The invention discloses a preparation method of a nonhomogeneous Fenton reagent, which comprises the following steps: a. putting carrier fibers in a metal salt solution, and treating in a 40-90 DEG C water bath; b. adding alkali to regulate the pH value to an alkaline state to generate oxyhydroxide, washing and carrying out vacuum filtration; and c. putting the filtered solid in a drying oven, heating for 2-12 hours, and cooling to room temperature to obtain the nonhomogeneous Fenton reagent. The prepared Fenton reagent can be directly used in a dye solution photodegradation experiment, and successfully solves the problems of high addition amount, difficulty in recovery and separation, loss of active components and severe secondary pollution in the traditional Fenton reagent. The method is applicable to large-scale production and has wide application prospects.

Preparation method of nonhomogeneous Fenton reagent

The invention discloses a treatment method for condensed wastewater in the disperse blue 56 production process. The treatment method comprises the following steps: heating the wastewater to be 25-100 DEG C, performing heat preservation reaction for 0.5-8 ours, adjusting the wastewater to be acidic, performing acid precipitation till no precipitate is generated and filtering to obtain a filtrate I; adding a primary amino compound into the filtrate I, reacting till no gas is generated, adjusting the mixture to be alkalic, introducing ozone to oxidize for 0.5-4 hours, then adding hydrogen peroxide, performing stirring reaction for 0.2-1 hour and filtering to obtain a filtrate II; concentrating and separating the filtrate II to obtain organic salt. The treatment method for the condensed wastewater in the disperse blue 56 production process is a treatment process taking pre-treatment, acid precipitation and oxidation-concentration as a main line, specially aims at the wastewater generated in the condensation process of a disperse blue 56 production process and can decompose organic matters remaining in the wastewater and remove the COD (Chemical Oxygen Demand) and the chromaticity in the wastewater step by step in a targeted way.

Treatment method for condensed wastewater in disperse blue 56 production process

The invention relates to a treatment method of azo dye wastewater, and the treatment method particularly comprises the following steps of: simultaneously adding active carbon fibers and oxidizing agent potassium hydrogen peroxymonosulfate in proportion under the reaction condition of normal temperature and pressure, stirring and treating the azo dye wastewater, wherein the mole ratio of pollutants/potassium hydrogen peroxymonosulfate is 1/10-1/40, and the adding amount of the active carbon fibers is 0.2-1.0 g/L. The treatment method disclosed by the invention is carried out at normal temperature and pressure, is moderate in reaction condition and easy to operate and has a better treatment effect on the azo dye wastewater with various colority.

Method for treating azo dye wastewater

The present invention relates to a method for producing a hydrated hydrazine, a substituted hydrazine, or an amino compound, the method being characterized in that by hydrolyzing a ketone azine, a hydrazone or a Schiff base compound in the presence of carbon dioxide in a subcritical, supercritical or liquid state, obtained are: a ketone; and a hydrated hydrazine or substituted hydrazine, or carbazic acid or a substituted carbazic acid, or a carbonyl compound and an amino compound, or a carbamic compound or a substituted carbamic acid.

Method for cleaving azine or hydrazone bond

The invention provides a sewage decoloration method. A chemical oxidation method is adopted in the sewage decoloration method. The sewage decoloration method is characterized in that sewage which is treated with biotechnology is conveyed into a first decoloration tank through a pump, and meanwhile moderate decoloration agents A are added into the first decoloration tank. The sewage in the first decoloration tank is conveyed into a second decoloration tank through a pump, and meanwhile moderate decoloration agents B are added into the second decoloraton tank. The sewage in the second decoloration tank is conveyed into a waste water clarification tank through a pump, meanwhile, flocculants are added into the clarification tank for standing for 1-2h, and clear water is discharged, wherein the chromaticity of the clear water is smaller than 50. The decoloration agents A comprise, by weight, 30-60% of calcium hypochlorite, 30-40% of sodium hypochlorite and 0-40% of 10% hypochlorous acid solution. The moderate decoloration agents B comprise, by weight, 10-20% of acetic acid, 75-89% of 30% hydrogen peroxide solution and 1-5% of ozone. The sewage decoloration method has the advantages of being simple in technology, good in discharged water quality, low in chromaticity and the like.

Sewage decoloration method

PROBLEM TO BE SOLVED: To easily, economically and advantageously decolorize by adding hydrogen peroxide or peroxide forming hydrogen peroxide in water solution and alkali metal salt or ammonium salt of cyanic acid or dicyandiamide to a dyestuff containing water solution SOLUTION: A method of decolorizing a dyestuff containing water solution is carried out by adding hydrogen peroxide or peroxide forming hydrogen peroxide in water solution and alkali metal salt or ammonium salt of cyanic acid or dicyandiamide to the dyestuff containing water solution And hydrogen peroxide or the like, cyanates, dicyandiamide and an alkali agent used may be added to the dyestuff containing water solution as a mixed water solution in advance, and each water solution or solid may be separately added In the case this method is conducted for waste water treatment, it may be combined with a general waste water treating method, for example, a coagulation method, a microorganism treating method, an active carbon adsorption method, an ozone oxidation method or the like to perform waste water treatment

Method of decolorizing dyestuff containing water solution

PROBLEM TO BE SOLVED: To provide sodium percarbonate particles with superior storage stability and safety which is suitable for a detergent. SOLUTION: In manufacturing, a sodium percarbonate particles are coated with (A) a compound of 0.1-2.5 weight %, molecules of which contain at least one radical represented by -NH-C(=O)-NH- or -NH-C(=NH)-NH- and (B) compounds of 5-20 weight %, at least one compound selected from the group consisting of alkali metal bicarbonates, alkali metal carbonate and alkali metal sulfates.

Sodium percarbonate particles with superior stability/ safety

PROBLEM TO BE SOLVED: To develop a method for stably and efficiently removing a hydrazine component and an environment load component from an aqueous solution, which contains a hydrazine compound or the environment load component such as COD or the like in low concentration and is discharged from a hydrazine manufacturing plant, over a long period of time. SOLUTION: The aqueous solution containing the hydrazine compound generated when hydrated hydrazine is manufactured is brought into contact with oxygen-containing gas in the presence of at least one element, which is selected from iron, manganese, zinc, chromium nickel, cobalt and copper, under a condition of pH 7 or more and subsequently treated biologically. COPYRIGHT: (C)2002,JPO

Method for treating hydrazine-containing wastewater

PROBLEM TO BE SOLVED: To synthesize ketazine at a high rate of reaction in a high yield with high selectivity and to profitably obtain hydrazine by synthesizing ketazine in the presence of CO 2 when hydrazine is produced using an arsenic compd. as a catalyst. SOLUTION: When ketone is allowed to react with ammonia and H 2 O 2 in the presence of a working soln. contg. an org. arsenic compd. to synthesize ketazine and this ketazine is hydrolyzed to produce hydrazine, ketazine is synthesized in the presence of CO 2 . The amt. (mol) of this CO 2 is preferably 0.0001-10 times that of the H 2 O 2 . The org. arsenic compd. is, e.g. methylarsonic acid, ethylarsonic acid or diethylarsinic acid. The ketone is preferably acetone, methyl ethyl ketone, methyl isobutyl ketone or cyclohexanone. COPYRIGHT: (C)1997,JPO

Production of hydrazine

PROBLEM TO BE SOLVED: To develop a method for efficiently removing a hydrazine compound in an aqueous solution. SOLUTION: The aqueous solution containing the hydrazine compound is brought into contact with oxygen-containing gas in the presence of at least one element, which is selected from iron, manganese, zinc, chromium nickel, cobalt and copper, under a condition of pH 7 or more. In this case, a part or the whole of the oxygen-containing gas is circulated to remove the hydrazine compound in the aqueous solution.

Kiyoshi Yoshida

Papers

Method of decolorizing dyestuff containing water solution

Sodium percarbonate particles with superior stability/ safety

Method for treating hydrazine-containing wastewater

Production of hydrazine

Method for removing hydrazine compound