Determination of Sulfate Ion in Natural Water, using Ion Exchange Resin and Disodiumethylenediamine-tetra-acetic Acid Reagent.

Abstract The fluorometric procedure for chlortetracycline in mixed feeds is based upon the degradation of chlortetracycline in alkaline solution to isochlortetracycline. The fluorescence of the isochlortetracycline is directly proportional to the concentration of chlortetracycline present prior to alkaline degradation. Chlortetracycline is extracted from mixed feeds with an acidmethanol solvent system, separated from the feed extract by adsorption on a Dowex 50 ion exchange resin, and eluted from the resin by ammonium hydroxide after conversion to isochlortetracycline. The isochlortetracycline is measured fluorometrically. Recoveries from known feeds are generally greater than 90% and agreements with microbiological assays are very close.

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The determination of lanthionine in amino-acid mixtures: the separation of its diastereoisomers on columns of ion-exchange resin

The Analyst ◽

10.1039/an9558000875 ◽

1955 ◽

Vol 80 (957) ◽

pp. 875 ◽

Cited By ~ 9

Author(s):

S. Blackburn ◽

G. R. Lee

Keyword(s):

Amino Acid ◽

Ion Exchange ◽

Exchange Resin ◽

Ion Exchange Resin ◽

Amino Acid Mixtures

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Kinetic Study of Esterification of Acetic Acid with n-butanol and isobutanol Catalyzed by Ion Exchange Resin

BULLETIN OF CHEMICAL REACTION ENGINEERING AND CATALYSIS ◽

10.9767/bcrec.6.1.665.23-30 ◽

2011 ◽

Vol 6 (1) ◽

Cited By ~ 4

Author(s):

Amrit Pal Toor ◽

Mamta Sharma ◽

Ghanshyam Kumar ◽

Ravinder Kumar Wanchoo

Keyword(s):

Acetic Acid ◽

Ion Exchange ◽

Kinetic Study ◽

Exchange Resin ◽

Ion Exchange Resin

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Ion-exchange-resin-catalyzed adamantylation of phenol derivatives with adamantanols: Developing a clean process for synthesis of 2-(1-adamantyl)-4-bromophenol, a key intermediate of adapalene

Beilstein Journal of Organic Chemistry ◽

10.3762/bjoc.8.23 ◽

2012 ◽

Vol 8 ◽

pp. 227-233 ◽

Cited By ~ 6

Author(s):

Nan Wang ◽

Ronghua Wang ◽

Xia Shi ◽

Gang Zou

Keyword(s):

Acetic Acid ◽

Ion Exchange ◽

Sulfonic Acid ◽

Exchange Resin ◽

Ion Exchange Resin ◽

Phenol Derivatives ◽

Resin Catalyst ◽

Acid Resin ◽

Free Process ◽

Sulfonic Acid Resin

A clean process has been developed for the synthesis of 2-adamantylphenol derivatives through adamantylation of substituted phenols with adamantanols catalyzed by commercially available and recyclable ion-exchange sulfonic acid resin in acetic acid. The sole byproduct of the adamantylation reaction, namely water, could be converted into the solvent acetic acid by addition of a slight excess of acetic anhydride during the work-up procedure, making the process waste-free except for regeneration of the ion-exchange resin, and facilitating the recycling of the resin catalyst. The ion-exchange sulfonic acid resin catalyst could be readily recycled by filtration and directly reused at least ten times without a significant loss of activity. The key intermediate of adapalene, 2-(1-adamantyl)-4-bromophenol, could be produced by means of this waste-free process.

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