Two-Step Membrane Gas Separation Process
    7.
    发明申请
    Two-Step Membrane Gas Separation Process 审中-公开
    两步膜气分离工艺

    公开(公告)号:US20150129413A1

    公开(公告)日:2015-05-14

    申请号:US14075578

    申请日:2013-11-08

    IPC分类号: B01D53/22

    摘要: A gas separation process for treating a gas stream containing vapors of condensable components. The process includes two membrane separation steps, the second step using membranes of lower selectivity than the first step. Advantageously, the first membrane separation step may be carried out outside the pressure-ratio-limited region and the second membrane separation step may be carried out within the pressure-ratio-limited region. The second residue stream is a desired product of the process, and the process is particularly useful for applications where the target concentration of component A in this product is low, such as below 1-2 vol %.

    摘要翻译: 一种用于处理含有可冷凝组分蒸汽的气流的气体分离方法。 该方法包括两个膜分离步骤,第二步使用比第一步低的选择性膜。 有利地,第一膜分离步骤可以在压力比限制区域的外部进行,第二膜分离步骤可以在压力比限制区域内进行。 第二残余物流是该方法的所需产物,并且该方法特别适用于该产品中组分A的目标浓度低,例如低于1-2体积%的应用。

    Process for producing ethanol
    9.
    发明授权
    Process for producing ethanol 有权
    生产乙醇的方法

    公开(公告)号:US08211679B2

    公开(公告)日:2012-07-03

    申请号:US12036859

    申请日:2008-02-25

    IPC分类号: C12P7/14

    摘要: Ethanol and other liquid products produced by contacting carbon monoxide (CO) and/or a mixture of CO2 (carbon dioxide) and H2 (hydrogen) with a microorganism in a bioreactor are separated using a combination of distillation and vapor permeation membranes. The bioreactor passes an effluent with an ethanol concentration of 1 to 6 wt % to a distillation column that produces an overhead vapor stream enriched in ethanol. A series of vapor permeation membranes retain ethanol as retentate and produce a 99 wt % or higher ethanol product. Ethanol depleted permeate streams flow back to the column and the bioreactor. Coupling a bioreactor with distillation and pervaporation efficiently and economically separates ethanol when present at low concentration in an aqueous fermentation broth. The separation arrangement may also include a flash zone ahead of the distillation column to raise the concentration of the ethanol in the input stream to the distillation column.

    摘要翻译: 使用蒸馏和蒸气渗透膜的组合分离通过使生物反应器中的一氧化碳(CO)和/或CO 2(二氧化碳)和H 2(氢)的混合物与微生物接触而产生的乙醇和其它液体产物。 生物反应器将乙醇浓度为1至6重量%的流出物通过蒸馏塔,蒸馏塔产生富含乙醇的塔顶蒸气流。 一系列蒸汽渗透膜将乙醇作为保留物保留,并产生99重量%或更高的乙醇产物。 乙醇贫化的渗透物流流回塔和生物反应器。 在含水发酵液中以低浓度存在时,使生物反应器与蒸馏和渗透蒸发有效并经济地分离乙醇。 分离装置还可以包括在蒸馏塔之前的闪蒸区域,以将输入流中的乙醇浓度提高到蒸馏塔。