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single column
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  single column
The control scheme is applied to an example reactive distillation column in which two products are produced in a single column and the reversible reaction A+B=C+D occurs.
      
A systematic method of obtaining model parameters for the SMB simulation from single column chromatography experiments was presented.
      
The possibility of applying SMB chromatography for the separation of 2,6-DMN and 2,7-DMN was investigated by numerical simulation based on the single column chromatography experimental data.
      
Differential mass balances which can extend a column model from a differential single column to an integral column and heat balances were suggested.
      
The mass transfer in a differential single column can be described by the Maxwell-Stefan equations.
      
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Organo-clay containing quaternary ammonium ion with long aliphatic chains shows specificity for the separation of xylene isomers, but ethylbenzene and p-xylene emerge as one peak and o-xylene is eluted before m-xylene. Octadecane has good resolving power for ethylbenzene and p-xylene, but it reverts the elution order of o- and m-xylene and its retarding force for o-xylene is not strong. Dinonyl phthalate has weaker resolving power for ethylbenzene and p-xylene, but stronger affinity for o-xylene. Appropriate...

Organo-clay containing quaternary ammonium ion with long aliphatic chains shows specificity for the separation of xylene isomers, but ethylbenzene and p-xylene emerge as one peak and o-xylene is eluted before m-xylene. Octadecane has good resolving power for ethylbenzene and p-xylene, but it reverts the elution order of o- and m-xylene and its retarding force for o-xylene is not strong. Dinonyl phthalate has weaker resolving power for ethylbenzene and p-xylene, but stronger affinity for o-xylene. Appropriate combination of the above three components either in a column of serial packing of individual component or in a single column of mixed substrates serves for the complete resolution of the four isomeric C_3 aromatics.

用一般的色谱固定液不能将八碳芳烃异构体中的间位和对位二甲苯很好地分开。含有长链脂肪族胺的有机粘土可以达到这个目的,但是它却不能分离乙苯和对二甲苯,同时邻二甲苯在间二甲苯之前流出。十八烷可以很好地分离乙苯和对二甲苯,但邻二甲苯在间二甲苯以后流出,而且它对于邻二甲苯的滞留作用不强。邻苯二甲酸二壬酯虽然对于乙苯和对二甲苯分离的作用不大,但对于邻二甲苯有较强的亲和力。因此,将上述三者适当地配合可以将八碳芳烃的四个异构体很好地分开。采用串联柱或混合固定液都可以达到上述目的。

This paper described a new technique in the analysis of inorganic anionsby single-column ion chromatography,in which neither suppressor column nor regener-ation of the resins is necessary.Low capacity anion exchange resins can be preparedfrom a commercially available porous ethylstyrene-divinylbenzene copolymer.With ben-zoate as eh(?)nt,fluoride,chloride and bromide can be separated,the fluoride and chloridepeaks being sharp but the bromide peak broad.When phthalate is used as eluent,the re-tention...

This paper described a new technique in the analysis of inorganic anionsby single-column ion chromatography,in which neither suppressor column nor regener-ation of the resins is necessary.Low capacity anion exchange resins can be preparedfrom a commercially available porous ethylstyrene-divinylbenzene copolymer.With ben-zoate as eh(?)nt,fluoride,chloride and bromide can be separated,the fluoride and chloridepeaks being sharp but the bromide peak broad.When phthalate is used as eluent,the re-tention time of these anions are reduced,and the fluoride peak is overlapped in the "in-jection peak",while chloride,bromide and sulfate peaks are distinctly separated.The re-tention time of anions and their peak height are greatly influenced by the concentrationand pH values of the eluent.The presence of cations in phthalate eluent will affect thesensitivity of detection (Li~+Na~+>K~+>NH_4~+.

本文所提出的单柱离子色谱分离阴离子混合物的技术,不用抑制柱,树脂也无需再生。用国产多孔乙基苯乙烯-二乙烯苯共聚物制备了不同交换度的低容量阴离子交换树脂。以苯甲酸盐为洗脱液,F~-、Cl~-、Br~-可以分离,F~-峰尖锐,Br~-峰较宽。以邻苯二甲酸氢盐为洗脱液,保留时间均减小,但F~-峰被进样峰所掩盖,Cl~-、Br~-、SO_4~-:可满意地得到分离,洗脱液的浓度和pH对阴离子分离的保留时间和峰高有较大的影响。邻苯二甲酸氢盐中不同的阳离子,由于它们的电导背景不同(Li~+Na~+>K~+>NH_4~+。

The dansyl amino acids have been separated by reversed-phase HPLC on a single column, using a four step elution procedure. The mobile phase effects involving pH and organic modifier have been investigated and, by an appropriate choice of these variables, a separation of the derivatives of the 24 amiuo acids can be made on a column Develosil ODS-5 or YWG-C18 in about 70 min. The fluorescence determination of the dansyl amino acids can be carried out routinely at the picomole level.

本文采用四段淋洗技术分离丹磺酰氨基酸的高效液相色谱法,考察了流动相的pH值和有机溶剂浓度的影响。选择适宜的分离参数,使用 Develosil ODS-5或 YWG-C_(18)柱,在70分钟左右分离了常见24种丹磺酰氨基酸,并在pmol水平上进行了测定。

 
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