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Technique of preparing high-purity bentazone raw pesticide

A preparation process and technology, which is applied in the field of improving the preparation process of high-purity bentazone technical, can solve the problems of dust pollution and low purity, and achieve the effect of easy crystallization and drying

Inactive Publication Date: 2009-07-15
SUZHOU LINK HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because alkali and acid are used in the two processes, a large amount of saline waste water will be produced, and at the same time there will be dust pollution, and the purity is lower than 97%, sometimes only 82%.

Method used

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  • Technique of preparing high-purity bentazone raw pesticide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] As can be seen from the accompanying drawings, a kind of preparation technology of bentazone former medicine, its process step is as follows: A, in there-necked bottle, add the washed bentazone 75 grams, dichloroethane 700 grams to form BTZ-DCE solution 775 grams (about 621 liters); B. Place the three-neck bottle in hot water and slowly heat up to 60°C, and steam the DCE under reduced pressure;

[0018] C. After cooling with brine in a glass condenser, collect about 440 milliliters of fractions in a 1000 milliliter round bottom flask and stop;

[0019] D. Slowly cool to 35°C in tap water, then cool to -5°C with ice-salt water, and centrifuge;

[0020] E. Wash with a small amount of cold DCE and water, and dry in a vacuum oven to obtain a product (purity ≥ 97%).

Embodiment 2

[0022] As can be seen from the accompanying drawings, a kind of preparation technology of bentazone former medicine, its process step is as follows: A, in there-necked bottle, add the washed bentazone 75 grams, dichloroethane 700 grams to form BTZ-DCE solution 775 grams (about 621 liters); B. Place the three-neck bottle in hot water and slowly heat up to 60°C, and steam the DCE under reduced pressure;

[0023] C. After cooling with brine in a glass condenser, collect about 440 milliliters of fractions in a 1000 milliliter round bottom flask and stop;

[0024] D. Slowly cool in well water to 35°C, then cool to -5°C with ice-salt water, and centrifuge;

[0025] E. Wash with a small amount of cold DCE and water, and dry in a vacuum oven to obtain a product (purity ≥ 97%).

Embodiment 3

[0027] As can be seen from the accompanying drawings, a kind of preparation technology of bentazone former medicine, its process step is as follows: A, in there-necked bottle, add the washed bentazone 75 grams, dichloroethane 700 grams to form BTZ-DCE solution 775 grams (about 621 liters); B. Place the three-neck bottle in hot water and slowly heat up to 60°C, and steam the DCE under reduced pressure;

[0028] C. After cooling with brine in a glass condenser, collect about 440 milliliters of fractions in a 1000 milliliter round bottom flask and stop;

[0029] D. Slowly cool in mineral water to 35°C, then cool to -5°C with ice salt water, and centrifuge;

[0030] E. Wash with a small amount of cold DCE and water, and dry in a vacuum oven to obtain a product (purity ≥ 97%).

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Abstract

The invention discloses a preparation process of a high-purity bentazone without brine waste and dust pollution. The process comprises the following steps: adding a certain amount of bentazone (BTZ) and dichloroethane (DCE) which are washed by water to a three-necked flask to form BTZ-DCE solution, placing the three-necked flask in hot water, slowly heating to 60 DEG C, depressurizing to distill off the DCE, cooling by glass condenser brine, collecting a certain amount of distillate in a round-bottomed flask followed by stop, slowly cooling in water to 35 DEG C, further cooling with brine ice to minus 5 DEG C, centrifuging, washing with a little cold DCE and water, and drying in a vacuum drying oven to obtain the product. The preparation process has the following advantages: no brine waste is generated due to no application of alkali and acid, the crystal is easily dried, no dust pollution is produced, and the process totally meets the scientific development concept of energy-saving and emission-reduction.

Description

technical field [0001] The present invention relates to a kind of pesticide compound, especially relates to the improvement of a high-purity bentazone technical preparation process. Background technique [0002] At present, the preparation technology of bentazone (also known as bentazone) technical substance in the market is to use bentazone (BTZ) dichloroethane (DCE) solution alkaline extraction acidification water washing after synthetic washing, and alkaline extraction The essence of the two methods, such as acidification, extraction and concentration, is to remove impurities by alkaline extraction and acidification of BTZ-DCE solution. [0003] Because all adopt alkali, acid in these two kinds of crafts, therefore can produce a large amount of saline waste waters, have dust pollution again simultaneously, and purity is all lower than 97%, only has 82% sometimes. Contents of the invention [0004] Aiming at the above-mentioned technical defects, the present invention p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D285/15A01N43/828
CPCY02P20/10
Inventor 奚忠民
Owner SUZHOU LINK HI TECH
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