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    • 4. 发明授权
    • Process for purifying p-tolualdehyde
    • 对甲苯甲醛纯化方法
    • US3956394A
    • 1976-05-11
    • US510610
    • 1974-09-30
    • Susumu FujiyamaMinoru Takagawa
    • Susumu FujiyamaMinoru Takagawa
    • C07C47/542C07C45/00C07C45/46C07C47/52C07C67/00C07C45/24
    • C07C45/81
    • P-Tolualdehyde is separated with a high purify from a mixture of tolualdehyde isomers having a mole fraction of p-tolualdehyde of at least 0.27, on the basis of total tolualdehyde isomers by cooling the mixture to a crystallization temperature of -6.degree. to -60.degree.C, thereby crystallizing p-tolualdehyde, and separating the resulting p-tolualdehyde crystals from mother liquor. A solvent such as an aliphatic hydrocarbon having 1 to 9 carbon atoms or an alicyclic hydrocarbon having 3 to 9 carbon atoms can be added to the mixture before cooling to improve the crystallization conditions. The resulting crystals can be washed with a washing agent, such as said solvent, to remove the other isomers adhering to the crystals.
    • 通过将混合物冷却至-6℃至-60℃的结晶温度,从甲苯甲醛的摩尔分数至少为0.27的甲苯甲醛异构体的混合物中,以总甲苯甲醛异构体为基准,将P-甲醛从高纯度中分离出来 DEG,从而使对甲苯甲醛结晶,并将所得的对甲苯甲醛晶体与母液分离。 可以在冷却之前向混合物中加入溶剂如具有1至9个碳原子的脂族烃或具有3至9个碳原子的脂环族烃以改善结晶条件。 所得晶体可以用诸如所述溶剂的洗涤剂洗涤以除去附着在晶体上的其它异构体。