- One-pot synthesis process of tri (tribromoneopentyl) phosphate flame retardant
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The invention discloses a one-pot synthesis process of a tri (tribromoneopentyl) phosphate flame retardant, and belongs to the technical field of tri (tribromoneopentyl) phosphate flame retardant production. The one-pot synthesis process comprises the steps that firstly, pentaerythritol, bromine and urea serve as raw materials to react to obtain tribromoneopentyl acetate, and then phosphorus oxychloride, a catalyst and an acid-binding agent are added into the tribromoneopentyl acetate to synthesize the tri (tribromoneopentyl) phosphate, so that the tri (tribromoneopentyl) phosphate does not need to be synthesized by taking tribromoneopentyl alcohol as a raw material after tribromoneopentyl alcohol is independently synthesized, so that the 'one-pot' synthesis of the tri (tribromoneopentyl) phosphate can be realized, the process is simplified, the production efficiency of the tris (tribromoneopentyl) phosphate is improved, and the large-scale industrial production of the tris (tribromoneopentyl) phosphate is facilitated. By reasonably controlling the raw materials, the reaction time, the temperature and other process parameters, the reaction time is shortened, and the yield and the purity of the product are improved.
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Paragraph 0022-0047
(2021/05/12)
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- Process for preparing halogenated trialkyl phosphate esters
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A method of producing a halogenated trialkyl phosphate ester which comprises admixing a halogenated hydroxy compound containing a halogen selected from the group consisting of bromine, chlorine, iodine and mixtures thereof, a phosphorus oxyhalide containing a halogen selected from the group consisting of bromine, chlorine, iodine and mixtures thereof, a solvent suitable to dissolve the halogenated hydroxy compound and the phosphorus oxyhalide, said solvent being substantially inert to hydrogen halide, and a catalyst suitable to increase the polarity of the phosphorus oxyhalide, refluxing said admixture sufficiently to form a trialkyl phosphate ester precipitate, and recovering this precipitate.
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