi or soft rot fungi are adopted for conducting biodegradation on the bamboo wood subjected to ultrasonic treatment, and the white rot fungi comprise phanerochaete chrysosporium. No chemical agent is added in the whole production process, black liquor pollution generated by traditional chemical pulping is thoroughly avoided, production water recycling is achieved, the water consumption is only 10% of that of a traditional chemical pulping process, emission of COD, BOD and suspended solids SS is avoided, lignin, starch and the like are decomposed into H2O and CO2 by fungi, and environmental pollution is avoided. And the waste residues can be used for preparing biochemical feeds, organic fertilizers and edible fungus base materials, so that resource utilization is realized.

Celluloses are taken from industrial trees by means of chemical pulp processing method which does not give damage to environment, and turned into fiber form, and fibers of industrial trees are turned into dental floss form. As said industrial tree; a kind of tree selected from beech tree, birch tree, poplar tree, elm and oak tree is used.

The present invention relates to a process for the extraction of valuable components from a tannin-rich bark raw-material, by carrying out an alkaline cooking step, followed by acid precipitation to separate the valuable components from the remaining bark pulp. The invention also relates to the use of said process on a bark side stream of a chemical pulping plant, whereby the liquor remaining after the extraction of the present process is returned to a stream of the wood pulping process, typically to a black liquor stream, while the spent pulp can be processed further, e.g. by bleaching to give dissolved pulp.

A method of producing high yield chemical cellulosic pulp includes: (a) chemically pulping wood chips to separate lignin and liberate cellulosic fibers from the wood chips to generate a cellulosic pulp; (b) washing and screening the pulp of step (a); (c) pre-treating the washed pulp with oxygen; (d) optionally washing the treated pulp of step (c); (e) bleaching the pre-treated pulp in an extended duration oxidative bleaching stage; (f) optionally washing the bleached pulp of step (e); and (g) optionally further oxidatively or reductively bleaching the bleached pulp in a shorter duration bleaching stage, wherein the bleached pulp is produced at a yield of greater than 60% based on the weight of the pulped wood chips (dry basis).

A method of purifying raw methanol obtained in chemical pulping, wherein heavy oil is admixed with the raw methanol to prevent precipitation, and the methanol mixture is distilled or evaporated to recover the methanol. The heavy oil is formed by mixing and heating raw methanol obtained from a side stream of chemical hardwood pulping with an acidic aqueous solution to vaporize low boiling point sulfurous compounds and provide acidified raw methanol. The acidified raw methanol is separated into a liquid top phase, a liquid aqueous middle phase, and a liquid bottom phase. The liquid bottom phase is extracted to obtain the heavy oil.

The invention relates to the field of bamboo resource utilization, and discloses a method for preparing cellulose nanofibers from fine components of bamboo pulp, the cellulose nanofibers and application of the cellulose nanofibers. The preparation method comprises the following steps: adding fine components of bamboo pulp into an acidic sodium chlorite solution for pretreatment to obtain a fiber raw material; adding the fiber raw material into anhydride for reaction; and washing and dispersing residues obtained by the reaction, and then carrying out mechanical treatment to obtain the cellulose nanofibers. The method provided by the invention is high in production efficiency and relatively low in energy consumption, the length-diameter ratio of the prepared cellulose nanofiber can reach 800-2000, and the problems that resources such as fine fibers and parenchyma cells are wasted after chemical pulping of bamboos, and the prepared cellulose nanofiber is poor in dispersity and stability and the like are solved.

The present application relates to the field of chemical pulping, and discloses a method for simultaneously preparing kraft pulp and phenolated lignin, and kraft pulp and phenolated lignin prepared by the method. The method for simultaneously preparing kraft pulp and phenolated lignin comprises the following steps: mixing wood fiber raw material, water and cooking reagent, and then adding phenol; after cooking, obtaining a mixture of residue and black liquor; collecting the residue to obtain kraft pulp; and collecting the black liquor and performing acid precipitation, and the obtained precipitate is phenolated lignin. The phenolated lignin prepared by the present application has a phenolic hydroxyl content of 3.5-6.0 mmol / g, the kraft pulp prepared has a kappa number of 23.0-110.0, a viscosity of 900-1350 mL / g, and a brightness of 12.0-30.0% ISO. The present application has a significant lignin modification effect while separating fibers, realizes efficient utilization of resources and reduction of environmental burden, and has high industrialization potential.