PROCESS FOR PRODUCTION OF ACRYLIC ACID
    1.
    发明申请
    PROCESS FOR PRODUCTION OF ACRYLIC ACID 有权
    丙烯酸生产工艺

    公开(公告)号:US20170036982A1

    公开(公告)日:2017-02-09

    申请号:US15227392

    申请日:2016-08-03

    申请人: BASF SE

    IPC分类号: C07C45/32 C07C45/82 C07C45/79

    摘要: The invention is related to a process for production of acrylic acid comprising the following steps: a) preparation of a product gas mixture by a catalytic gas-phase oxidation of at least one C3 precursor compound to acrylic acid, wherein acrylic acid is formed as a main product of the catalytic gas-phase oxidation and glyoxal is formed as a by-product and the product gas mixture comprises acrylic acid and glyoxal, b) cooling of the product gas mixture, c) contacting the product gas mixture in countercourrent with an absorbent, wherein an absorbate A, comprising the absorbent and absorbed acrylic acid, is formed, d) introducing a feed stream F (2) comprising at least part of the absorbate A into a rectification column comprising a rectifying section and a stripping section, e) enriching the absorbent in the stripping section and enriching acrylic acid in the rectifying section, f) withdrawing a stream C of crude acrylic acid comprising at least 90% by weight of acrylic acid out of the rectifying section as a side stream, wherein step c) is carried out in an absorption column (12) comprising at least two cooling loops, a first cooling loop (14), wherein a high boiler fraction of the product gas mixture is condensed and a second cooling loop (16), wherein a low boiler fraction of the product gas mixture is condensed, wherein a portion of the absorbate A, which comprises the feed stream F (2), is removed from the absorption column (12) at a side take-off (20), the side take-off (20) being located at the first cooling loop (14) or at a height of the absorption column (12) between the first cooling loop (14) and the second cooling loop (16) and wherein a temperature Tc of the absorbate A in the second cooling loop is at least 56° C.

    摘要翻译: 本发明涉及一种生产丙烯酸的方法,包括以下步骤:a)通过至少一种C3前体化合物的催化气相氧化制备产物气体混合物至丙烯酸,其中丙烯酸形成为 作为副产物形成催化气相氧化和乙二醛的主要产物,产物气体混合物包括丙烯酸和乙二醛,b)冷却产物气体混合物,c)将产物气体混合物与吸附剂 ,其中形成包含吸收和吸收的丙烯酸的吸收剂A,d)将包含至少一部分吸收剂A的进料流F(2)引入到包括精馏段和汽提段的蒸馏塔中,e)富集 汽提段中的吸收剂和精馏段中的富集丙烯酸,f)将粗丙烯酸流C包含至少90%(重量)的丙烯酸 其中步骤c)在包括至少两个冷却回路的吸收塔(12)中进行,第一冷却回路(14),其中产物气体混合物的高沸点馏分冷凝,和 第二冷却回路(16),其中产物气体混合物的低沸点馏分冷凝,其中包含进料流F(2)的吸收剂A的一部分在吸收塔(12)的一侧被去除 起落架(20),侧向起飞(20)位于第一冷却回路(14)处或位于第一冷却回路(14)和第二冷却回路(14)的吸收塔(12)的高度处 16),其中第二冷却回路中的吸收剂A的温度(Tc)至少为56℃。