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    • 99. 发明授权
    • Stabilized acrylic acid compositions
    • 稳定的丙烯酸组合物
    • US5728872A
    • 1998-03-17
    • US266330
    • 1994-06-27
    • Lutz Riemenschneider
    • Lutz Riemenschneider
    • C08F2/40C07C51/50C07C57/075C08F2/38C08F20/00C08F20/06C07C57/02
    • C07C51/50
    • A stabilized acrylic acid composition is provided in which the polymerization of the acrylic acid is inhibited during the distillation process for purifying or separating the acrylic acid as well as during transport and storage. The compositions of the present invention comprise three components: (A) acrylic acid, (B) a stable nitroxyl radical, e.g., the nitroxyl radical 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxy (CAS registry number 2226-96-2) (HTEMPO), and (C) a dihetero-substituted benzene compound having at least one transferable hydrogen, e.g., a quinone derivative such as the mono-methyl-ether of hydroquinone (MEHQ). During the distillation process, transport and storage, components (B) and (C) are present in a polymerization-inhibiting amount. During the distillation process, oxygen (D) is preferably added with components (B) and (C).
    • 提供了一种稳定的丙烯酸组合物,其中丙烯酸的聚合在蒸馏过程中被抑制以净化或分离丙烯酸,以及在运输和储存期间。 本发明的组合物包含三种组分:(A)丙烯酸,(B)稳定的硝酰基,例如硝酰基4-羟基-2,2,6,6-四甲基-1-哌啶基氧基(CAS登记号 2226-96-2)(HTEMPO)和(C)具有至少一个可转移氢的二杂异取代的苯化合物,例如醌衍生物,例如氢醌的单甲基醚(MEHQ)。 在蒸馏过程中,运输和储存,组分(B)和(C)以聚合抑制量存在。 在蒸馏过程中,氧(D)优选加入成分(B)和(C)。