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    • 12. 发明授权
    • Process for producing acrylic acid
    • 丙烯酸生产工艺
    • US5910607A
    • 1999-06-08
    • US508697
    • 1995-07-28
    • Yasuyuki SakakuraMasahiko YamagishiHirochika Hosaka
    • Yasuyuki SakakuraMasahiko YamagishiHirochika Hosaka
    • C07C51/46C07C57/07C07C51/21C07C51/235
    • C07C51/46
    • In a process for producing acrylic acid, wherein propylene and/or acrolein is catalytically oxidized with molecular oxygen in a vapor phase and the gas resulting from the oxidation is cooled and/or absorbed in water to form a crude aqueous acrylic acid, followed by azeotropic distillation to remove the water with an entrainer of a boiling point of no higher than 130.degree. C. on the crude aqueous acrylic acid which may have, upon necessity, undergone removal of aldehydes contained therein to produce acrylic acid purified in that the crude aqueous acrylic acid is substantially dehydrated, the improvement which comprises conducting the azeotropic distillation under such conditions that concentrations of the entrainer and water in the bottom product of the azeotropic distillation are from 5% to 30% by weight and no higher than 0.5% by weight, respectively, where the theoretical number of plates in the azeotropic distillation column for dehydration used and that in the distillation column for separating acetic acid used are preferably from 5 to 20. Highly-purified acrylic acid can thus be obtained from the crude aqueous acrylic acid without causing unfavorable polymerization of acrylic acid.
    • 在制备丙烯酸的方法中,其中丙烯和/或丙烯醛在气相中用分子氧催化氧化,并且由氧化产生的气体在水中冷却和/或吸收以形成粗水性丙烯酸,然后共沸 蒸馏以除去水,其中沸点不高于130℃的夹带剂在粗水性丙烯酸上,根据需要,可以将其除去其中所含的醛以产生纯化的丙烯酸,因为粗水性丙烯酸 酸基本脱水,其改进包括在共沸蒸馏的底部产物中的夹带剂和水的浓度分别为5重量%至30重量%且不高于0.5重量%的条件下进行共沸蒸馏 ,其中用于脱水的共沸蒸馏塔中的理论塔板数和蒸馏塔中的板的理论数量 所使用的分离乙酸优选为5〜20。因此,可以从粗水性丙烯酸获得高度纯化的丙烯酸,而不会引起丙烯酸的不利聚合。