Butyl Alcohol
(bue' til al' ka hol).
Butyl Alcohol is n-butyl alcohol.
•  Butyl Ether
Sample:  Butyl Alcohol
Chromatographic system 
Mode:  GC
Detector:  Thermal-conductivity detector
Column:  6-mm × 2-m stainless steel column packed with 25% liquid phase G29 3,3¢-thiodipropionitrile on 30- to 40-mesh support S1C
Column temperature:  85
Carrier gas:  Helium
Flow rate:  75 mL/min
Injection size:  10 µL
Sample:  Sample
[Note—The retention times for butyl ether, 2-butanol, water, isobutyl alcohol, and butyl alcohol are approximately 6.0, 12.0, 17.0, 18.0, and 25.0 min, respectively. ]
Acceptance criteria:  The response due to butyl ether is NMT 0.2% of the sum of all of the responses.
•  Specific Gravity 841: 0.807–0.809
•  Distilling Range, Method II 721: Butyl Alcohol distills within a range of 1.5, including 117.7.
•  Acidity
Sample:  74 mL (60 g)
Analysis:  Titrate the Sample with 0.020 N alcoholic potassium hydroxide, using phenolphthalein TS as the indicator, until a pink color persists for NLT 15 s
Acceptance criteria:  NMT 2.5 mL is consumed
•  Limit of Nonvolatile Residue
Sample:  100 mL
Analysis:  Evaporate the Sample in a tared porcelain dish on a steam bath, and dry at 105 for 30 min
Acceptance criteria:  The weight of the residue does not exceed 4 mg (0.004%).
•  Aldehydes
Sample:  10 mL
Analysis:  To 10 mL of silver-ammonia-nitrate TS in a test tube add the Sample, and mix. Allow the mixture to stand in a dark place for 30 min
Acceptance criteria:  No color is produced, although a slight precipitate may form at the interface of the two layers.
•  Packaging and Storage: Preserve in tight containers, and prevent exposure to excessive heat.
Auxiliary Information— Please check for your question in the FAQs before contacting USP.
Topic/Question Contact Expert Committee
Monograph Robert H. Lafaver, M.S.
Scientific Liaison
(EXC2010) Monographs - Excipients
USP35–NF30 Page 1717