What Is An Intermediate?

Intermediates are a very important type of fine chemical product. They are essentially a kind of "semi-finished products", which are intermediates in the production of certain products. They are widely used in the synthesis of medicines, pesticides, coatings, dyes, and spices. Pesticide intermediates are intermediate media that combine two or more agricultural raw materials.

How to Get Pesticide Intermediates?

Pesticide refers to a substance or several substances that are chemically synthesized or derived from biological or other natural substances used to prevent, eliminate or control diseases, insects, grasses, and other harmful organisms that endanger agriculture and forestry, as well as purposefully regulate the growth of plants and insects. mixtures of substances and their preparations. Broadly speaking, pesticides are divided into crop protection pesticides and non-crop protection pesticides. Crop protection pesticides are mainly divided into herbicides, insecticides, fungicides, and plant growth regulators according to their uses, which are mainly used in agricultural protection; Crop protection pesticides mainly include rodenticides, insect repellents, health mosquito control products, etc., which are mainly used in residential drug use, public health, forestry management, industrial mildew control, pest control, seasonal drug use, wood preservation, lawn protection, and other fields.

Different pesticides require different intermediates in the production process. The product produced by the processing of agricultural raw materials is also an intermediate medium that combines two or more substances. In pesticides, it can be understood as a synergist, also known as an organic intermediate. Originally refers to the intermediate products produced in the process of synthesizing chemical products such as spices, dyes, resins, drugs, plasticizers, rubber accelerators, etc. using coal tar or petroleum products (solvent oil) as raw materials.

The synthesis of intermediates is generally carried out in a reaction kettle, and the generated intermediates are to be separated and purified, usually by extraction technology. Chloroform extraction of pesticide intermediates is a common operation unit in chemical enterprises. The traditional operation process generally adopts rectification tower operation. This operation process is complicated, the extraction efficiency is low, and the power consumption is large. Therefore, with the deepening of the social division of labor and the development of production technology. The solvent extraction method is to select a suitable extractant, mix the raw material liquid with the extractant, transfer the organic phase in the raw material liquid to the extractant, and extract the organic phase after the two phases are separated. This method has the advantages of simple operation, high extraction efficiency, cheap and easy-to-obtain extractant, and at the same time, the extractant can be recycled, which effectively saves the comprehensive input cost.