Unlock instant, AI-driven research and patent intelligence for your innovation.

Method of purifying a pesticide

A pesticide and impurity technology, applied in the field of pesticide purification, can solve the problem that the particle size of active pesticide components is difficult to reduce

Inactive Publication Date: 2005-07-20
BASF SE
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, active pesticide components with low melting points are difficult to achieve particle size reduction due to the lack of defined crystal structure, so the pesticides are destructively ground to achieve particle size reduction
In addition, mixed formulations containing a pesticide with a low melting point active ingredient and a pesticide with a high melting point active ingredient also suffer from the same problem

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of purifying a pesticide
  • Method of purifying a pesticide
  • Method of purifying a pesticide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1: the influence of impurity on crystallization

[0063] Batches 1A and 1B were melted at about 80°C and crystallized at 25°C and 50°C for one week, during which time the pesticide samples were placed on slides and covered with glass slides. Slides were placed in storage and observed at 24 hours and 168 hours. Visual observations are recorded in Table 1 after observation with a microscope using polarized light and wave plates at 400× magnification. Photographs of these samples are shown in Figure 2.

[0064] Batch 1A: methyl N-(2-{[1-(4-chlorophenyl)-1H-pyrazol-3-yl]oxymethyl}phenyl)-N-methoxycarbamate 92.99%; Toluene 0.094%

[0065] Batch 1B: methyl N-(2-{[1-(4-chlorophenyl)-1H-pyrazol-3-yl]oxymethyl}phenyl)-N-methoxycarbamate 96.90%; Toluene 0.510%

[0066] Batch

Storage temperature(℃)

Observation time (hr)

Observation results

Figure 2 photo

1A, 1B

N / A

0

no crystals appear

2A

1A

25

24 ...

Embodiment 2

[0069] Example 2: Effect of Grinding on Impurities

[0070] Batches 2A, 2B and 2C produced from batch 1B were treated with the process of the invention. The product was crystallized using a jet mill as indicated in Table 3.

[0071] Batch

Embodiment 3

[0072] Embodiment 3: the influence of impurity on crystallization

[0073] Batches 3A and 3B were produced from Batch 1B, and Batch 3C was produced from Batch 1A. All three batches were processed by the method of the present invention. Crystallization times were determined as shown in Table 4.

[0074] Batch

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
melting pointaaaaaaaaaa
melting pointaaaaaaaaaa
Login to View More

Abstract

The present invention describes a method of purifying a pesticide that includes: a) melting a pesticide, wherein the pesticide includes at least one active ingredient and at least one impurity capable of inhibiting crystallization; b) coating the pesticide on a substrate to form a pesticide particle; c) substantially reducing the amount of crys-tallization inhibiting impurity by an azeotropic method; and d) crystallizing the pesticide. In another embodiment, the present invention includes a method of purifying a pesti-cide as described above, such that the pesticide has a melting point of not more than about 90 DEG C. Also included in the invention is the product produced by the above proc-ess for the pesticide, methyl N-(2-{[1-(4-chlorophenyl)-1H-pyrazol-3-yl]oxymethyl} phenyl)N-methoxy carbamate.

Description

technical field [0001] The present invention relates to a process for the purification of pesticides, in particular, the present invention relates to the purification of pesticides comprising at least one impurity which inhibits crystallization. Background technique [0002] Pesticides are used in various formulations, including dry formulations such as wettable powders, granules and tablets. These dry formulas have some advantages, one of which is ease of use. Good bioefficacy usually requires a size reduction of the solid pesticide when mixed with water. However, active pesticide components with low melting points are difficult to achieve particle size reduction due to the lack of a defined crystal structure, so the pesticides are destructively ground to achieve particle size reduction. In addition, mixed formulations containing an active ingredient having a low melting point and an active ingredient having a high melting point also suffer from the same problem. Therefo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07D231/22A01N25/14A01N25/26A01N47/20A01N47/24
CPCA01N47/24A01N25/26A01N47/20A01N25/14A01N2300/00
Inventor C·W·芬奇K·E·费尔施
Owner BASF SE