Adsorptive separation and recovery of biobutanol from ABE model solutions
Adsorptive separation and recovery of biobutanol from ABE model solutions
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DOI：
10.1007/s10450-015-9661-0
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发表时间：
2015-04-01
影响因子：
3.3
通讯作者：
Thibault, Jules
中科院分区：
文献类型：
--
作者：
Abdehagh, Niloofar;Gurnani, Priya;Thibault, Jules
吸附法是从稀发酵液中分离丁醇的最节能的技术之一。为了开发高效的丁醇吸附工艺，吸附和解吸同样重要，因为能够解吸吸附的丁醇以产生高浓度的丁醇产品是至关重要的。尽管有大量的研究为这一过程寻找合适的吸附剂，但只有很少的研究考虑了脱附过程。本研究选用活性炭F-400作为丁醇吸附剂，因为它具有较高的吸附速率和吸附容量，并且在存在其他发酵液成分的情况下对丁醇具有选择性。在吸附-解吸循环中对丁醇-水和丙酮-丁醇-乙醇（ABE）模型溶液进行热解吸。在1.5 wt%的进料丁醇-水二元溶液中，丁醇的吸附量和丁醇的回收率基本稳定（分别为302 mg/g和84%），表明吸附的丁醇被全部解吸，吸附柱在不同的循环中都能保持其初始吸附量。ABE模型溶液中分别含有1.2、0.5、0.2、0.5、0.5、0.4和0.4 wt%的丁醇、丙酮、乙醇、丁酸、乙酸、葡萄糖和木糖，丁醇分离效果相似。对丁醇的吸附量为170 mg/g，回收率为80%。
Adsorption is one of the most energy efficient techniques for butanol separation from dilute fermentation broths. To develop an efficient butanol adsorption process, adsorption and desorption are equally important since it is paramount to be able to desorb the adsorbed butanol to produce a high concentration butanol product. Although there are a good number of investigations done to find suitable adsorbents for this process, only few studies considered the desorption process. In this study, activated carbon F-400 was used as the butanol adsorbent since it has a high adsorption rate and capacity and is selective to butanol in the presence of other fermentation broth components. The thermal desorption process was performed in adsorption-desorption cycles both for butanol-water and acetone-butanol-ethanol (ABE) model solutions. The results for 1.5 wt% feed butanol-water binary solutions showed that the butanol adsorption capacity and the recovery of butanol were fairly constant (around 302 mg/g and 84 %, respectively) in subsequent adsorption-desorption cycles confirming that all the amount of adsorbed butanol is desorbed and the adsorption column could preserve its initial adsorption capacity in different cycles. Similar performance was obtained for butanol separation from the ABE model solution containing 1.2, 0.5, 0.2, 0.5, 0.5, 0.4 and 0.4 wt% butanol, acetone, ethanol, butyric acid, acetic acid, glucose and xylose, respectively. The adsorption capacity and recovery for butanol were 170 mg/g and 80 %, respectively.