784 results about "Oxidative degradation" patented technology

The invention discloses a method for producing humic acid and salt thereof through the oxidative degradation of young lignite. The method comprises the following steps: carrying out the oxidation reaction of the lignite containing the humic acid and aqueous hydrogen peroxide solution; after the reaction, obtaining water soluble fulvic acid through centrifugal separation, supernatant filtration, concentration and drying; adding alkali into the fulvic acid to prepare a fulvic acid salt product; carrying out the alkaline extraction and centrifugal separation of the residue deposit of the production of the fulvic acid, adding acid into the supernatant till the pH value is 1 to 2, carrying out a reaction at an increased temperature or room temperature, carrying out centrifugal separation after the reaction is finished, and obtaining purified ulmic acid after precipitation and drying; and directly concentrating and drying the supernatant in the previous step to obtain the humate. The method can improve the yield of the fulvic acid and total humic acid in the young lignite, and simultaneously increase the active group in the humic acid. The method can be used for producing fulvic acid, fulvic acid salt, ulmic acid and ulmic acid salt products. In particular, the method puts an end to the environmental pollution caused by the nitric acid which is taken as an oxidation degradation agent. In addition, the method has a short technological line, low cost, simple requirements on equipment, and moderate conditions. The method which can be applied to the industrialized production has good application prospect.

Analyte sensors having antioxidant protection are disclosed. By combining antioxidant and/or scavenger agents into polymer matrices that contain sensor moieties, the sensor moieties are protected from reactive oxygen species. Also disclosed are methods of making analyte sensors and methods of inhibiting oxidative degradation of sensing components in hydrated, polymerized analyte sensor systems.

The invention provides a preparation method of an attapulgite-loaded nanometre iron material. Acidized and modified attapulgite is taken as a load material, and KBH4, NaBH4, N2H4 and the like are taken as reducing agent under the protection of inert gases, so that ferric salt or ferrite can be reduced to be zero-valent iron; and the multi-duct characteristic of the attapulgite is utilized, so that nanometre iron particles are sufficiently dispersed and fixedly loaded on the attapulgite material. Compared with un-loaded nanometre iron, the attapulgite-loaded nanometre iron material prepared by the preparation method has better dispersibility and stability, is more uniform in particle size distribution, not easy to cause particle agglomeration and self-oxidization; and moreover, the attapulgite-loaded nanometre iron material has better suspension property and stability in aqueous solution, a stronger oxidative degradation ability to environmental pollutants, longer effective reaction time, and a better adsorption capacity. The material is expected to be extensively applied to environment pollution abatement and repair engineering, and fills a blank in the filed at home and abroad.

An encapsulated material containing an oxidation-sensitive core is covered by at least a dried phospholipid layer, and contains at least one phytosterol in the core, the phospholipid layer or in a further layer or layers. By using microencapsulation, oxidatively unstable materials may be provided with a synthetic protective barrier and rendered less susceptible to oxidative degradation.

Methods and compositions for preventing oxidative damage to proteins, particularly antibodies, are provided. The compositions include a combination of metal chelators, such as DTPA, EGTA, and/or DEF, and can further include one or more free radical scavengers, particularly scavengers of oxygen radicals. Methods for enhancing protein stability using the compositions of the invention are also disclosed.

The invention relates to a controllable oxidative-biological degradation plastic master batch, comprising an inorganic filling material, a carrier, an oxidative degradation promoter, a biodegradation promoter and a degradation control agent, wherein the degradation control agent is an anti-oxidant. According to the plastic master batch provided by the invention, a bivariate control system of oxidative degradation and biodegradation can be optimized and linked according to an actual environment so as to allow the plastic master batch to have environment targeting performance and degradation controllability. A preparation method for the plastic master batch is simple, is easy and convenient to operate, improves mixing and dispersing capability of the plastic master batch and provides an effective solution to overcome the problems of organic-inorganic interfacial compatibility and uniform dispersibility.

The invention relates to a single- or multilayer, biaxially oriented film based on a crystallizable polyester and comprising at least one primary stabilizer for inhibiting oxidative degradation. The crystallizable polyester comprises from 100 to 10 000 ppm of primary stabilizer in covalently bonded form. The invention further relates to a process for producing the film.

Embodiments of the invention provide analyte sensors having elements designed to modulate their chemical reactions as well as methods for making and using such sensors. In certain embodiments of the invention, the sensor includes an analyte modulating membrane that comprises a linear polyurethane/polyurea polymer comprising one or more agents selected for their ability to stabilize the polymers against thermal and/or oxidative degradation.

The invention relates to an efficient waste heat using organic contaminated soil displacement thermal desorption repairing system and method. A burner is communicated with a high temperature oxidizingchamber, a high temperature smoke pipe of the high temperature oxidizing chamber is communicated with a rotary kiln heating processing system and an air heat exchanger, a high temperature air outletof the air heat exchanger is communicated with the burner, a smoke pipe of the air preheater is communicated with an inlet of a quench tower, an outlet of the quench tower is communicated with an inlet of a bag-type dust collector, an outlet of the bag-type dust collector is communicated with an inlet of a deacidification tower, an outlet of the deacidification tower is communicated with an air inlet of a second induced draft fan, and an outlet of the second induced draft fan is communicated with a chimney. A part of high temperature flue gas generated by the burner enters a rotary kiln thermal desorption reactor to achieve desorption of organic pollutant and soil drying pretreatment, organic matter enters the high temperature oxidizing chamber through a backflow pipe for burning treatment, and thorough oxidative degradation removal is achieved; and the other part of high temperature flue gas is used for increasing the temperature of combustion air through the air heat exchanger.

The invention relates to a super hydrophobic silicon-fluorine polymer/nanometer silica hybridization nanometer material and a preparation method thereof, relating to a super hydrophobic nanometer material and a preparation method thereof. The invention provides the super hydrophobic silicon-fluorine polymer/nanometer silica hybridization nanometer material with mild reaction condition, definite reaction product structure as well as simple and convenient operation and the preparation method thereof. The preparation method comprises the following steps of: firstly, preparing nanometer silica modified by a silane coupling agent; secondly, preparing a nanometer silica atom transfer radical surface initiator; thirdly, preparing a SiO2-poly-Methacryloxypropyltrimethoxysilane macromolecule initiator; and finally preparing the silicon-fluorine polymer/nanometer silica hybridization nanometer material. The silicon-fluorine polymer/nanometer silica hybridization nanometer material has excellent high temperature resistance, ultraviolet resistance, infrared radiation resistance, oxidative degradation resistance, chemicals resistance and contamination resistance. Polymethyl 2-propenoic acid, 2,2,3,3,4,4,4-heptafluorobutyl ester has very low surface energy and very good hydrophobicity, wherein the surface energy can be as low as 0.5-1.5mN/m, and the hydrophobic angle can be over 150 degrees.

The invention relates to a method for treating sewage, in particular to a method for treating organic sewage by the synergy of a cavitation effect and sulfuric acid free radicals. The method comprises the following steps of: adding an oxidant and a catalyst into organic pollutant-containing sewage, and performing oxidative degradation on organic pollutants under the action of the cavitation effect. The cavitation effect is an ultrasonic or hydraulic cavitation effect, preferably the hydraulic cavitation effect; the hydraulic cavitation effect is a jet cavitation effect or an eddy cavitation effect; the jet cavitation effect is generated through a pipe of which the diameter is changed rapidly; and the eddy cavitation effect is generated through a cylinder type eddy cavitation bin. The cavitation effect is applied to the process of treating the sewage by the sulfuric acid free radicals, so that the generation efficiency of the sulfuric acid free radicals is improved, and the degradation rate of the organic pollutants in water is improved; in the method, reaction conditions are simple and mild, a high temperature and ultraviolet ray and gamma ray irradiation are not needed, and a pH value has a wide application range and does not need to be adjusted; and the reaction speed is high, and the using amount of the oxidant is reduced; and the treatment efficiency is high, and the method is suitable for treating a large amount of the sewage.

The invention discloses a method for low-temperature oxidative degradation of organic gas. The method comprises the steps that a nanotube limited-range active component catalyst is used as a catalyst, a reaction is carried out under the conditions that the temperature is 45-220 DEG C and the airspeed is 100-100000h<-1> for 0.5-1500h for a catalytic oxidation degradation reaction of organic gas, and the organic gas is oxidized into degradation reaction and water. According to the method, by means of the nanotube open-framework structure and micronanospace, the active component of the catalyst for treating organic gas is planted into the nanotube open-framework structure to prepare the nanotube limited-range active component catalyst with high activity and stability, the limited-range catalyst is used for oxidative degradation of organic gas and can rapidly oxidize the organic gas at a low temperature into carbon dioxide and water, the organic gas removal rate reaches up to 95% or more, the catalyst is high in activity and long in service life, and the problems that reaction temperature is high, catalyst activity and stability are low and the catalyst active component service life is short in the prior art are solved.

The invention provides a high-efficiency catalytic ozonation process which is particularly applicable to purification and treatment of water bodies with organic pollutants. Pretreated organic wastewater is mixed with ozone prior to entering a catalytic oxidation tower through a micronano bubble generation device, and the catalytic oxidation tower is filled with catalytic filler materials for catalyzed oxidative degradation of organics in wastewater. The catalytic filler materials in the catalytic oxidation tower are large in specific surface, ozone catalyzing capability can be enhanced by composite metals on the catalytic filler materials, and effective utilization rate of hydroxyl free radicals can be increased. Compared with traditional catalytic treatment processes and catalytic filler materials, the high-efficiency catalytic ozonation process has the advantage of high efficiency in elimination of toxic and harmful organics in the water bodies.

The invention provides a method for deeply processing waste water from paper making by oxidative degradation, flocculation precipitation and sand leaching, which is characterized by low investment, simple process, high pollutant removal rate and low operation cost. After the waste water is processed by the method, the COD is less than 70mg/L, the BOD5 is less than 20mg/L, and SS is less than 30mg/L.

Disclosed is a method for estimating, within a short time, the life of a cable insulating coating material containing an antioxidant in a suitable concentration based on the rate of decrease of the antioxidant and on the critical concentration of the antioxidant at which oxidative degradation rapidly proceeds. The method tests the coating material to examine its life, the coating material including a base polymer, and an antioxidant having a functional group suppressing an oxidative deteriorative reaction of the base polymer. The method includes performing a thermal degradation test on the coating material; determining the degradation levels and degradation rates of the coating material at two or more time points in the thermal degradation test, based on the ratio of the absorbance of the functional group of the antioxidant to the absorbance of the base polymer; and thereby evaluating the life of the coating material.

The invention provides a chemical oxidation restoration method for organic polluted soil. The chemical oxidation restoration method for the organic polluted soil comprises the step of injecting a pH regulating agent, an oxidizing agent and a catalyst in situ to oxidize organic matters in soil and specifically comprises the following steps: in a to-be-restored soil region, drilling and stirring to the to-be-restored depth by utilizing a bored pile drilling machine, pumping the pH regulating agent by virtue of a flexible pipe arranged inside a drill rod by adopting a pump while the drill rod drills into the soil, uniformly distributing a medicament into the soil under the stirring action of the drill rod, and regulating pH of the soil to be in an appropriate range; and under the condition that a drill lifting rod is used for stirring, switching to an oxidizing agent pipeline and a catalyst pipeline by utilizing a valve, and pumping the oxidizing agent and the catalyst as well as a chelating agent into the soil by virtue of a pump, so that oxidative degradation on organic pollutants in the soil is realized.

The invention discloses a preparation method of a polyinosinic acid-polycytidylic acid lyophilized powder injection. The method comprises the preparation of a polyinosinic acid-polycytidylic acid solution and a preparation of a lyophilized powder injection thereof. According to the invention, proper amounts of polyinosinic acid and polycytidylic acid are respectively dissolved by using normal saline; the mixtures are mixed and stirred, such that the polyinosinic acid-polycytidylic acid solution is prepared; a lyophilization additive is added and well mixed; and filtering, sub-packaging, and lyophilization are carried out. The prepared injection is suitable for frost preservation under a temperature below 0 DEG C. Therefore, expiration date is postponed, oxidative degradation speed is reduced, toxic and side effect are reduced, and stability is improved.

The invention provides a multistage plasma air purifier. The multistage plasma air purifier is composed of a draught fan, a shell, a filtering layer, multiple stages of medium blocking and discharging reactors and an ozone decomposing catalyst. The multiple stages of medium blocking and discharging reactors and the ozone decomposing catalyst are core parts of the multistage plasma air purifier. According to the purifying principle, after particles are removed from air containing volatile organic compounds (VOCs) through the filtering layer; the VOCs are subjected to oxidative degradation through the multiple stages of medium blocking and discharging reactors to become carbon dioxide and water; ozone and not completely-decomposed organic matter which are generated by the medium blocking and discharging reactors are decomposed by the ozone decomposing catalyst; and final indoor air quality reaches the purification requirement.