352 results about "Bromate" patented technology

The invention relates to a catalytic ozonation method for removing the organic pollutant, which solves the problems that in the prior art both the residual hydrogen peroxide from the homogeneous catalysis ozonation using hydrogen peroxide as catalyst and the byproduct bromate produced by the heterocatalysis ozonation using metal oxide as catalyst play a bad impact on human health and cause secondary pollution of water. The method of the invention comprises the following steps: a. laying the catalyst in a reactor; b. adding ozone and hydrogen peroxide; c. controlling the contacting time of the ozone and the hydrogen peroxide, that is, finishing the removal of the organic pollutant in water. The method of the invention dissolves the problem of residual hydrogen peroxide, reduces the formation of the bromate without causing the secondary pollution of water and affecting human health, which is suitable to apply in the real water treatment process as a drinking water advanced treatment technology.

The invention relates to a method for degrading organic pollutants in water by gradient ozone catalytic oxidation, and relates to a gradient ozone catalytic oxidation combination method for degrading organic pollutants in water. By the method, the problem that the conventional advanced oxidation technology has defects during individual use, the problem that the organic pollutants in the water cannot be removed efficiently, the problem that the influence of the pH value and temperature of the water on the method is large, and the problem that high-toxicity byproducts are formed are solved. In the method, water treatment is realized by combining two or three of a process for treating O3 individually, an enhanced catalytic oxidation process for O3 and an O3/ultraviolet (UV) process sequentially. By the reasonable optimizing and gradient combination of the three treatment modes, the method is suitable for wide pH values and a wide temperature range, the pollutants with intermediate toxicity are controlled to be formed, the toxicity of the pollutants is reduced, the pollutants in the water is degraded efficiently and completely, and the content of oxidative species in effluent is controlled. An efficient oxidation treatment effect is kept at low temperature, and the generation of bromate, nitroso dimethylamine, chlorate, perchlorate, iodate and periodate can be controlled greatly.

A process for preparing a pyridone derivative (4), which comprises reacting the compound (1) with a hypochlorite or a hypobromite or with lead tetraacetate to give the compound (2), and reacting the compound (2) with the compound (3). Said process is preferably especially from the standpoint of safety. wherein R1 is hydrogen, alkyl, substituted alkyl, etc.; Y1 is hydrogen, alky, substituted alky, etc.; Y2 and Y3 are indenpently hydrogen, halogen, etc.; and L is alkyl, substituted alkyl, etc.

The invention provides a method for preparing canthaxanthin. The method comprises that: in water and organic solvent immiscible with the water, under the action of hydrogen peroxide catalyst, alkali metal chlorate or bromate and beta-carotene are subjected to oxidation reaction, wherein the oxidation reaction is carried out by adding hydrogen peroxide into a mixture containing the beta-carotene, the water, metal iodide, the organic solvent immiscible with the water and the alkali metal chlorate or the alkali metal bromate to obtain reaction mixed solution. The method can efficiently produce the canthaxanthin in an industrialized mode in short time.

Disclosed are methods and compositions for altering the color of hair, comprising treating the hair with a pre-alkalizing composition and then treating the hair with a color-altering composition comprising at least one first oxidizing agent chosen from peroxides, persulfates, perborates, percarbonates, peracids, bromates, their salts and mixtures thereof, and further optionally comprising at least one fatty substance and/or thickening agent, and/or at least one second oxidizing agent. The methods may further optionally comprise applying onto the hair a coloring composition comprising, in a cosmetically acceptable carrier, at least one dye compound chosen from oxidative dye precursors, and direct dye compounds.

The present invention relates to a class of chemically named long chain alkyl berberine salt derivatives (hydrochloride or Bromate or iodate or hydrofluoric acid salt), and the molecular structural formula is stated above, wherein, X is equal to F-, Cl-, Br-, I-, SO42-, NO3-, PO43-, citric acid radical, acetic acid radical or lactic acid radical. R1, R2, R3, R4, R5 see table above. The class of the substances is provided with obvious hypoglycemic and hypolipidemic activities which are significantly higher than that of berberine salt, so that the invention is a very promising new compound with hypoglycemic and hypolipidemic medicinal values.

The present invention discloses a nitrogen ligand chelate resin nanoscale zero-valent iron-loaded composite material and application thereof for reduction of bromate in water, and belongs to the field of drinking water advanced treatment. The structure of the composite material is that: (1) the carrier of the composite material is the chelate resin having a pyridyl group, and (2) inner and outer surfaces of the carrier loads nanoscale zero-valent iron, wherein the preparation of the zero-valent iron includes guiding Fe3+ or Fe2+ by chelation into the inner and outer surfaces of the resin, reducing to zero-valent iron by using sodium borohydride, and vacuum drying to obtain the zero-valent iron composite material. The step of bromate reduction in water includes: passing a bromated-containing solution through a fixed bed adsorption column loaded with the nitrogen ligand chelate resin nanoscale zero-valent iron-loaded composite material. Treated by the present invention, the BrO3- concentration at the adsorption column outlet can be reduced to below 10 [mu]g/L. The composite material overcomes the problem that the reduction efficiency of ordinary iron element is low, and the release of iron ions is excessive during the reduction of pollutants, realizes the reduction of bromate well, and is a highly efficient and rapid material for pollutant degradation.

The invention discloses a device and a method with ultrasonic ozone and ultraviolet synergized for water treatment. The device comprises an outer cylinder and an inner cylinder positioned inside the outer cylinder, an ultraviolet treatment area is formed between the outer cylinder and the inner cylinder, and a water outlet is arranged on the upper portion of the wall of the outer cylinder. An ultraviolet lamp is arranged on the outer wall of the inner cylinder, an air inlet pipe and an air escape valve are arranged at the top of the inner cylinder, and an ozone inlet pipe is arranged at the bottom of the inner cylinder and connected with an ozone aerator. A padding layer is arranged on the inner upper of the inner cylinder, an ultrasonic reaction area is arranged below the padding layer, and a water outlet valve and an ultrasonic transducer are disposed on the inner wall of the ultrasonic reaction area. Using the device to treat slightly-polluted waste water enables quality of discharged water to reach the primary standard of national emission standards, and the problem of bromate during ozonization of brominated waste water can be solved. In addition, the device and the method have the advantages of simple flow, no pollution and low cost.