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Production of Acrolein

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    الصورة الرمزية مهندس حنون
    مهندس حنون
    مهندس حنون غير متواجد حالياً

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    تاريخ التسجيل: Sep 2009
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    Production of Acrolein

    Production of Acrolein
    Background
    Acrolein is a highly toxic, flammable material with extreme lacrimatory
    properties. At room temperature acrolein is a liquid with volatility and flammability
    somewhat similar to acetone, but unlike acetone, its solubility in water is limited.
    Acrolein has been produced commercially since 1938. In 1995, worldwide-refined
    acrolein nameplate capacity was about 113,000 ton/yr. Because of its antimicrobial
    activity, acrolein has found use as an agent to control the growth of microbes in process
    feed lines, thereby controlling the rates of plugging and corrosion. Acrolein at a
    concentration of <500 ppm is also used to protect liquid fuels against microorganisms
    [1]. The goal of this project is to design a grass roots facility that will safely and
    efficiently produce 50,000 metric tons per year of acrolein from propylene, air, and
    steam.
    Process Description
    A base case PFD is shown in Figure 1. Propylene (Stream 2), steam (Stream 4),
    and compressed air (Stream 6) are mixed and heated to 250°C. The resultant stream
    (Stream 8) is sent to a catalytic packed bed reactor where propylene and oxygen react to
    form acrolein. The reactor effluent is quickly quenched to 50°C with deionized water
    (Stream 13) to avoid further homogeneous oxidation reactions. Stream 14 is then sent to
    an absorber, T-101, where it is scrubbed with water and acrolein is recovered in the
    bottoms (Stream 17). The off gas, Stream 16, is sent to an incinerator for combustion.
    Stream 17 is then distilled in T-102 to separate acrolein and propylene from water and
    2
    acrylic acid. The bottoms (Stream18) consisting of wastewater and acrylic acid are sent
    to waste treatment. The distillate (Stream 19) is sent to T-103 where propylene is
    separated from acrolein and the remaining water in the system. The distillate from T-
    103, contains 98.4% propylene. The possibility of recycling this stream can be
    investigated. The bottoms (Stream 21) is then sent to T-104 where acrolein is separated
    from water. Stream 23 is sent to waste treatment, and the distillate (Stream 22) consists
    of 98% pure acrolein.
    Necessary Information and Simulation Hints
    For safety reasons, the following criteria for the inlet composition to the reactor,
    R-101, must be strictly observed [2]:
    mol% inert must be > 40%
    mol% oxygen must be < 12%
    mol% propylene must be< 12%
    The temperature throughout the reactor must be kept below 330°C. At
    temperatures above 330°C, coke deposits form on the catalyst.

    The process was simulated using the UNIFAC thermodynamic package for Kvalues
    and SRK for enthalpy. Other thermodynamic packages considered for the k-value
    (SRK, Peng Robinson, UNIQUAC) suggested an azeotrope between acrolein and water
    which would not allow purification of the acolein to the purity obtained here. The
    formation of an azeotrope must be considered in the final design since this may have a
    substantial impact on the design of the separation system.

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  2. [2]
    مهندس المحبة
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    تاريخ التسجيل: Dec 2007
    المشاركات: 4,642

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