Method for producing 2,4-dichlorphenoxyacetic acid

A technology of dichlorophenoxyacetic acid and phenoxyacetic acid, applied in chemical instruments and methods, preparation of carboxylate salts, preparation of organic compounds, etc., can solve problems such as post-processing difficulties, environmental pollution, and small amount of waste disposal, and achieve Small amount of waste treatment, reduced production cost, and good product quality

Active Publication Date: 2011-09-14
SHANDONG WEIFANG RAINBOW CHEM
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] Aiming at the problems of serious environmental pollution and difficult post-processing in the existing 2,4-dichlorophenoxyacetic acid production process, the present invention provides a method for producing 2,4-dichlorophenoxyacetic acid, which is simple to operate and easy to produce To avoid the generation of highly toxic substances dioxins and unpleasant substances chlorophenols, good environmental protection, less waste water generation, small amount of three wastes treatment, high yield and high product quality

Method used

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  • Method for producing 2,4-dichlorphenoxyacetic acid

Examples

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Embodiment 1

[0026] Preparation of CuO / ZrO 2 Oxidation catalyst: with Na 2 CO 3 solution (5mol / L) to precipitate ZrOCl 2 ·8H 2 O(2.5mol / L) and Cu(NO 3 ) 2 ·3H 2 A mixed solution of O (2.5mol / L) (the molar ratio of zirconium ions and copper ions in the mixed solution is 1:1.5), the precipitation temperature is 65°C, and the final pH is 7.9. After the obtained hydrogel was stirred for 35 minutes, it was washed with deionized water to remove chloride ions and sodium ions, dried at 108°C, and calcined at 350°C to obtain CuO / ZrO 2 catalyst.

Embodiment 2

[0028] Preparation of CuO / ZrO 2 Oxidation catalyst: with Na 2 CO 3 solution (3mol / L) to precipitate ZrOCl 2 ·8H 2 O and Cu(NO 3 ) 2 ·3H 2 A mixed solution of O (the molar ratio of zirconium ions and copper ions in the mixed solution is 1:1.0), the precipitation temperature is 60° C., and the final pH is 8.2. After the obtained hydrogel was stirred for 45 minutes, it was washed with deionized water to remove chloride ions and sodium ions, etc., dried at 105°C, and calcined at 300°C to obtain CuO / ZrO 2 catalyst.

Embodiment 3

[0030] Preparation of CuO / ZrO 2 Oxidation catalyst: with Na 2 CO 3 solution (6mol / L) to precipitate ZrOCl 2 ·8H 2 O and Cu(NO 3 ) 2 ·3H 2The mixed solution of O (the molar ratio of zirconium ions and copper ions in the mixed solution is 1:1.9), the precipitation temperature is 70°C, and the final pH is 7.5. After the obtained hydrogel was stirred for 30 minutes, it was washed with deionized water to remove chloride ions and sodium ions, dried at 115°C, and calcined at 450°C to obtain CuO / ZrO 2 catalyst.

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Abstract

The invention discloses a method for producing 2,4-dichlorphenoxyacetic acid. The method comprises the following steps of: etherifying, dehydrogenating and oxidizing phenol and epoxy ethane in the presence of an oxidation catalyst to generate phenoxy acetic acid; dissolving the phenoxy acetic acid in a mixed solvent; making the solution react with chlorine in the presence of a chlorination catalyst; and cooling, crystallizing, filtering and drying to obtain the 2,4-dichlorphenoxyacetic acid. The method has the advantages of easiness for operation, avoidance of dioxin which is an extremely toxic substance and chlorinated phenol which is a smelly substance during production, high environmental friendliness, small amount of waste water and small treating amount of three wastes; the product has high yield and good quality; and the content of active ingredients is over 98.6 percent.

Description

technical field [0001] The invention relates to a method for producing pesticides, in particular to a method for producing pesticides 2,4-dichlorophenoxyacetic acid used as high-efficiency herbicides and plant growth regulators. Background technique [0002] 2,4-Dichlorophenoxyacetic acid, referred to as 2,4-D (2,4-D), its English name is (2,4-Dichlorophenoxy) acetic acid. Molecular formula: C 8 h 6 Cl 2 o 3 . 2,4-D is the world's first industrialized selective and high-efficiency organic herbicide. It has an important influence in the history of pesticide development. It was first produced in the United States in the 1940s, and China began to produce it in the late 1950s. So far, phenoxycarboxylic acid herbicides are still important herbicide varieties due to their low toxicity, high activity and low price, and are also one of the largest sales varieties and one of the most widely used herbicides. [0003] The production methods currently used are: 1. Chlorination of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/70C07C51/363
Inventor 孙国庆陈琦侯永生李志清
Owner SHANDONG WEIFANG RAINBOW CHEM
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