Synthesis And Process Optimization Of Bis(4-carboxyphenyl) Phenyl Phosphine Oxide

Because two carboxyl group and flame retardant element phosphorus exist in the molecular structure, Bis(4-carboxyphenyl) phenyl phosphine oxide(BCPPO) was applied as the reactive-type flame retardant for plastics of many polymers such as polyester , polyamide , cotton fiber and so on, or as flame retardant monomer to obtain flame retardant polymer material. Polymers had the properties of flame retardance, antistatic electricity, dyeability, thermal stability, oxidation stability and high glass transition temperature because of BCPPO, so it had a broad application prospect.This topic provided the basis of industrialization, according to optimizing every process condition, decreasing the production cycle and the consumption of expensive solvent to reduce production costs. The work and the study were as follows:(1) The synthesis of phenylphosphorus dichloride (DCPP)DCPP was synthesized, the feeding style of C6H6 and the appropriate mol ratio of all kinds of raw materials was determined.(2) The synthesis of bis(4-methylphenyl)phenyl Phosphine Sulfid (BMPPS)Process conditions of BMPPS were optimized. The appropriate mol ratio of all kinds of raw materials was determined, the reaction time was shortened, and rate of production of BMPPS was improved at the same time.(3) The measurement of the solubility of BMPPS in water and pyridine solutionHow the solubility of BMPPS would change was studied when the temperature elevated in the same solution and when mole fraction of pyridine increased at the same temperature.(4) The synthesis of productThe appropriate feeding temperature and reaction temperature were chosen. Some pyridine was replaced by low-cost water to cut down the consumption of expensive pyridine, the reaction time was shortened and the mole ratio of pyridine and water was determined, when the yield of BCPPO was high. So production costs were cut down.(5) The characterization of productThe ultimate product and intermediate product were inspected and synthesized by micro-melting point inspector, IR, UV, DSC, 1H-NMR technology.