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    Laminar flow process of preparing cellulose diacetate fibers
    3.
    发明授权
    Laminar flow process of preparing cellulose diacetate fibers 失效
    制备纤维素二乙酸纤维的层流工艺

    公开(公告)号：US5705631A

    公开(公告)日：1998-01-06

    申请号：US572910

    申请日：1995-12-15

    申请人： Michael Orlando Malcolm

    发明人： Michael Orlando Malcolm

    IPC分类号： D01D5/06 ,  D01F2/28 ,  C08B3/56

    CPC分类号： D01F2/28 ,  D01D5/06

    摘要： A laminar flow process for preparing cellulose diacetate fibers is disclosed. In the process, a precipitation-acid stream and an acid-dope stream are contacted in a zone having substantially laminar flow. The acid-dope stream is annularly disposed within and flows in the same direction as the precipitation-acid stream. The precipitation-acid stream has a temperature of 100.degree. to 200.degree. F. and comprises 25 to 35 percent by weight acetic acid and 75 to 65 percent by weight water. The acid-dope stream has a temperature in the range of 100.degree. to 200.degree. F. and comprised of 5 to 22 weight percent of cellulose diacetate having an inherent viscosity of at least 1.0, and 95 to 78 percent by weight of a mixture comprising 65 to 90 weight percent acetic acid and 35 to 10 weight percent water. The precipitation-acid stream has a linear flow greater than or equal to the linear flow of the acid-dope stream. The weight ratio of the precipitation-acid stream to the acid-dope stream is at least 9:1. Contacting the two streams in this manner causes precipitation of cellulose diacetate fibers of predictable diameter as the two streams diffuse together.

    摘要翻译： 公开了一种用于制备纤维素二乙酸酯纤维的层流方法。 在该过程中，沉淀酸流和酸 - 液体流在基本上层流的区域中接触。 酸 - 液体流环状地设置在与沉淀酸流相同的方向上并且与其相同。 沉淀酸流的温度为100〜200℃，含有25〜35重量％的乙酸和75〜65重量％的水。 酸性液体料流的温度范围为100至200°F，并且由5至22重量％的特性粘度至少为1.0的纤维素二乙酸酯和95至78重量％的混合物组成，所述混合物包含 65至90重量％的乙酸和35至10重量％的水。 沉淀酸流具有大于或等于酸 - 液体流的线性流动的线性流动。 沉淀酸流与酸性液体流的重量比至少为9：1。 以这种方式接触这两种物流，当两股流扩散在一起时，引起纤维素二醋酸酯纤维的析出。