Monograph pubs.acs.org/doi/book/10.1021/acsreagents
n-Butyl Acetate Part 4, Monographs for Reagent Chemicals: General Descriptions, Specifications, and Tests eISBN: 9780841230460 Tom Tyner Chair, ACS Committee on Analytical Reagents James Francis Secretary, ACS Committee on Analytical Reagents
ABSTRACT This monograph for n-Butyl Acetate provides, in addition to common physical constants, a general description including typical appearance, applications, change in state (approximate), aqueous solubility, and density. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay and, Color (APHA), Residue after Evaporation, Titrable Acid, Substances Darkened by Sulfuric Acid, and Water.
CH3COO(CH2)3CH3
Formula Wt 116.16
CAS No. 123-86-4
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . . Density . . . . . . . . . . . . . . . .
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colorless, clear liquid solvent boiling point, 126 °F 0.7 g in 100 mL 0.88
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥99.5% CH3COO(CH2)3CH3 Maximum Allowable Color (APHA) . . . . . . . . . . . . . . . . . . . . . . . 10 Residue after evaporation . . . . . . . . . . . . . . . 0.001% Titrable acid . . . . . . . . . . . . . . . . . . . . . . . 0.0016 meq/g Substances darkened by sulfuric acid . . . . . . . . Passes test Water (H2O) . . . . . . . . . . . . . . . . . . . . . . . . 0.1% n-Butyl alcohol (C4H9OH) . . . . . . . . . . . . . . . 0.2%
© 2017 American Chemical Society
A
DOI:10.1021/acsreagents.4067 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Assay and n-Butyl Alcohol Analyze the sample by gas chromatography using the general parameters cited in [Part 2: Chromatography; Recommended Procedures; Gas Chromatography]. The following specific conditions are also required. Column . . . . . . . . . . . . . . . . . . . . . . . . . . Type I, methyl silicone Measure the area under all peaks, and calculate the area percent for n-butyl acetate and n-butyl alcohol. Correct for water content.
Color (APHA) [Part 2: Measurement of Physical Properties; Color (APHA); Procedure for Color (APHA)].
Residue after Evaporation [Part 2: Gravimetric Methods; Residue after Evaporation]. Evaporate 100 g (114 mL) to dryness in a tared, preconditioned dish on a hot plate (~100 °C), and dry the residue at 105 °C for 30 min.
Titrable Acid Neutralize 25 mL of reagent alcohol, to which 0.05 mL of bromthymol blue indicator solution has been added, with 0.01 N sodium hydroxide to a blue-green color. Add 25 g (28 mL) of the sample, mix, and titrate with 0.01 N sodium hydroxide to the same color. Not more than 4.0 mL of 0.01 N sodium hydroxide should be required.
Substances Darkened by Sulfuric Acid Cool 5 mL of the sample to below 10 °C. Cautiously add, dropwise, 5 mL of 95.0 ± 0.5% sulfuric acid. The color of the solution should not exceed that of a color standard composed of 9 volumes of water plus one volume of a color standard containing 3.25 g of cobalt chloride hexahydrate, 2.25 g of ferric chloride hexahydrate, and 3 mL of hydrochloric acid per 100 mL of solution.
Water [Part 2: Titrimetric Methods; Water by the Karl Fischer Method; Volumetric Procedure; Volumetric Procedure for Samples Using Karl Fischer Reagent, Method 1]. Use 25 g (28 mL) of the sample.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4067 ACS Reagent Chemicals, Part 4
