ISO 4626:2023
Volatile organic liquids — Determination of boiling range of organic solvents used as raw materials
This document specifies a method for determining the boiling range of liquids that boil between 30 °C and 300 °C at normal pressure, and that are chemically stable and do not corrode the apparatus during the distillation.
The method is applicable to organic liquids such as hydrocarbons, esters, alcohols, ketones, ethers and similar products.
NOTE 1 The method differs from that described in ISO 918 with respect to the volume of the distillation flask, the type of cooler and the distillation receiver.
NOTE 2 The method differs from that specified in ISO 3405 with respect to the volume of the distillation flask and the diameter of the hole in the flask support.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Sampling
7 Assembly and preparation of apparatus
7.1 Assembly
7.1.1 General
7.1.2 Position and choice of thermometer
7.1.3 Support for flask
7.1.4 Connection of flask to condenser
7.2 Filling of cooling bath
7.3 Adjustment of temperature of sample
8 Procedure
8.1 Test portion
8.2 Apparatus assembly
8.3 Operating conditions
8.3.1 General
8.3.2 Materials with boiling point below 150 °C
8.3.3 Materials with boiling point above 150 °C
8.4 Initial boiling point
8.5 Distillation
8.6 Dry point
8.7 End point
8.8 Atmospheric pressure
8.9 Recovery
8.10 Distillation loss
9 Notes on procedure
9.1 Factors causing superheating
9.2 Flame in contact with the flask
9.3 Application of heat
9.4 Extraneous heat source
9.5 Condition of equipment
9.6 Use of electric heaters
9.7 Safety precautions
9.7.1 Peroxide formation
9.7.2 Flammability
10 Calculations
10.1 Thermometer bore correction
10.2 Thermometer bulb shrinkage correction
10.3 Barometer correction
10.4 Combined corrections
10.5 Precision
10.5.1 General
10.5.2 Repeatability, r
10.5.3 Reproducibility, R
11 Test report
Annex A (normative) Thermometer to be used, normal boiling point and boiling point correction factor
Annex B (informative) Test for peroxides
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Sampling
7 Assembly and preparation of apparatus
7.1 Assembly
7.1.1 General
7.1.2 Position and choice of thermometer
7.1.3 Support for flask
7.1.4 Connection of flask to condenser
7.2 Filling of cooling bath
7.3 Adjustment of temperature of sample
8 Procedure
8.1 Test portion
8.2 Apparatus assembly
8.3 Operating conditions
8.3.1 General
8.3.2 Materials with boiling point below 150 °C
8.3.3 Materials with boiling point above 150 °C
8.4 Initial boiling point
8.5 Distillation
8.6 Dry point
8.7 End point
8.8 Atmospheric pressure
8.9 Recovery
8.10 Distillation loss
9 Notes on procedure
9.1 Factors causing superheating
9.2 Flame in contact with the flask
9.3 Application of heat
9.4 Extraneous heat source
9.5 Condition of equipment
9.6 Use of electric heaters
9.7 Safety precautions
9.7.1 Peroxide formation
9.7.2 Flammability
10 Calculations
10.1 Thermometer bore correction
10.2 Thermometer bulb shrinkage correction
10.3 Barometer correction
10.4 Combined corrections
10.5 Precision
10.5.1 General
10.5.2 Repeatability, r
10.5.3 Reproducibility, R
11 Test report
Annex A (normative) Thermometer to be used, normal boiling point and boiling point correction factor
Annex B (informative) Test for peroxides
Bibliography