32 results about "2,4-Dichlorophenol" patented technology

A method for synthesis of nanocomposites using polymerized carbon nanotubes and phenolic compounds, such as 2,4-dichlorophenol, 4-nitrophenol, 2-nitrophenol, 4-chlorophenol, 2,4,6-trinitrophenol and phenol, in aqueous media, as well as the application of one of such nanocomposites, namely MWCNT-g-PCA-Phenol, as a DNA extraction agent. The aforementioned nanocomposites enable the isolation of genomic DNA of plant samples. Pursuant to the present invention, the toxicity of free phenols used in DNA extraction is decreased since very low concentrations of phenol are required in the method, as compared to conventional techniques which employ saturated phenol solutions. This remarkable advantage is due to the encapsulation of the phenol nanoparticles into the polymerized carbon nanotubes.

The invention discloses a method for treating 2,4-dichlorophenol wastewater by ozone oxidation in an organic solvent, and belongs to the field of organic wastewater treatment. Active carbon is used as an adsorbent in an adsorption column; extraction and enrichment are performed on the 2,4-dichlorophenol wastewater with concentration of less than 500mg / L; after the active carbon is adsorbed and saturated, natural gravity drainage is performed; and outer circulation desorption-ozone oxidation treatment is performed by adopting aqueous solution of acetone. The residual zone containing tail gas enters the active carbon column in adsorption treatment and is subjected to adsorption-decomposition treatment and then emitted to the atmosphere. The aqueous solution of the acetone and the active carbon can be recycled; and under the same conditions, compared with a traditional reaction system, the adding amount of ozone is reduced by over 1 / 2, the reaction time is shortened by over 2 / 3, the total removal rate of the 2,4-dichlorophenol reaches over 90 percent, and the quality of the discharged water is stable. The method has the advantage of efficient low-consumption treatment, and is convenient for operation in actual projects, easy to control and easy to realize industrialized production.

The invention discloses a method for separating 2,4-Dichlorophenol and 2,6-Dichlorophenol, comprising the following steps: dissolving the mixture of the 2,4-Dichlorophenol and the 2,6-Dichlorophenol in an organic solvent, adding alkalic organism, stirring and reacting at the temperature of 40-80 DEG C until the reaction liquid is clear, cooling the reaction liquid after the reaction is finished, standing and precipitating crystals, filtering to obtain a filter cake A and a filtrate A, and retaining the 2,4-Dichlorophenol in the filtrate A, wherein the filter cake A is a crude product of the 2,6-Dichlorophenol; the alkalic organism is triethylene diamine, morpholine, piperazidine, ethylpiperazine or methyl piperazine; and the organic solvent is ethanol, methanol, acetone or ethyl acetate. The invention has higher separation efficiency and only need crystallization for one time; the total yield of the 2,4-Dichlorophenol is 90-95%, and the purity thereof is 96-99%; the total yield of the 2,6-Dichlorophenol is 77-89%, and the purity thereof is 90-99%; and the invention has the advantages of simple operation, good repeatability and low implementation cost, and is favor of industrialized scale-up.

The invention relates to a novel method for synthesizing fenoxanil serving as a systemic fungicide. The novel method for synthesizing fenoxanil serving as the systemic fungicide comprises the following steps: adding 2,4-dichlorophenol, sodium hydroxide and 2-methyl chloropropionate into a methyl benzene solvent, controlling reaction temperature at 30-70 DEG C, washing methyl benzene phase by using water after the reaction is ended, and carrying out reduced pressure distillation on a solvent of the washed methyl benzene phase to obtain dichlorprop methyl ester; and adding the obtained dichlorprop methyl ester into a methyl benzene solution with dissolved 2-amino-2,3-dimethyl butyronitrile and sodium bicarbonate, reacting by controlling the reaction temperature at 0-30 DEG C, washing the methyl benzene phase by using water after the reaction is ended, carrying out reduced pressure distillation on a solvent of the washed methyl benzene phase, recrystallizing by using a mixed solvent of water and ethyl alcohol, reducing the temperature to the room temperature, and filtering to obtain the fenoxanil. According to the synthesis method, 2-chloropropionic acid is replaced by 2-methyl chloropropionate; dipropionyl chloride is replaced by the generated dichlorprop methyl ester; one-step acylation reaction is eliminated; the process route is simplified; the reaction period is shortened; the method has great development in the industrial production.

The invention provides a method for separating a mixture of 2, 4-dichlorophenol and 2, 5-dichlorophenol. Based on the fundamental principle of supramolecular assembly, the method uses topology match between subjective molecules and objective molecules, and separates 2, 4 / 2, 5-mixed dichlorophenol by identifying molecules. Because of different molecular spatial structures of the 2, 4-dichlorophenol and the 2, 5-dichlorophenol and certain difference on polarities, specific different identifying capability among the subjective molecules exists, while difficulty or ease of intermolecular actions among the subjective molecules and other heterocyclic compound is different, therefore, the aim of separation can be achieved through identifying the molecules. The product obtained from the 2, 4 / 2, 5-mixed dichlorophenol by the method has high purity, and can be directly used after being separated, but does not need to be recrystallized to improve purity; and the method has high yield, is simple and practical, and is easy to industrialize.

Various processes for the separation of a mixture containing dichlorophenols are described. In various aspects, the present invention relates to separation processes that produce an extract enriched in 2,4-dichlorophenol content and an extract enriched in 2,5-dichlorophenol content. The present invention further relates to various processes that integrate with these separation processes, such as a process for producing 3,6-dichloro-2-methoxybenzoic acid (dicamba) or salt or ester thereof or a process for producing 2,4-dichlorophenoxyacetic acid (2,4-D) or salt or ester thereof.

The invention relates to a method for quantitatively detecting 2, 4-dichlorophenol in water, belonging to the field of analysis and detection of a compound. The invention provides a method for detecting 2, 4-dichlorophen in water through a head space solid phase microextraction-gas chromatography. The extracting head of the solid phase microextraction has the effect of gathering volatilizing components and can detect trace 2, 4-dichlorophen in water. The method can be used as a standard method for detecting the concentration of 2, 4-dichlorophen in water, the pretreatment is simple and rapid, and only needs heating and extracting for 30 minutes, no solvent is needed, the method is safe and environment-friendly, the dosage of the sample is less, the method has good linear adding standard recovery, and the detection sensitivity can reach 6.54mu g / L.