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The superheating effect obtained from electric heaters may be s1078, but not completely eliminated, by selecting a heater that, by its design, concentrates the heating elements to a minimum area, and contains a minimum amount of ceramic material in its overall construction. Please fill this form, we will try to respond as soon as possible. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
When peroxide formation is likely because of chemical type or length of storage, the material should be analyzed for peroxides See Test Method E D — 01 Designation: Measure the volume and record it as residue. The temperature of the mercury in the thermometer is equilibrated with that of the refluxing liquid before the distillate is 1d078 over.
Originally published as D — 49 T.
Organic liquids are used as solvents in many chemical processes. In the operation of the distillation apparatus, use a suitable catch pan and shielding to contain spilled liquid in the event of accidental breakage of the distillation flask.
See Section 9 asgm factors that cause superheating, and Appendix X1 for a discussion on the use of electric heaters. We need your help to d108 this website. A number in parentheses indicates the year of last reapproval.
This standard has been approved for use by agencies of the Department of Defense. As the relative volatility, residual matter and recovery capability affect the efficiency of these processes, this test method is useful in manufacturing d1708. Your comments will receive careful consideration at a meeting of the responsible technical committee,1 which you may attend.
HDA 620: Distillation Analyzer
Do not allow any of the specimen zstm enter the vapor tube. When active decomposition is encountered, the rapid evolution of vapor and heavy fumes is usually followed by a gradual decrease in the distillation temperature.
Organic liquids are used as solvents in many chemical processes. Table 6 gives a summary of the relative bias observed for the samples used in the study. Record the readings of the distillation thermometer after collecting 5, 10, 20, ast, 40, 50, 60, 70, 80, 90, and 95 mL of distillate. These peroxides may present a violent explosion hazard when the axtm is distilled, especially as the dry point is approached.
Transfer the fresh specimen directly to the flask, allowing the receiver to drain for 15 to 20 s see Note 6. These should be used only after they have been proven to give results comparable to those obtained when using gas heat. No other units of measurement are included in this standard.
Other means can be employed, such as the use of a platinum-resistance thermometer or a National Bureau of Standards thermometer. Another technique is to distill pure toluene Have the bottom of d10778 flask resting firmly in the hole of the heat shield.
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ASTM D – 11 Standard Test Method for Distillation Range of Volatile Organic Liquids
Specific 3 D factors conducive to superheating are as follows, and should be avoided: As the relative volatility, residual matter and recovery capability affect the efficiency of these processes, this test method is useful in manufacturing d10778. Ten laboratories did automatic D distillation, and five laboratories did manual D distillation.
Mercury, or its vapor, may be hazardous to health and corrosive to materials.
As a general guide, it is recommended that: Center the thermometer into the neck of the flask through a tight-fitting cork stopper so that the upper end of the contraction chamber or bulb if Thermometer 2C or IP thermometer 62C is used is level with the lower side of the vapor tube at its junction with the neck of the flask.
The relative volatility of organic liquids can be used with other tests for identification and measurement of quality.
The observed bias if any are only for the samples studied and may not be necessarily applicable to other samples.