Showing papers on "Dichlorophenylphosphine published in 2012"

Synthetic method of phosphorus-nitrogen intumescent flame retardant

Abstract: A synthetic method of a phosphorus-nitrogen intumescent flame retardant relates to a synthetic method of a flame retardant, which comprises the following steps: respectively dissolving raw materials of dichlorophenylphosphine and 4,4'-diaminodiphenylmethane in solvents, introducing inert gas, stirring, slowly and dropwisely adding the 4,4'-diaminodiphenylmethane solution into the dichlorophenylphosphine solution, after dropwise addition, performing reflux reaction for 2-10 hours, cooling, performing suction filtration, washing, and drying to obtain the light yellow powdery phosphorus-nitrogen intumescent flame retardant; the phosphorus-containing monomer and the nitrogen-containing monomer are combined into one compound through condensation polymerization reaction, and thus the flame retardant not only has good flame retardation, but also has the greatest advantage of good compatibility with polymer due to its large molecular weight The compound can be used as a flame retardant additive for various polymers to improve the flame retardation of the polymers According to the invention, the production process condition is simple; the product purity and yield are high; and the post-treatment process is simple

The deactivation and regeneration of HZSM-5 zeolite catalysts for synthesis of dichlorophenylphosphine in the gas phase

Abstract: The reaction that synthesis of dichlorophenylp-hosphine over the catalyst HZSM-5 zeolite catalyst in the gas phase was studied as the target. The deactivation and regeneration characteristics of HZSM-5 catalyst were studied by N2 adsorption-desorption, scanning electron microscopy (SEM), X-Ray diffraction, FT-IR, TG-DTG tests. The results revealed that the structure of HZSM-5 zeolite scarcely damaged in the catalyst deactivation and regeneration process. It was found that both coke deposition and local dealumination of tetrahedral framework aluminum were the crucial factors in the deactivation of HZSM-5. Due to the coke forming on the catalyst surface and dealumination , the pore mouth of zeolite channels were blocked. The coke consisted mainly of aromatic compounds which from product depth oxidation. Regeneration of HZSM-5 catalyst had high activity and stability for the target reaction.

Synthetic method of photoinitiator dual (2,4,6-trimethylbenzene formyl group) phenyl phosphine oxide

Abstract: The invention discloses a synthetic method of photoinitiator dual (2, 4, 6-trimethylbenzene formyl group) phenyl phosphine oxide. The synthetic method comprises processes of using dichlorophenylphosphine and 2, 4, 6-trimethylbenzene acyl chloride to serve as raw materials, conducting a classification reaction under protection of nitrogen to generate dual(2, 4, 6-trimethylbenzene formyl group) phenyl phosphine, oxidizing hydrogen peroxide to obtain a target object-dual (2, 4, 6-trimethylbenzene formyl group) phenyl phosphine oxide. Compared with the existing industrial production, the process has the advantages of being safe in operation process, free of needs of dangerous metallic sodium or potassium, free of needs of using inflammable midbody phenyl phosphine, simple in reaction process, safe, easy to control, high in obtained product yield, good in quality and prone to achieve mass production and the like.