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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。
    • 19. 发明申请
    • Storage tank for easily polymerizable compound and method of storage
    • 容易聚合的化合物储存罐和储存方法
    • US20050209482A1
    • 2005-09-22
    • US11133184
    • 2005-05-20
    • Shuhei YadaYasushi OgawaYoshiro SuzukiKimikatsu JinnoHirochika HosakaMasayasu Goriki
    • Shuhei YadaYasushi OgawaYoshiro SuzukiKimikatsu JinnoHirochika HosakaMasayasu Goriki
    • B01J4/00B01J19/00B65D90/00C07C51/42C07C51/50C07C57/04C07C67/48F16L23/00F17D1/08G05D7/00
    • B01J19/00B01J2219/00006B01J2219/00083B01J2219/00247B01J2219/00252B01J2219/00254Y10T137/0391Y10T137/6416Y10T137/6579Y10T137/85978
    • The storage tank of the invention for an easily polymerizable compound is a storage tank having an acceptance piping and a delivery piping and is characterized by having a circulation line which directly connects the acceptance piping to the delivery piping or having circulation lines which respectively connect the acceptance piping to the storage tank and the storage tank to the delivery piping; the method of storing of the invention is characterized by storing an easily polymerizable compound in the storage tank while circulating the compound in the storage tank through the circulation line(s); the method of pipe jointing and apparatus therefor of the invention are a method of jointing pipes fitted to a handling apparatus in a production apparatus, storage apparatus, or the like for the purpose of transporting a corrosive liquid, the method being characterized in that the pipes are jointed with flanges, bolts, and nuts made of a material having resistance to corrosion by the corrosive liquid; the process for (meth)acrylic acid compound production of the invention is a process for producing and/or purifying a (meth)acrylic acid compound, and is characterized in that the temperature of a purified (meth)acrylic acid compound obtained which is being supplied to a storage tank is regulated so as to be not higher than the temperature of the purified (meth)acrylic acid compound residing in the storage tank; and the process of the invention for producing an easily polymerizable compound which is a (meth)acrylic acid compound is characterized in that the temperature of a (meth)acrylic acid compound-containing liquid which has been discharged as an off-specification product and is being supplied to a storage tank is regulated so as to be not higher than the temperature of the off-specification liquid stored in the storage tank.
    • 用于易聚合化合物的本发明的储罐是具有接受管道和输送管道的储罐,其特征在于,具有将接收管道直接连接到输送管道的循环管线或具有分别连接接收的循环管线 管道到储罐和储罐到输送管道; 本发明的储存方法的特征在于,通过在循环管道中使化合物在储罐中循环而将容易聚合的化合物储存在储罐中; 本发明的管接头方法及其设备是在制造装置,储存装置等中装配于处理装置的管道的输送腐蚀性液体的方法,其特征在于,管道 与由腐蚀性液体具有腐蚀性的材料制成的法兰,螺栓和螺母接合; 本发明的(甲基)丙烯酸化合物的制造方法是(甲基)丙烯酸化合物的制造和/或纯化方法,其特征在于,得到的纯化的(甲基)丙烯酸化合物的温度为 调节供给到储罐的温度不高于存储在储罐中的纯化的(甲基)丙烯酸化合物的温度; 本发明的制备作为(甲基)丙烯酸化合物的易聚合性化合物的方法的特征在于,作为脱离规格的产品排出的(甲基)丙烯酸化合物的液体的温度为 被调节为不高于储存在储罐中的不合格液体的温度。