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首页> 外文期刊>Separation and Purification Technology >Ethylene/ethane separation and concentration by hollow fiber facilitated transport membrane module with permeation of silver nitrate solution
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Ethylene/ethane separation and concentration by hollow fiber facilitated transport membrane module with permeation of silver nitrate solution

机译：中空纤维对乙烯/乙烷的分离和浓缩促进了硝酸银溶液渗透的运输膜组件

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Novel hollow fiber facilitated transport membrane modules were used for ethylene/ethane separation using an aqueous silver nitrate solution as a carrier solution.In this membrane system,a feed gas consisting of 80 mol% C_2H_4 and 20 mol% C_2H_6 and an aqueous 4 M silver nitrate solution are supplied to the lumen side(high pressure side,feed side)of a hollow fiber ultrafiltration membrane module and flow upward.In the lumen,the solution absorbs C_2H_4 selectively to become a rich or laden solution.Some part of the rich solution permeates the membrane to the permeate side(low pressure side,shell side)and other part of the solution leaves the module from its top and then it is supplied to the top of the shell side,where the absorbed gas is stripped from the rich solution and recovered as enriched ethylene.The lean solution is circulated to the lumen of the hollow fiber module by a pump.The feed side pressure was from 200 to 500 kPa and the permeate side pressure was atmospheric.Three modules with different liquid permeability and design were used in experiments.The module,in which the carrier solution permeated the membrane at the upper part of the module,had higher performance than the module in which the solution permeated at the lower part.The module,in which the solution did not permeate the membrane,also had high performance although a large gas-liquid separator was needed downstream of the module.The module efficiency,which is defined as the ratio of the experimentally observed ethylene recovery to the recovery calculated by assuming gas-liquid phase equilibria at both sides of the membrane,was from 61 to almost 100%.Ethylene in the feed gas was concentrated from 80 to 99.8 mol%.The maximum C_2H_4 permeance was 1.1 x 10~(-4)molm~(-2)s~(-1)kPa~(-1)(3.3 x 10~(-4)cm~3 cm~(-2)s~(-1)cm Hg~(-1))and the selectivity of C_2H_4 over C_2H_6 was about 375 at the ethylene partial pressure of 164kPa.The maximum ethylene recovery was 87% when the mean residence time of the feed gas in the module was 4.9 s.The membrane was confirmed to be stable during a series of experiments.
机译：使用新型中空纤维促进传输膜组件，以硝酸银水溶液为载体溶液进行乙烯/乙烷分离。在该膜系统中，由80 mol％C_2H_4和20 mol％C_2H_6组成的进料气和4 M银硝酸盐溶液被供给到中空纤维超滤膜组件的管腔侧（高压侧，进料侧）并向上流动。在管腔中，溶液选择性地吸收C_2H_4成为浓溶液或载液。膜渗透到渗透侧（低压侧，壳侧），溶液的其他部分从其顶部离开模块，然后将其供应到壳侧的顶部，从富溶液中剥离吸收的气体通过泵将稀溶液循环到中空纤维组件的内腔中，进料侧压力为200至500 kPa，渗透侧压力为大气压。在实验中使用了不同的液体渗透性和设计。载体溶液渗透到模块上部的膜的模块的性能要比溶液渗透到下部的模块的性能高。其中溶液不渗透膜，尽管在组件下游需要使用大型气液分离器，但也具有较高的性能。组件效率定义为实验观察到的乙烯回收率与通过以下方法计算的回收率之比：膜两侧的气液相平衡为61％到几乎100％。进料气中的乙烯浓度从80％到99.8 mol％。最大C_2H_4渗透率为1.1 x 10〜（-4）molm〜（ -2）s〜（-1）kPa〜（-1）（3.3 x 10〜（-4）cm〜3 cm〜（-2）s〜（-1）cm Hg〜（-1））和选择性在乙烯分压为164kPa时，C_2H_4与C_2H_6的比约为375.当进料的平均停留时间达到最大时，乙烯的回收率为87％组件中的气体为4.9 s。在一系列实验中确认膜是稳定的。

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