ASTM E222-23
Standard Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation

Standard No.

ASTM E222-23

Release Date

2023

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM E222-23

Scope

1.1 These test methods cover the determination of hydroxyl groups attached to primary and secondary carbon atoms in aliphatic and alicyclic compounds and phenols. 1.2 Three test methods are given as follows: Sections Test Method A (Pressure Bottle Method) 8 – 14 Test Method B (Reflux Method) 16 – 22 Test Method C (Perchloric Acid Catalyzed Method) 24 – 30 1.2.1 Test Method A is recommended for general use. Test Method B is included to give a standard procedure for the method that has been used widely. Test Method C is recommended when the results are required in a minimum period of time or where ambient temperature for the reaction is desired. 1.2.2 The results obtained using Test Methods A and B will be essentially the same, but the results obtained using Test Method C will be higher (up to approximately 4 % relative) than those obtained using the other two methods. 1.2.3 Statements on precision are included with each test method. The precision of Test Methods A and C is consistent over a wide range of hydroxyl content (tested over hydroxyl number range of 250 to 1600), whereas Test Method B is less precise at the higher hydroxyl content level than it is at the lower hydroxyl content level. In general, Test Method A is approximately two-fold as precise as Test Method C. Test Method B has approximately the same precision as Test Method C at the lower hydroxyl content level but poorer precision at the higher hydroxyl content level. 1.2.4 The interferences are essentially the same for the three methods. Some compounds can be analyzed using Test Methods A or B but not using Test Method C because of interfering reactions of the strong acid catalyst with the compound being analyzed or the acetate product formed in the determination. However, because of its increased reactivity, Test Method C is applicable for determination of some compounds, particularly sterically hindered secondary alcohols, which react too slowly or not at all in Test Methods A and B. NOTE 1—Other methods for determination of hydroxyl groups are given in Test Methods D1957, D2195, E326, E335, and E567. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 In determining the conformance of the test results using this method to applicable specifications, results shall be rounded in accordance with the rounding off methods of Practice E29. 1.5 Review the current appropriate Safety Data Sheets (SDS) for detailed information concerning toxicity, first aid procedures, and safety precautions. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazards statements are given in Section 7. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM E222-23 Referenced Document

• ASTM D1193 Standard Specification for Reagent Water
• ASTM D1957 Standard Test Method for Hydroxyl Value of Fatty Oils and Acids
• ASTM D2195 Standard Test Methods for Pentaerythritol *， 2024-04-20 Update
• ASTM D6809 Standard Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
• ASTM E180 Standard Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals
• ASTM E200 Standard Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical Analysis
• ASTM E203 Standard Test Method for Water Using Volumetric Karl Fischer Titration
• ASTM E29 Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• ASTM E326 
• ASTM E335 
• ASTM E567 
• ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

ASTM E222-23 history

• 2023 ASTM E222-23 Standard Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation
• 2017 ASTM E222-17 Standard Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation
• 2010 ASTM E222-10 Standard Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation
• 2000 ASTM E222-00(2005)e1 Standard Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation
• 2000 ASTM E222-00 Standard Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation