Process for the production of acrylic acid
    78.
    发明授权
    Process for the production of acrylic acid 失效
    丙烯酸生产工艺

    公开(公告)号:US5785821A

    公开(公告)日:1998-07-28

    申请号:US759219

    申请日:1996-12-05

    CPC分类号: C07C51/46

    摘要: The present invention provides an improved process for production of acrylic acid by subjecting propylene and/or acrolein to catalytic gas-phase oxidation with a molecular oxygen-containing gas. In the process, the mixed gas obtained by the catalytic gas-phase oxidation is contacted with an aqueous collecting agent containing acrylic acid, acetic acid and a poorly-soluble-in-water solvent, to form an aqueous acrylic acid solution; and the aqueous acrylic acid solution is subjected to azeotropic distillation in the presence of a poorly-soluble-in-water solvent to remove by-products and obtain high-purity acrylic acid.

    摘要翻译: 本发明提供通过使丙烯和/或丙烯醛与含分子氧的气体进行催化气相氧化来生产丙烯酸的改进方法。 在此过程中,将通过催化气相氧化获得的混合气体与含丙烯酸,乙酸和难溶于水的溶剂的含水收集剂接触,形成丙烯酸水溶液; 在难溶于水的溶剂的存在下,将丙烯酸水溶液进行共沸蒸馏,除去副产物,得到高纯度丙烯酸。

    Process for production of acrylic acid
    79.
    发明授权
    Process for production of acrylic acid 失效
    丙烯酸生产工艺

    公开(公告)号:US5739392A

    公开(公告)日:1998-04-14

    申请号:US557353

    申请日:1995-11-13

    摘要: Acrylic acid can be produced efficiently by subjecting acrolein to catalytic gas-phase oxidation in the presence of a molybdenum/vanadium-based oxide catalyst prepared by using particular substances as the raw materials of the individual metal elements constituting the catalyst. A preferable example of such a catalyst is prepared by using, as the raw materials of vanadium, ammonium metavanadate and at least one vanadium oxide in which the valency of vanadium is larger than 0 but smaller than 5; as the raw material of copper, copper nitrate; and, as at least part of the raw material(s) of antimony, at least one antimony oxide in which the valency of antimony is larger than 0 but smaller than 5.

    摘要翻译: 在通过使用特定物质作为构成催化剂的各个金属元素的原料制备的钼/钒基氧化物催化剂存在下,使丙烯醛进行催化气相氧化,可以有效地制备丙烯酸。 这种催化剂的优选实例是通过使用钒,偏钒酸铵和至少一种钒的化合物的原料,其中钒的价态大于0但小于5; 作为铜原料,硝酸铜; 作为锑原料的至少一部分,至少一种锑的价数大于0但小于5的氧化锑。

    Multimetal oxide compositions for gas-phase catalytic oxidation
    80.
    发明授权
    Multimetal oxide compositions for gas-phase catalytic oxidation 失效
    用于气相催化氧化的多金属氧化物组合物

    公开(公告)号:US5449821A

    公开(公告)日:1995-09-12

    申请号:US268504

    申请日:1994-06-30

    摘要: A process for the gas phase catalytic oxidation of a C.sub.3-6 alkane, alkanol, alkene or alkenal using as a catalyst multimetal oxide compositions of the formula I, [X.sup.1.sub.a X.sup.2.sub.b O.sub.x ].sub.p [X.sup.3.sub.c X.sup.4.sub.d X.sup.5.sub.e X.sup.6.sub.f X.sup.7.sub.g X.sup.2.sub.h O.sub.y ].sub.q, where X.sup.1 is bismuth, tellurium, antimony, tin and/or copper, X.sup.2 is molybdenum and/or tungsten, X.sup.3 is an alkali metal, thallium and/or samarium, X.sup.4 is an alkaline earth metal, nickel, cobalt, copper, manganose, zinc, tin, cadmium and/or mercury, X.sup.6 is iron, chromium, cerium and/or vanadium, X.sup.6 is phosphorus, arsenic, boron and/or antimony, X.sup.7 is a rare-earth metal, titanium, zirconium, niobium, tantalum, rhenium, ruthenium, rhodium, silver, gold, aluminum, gallium, indium, silicon, geranium, lead, thorium and/or uranium, a is from 0.01 to 8, b is from 0.1 to 30, c is from 0 to 4, d is from 0 to 20, e is from 0 to 20, f is from 0 to 6, g is from 0 to 15, h is from 8 to 16, x and y are numbers determined by the valency and frequency of the elements in I other than oxygen, and p and q are numbers whose ratio p/q is from 0.1 to 10, containing three-dimensional regions with a chemical composition X.sup.1.sub.a X.sup.2.sub.b O.sub.x which are delimited from their local environment due to their chemical composition which is different from their local environment, and whose maximum diameter is from 1 to 25 .mu.m.

    摘要翻译: 使用式I的催化剂多金属氧化物组合物[X1aX2bOx] p [X3cX4dX5eX6fX7gX2hOy] q进行气相催化氧化C3-6烷烃,链烷醇,烯烃或烯烃的方法,其中X1是铋,碲,锑, 锡和/或铜,X2是钼和/或钨,X3是碱金属,铊和/或钐,X4是碱土金属,镍,钴,铜,锰,锌,锡,镉和/或汞 X6是铁,铬,铈和/或钒,X6是磷,砷,硼和/或锑,X7是稀土金属,钛,锆,铌,钽,铼,钌,铑,银,金 ,铝,镓,铟,硅,天竺葵,铅,钍和/或铀,a为0.01至8,b为0.1至30,c为0至4,d为0至20,e为 0至20,f为0至6,g为0至15,h为8至16,x和y为除氧以外的I中的元素的化合价和频率确定的数,p和q为 数 s,其比率p / q为0.1至10,包含化学成分X1aX2bOx的三维区域,其化学成分与其局部环境不同,其局部环境由于其局部环境而界定,其最大直径为1〜 25亩。