There are many kinds of chemical raw materials and they are widely used. There are five to seven million chemicals in the world, and more than 100,000 chemicals are sold in the market. More than 1,000 new chemicals are produced every year, and 150 to 200 of them are considered carcinogens.Chemical raw materials can be divided into organic chemical raw materials and inorganic chemical raw materials.Folding organic chemical raw materials Hexylamine,DL-Benzoin,Triallylamine,Chlorendic Acid,Phthalhydrazide Xi'an Henrikang Biotech Co.,Ltd , https://www.henruikangbio.com
They can be classified as alkanes and their derivatives, alkenes and their derivatives, alkynes and their derivatives, quinones, aldehydes, alcohols, ketones, phenols, ethers, anhydrides, esters, organic acids, carboxylate, carbohydrates, heterocycles, nitrile, halogenates, aminoacyls, and others
Folding inorganic chemical raw materials The main raw materials of inorganic Chemical Products are sulfur, sodium, phosphorus, potassium, calcium and other chemical minerals (see inorganic salt industry), coal, oil, natural gas, air, water and so on. In addition, many byproducts and wastes of industrial sectors are also raw materials of inorganic chemical industry, such as coke oven gas in the coking production process of the iron and steel industry, which contains ammonia can be recycled into ammonium sulfate with sulfuric acid, and sulfur dioxide in the smelting waste gas of chalcopyrite, galena and sphalerite can be used to produce sulfuric acid.
How to calculate the cow's due date
In order to properly arrange production and properly maintain and manage different stages of pregnant cows, and to facilitate prenatal preparation, the cow's due date must be calculated. Calculation method: Generally, the pregnancy period of the cow is 280 days, and the method of “minus 3 plus 6†may be adopted, that is, the mating month is the breeding month minus 3, and the date of the calving is the date of the mating plus 6. For example, the last breeding time of a cow was July 15, 1998, and the cow's expected date of birth was April 21, 1999. The final breeding time for the other cow was January 29, 1998, and the cow's expected date of birth was November 4, 1998. Month: 1+12-3=October, date: 29+6=35 days (October 31 is November 4th). In production practice, in order to reduce cumbersome calculations, the cow's expected date of birth is often set as a cow's pregnancy calendar. Based on the date of mating, the cow's due date can be determined.