System n-butanol

Fig. 2 HSCCC separation of colistin components. Solvent system n-butanol/0.04 M trifluoroacetic acid (1 1) mobile phase lower phase flow rate 2 mL/min detection 220 nm.

FIG. 15-45 Effect of tray overlap on baffle tray capacity. System n-Butanol d) + succinic acid + water (c). [Taken from Seibert, Lewis, and Fair, Paper No. 112a, AlChE National Meeting, Indianapolis (November 2002), with permission. Copyright 2002 AlChE. ]... 

Figure 2. Adsorption energy distribution F(Ei2) vs. E12 for the system n-butanol (1) from benzene (2) on silica gel at 298 K.

Separation over silica gel 60 Fj,<-precoated TLC plates (Merck, Darmstadt) in the solvent system n-butanol-n-propanol-glacial acetic acid-water (30 tO 10 10). The developed TLC plate is dried and sprayed with 25% trichloracetic add in chloroform. After heating for lOmin at 140°C, the plate is sprayed with a 1 1 mixture of 1% aqueous potassium... 

The glycone obtained by the enzymic hydrolysis of urochloralic acid has been identifiedl97 as D-glucuronic acid by T.L.C. on a layer of SilTca Gel GF2 H, using the solvent system n-butanol/acetic acid/water (4 5 1) and visualization by charring. 

Figure 8-2. Heterogeneous azeotrope system, n-butanol and water at 1 atmosphere tChii et al.. 1950). (A) Plotted as butanol mole fractons. (B) Plotted as water mole fractions.

Calculate the miscibility gap for the system n-butanol (l)-water (2) at 50°C and additionally the corresponding pressure and vapor phase composition using the... 

Munoz, L. A. L. Kraehenbuehl, M. A. Isobaric vapor liquid equilibrium (VLE) data of the systems n-butanol + butyric add and n-butanol + acetic acid J. Chem. Eng. Data 2001,46,120-124... 

Applied amounts Fructus Xanthii extracts each 10 pi Reference compound 10 pi Solvent system n-butanol + ethanol + glacial acetic acid + water (12 + 4 + 4 + 6)... 

A large number of different solvent systems have been used for paper chromatography of carbohydrates. Some of the most useful are listed in Table I. The system n-butanol(40)-ethanol(ll)-water(19) is also good (5). 

AiyIazido-/3-aIanine AMP was aynthesiaed using the same procedure as that described for the synthesis of arylazido- -alanine ATP except for the substitution of AMP for the ATP. One product with an R/ value of 0.63 was obtained with the solvent system n-butanol-water-acetic acid (5 3 2). 

TABLE III Chromatography of NAD+, AMP, NMN, AND AbYLAZIDO-0-ALANINE DERIVATIVES IN Solvent System n-BuTANOL-WATER-Acetic Acid (5 3 2) ... 

Solvent system n-butanol-acetic acid-chloroform (3 1 1) Temp.25 2C. Source. From Ref. 23. 

Remelli et al. (168) described a selector based on histidine. With this chiral selector L-hr-n-decylhistidine (Fig. 5(c)) the simultaneous enantiomeric separation of D,L-tiyptophan and D,L-phe-nylalanine was successfully performed on hydrophobic layers with MeOH-acetonitrile-THF-water (7.3 5.9 33.9 52.9, v/v/v/v) as eluent. Sinibaldi et al. (165) resolved D,L-dansyl amino acids on reversed phase TLC plates pretreated with a copper -complex of poly-L-phenylalanine amide (Fig. 5 (d)). The polymeric ligand was synthesized by the reaction of optically active amide with ethylene glycol diglycyl ether. The method makes use of a sophisticated liquid chroinatogr q)h for obtaining the desired polymer fraction which is subsequently used for the LEC, and this might limit the application of the separation procedure. However, a simple method is performed by Bhushan et al. (169). Here L-proline was used as a chiral selector on normal phase silica gel (169) and amino acids were resolved with the eluent systems n-butanol-acetonitrile-water (6 2 3, vWv), chloroform-meth-anol-propionic acid (15 6 4, v/v/v) and acetonitrile-methanol-water (2 2 1, v/v/v). 

Solvent system n-butanol-benzene-ethyl acetate (40 35 25). ST = slight tailing T = tailing. 

Quaternary Ammonium Salts, For lower members of the series the system n-butanol saturated with n HCl is the most suitable for higher members of the homologous series reversed phases must be used. One of the best is the solvent system lauryl alcohol/ethanol—N HCl (1 1). De-... 

Quitzseh, K. Koehler, S. Taubert, K. Geiseler, G. Isobare Fluessigkeit-Dampf-Gleiehgewiehte der quasi-idealen binaeren Systeme n-Butanol/sek.-Butanol und n-Butanol/tert.-Butanol. J. Prakt. Chem. 1969, 311, 429-437. 

Typical results are presented in Table 13.3 for the average absolute deviations in P AP) and y (Ay) - obtained by fitting all the experimental data with the two types of models - for the system n-butanol - toluene (Gmehling et al, 1982). 

Table 13.3 Quality of Data Representation for the System n-Butanol -Toluene at 70.25°C with Different Equations...

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