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Bifenthrin purification and granulation method

A bifenthrin and granulation technology, applied in the chemical industry, can solve the problems of inability to form bifenthrin crystals, inability to prepare bifenthrin crystals and the like

Inactive Publication Date: 2017-08-11
JIANGSU HUANGMA AGROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the applicant has confirmed through experiments that the above method cannot prepare granular bifenthrin crystals at all, because the bifenthrin crude oil is dissolved by organic solvents and water, and once the stirring is stopped, stratification will occur, and the material layer is on the upper layer of the organic phase. , the lower layer is water, and bifenthrin crystals cannot be formed once separation occurs, even if high-speed shearing is used in this patent, the layering phenomenon cannot be avoided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0014] S1: Add 50g of bifenthrin crude oil, 40ml of n-hexane, 100ml of water and 5g of emulsifier into the stirring tank, stir and raise the temperature to 65°C, and keep warm for 0.5h under slight reflux until the bifenthrin crude oil is completely dissolve;

[0015] S2: Slowly cool down to 20°C at a cooling rate of 10°C / h, keep warm until bifenthrin crystals are precipitated on the wall of the kettle, and then keep warm for 1h;

[0016] S3: Slowly cool down to 5°C at a cooling rate of 2°C / h and keep warm for 2 hours;

[0017] S4: The granular bifenthrin with a specific gravity of 0.73 is obtained after discharging, centrifuging, and filtering and drying.

Embodiment approach 2

[0019] S1: Add 60g of bifenthrin crude oil, 36ml of n-hexane, 90ml of water and 3g of emulsifier into the stirring tank, stir and raise the temperature to 60°C, keep warm for 0.4h under slight reflux until the bifenthrin crude oil is completely dissolve;

[0020] S2: Slowly cool down to 15°C at a cooling rate of 8°C / h, keep warm until bifenthrin crystals are precipitated on the wall of the kettle, and then keep warm for 0.5h;

[0021] S3: Slowly cool down to 4°C at a cooling rate of 1°C / h and keep warm for 1.5h;

[0022] S4: The granular bifenthrin with a specific gravity of 0.65 is obtained after discharging, centrifuging, and filtering and drying.

Embodiment approach 3

[0024] S1: Add 100g of bifenthrin crude oil, 91ml of n-hexane, 250ml of water and 15g of emulsifier into the stirring tank, stir and raise the temperature to 70°C, and keep it warm for 0.6h under slight reflux until the bifenthrin crude oil is completely dissolve;

[0025] S2: Slowly cool down to 25°C at a cooling rate of 12°C / h, keep warm until bifenthrin crystals are precipitated on the wall of the kettle, and then keep warm for 1.5h;

[0026] S3: Slowly cool down to 6°C at a cooling rate of 3°C / h and keep warm for 2.5 hours;

[0027] S5: The granular bifenthrin with a specific gravity of 0.68 is obtained after discharging, centrifuging, and filtering and drying.

[0028] After drying the granular bifenthrin obtained in the above embodiments 1 to 3, fill a 100ml graduated cylinder, weigh it, and calculate the specific gravity; after drying the granular bifenthrin obtained in the above embodiments 1 to 3 , placed at 54°C for 14 days and at 0°C for 7 days to detect its therm...

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PUM

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Abstract

The invention relates to the field of chemical engineering and discloses a bifenthrin purification and granulation method. The bifenthrin purification and granulation method comprises the following steps that S1, bifenthrin crude oil, an organic solvent, water and an emulsifying agent are added into a stirring kettle, and stirring and heating are performed to 60-70 DEG C till the bifenthrin crude oil in the mixture is completely dissolved in a reflux state; S2, slow cooling is performed to reach 15-25 DEG C at the cooling speed of 8-12 DEG C / hour till a bifenthrin crystal precipitates on the wall of the kettle, and then heat preservation is performed for 0.5-1.5 hours; S3, slow cooling is performed to reach 4-6 DEG C at the cooling speed of 1-3 DEG C / hour, and heat preservation is performed for 1.5-2.5 hours; S4, granular bifenthrin is obtained after discharging centrifugation, filtering and drying. The granular bifenthrin can be obtained, the specific gravity is up to 0.65-0.75, the same size of packaging buckets can contain heavier bifenthrin, and thus the transportation cost is greatly reduced; the moisture content is smaller, the centrifugation time is short, the dust amount is small, and thus environmental pollution is reduced.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for purifying and granulating bifenthrin. Background technique [0002] Bifenthrin is a high-efficiency synthetic pyrethrin insecticide and acaricide. It mainly has contact and stomach poisoning effects, without systemic and fumigation effects. It has a wide insecticidal spectrum, rapid action, and long residual effect. It does not move and is safer for the environment. [0003] The control targets are various Lepidoptera larvae, whiteflies, aphids, and herbivorous spider mites. [0004] Most of the currently used bifenthrin is in powder form, and the specific gravity of the material is small (about 0.37g / cm3). First, it is easy to generate dust during drying, and the operating environment is poor; second, the packaging barrel used for factory packaging is relatively large. Large, occupying transportation area and increasing transportation cost; in addition, the purifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/52C07C67/62C07C69/743
CPCC07C67/52C07C67/62C07C69/743
Inventor 宦小马王新彬
Owner JIANGSU HUANGMA AGROCHEM
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