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1148results about "Cellulose treatment using microorganisms/enzymes" patented technology

Method for the manufacture of microfibrillated cellulose

A method for treatment of chemical pulp for the manufacturing of microfibrillated cellulose includes the following steps: a) providing a hemicellulose containing pulp, b) refining the pulp in at least one step and treating the pulp with one or more wood degrading enzymes at a relatively low enzyme dosage, and c) homogenizing the pulp thus providing the microfibrillated cellulose. According to a second aspect of the invention a microfibrillated cellulose obtainable by the method according to the first aspect is provided. According to a third aspect of the invention, use of the microfibrillated cellulose according to the second aspect in food products, paper products, composite materials, coatings or in rheology modifiers (e.g. drilling muds) is provided.
Owner:STFI PACKFORSK AB

Pulp making technology through performing biological enzyme softening lignin removal twice combined with mechanical method

The invention provides a pulp making technology through performing biological enzyme softening lignin removal twice combined with a mechanical method. The pulp making technology comprises the following steps: step 1) material preparation; step 2) biological enzyme softening preimpregnation for the first time; step 3) mechanical pulp making and thread separation; step 4) biological enzyme softening lignin removal and bleaching for the second time; step 5) fine purification of made pulp. According to the pulp making technology disclosed by the invention, a composite permeating softener and a composite biological enzyme preparation are used for performing the preimpregnation working procedure and the bleaching working procedure, and a new pulp making technology through biological enzyme softening lignin removal twice combined with the mechanical method is obtained. According to the pulp making technology disclosed by the invention, the conventional alkaline pulp making technology, the conventional mechanical pulp making technology and the biological pulp making technology which is in the process of exploration are changed, so that the defects of conventional pulp making technologies are overcome, the method is simple and effective, the pertinence is high, the maneuverability is high, high-temperature cooking is not needed in the lignin degradation process, hazardous substances such as caustic soda are not added, and black liquor is not produced.
Owner:上海锴晨实业有限公司

Bamboo chemimechanical pulp bioenzyme pretreatment method

The invention discloses a bamboo chemimechanical pulp bioenzyme pretreatment method. The bamboo chemimechanical pulp bioenzyme pretreatment method comprises the following steps: feeding bamboo pieces into a steaming cabin for normal-pressure pre-steaming after screening the bamboo pieces, and then carrying out first-stage screw extrusion; adding bioenzyme in an extruded material for pretreatment, then carrying out high-temperature deactivation, washing and dewatering, then carrying out first-stage and second-stage chemical pre-impregnating in sequence, then carrying out first-stage high-consistency normal-pressure pulp grinding by using a high-consistency disc refiner of which rho is 300, and completing bleaching reaction by enabling pulp to stay in a high-consistency reaction cabin for about 50 to 60 minutes; then carrying out follow-up pulp grinding by using a disc refiner, preparing pulp samples in different Canadian freeness degrees by controlling and inputting different pulp grinding energy consumptions, respectively recording the pulp grinding energy consumption needed for preparing each pulp sample, and using the different pulp samples for paper pulp performance testing after respectively carrying out latent elimination, acidification, washing, screening and dewatering concentration. According to the bamboo chemimechanical pulp bioenzyme pretreatment method disclosed by the invention, by carrying out pretreatment on bamboo bioenzyme, compared with a traditional PRC (Preconditioning Refiner Chemical)-APMP (Alkaline Peroxide Mechanical Pulping) technology, the difference in respects of pulp grinding energy consumption and pulp performance can be observed, and a reference technology is provided for preparing chemimechanical pulp by using bamboos as raw materials.
Owner:INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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