44results about How to "Reduce Bleaching Costs" patented technology

The invention discloses a bleaching agent for polyesteramide and spandex blended fabrics and a bleaching method thereof. The bleaching agent is prepared by compounding one of hydrogen peroxide, formic acid, and acetic acid, a surfactant, and an activator; then adding a bleaching aid (sodium pyrophosphate), preparing a water solution of the bleaching agent, adding polyesteramide and spandex blended fabrics to be bleached, carrying out oxidation bleaching; taking out bleached sample, carrying out neutralization, removing acid, washing, carrying out enzyme washing and water washing, and drying to obtain a sample with satisfied whiteness. Hydrogen peroxide / formic acid / acetic acid and some additives are used to bleach polyesteramide and spandex blended fabrics; hydrogen peroxide has a good bleaching effect on polyesteramide and spandex blended fabrics; the damage to the polyesteramide and spandex blended fabrics during the bleaching process is reduced; the yellowing of spandex in chlorine bleach is avoided; the CIE whiteness of bleached fabrics is more than 45; the strength loss is less than 20%; and the processing requirements of white, light color, and color sensitive fabrics can be satisfied.

The invention belongs to the technical field of bamboo wood dissolving pulp, and particularly relates to a preparation method for the bamboo wood dissolving pulp, which comprises the following preparation steps: (a) preparing a material; (b) cooking; (c) screening; (d) washing; (e) bleaching; and (f) manufacturing paper with the pulp. By adopting the preparation method for the bamboo wood dissolving pulp, the production efficiency and the product quality can be improved, simultaneously, the energy consumption, the chemical consumption and the pollution load are reduced, and the prepared bamboo wood dissolving pulp has high quality and high quality.

The invention discloses a method for reducing oxalate radicals formed in an oxygen delignification process. The method is characterized by comprising the following steps: (1) ultrasonically processing sodium phytate: adding sodium phytate into paper pulp, controlling pulp concentration at 5%-15%, uniformly mixing and then ultrasonically processing and washing after the ending of processing; (2) oxygen delignification: adding sodium hydroxide and magnesium hydrate into the pulp after being processed, controlling the pulp concentration at 5%-15%, performing oxygen delignification, and then washing. The sodium phytate adopted in the method is an important pure natural green additive, has strong chelation effect with metal ions and has the advantages of economic and environment-friendly effects, simplicity in operation and high pulp whiteness after bleaching. The oxygen delignification for the pulp according to the method can increase the whiteness of the pulp, can reduce the forming of the oxalate radicals in the oxygen delignification process and can reduce the pollution load of the oxygen delignification wastewater.

The invention belongs to the technical field of the preparation of dissolving pulp, in particular to an alkaline bleach liquor extraction process of bamboo wood dissolving pulp, which comprises the following steps: A. washing and concentrating pulp bleached by chlorine dioxide, adding 1.2-1.8% of caustic soda, and adjusting the PH value of the pulp to be 10.5-11.0; B. after adjusting the PH value, feeding the pulp into a medium-concentrated stand tube, and adding 3-5kg / admt hydrogen peroxide; C. sending the pulp from the medium-concentrated stand tube into a medium-concentrated mixing device, and adding 3-5kg / admt of oxygen; D. sending the pulp from the medium-concentrated mixing device into an upflow tower, and then overflowing into a downflow tower, and the retention time of the pulp in the upflow tower and the downflow tower is for 75-100min, and the temperature is 80-85 DEG C; and E, pumping the pulp from the downflow tower to a pulp washing machine to wash and concentrate for standby. The alkaline bleach liquor extraction process disclosed by the invention has the advantages that the removal rate of residual lignin is high, the whiteness of the produced pulp is stable, the consumption of chemicals at a subsequent chlorine dioxide bleaching stage can be reduced, and the alpha-cellulose content in the pulp is improved.

The invention discloses a method for cleanly bleaching chemimechanical pulp. The method comprises the following steps of: firstly, bleaching with carbamide peroxide: adding magnesium sulfate, sodium silicate, EDTA (Ethylene Diamine Tetraacetic Acid) and carbamide peroxide in chemimechanical pulp, adjusting the concentration of paper pulp to 10-15 percent, feeding the paper pulp into a bleaching tower for bleaching and washing after the reaction is ended; and secondly, treating with xylanase: adjusting the pH value of the washed paper pulp to 6.0-7.0, then adding the xylanase, controlling the concentration of paper pulp to 8-12 percent, uniformly mixing, carrying out enzyme treatment and then washing. The carbamide peroxide adopted by the method disclosed by the invention is a novel paper pump bleaching agent and has the advantages of convenience in package and transportation, favorable stability, no addition of alkaline for bleaching, high whiteness of the bleached paper pulp and the like. When the method disclosed by the invention is used for cleanly bleaching the chemimechanical pulp, the whiteness and the whiteness stability of the paper pulp can be improved; meanwhile, the formation of oxalate in the bleaching process is reduced; and the pollution load of wastewater generated by bleaching is reduced.