54results about How to "Reduce invalid decomposition" patented technology

A reducing and bleaching composition for decoloured waste pulp is prepared from sodium dithionite (5-15 wt.%), chelating agent (1.25-15), sodium carbonate or sodium hydroxide or their mixture (0.25-3) and water (79.5-93.5) through uniform mixing. Its bleaching method features that the stabilizer and said composition are cooperated, and the oil or solvent not dissolved in water is added to isolate air, so improving the stability of bleaching liquid, reducing consumption of sodium dithionite and improving bleaching effect. Its advantages include less damage to strength and opaqueness of paper fibres, less corrosion to pipeline, less pollution and low cost.

The invention provides a method for preparing ramie fibers through oxidation, degumming and repeated multiple-step feeding, which comprises three feeding processes and comprises the following specific steps: in the first feeding process, preparing a degumming solution from surfactant, a fiber expanding agent, peroxide stabilizer, a defoaming agent, sodium hydroxide, peroxide and water, mixing raw hemp of ramie and the degumming solution to form a degumming solution system, and heating to remove part of colloid; in the second feeding process 20-50 minutes later, adding peroxide and sodium hydroxide, and keeping the temperature to further remove the colloid; in the third feeding process 20-50 minutes later, adding peroxide, and further keeping the temperature until the reaction is finished and the colloid is completely removed; and finally, washing refined dried hemp fibers with clear water, oiling, drying, opening, and combing to obtain the prepared ramie fibers. The method provided by the invention overcomes the defects in the existing oxidation and degumming technology; a repeated multiple-step method is used, so that the reaction is uniform and moderate, the damage to the fibers caused by over too high initial concentration of initial concentration is reduced, and the quality of the refined dried hemp product is improved; and meanwhile, the ineffective decomposition of the peroxide and the consumption of the defoaming agent are reduced, thereby saving the cost.

The invention provides a low-noise multi-frequency ultrasonic chemical reactor, and belongs to the field of degradation-resistant industrial wastewater treatment. According to the low-noise multi-frequency ultrasonic chemical reactor, mainly, multiple kinds of ultrasonic generators with different frequencies are used for generating three kinds of ultrasonic waves with different frequencies in horizontal and vertical directions to form an ultrasonic irradiation net, and through arc surface-shaped focusing, the three kinds of ultrasonic waves with the different frequencies are subjected to a compounding superposition action to achieve a cavitation effect and mechanical strength more significant than those of unidirectional single-frequency ultrasonic wave irradiation. The low-noise multi-frequency ultrasonic chemical reactor is even in ultrasonic irradiation, low in noise, high in organic matter degradation rate and high in wastewater treatment efficiency.