33results about How to "Inhibit excessive oxidation" patented technology

The invention discloses a preparation method of perfluoro-2-methyl-3-pentanone. According to the method, perfluoro-2-methyl-2-amylene is used as a raw material to be subjected to gas-phase reaction with a certain amount of oxidative gas such as oxygen or air in a fixed bed reactor under the catalyst existence condition; the perfluoro-2-methyl-3-pentanone is directly prepared through one-step or two-step gas-phase reaction, wherein the two-step gas-phase reaction mainly includes perfluoro-2-methyl-2-amylene epoxidation reaction and epoxidation compound gas-phase isomerization reaction. By using the technology, the fixed bed reactor process is used for continuously performing the gas-phase reaction; solvents are not needed in the production process; the cost is greatly reduced; the environment pollution problem is solved; the process safety is improved; meanwhile, the problems of separation of solvents from products, recovery treatment of solvents and catalysts and the like are also avoided. Therefore the preparation method has the characteristics that the cost is low, the preparation is convenient, technical parameters of the catalyst reaction process can be easily controlled, the product separation and purification are simple, the preparation method is very suitable for industrial production and the like.

The invention provides a zinc-magnesium based brazing alloy with low working temperature and good welding performance and a preparation method thereof. The alloy comprises the following components in percentage by weight: 1.2-1.9 Al, 33-37 Mg, 3.1-6 Sn, 0.0031-0.006 Be, 0.025-0.095 Pr, 0.5-2.5 Bi and the balance of Zn. The preparation method comprises the following steps: heating and melting matched material in a N2 mixing protective atmosphere; firstly, putting Al ingots and Sn strips at the bottom of a crucible; then adding pure Be blocks, Mg-Pr intermediate alloy and pure Bi powder; subsequently adding Mg ingots; and finally adding Zn ingots; keeping the temperature for 4-8 minutes when reaching to 700-725 DEG C, and then casting into a steel ingot mold preheated to 200 DEG C, thereby obtaining the zinc-magnesium based brazing alloy, wherein the weight percent of Pr in the Mg-Pr intermediate alloy is 8 percent.

The invention discloses a method for regulating and controlling oxidized animal fats. The pork is cut into strips, smeared evenly with 4-7% salt and 1-3% white sugar, marinated at 1-10°C for 48-72 hours, and then soaked in 15-25 hours. Air-dry at ℃ for 6-9 days, take subcutaneous fat as raw material, and oxidize while stirring. After reacting for 1-4 hours, add 0.05-0.3% antioxidant, mix evenly, stop the reaction, and cool to obtain oxidized animal fat. The method has the advantages of mild oxidation conditions, easy oxidation regulation and convenient operation, and is suitable for industrial production. The oxidized animal fat obtained in the invention has the characteristics of natural and elegant color, outstanding characteristic aroma and full mouthfeel, and can be used as a precursor to directly participate in the preparation of heat-reactive pork essence, and has great application value and market prospect.

The invention discloses a compound antioxidant and a pickling processing method for inhibiting excessive oxidation of fatty fish lipids, which consist of the following components: the concentration of Lactobacillus plantarum is 10 8 -10 10 cfu / mL dosage: 2.0‑3.5% v / w; rosmarinic acid dosage: 0.03‑0.05% w / w; bamboo leaf flavonoid dosage: 0.03‑0.05% w / w; vitamin C dosage: 0.01‑0.02% w / w; the amount of the above-mentioned components is the percentage of the mass of the treated fish. The invention is beneficial to promote the moderate fat oxidation of fatty fish during salting and low-temperature drying, and produce the unique flavor of salted and dried fish. After drying, the oxidation process is also in a stagnant state, thereby effectively inhibiting fatty fish from being marinated. Further lipid hyperoxidation of the dry product prolongs the shelf life of the product.

The invention discloses a method for preparing oxidized egg oil. The method comprises the following specific steps: (1) extracting egg oil; (2) performing oxidation regulation and control on the egg oil; and (3) applying the oxidized egg oil. The method has the advantages of being gentle in extraction condition, easy in oxidation and regulation and control and convenient to operate, and is applicable to industrial production. The oxidized egg oil prepared by using the method is clear and bright in color, outstanding in characteristic fragrance and full in taste, can be used as a food additive for preparing essence or seasonings, and has great application values and market prospects.

The invention provides a selenium-doped lithium-rich manganese-based positive electrode material and its preparation method and application. In the structure of the selenium-doped lithium-rich manganese-based material, selenium is distributed in the lithium-rich manganese-based positive electrode material in the form of anions. The general chemical formula of the cathode material is mLi 2 MnO 3‑δ Se 2δ / 3 •(1‑m)LiTMO 2‑δ Se 2δ / 3 , wherein, TM is at least one of Ni, Co and Mn, 0.2≤m≤0.8, 0<δ<2; in terms of mass percentage, the selenium content in the positive electrode material is 0~5%. The cathode material has good lattice stability and electrode / electrolyte interface stability, which can not only inhibit the loss of lattice oxygen during the cycle, but also inhibit the decomposition of the electrolyte, and alleviate the degradation of the lithium-rich manganese-based cathode material during the cycle. Capacity fading and voltage drop effectively overcome the problems of poor rate performance in existing cathode materials. The preparation method of the invention is simple and easy to popularize.

The invention belongs to the environmental protection industry and the field of three-waste environmental protection purification, and relates to a method for closed-circuit microorganism desulfurization and elemental sulfur recovery, particularly to a process for biological desulfurization treatment of sulfur-containing industrial gases (such as biogas, natural gas, coal chemical industry processgas, refinery gas, sulfur-containing industrial waste gas, and the like, wherein the purposes of closed-circuit biological desulfurization, maximized recovery of elemental sulfur, standard emission of waste gas and near-zero emission of waste liquids can be achieved through chemical absorption, biological oxidation, elemental sulfur recovery, membrane separation, anaerobic reduction and other processes. According to the present invention, the treatment method can meet the biological desulfurization requirements, can solve the difficult problem of elemental sulfur production through sulfide oxidation and enhanced separation, and can be used for biogas, natural gas, coal-to-gas, refinery gas, sulfur-containing industrial waste gas and other industrial large-scale engineering.

The invention relates to a cement kiln device and a synergistic method for SNCR denitrification. By using a synergist loaded with at least one of Fe, Ni, and W on the surface of the carrier, it is possible to set the injecting position of the reducing agent at the fifth Between the first-stage cyclone separator and the fourth-stage cyclone separator, so as to avoid the high concentration of dust in the decomposition furnace and the fifth-stage cyclone separator, especially a large number of decomposed oxides, such as highly active oxides such as CaO Adverse effects on SNCR denitrification process.