Paraphthalonitrile is a kind of phthalonitrile compound. Phthalonitrile is an important chemical product, mainly including m-phthalonitrile, o-phthalonitrile or p-phthalonitrile; As an excellent intermediate in organic chemistry, aromatic nitriles have been widely used in biology, medicine, pesticides, functional materials and other fields. Paraphthalonitrile is also an important chemical organic raw material. Paraphthalonitrile can be hydrogenated to obtain p-phenylenediamine, which is an important raw material of polyamide and a good curing agent for epoxy resin; The terephthalic acid can be obtained by hydrolysis of phthalonitrile, which can be used to produce polyester resin, polyester fiber, film, insulating paint, engineering plastics, plasticizer, etc; Tetrachloro-p-phenylenedinitrile can be obtained by reacting p-phenylenedinitrile with chlorine, and can be used to synthesize herbicides, insecticides and drugs.
White needle shaped crystal or powder. Insoluble in water, slightly soluble in ethanol, acetone and hot ether, soluble in hot benzene and hot acetic acid. Uses Used in organic synthesis, used in the production of medicine. Application An important organic intermediate, it is widely used in medicine and fuel production methods At present, there are two process routes for the production of p-phthalonitrile, using p-xylene as raw material and dipentene as raw material. At present, the production process using p-xylene as raw material is adopted in China. The reaction is carried out in a fluidized bed, the catalyst is B2O5-Cr2O3-MoO3-P2O5-SiO2, and the macroporous micro silica gel is used as the carrier. Ammonia oxidation is carried out at 375-390 ℃, the contact time is about 2h, the weight ratio of p-xylene to ammonia is 1:6-8, and the average yield is about 95%.
China
