59results about How to "Shorten bleaching time" patented technology

The invention relates to an open-width cotton-knitted cloth refining and bleaching combination machine. The open-width cotton-knitted cloth refining and bleaching combination machine is characterized by comprising a cold heap processing cloth feeding frame, a cold heap processor, a cold heap processing cloth discharging frame, a dipping mill, a steamer, a four-wheeled drum washing machine, a mangle device, a post-processing cloth feeding frame and a post-processing cloth discharging frame. The cold heap processing cloth feeding frame is arranged in front of the cold heap processor. The cold heap processing cloth discharging frame is connected behind the cold heap processor. The post-processing cloth feeding frame is connected behind the cold heap processing cloth discharging frame. The dipping mill, the steamer, the four-wheeled drum washing machine, the mangle device and the post-processing cloth discharging frame are sequentially connected behind the post-processing cloth feeding frame. The open-width cotton-knitted cloth refining and bleaching combination machine has the advantages of being capable of lowering energy consumption, shortening bleaching time and improving bleaching efficiency.

The invention discloses a method for preparing high-activity double-effect seed crystals from an intermediate product, namely metatitanic acid, of titanium dioxide. The method comprises the following steps of: with metatitanic acid as a raw material, preparing clear titanium sulfate liquid, cooling the clear titanium sulfate liquid, adding a diluent of the clear titanium sulfate liquid to alkaline liquor, controlling pH value to 7.5-9.0, filtering and washing the obtained product, carrying out secondary washing on the washed product, carrying out acid dissolving on hydrofluoric acid and hydrochloric acid for short time under the lower temperature to obtain the high-activity double-effect seed crystals with hydrolyzed seed crystal performance and calcined seed crystal performance. According to the invention, the required titanium source is from the intermediate product produced from the titanium dioxide powder, therefore the method has low cost and production stability; in seed crystals, non-rutile promoted seed crystals and rutile promoted seed crystals are appropriate in proportion and have dual effects of hydrolyzed seed crystals and calcimined seed crystals; when the method is used for titanium dioxide production, calcined seed crystals are unnecessary to be additionally produced, the working procedure of adding the calcined seed crystals in the bleaching process is reduced, the bleaching time is shortened, and the rinsing efficiency is improved at the same time. The seed crystals prepared by using the method disclosed by the invention have high activity, excellent performance and capability of meeting hydrolyzing and calcining requirements just by adding 2 % of seed crystals.

The invention discloses a bleaching compound enzyme for papermaking and a preparation method of the bleaching compound enzyme. The bleaching compound enzyme for papermaking, which has the advantages of complete enzyme system, good bleaching effect, easiness in preservation and good storage stability, is prepared by taking high temperature-resistant alkaline xylanase as main raw material, scientifically compounding a thermophilic bacillus culture, laccase and a medium thereof, dextranase, EDTA (ethylenediaminetetraacetic acid), a protecting agent, an activator, mannose, lipase, tannase, pectase, a whiteness stabilizer, a nonionic surfactant, an antioxidant and the like, completely retaining paper pulp cellulose and simultaneously dissolving out and degrading lignin to the greatest extent. The bleaching compound enzyme disclosed by the invention can significantly improve yield and quality of paper pulp against broad-leaf wood, coniferous wood and reed yellow slurry, and the whiteness is improved by 10.94%, 11.97% and 11.10% respectively; the yellow index is reduced by 39.84%, 37.31% and 24.32% respectively; the amount of conventional chemical products can be saved by 50-60%; and the purposes of reducing cost and protecting an environment are finally achieved.

The invention discloses a method for preparing microcrystalline cellulose from Chinese herb residue, comprising the following steps: a, mixing Chinese herb residue and distilled water, slightly boiling, and centrifuging to obtain filter residue; b, alkali treatment: adding the filter residue into a sodium hydroxide solution, carrying out water-bath treatment, centrifuging, washing precipitate to neutral level, and collecting filter residue; c, acid treatment: adding distilled water to the filter residue, adjusting pH to 1-2, carrying out water-bath treatment, centrifuging to obtain filter residue, washing to neutral level, and drying; d, extraction of Chinese herb residue crude cellulose: adding the filter residue into bleaching liquid, carrying out water-bath treatment, carrying out suction filtration, washing to neutral level, and drying to constant weight to prepare the microcrystalline cellulose. The preparation method of the invention is beneficial to raise utilization rate of waste Chinese herb residue resources and provides a safe, cheap and convenient raw material resource for the production of microcrystalline cellulose.

The invention discloses a pearl bleaching technology, which comprises the following steps that: in the sufficient sunshine, pearls after being polished are put into prepared bleaching liquid and soaked at the temperature ranging from 14 to 17 DEG C for 48 to 50 hours for bleaching treatment, and then rinsed and dried; the step is repeated for at least one time; classification: unqualified pearls are screened out and the bleaching treatment for unqualified pearls continues to be repeated for at least one time. In the invention, the format of the bleaching liquid, consisting of a hydrogen peroxide bleaching agent, a composite interface agent, a composite catalyst and a methanol solvent, is adopted for bleaching at the low temperature of 14 to 17 DEG C so as to realize the good bleaching effect under low concentrations of the hydrogen peroxide bleaching agent within a short time, thus effectively reducing the damage to the skin of the pearl and improving the glossiness of the pearl. By adopting the method of the invention, the pearls bleached have better gloss, smooth surface, higher whiteness and good stability.

A fast bleaching and antichloration method with shellac is carried out by mixing shellac with soda and water, heating to 75í½95íÒC, dissolving into shellac alkaline solution with concentration<25%, filtering, keeping temperature between 75í½95íÒC, agitating for shellac alkaline solution by 50-90r / min speed, adding into chlorine-contained bleaching agent with chlorine content 15í½22wt%, agitating for 30-40mins to obtain bleaching glue, raising temperature to 85í½95íÒC, and agitating 3í½8mins by 50-90r / min speed to obtain dechloridized glue. Its advantages include long storage period, better product quality and shorter bleaching time.

The invention discloses a bleaching treatment method of wheat-straw used for weaving. The bleaching treatment method of the wheat-straw used for weaving is simple and practicable, the working efficiency can be improved by 14.6%, the cost is low, the batch treatment can be realized, the effect is lasting through three-step bleaching and the cost can be saved by 11.7%. After the wheat-straw is soaked in fermentation liquor, the produced small molecule substances are capable of decomposing darker pigments and preliminarily softening the cellulose, so that the bleaching effect can be reinforced; after the wheat-straw is ultrasonic soaked in an acidic alcoholic solution, the antibiotic, disinfectant, anti-mildew and anti-moth effects can be realized and the rapid and uniform bleaching can be realized by leaching part of pigments; after the wheat-straw is bleached by ultrasonic, the permeation can be rapid and the bleaching can be uniform from outside to inside, so that the bleaching time can be obviously shortened. The usage amount of bleaching agents is less and the bleaching treatment can be conducted after the bleaching agents are diluted by water, so that the safety and the efficiency are good, the cost is low and the effect is lasting.

The invention relates to the technical field of straw plaiting processing and treatment, in particular to a method for blanching straw plaited articles. The method comprises the following steps: inoculating lactobacillus acidophilus to activating liquid, performing activating cultivation to obtain activated liquid, soaking the straw plaiting material into the activated liquid to perform treatment,adding 3 to 3.8 percent by weight of hydrogen peroxide into the treatment liquid, mixing uniformly, performing treatment again, completely washing the straw plaiting material after treatment, and drying. According to the method, the use amount of the hydrogen peroxide is reduced, the effect of protecting the straw plaiting raw material is achieved, the breaking strength of the blanched raw material is enhanced, the blanching effect is good, the blanching time is obviously shortened, and drying is conducted after blanching.

The invention provides a device and a method for bleaching waste textiles with gas phase chlorine dioxide. The device for bleaching waste textiles with gas phase chlorine dioxide comprises a chlorine dioxide generating system and a gas phase bleaching system. The method for bleaching waste textiles with gas phase chlorine dioxide comprises a chlorine dioxide generating step and a gas phase bleaching step. Hydroxyl radical active oxygen with strong oxidizing property is used for preparing chlorine dioxide, and the reaction condition is moderate, the energy consumption is low and the prepared chlorine dioxide is high in purity; when waste textiles are bleached by using gas phase chlorine dioxide, the high purity chlorine dioxide can reduce bleaching time, increase the whiteness of bleaching, prevent yellowing of products, and guarantee high whiteness stability and low degree of damage to textiles; the device and the method can bring favorable environmental and economical benefits.

An apparatus and method for bleaching floccules by using gaseous chlorine dioxide is provided; the apparatus comprises a chlorine dioxide generating system and a gas bleaching system; the method comprises chlorine dioxide generation and gas bleaching steps. The apparatus and method use the hydroxyl radical active oxygen of high oxidability to prepare gaseous chlorine dioxide, reaction conditions are mild, energy consumption is low, the prepared chlorine dioxide is high in purity; the gaseous chlorine dioxide is used in bleaching, and the high-purity chlorine dioxide can shorten the bleaching time and improve bleaching whiteness, so that a product is yellowing resistant, high in whiteness stability and low in fiber damage degree, meets the requirements of national policies and has good environmental and economic benefits.

The invention discloses a hydrogen peroxide bleaching catalyst. The hydrogen peroxide bleaching catalyst is formed by mixing a glutin solution and a copper sulfate solution, and the mass ratio of a glutin solute to a copper sulfate solute in a mixed liquid is (15-70):1. The invention further discloses a preparation method of the catalyst. The hydrogen peroxide bleaching catalyst is an aid formed by complexing of glutin and bivalent copper ions, when the catalyst is applied to a hydrogen peroxide bleaching process for fabrics such as cotton and the like, hydrogen peroxide can be effective catalyzed for bleaching, damage to the fabrics can be reduced, the bleaching temperature can be decreased, the bleaching time can be shortened, the consumption of an alkali in bleaching can be reduced, and low-temperature low-alkali hydrogen peroxide bleaching of the fabrics can be realized, so that problems of energy consumption, fiber damage and pollution caused by traditional high-temperature high-alkali hydrogen peroxide bleaching are solved. Besides, raw materials of the aid come from waste protein, waste resources are effectively utilized, environment-friendly and clean production is realized, and the concept of establishing the resource-saving and environment-friendly society is conformed.

The invention discloses a method for bleaching a cotton fabric by chlorine dioxide. The method comprises the following operating steps: 1, mixing a chlorine dioxide solution with a sulfamic acid solution according to a volume ratio of 50:1, and uniformly stirring; 2, adding cotton cloth strips to a mixed solution obtained in step 1 for fully immersing the cotton cloth strips, adding fatty alcohol polyoxyethylene ether sodium sulfate, and bleaching at 35-45DEG C through stirring for 2min by a stirrer each 30min when the pH value of the bleaching system is 3-4; 3, adding a 2mol / L activator to a solution obtained 120-150min after the bleaching treatment, and uniformly stirring; and 4, allowing a solution obtained in step 3 to stand for 30min, taking out cloth samples, washing with water, and drying in an oven at 120DEG C for 3-4h. The method has the advantages of bleaching efficiency and technological controllability increase, bleaching time shortening, wastewater treatment cost saving, environmental pollution reduction, and obvious economic and social benefits.

The invention discloses a bleaching process for refined cotton. The bleaching process includes the steps of a, pre-bleaching, to be more specific, discharging 25-30t of black slurry formed after cooking into a bleaching tank, injecting 20-25t of wastewater after bleaching into the bleaching tank, adding a hydrochloric acid solution, regulating pH to 4-6, injecting 5-10t of activating agent sodium hypochlorite solution into the bleaching tank, controlling effective chlorine to be at 0.5-1.0g / L, starting a stirrer for stirring for 20-30 minutes, and discharging 25-35t of water to the a sewage tank;; b, pre-washing; c, bleaching, d, washing after the bleaching; e, performing alkaline treatment; f, removing the chlorine; g, performing final washing. The bleaching process has the advantages that the activating agent is used in the pre-bleaching to reutilize the bleached wastewater, a bleaching effect is brought into play again, the discharge of bleaching wastewater is reduced, sewage treatment cost is lowered, and energy conservation and environment protection are achieved.

The invention discloses a bagasse pulp bleaching method, including the steps: preprocessing unbleached pulp by H2SO4 to reduce the content of transition metal ions; adding in a proper amount of H2O2, Mg2+ and DTPA; adding in NaOH and Na2SiO3; adding in O2 for bleaching. The invention can make the Soda-AQ processed bagasse pulp reach 79.26% ISO whiteness by single-stage bleaching, the experiment verifies that the whiteness reaches 79.92% ISO whiteness, reaching the level of C-E-H tri-stage bleaching.

The invention discloses a pulp bleaching device for packaging paper. The device comprises a reaction kettle and a reaction tank. The reaction kettle is installed in the reaction tank; the reaction tank is installed on a base; the reaction kettle is a cylindrical structure, and the outer side of the reaction kettle is surrounded by a heating pipe; a mounting ring plate and a mounting strip plate are arranged in the reaction kettle; the mounting ring plate is provided with a high-pressure nozzle hole; a pushing device is arranged in the reaction tank; and the upper inner side wall of the reaction tank is provided with an air inlet hole, which is communicated with a steam generator through an intake pipe. The device has a high-efficiency bleaching effect. By the device, paper pulp can be fully contacted with a bleaching agent; the bleaching time can be saved and the bleaching process can be simplified; the damage to the fiber structure of paper pulp by multiple operation steps is reduced,and the original quality of paper pulp can be guaranteed; the bleaching efficiency can be improved; equipment investment and floor space are reduced; and the production cost is reduced.

The invention discloses an electrochemical bleaching and setting process for ultrasonic-plasma pretreatment of black horsetail hair. The process includes washing the black horsetail hair with a detergent, adding medium water, and preforming ultrasonic treatment; then adopting a plasma technology to preform pretreatment; dissolving penetrants of fatty alcohol polyoxyethylene ether and sodium silicate in water, adjusting the pH value, adding hydrogen peroxide, heating the solution, fixing the obtained pretreated black horsetail hair on an anode of a graphite electrode, setting electric field power, preforming electrochemical bleaching treatment, washing with water, and drying; soaking the bleached and decolorized horsetail hair in distilled water, controlling the water content, setting the setting temperature, and setting in wet heat; and stretching and thinning the wet heat-set horsetail hair, pre-steaming and then stretching, steaming, washing with water, treating the hair with a setting agent, steaming and setting, washing with water, treating with boiling water, and air drying.