Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Dodecyl Alcohol (Lauryl Alcohol)
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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 Dodecyl Alcohol provides, in addition to common physical constants, a general description including typical appearance, applications, change in state (approximate), and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, Color (APHA), and Water.
CH3(CH2)11OH
Formula Wt 186.00
CAS No. 112-53-8
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
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off-white solid esterification agent melting point, 24 °C; boiling point, 259 °C insoluble
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥98.0% CH3(CH2)11OH Maximum Allowable Color (APHA) . . . . . . . . . . . . . . . . . . . . . . . 10 Water (H2O) . . . . . . . . . . . . . . . . . . . . . . . . 0.05%
TESTS Assay Analyze the sample by gas chromatography by using the general parameters cited in [Part 2: Chromatography; Recommended Procedures; Gas Chromatography]. The following specific conditions are also required.
© 2017 American Chemical Society
A
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4131 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
For the Assay
S a m p l e S o l u t i o n . Accurately weigh and transfer 0.10 g of the dodecyl alcohol into a 50-mL volumetric flask. Dissolve, and dilute to volume with hexanes. Mix well, and stopper.
Downloaded by CORNELL UNIV on June 14, 2017 | http://pubs.acs.org Publication Date (Web): February 28, 2017 | doi: 10.1021/acsreagents.4131
Column . . . . . . . . . . Column Temperature . Injector Temperature . Detector Temperature Sample Size . . . . . . . Carrier Gas . . . . . . . Detector . . . . . . . . .
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. Type 1, methyl silicone . 80–230 °C programmed at 10 °C/min, 5 min hold at 230 °C . 220 °C . 250 °C . 0.2 µL . Helium at 6 mL/min . Flame ionization
Measure the area under all the peaks after the solvent peaks, and calculate the dodecyl alcohol content in area percent. Relative retention for dodecyl alcohol to hexanes is approximately 8.8. Correct for water content.
Color (APHA) [Part 2: Measurement of Physical Properties; Color (APHA); Procedure for Color (APHA)].
Water [Part 2: Titrimetric Methods; Water by the Karl Fischer Method; Coulometric Procedure; Coulometric Procedure for Samples Using Karl Fischer Reagent, Method 2]. Use 1.0 mL (0.832 g) of the sample.
© 2017 American Chemical Society
B
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4131 ACS Reagent Chemicals, Part 4
