Chlorination method for phenoxyacetic acid

A technology of phenoxyacetic acid chloride and phenoxyacetic acid, applied in the direction of electrolysis process, electrolysis components, electrolysis organic production, etc., can solve the problems of poor selectivity, environmental pollution, high cost, etc., achieve reduction of preparation cost, simple method steps, and easy operation easy effect

Inactive Publication Date: 2012-01-25
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention solves the problems of high cost, low yield, poor selectivity and environmental pollution in the chlorin

Method used

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  • Chlorination method for phenoxyacetic acid
  • Chlorination method for phenoxyacetic acid
  • Chlorination method for phenoxyacetic acid

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specific Embodiment approach 1

[0009] Specific embodiment one: present embodiment provides a kind of chlorination method of phenoxyacetic acid, specifically completes according to the following steps:

[0010] 1. Preparation of phenoxyacetic acid solution: add phenoxyacetic acid to an organic solvent to form a phenoxyacetic acid solution with a mass-volume concentration of 5 to 150 g / L; 2. Electrolysis: add the phenoxyacetic acid solution prepared in step 1 to the single In the hydrochloric acid solution of the chamber electrolytic cell, obtain the phenoxyacetic acid electrolyte, then turn on the power supply, adjust the current intensity to 0.1A-0.4A, and electrolyze the chlorination at room temperature with a voltage of 1.1V-2V for 2-10 hours, and obtain the electrolytic 3. Purification: the reaction solution after step two electrolysis is processed by vacuum distillation to obtain the crude product of phenoxyacetic acid chloride, and then the crude product of phenoxyacetic acid chloride is processed by re...

specific Embodiment approach 2

[0016] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass-volume concentration of the phenoxyacetic acid solution prepared in Step 1 is 14-140 g / L. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0017] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the mass fraction of HCl in the hydrochloric acid solution described in step 2 is 36%. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a chlorination method for phenoxyacetic acid, which mainly solves the problems of high cost, low yield, poor selectivity and environment pollution of the existing phenoxyacetic acid prepared with the existing chlorination method for phenoxyacetic acid. The chlorination method comprises the following operation steps of: 1. preparing a phenoxyacetic acid solution; 2. carrying out electrolysis; and 3. purifying. The chlorination method has the advantage of simple step, is convenient to operate, is operated at the room temperature and does not need any catalyst so as to lower preparation cost; in addition, the chlorination method has good selectivity, and methyl 4-chlorophenoxyacetic acid, 2,4-dichlorophenoxy aceticaci and 2,4,6-trichlorophenoxyacetic acid can be prepared respectively under different electrolysis conditions with the respective yield of over 90%; and in the chlorination method, chlorine does not serve as a raw material, thereby causing small environment pollution. The chlorination method is mainly used for preparing methyl 4-chlorophenoxyacetic acid, 2,4-dichlorophenoxy aceticaci and 2,4,6-trichlorophenoxyacetic acid.

Description

technical field [0001] The present invention relates to a kind of chlorination method of phenoxyacetic acid. Background technique [0002] 2,4-Dichlorophenoxyacetic acid is a phenoxy plant growth regulator with auxin activity. It is mainly used to prevent flower and fruit drop, inhibit rooting of beans, promote fruit setting, induce seedless fruit, and accelerate ripening. Growth effect, commonly used in tomato fruit preservation, high dose has herbicidal effect. [0003] The traditional preparation method is to pass chlorine gas through phenoxyacetic acid under the catalysis of Lewis acid. The reaction temperature required by this method is 45°C to 75°C. The reaction process must strictly control the rate of chlorine gas introduction, which requires high equipment, so the conditions are harsh Cause production cost height, and this method reaction selectivity is low, and environmental pollution is serious; In order to avoid environmental pollution problem, prior art propose...

Claims

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Application Information

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IPC IPC(8): C25B3/06
Inventor 高艳由君刘波张娟段聪文
Owner HARBIN UNIV OF SCI & TECH
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