benzene is an excellent solvent with aromatic properties and is widely used in industry. however, it is toxic, so when used improperly or carelessly, …
substitution reaction main article: substitution reaction, electrophilic aromatic substitution reaction the hydrogen atoms on the benzene ring can b…
methods for separating toluene, aniline, phenol and benzoic acid first pass the mixture into nahco3 solution to separate benzoic acid. then pass the n…
scope and labeling of food additives definition of food additives the food safety law of the people’s republic of china stipulates that food add…
how to choose colorants for nylon? colorants are divided into two categories: pigments and dyes, of which pigments are divided into inorganic pigments…
research on the application of mdi in slow resilient polyurethane block foam 1. preface as we all know, polyurethane slow rebound foam is also called …
dye basics: identification of dyes introduction it is difficult to identify the type of dyestuff on textiles with naked eyes, and it must be determine…
dye basics: sulfur dyes introduction sulfur dyes are a class of sulfur-containing dyes with a complex molecular structure. generally made by certain a…
background and overview[1][2] 3-chloropropiophenone is a key intermediate in the synthesis of bupropion hydrochloride, dapoxetine, maraviroc and other…
what are the uses of flexible and rigid polyurethane foam? polyurethane rigid foam is a high polymer made of isocyanate and polyether as the main raw …
what is fermentation technology? according to the information and literature, fermentation technology mainly refers to: the use of microbial physiolog…
understanding cosmetic ingredients 1000’s without further ado, directly on the material! 111, resveratrol resveratrol is a colorless needle crys…