Method for removing nitrosamine from dinitroaniline herbicides

Abstract

The invention discloses a method for removing nitrosamine from dinitroaniline herbicides. The method comprises the steps of: adding a solvent, haloid acid and a remover methylsulfonic acid in the production synthesis process of raw dinitroaniline herbicide or a raw dinitroaniline herbicide product, and carrying out nitrous removal reaction to convert byproduct nitrosamine into a target product, such as trifluralin, pendimethalin, Amex820, oryzalin, dinitramine, isopropalin, bulab-37 and fluchloralin, so that the nitrosamine content is not more than 1.0ppm and achieves the export standard.

Description

technical field

[0001] The invention relates to a method for removing nitrosamines in dinitroaniline herbicides, belonging to the field of chemistry. Background technique

[0002] Dinitroaniline herbicides usually refer to 4-substituted (or 3,4-disubstituted) 2,6-dinitroaniline, which is a new class of herbicides, since the Trifluralin of Eli Lilly Company in 1960 Since its inception, after more than ten years of development, it has become a herbicide with many varieties and high yields. Dinitroaniline herbicides are soil treatment agents, mainly absorbed through the germinating shoots, and the root absorption is secondary. These herbicides bind to tubulin and inhibit microtubule polymerization at the growing end of tubules, resulting in loss of microtubules and inhibition of cell mitosis. Apply before sowing, before transplanting, or before seedlings after sowing. Widely used in crop fields such as rice, sugarcane, corn, potato, soybean, peanut, cotton, sunflower, tobac...