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    • 4. 发明授权
    • Preparation of methacrylic acid
    • 甲基丙烯酸的制备
    • US5087744A
    • 1992-02-11
    • US213837
    • 1988-06-30
    • Richard KrabetzGerd DuembgenFranz MergerMichael JaegerFritz ThiessenHerbert Vogal
    • Richard KrabetzGerd DuembgenFranz MergerMichael JaegerFritz ThiessenHerbert Vogal
    • B01J27/19C07B63/04C07C51/00C07C51/235C07C51/25C07C57/055C07C57/07C07C67/00
    • C07C51/252
    • Methacrylic acid can be prepared with advantage by gas phase oxidation of methacrolein or isobutyraldehyde over Mo- and P-containing catalysts at from 250.degree. to 400.degree. C. with cooling of the hot reaction gas to below 100.degree. C., absorption of the methacrylic acid in a water-operated absorption column, at below 100.degree. C. and partial recycling into the oxidation reactor after admixture of methacrolein or isobutyraldehyde and oxygen by feeding a quantity of methacrolein or isobutyraldehyde equal to the quantity of methacrolein or isobutyraldehyde consumed in the reaction in liquid form together with a polymerization inhibitor into the reactor gas in the lower two-thirds of the absorber column and upstream of the feed point for the fresh methacrolein or isobutyraldehyde or down-stream of the absorption column splitting off the reactor off-gas a side stream which is washed in a wash column operated with water at
    • 甲基丙烯酸可以通过在250℃至400℃的含Mo和P的催化剂上甲基丙烯醛或异丁醛的气相氧化来制备,同时将热反应气体冷却至低于100℃,吸收甲基丙烯酸 酸在水性吸收塔中,低于100℃,并通过加入与反应中消耗的甲基丙烯醛或异丁醛的量相等的量的异丁烯醛或异丁醛,将甲基丙烯醛或异丁醛和氧气混合后,部分再循环进入氧化反应器 液体形式与聚合抑制剂一起在吸收塔的下三分之二的反应器气体中,在新鲜的甲基丙烯醛或异丁醛的进料点的上游或吸收塔的下游分离反应器废气a 侧流在洗涤塔中用水在<10℃下洗涤以除去未转化的异丁烯醛或异丁醛,其为f 作为吸收塔顶部的水溶液。
    • 7. 发明授权
    • Mass transfer in plate columns and apparatus for this purpose
    • 用于此目的的板柱和装置中的质量传递
    • US5788895A
    • 1998-08-04
    • US692189
    • 1996-08-05
    • Gerhard AltingerHorst EglyRudolf KaiserFritz Thiessen
    • Gerhard AltingerHorst EglyRudolf KaiserFritz Thiessen
    • B01D3/22B01D3/32B01J19/32C07C51/42C07C57/04B01F3/04
    • B01D3/324C07C51/42
    • Column tray for a mass transfer column, in particular one provided with a support ring at the circumference, which tray has support elements and tray plates arranged side by side on the support elements and having passages, in particular holes, valves or bubble caps, wherein the majority, preferably the total number, of tray plates are connected liquid-tight, preferably welded, to the support elements or the support ring, in particular in discrete area elements; the majority, preferably the total number, of support elements are connected liquid-tight, preferably welded, to one another and to the column wall or the support ring, in particular in discrete area elements; and in addition the majority, preferably the total number, of adjacent tray plates and support elements are separated from one another and from the column wall or the support ring by gaps having a width of from 1 to 15 mm, preferably from 1 to 7 mm.
    • 用于传质柱的塔盘,特别是在圆周上设置有支撑环的托盘,托盘具有支撑元件和托盘板,该支撑元件和托盘板并排布置在支撑元件上,并且具有通道,特别是孔,阀或气泡盖,其中 托盘板的大部分,优选总数优选地被焊接到支撑元件或支撑环上,特别是在离散区域元件中; 支撑元件的大部分,优选地,总数量液体密封,优选地焊接到彼此,并且连接到柱壁或支撑环,特别是在离散区域元件中; 此外,相邻的托盘板和支撑元件的大部分,优选地,总数彼此分离,并且从柱壁或支撑环分离出宽度为1至15mm,优选为1至7mm的间隙 。