Intermediates are a very important type of fine chemical products. They are essentially a type of "semi-finished products" that are intermediate products in the production of certain products. For example, if you want to produce a product, you can produce it from intermediates, saving costs and starting from being processed. It is widely used in the synthesis of medicines, pesticides, coatings, dyes and spices. In the pharmaceutical field, intermediates are an important link in the industrial chain of the pharmaceutical industry. They are used as some chemical raw materials or chemical products in the pharmaceutical synthesis process. In a word, they are used to produce APIs.
Pesticide intermediates are also intermediate media that combine two or more agricultural raw materials. Today, we mainly talk about pesticide intermediates.
Pesticides refer to a substance or several substances that are chemically synthesized or derived from organisms or other natural substances used to prevent, eliminate or control diseases, insects, weeds and other harmful organisms that harm agriculture and forestry, as well as to regulate the growth of plants and insects for purpose. 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. They are mainly used for crop protection; non-crop protection pesticides are mainly used for crop protection. Crop protection pesticides mainly include rodenticides, insect repellants, healthy mosquito control products, etc., and are mainly used in residential medicine, public health, forestry management, industrial mildew prevention, pest control, seasonal medicine, wood preservation, lawn protection and other fields.
The pesticide industry is at the end of the chemical industry chain and belongs to the fine chemical industry. The upstream of the pesticide industry chain is the petroleum/chemical industry, which provides raw materials for the pesticide industry; the midstream industry mainly includes intermediates, technical materials, and preparations; the downstream is agricultural applications and non-agricultural applications. The pesticide industry is highly dependent on technology, with large R&D investment, long cycle, high risks and low success rate. Under the contradiction of global population growth and reduction of cultivated land area, the widespread use of pesticides to increase output per unit area is an important way to solve the food problem.
Pesticides are important means of production in agricultural production and play an extremely important role in controlling diseases, insect pests and weeds, stabilizing and increasing crop yields. Although pesticide sales will show certain cyclical fluctuations from year to year due to the influence of agricultural product prices, planting area, climate, inventory and other factors, demand is still relatively rigid. According to data from the National Bureau of Statistics, the national chemical pesticide production has shown a downward trend since 2017. In 2017, the output of chemical pesticides was 2.941 million tons, which fell to 2.083 million tons in 2018. In 2019, the output of chemical pesticides stopped falling and increased, with an output of 2.2539 million tons, a year-on-year increase of 1.4%. In recent years, the sales revenue of my country's pesticide industry has maintained an overall upward trend. In 2018, thanks to the development of biopesticides and the increase in product prices, as well as the expansion of demand for pesticides in cash crops such as cotton and infrastructure fields, industry sales revenue was approximately 329 billion yuan; it is expected that the potential market size of China's agriculture in 2020 is still expected to grow Uptrend.
Different pesticides require different intermediates during the production process. The products produced by processing agricultural raw materials are also an intermediate medium that combines two or more substances. In pesticides, they can be understood as synergists, also known as organic intermediates. Initially refers to the intermediate products produced in the process of synthesizing chemical products such as spices, dyes, resins, drugs, plasticizers, and rubber accelerators using coal tar or petroleum products as raw materials.
The synthesis of intermediates is generally carried out in a reaction kettle, and the generated intermediates need to be separated and purified, usually by extraction technology. Chloroform extraction of pesticide intermediates is a common operating unit in chemical companies. The traditional operating process generally uses a distillation tower. This operation process is complex, the extraction efficiency is low, and the power consumption is high. Therefore, with the deepening of social division of labor and the development of production technology, With the advancement of technology, most companies have begun to carry out technological transformation and choose more effective processes for operations. Among them, solvent extraction method has begun to become the main operating unit of the extraction section in the chemical industry. The solvent extraction method is to select a suitable extraction agent, mix the raw material liquid and the extraction agent, transfer the organic phase in the raw material liquid to the extraction agent, and extract the organic phase after the two phases are separated. This method is simple to operate, has high extraction efficiency, and the extraction agent is cheap and easy to obtain. At the same time, the extraction agent can be recycled, effectively saving comprehensive investment costs.