Application ADU 5: Distillation of Methanol

Distillation according to ASTM D1078 is used to determine the distillation range of methanol as specified in ASTM D1152.

To Assure the Product Quality

Organic liquids are used as solvents in many chemical processes.
The volatility of organic liquids can be used together with other tests for the identification and measurement of quality.

Therefore, this test method provides a test procedure for assessing compliance with specification.

Well Prepared for Quality Checks

The distillation range is the difference between the initial boiling point (IBP) and the dry point (DP), i.e. the difference between the temperature of the first drop of distillate and the last drop that evaporates from the bottom of the flask.

The distillation range of methanol is specified in ASTM D1152:
      °C (max): 1.0 (to include 64.6 +/- 0.1)

According to ASTM E346 the distillation range has to be determined as described in ASTM D1078.

ASTM D1078 Appendix X.1 discusses the effect of extraneous heat radiation to the dry point of low boiling solvents and allows the use of means whereby this effect could be greatly reduced.

For ADU 5 a low boiling solvents option was developed. It consists of an insulating plate to cover the standard heater board and a fan that is placed on top of this plate.
With this solution excellent results for the distillation range of low boiling solvents can be obtained.

Applied Program and Initial Heater Parameters

  • ASTM D1078, IBP 50 °C to 70 °C
  • K=0.033
  • Initial heating 1: 350 °C
  • Time for initial heating 1: 190 s
  • Initial heating 2: 700 °C

Necessary Accessories

106317 Distillation flask 200 mL
106631 Dry point sensor kit for 200 mL
106309 Heater board, center Ø 32 mm
146275 Low boiling solvent option incl. 164225 Insulating disk

Fig. 1: Option for low boiling solvents

Do you have any questions?

Contact Anton Paar ProveTec directly: support.provetec[at]anton-paar.com

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