초록 ▼

A process for purifying a polyalkylene ether, which comprises mixing a polyalkylene ether or a mixture of a polyalkylene ether and an organic solvent containing a heteropoly acid and/or its salt with at least one solvent for purification selected from hydrocarbons having 3 to 15 carbon atoms or halo

A process for purifying a polyalkylene ether, which comprises mixing a polyalkylene ether or a mixture of a polyalkylene ether and an organic solvent containing a heteropoly acid and/or its salt with at least one solvent for purification selected from hydrocarbons having 3 to 15 carbon atoms or halogenated hydrocarbons having 1 to 15 carbon atoms and separating by precipitation the phase composed mainly of the heteropoly acid and/or its salt, and a process wherein the polyalkylene ether or a mixture of a polyalkylene ether and an organic solvent containing a heteropoly acid and/or its salt is brought into contact with a solid adsorbent capable of adsorbing the heteropoly acid and/or its salt in the presence of at least one solvent for purification as described above, either further after the separation according to the process described above, or in the state unseparated. According to the present invention, the heteropoly acid and/or its salt dissolved in the polyalkylene ether or the mixture of the polyalkylene ether with the organic solvent can be removed efficiently in the form which can be reused. Further after the treatment with an adsorbent, the concentration of heteropoly acids in the polyalkylene ether can be reduced to extremely lower.

대표청구항 ▼

A process for purifying a polyoxytetramethylene ether which comprises the steps of: (1) mixing (A) a polyoxytetramethylene ether having a molecular weight of 500 to 5000, or a mixture of said polyoxytetramethylene ether and tetrahydrofuran, propylene oxide, ethylene glycol or neopentyl glycol, with

A process for purifying a polyoxytetramethylene ether which comprises the steps of: (1) mixing (A) a polyoxytetramethylene ether having a molecular weight of 500 to 5000, or a mixture of said polyoxytetramethylene ether and tetrahydrofuran, propylene oxide, ethylene glycol or neopentyl glycol, with (B) at least one solvent for purification selected from hydrocarbons having 3 to 15 carbon atoms or halogenated hydrocarbons having 1 to 15 carbon atoms; said polyoxytetramethylene ether or said mixture containing a heteropoly acid and/or its salt, said heteropoly acid being an oxy acid formed by condensation of at least one oxide of Mo, W or V with an oxy acid of P, Si, As, Ge, B, Ti, Ce or Co, the atomic ratio of said oxide to said oxy acid being 2.5 to 12; and a salt of an oxy acid; and (2) separating the phase composed mainly of said heteropoly acid and/or its salt from the mixture formed in step (1).