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    Home > Chemicals Industry > Chemical Technology > Method for determination of crystallization point of organic chemical products (2)

    Method for determination of crystallization point of organic chemical products (2)

    • Last Update: 2022-01-19
    • Source: Internet
    • Author: User
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    5 Installation of the instrument

    5.
    1 Heating bath: fill with heating medium

    .

    5.
    2 Cooling bath: fill with cooling medium

    .

    5.
    3 Dewar flask: Fill it with cooling medium and install it on a suitable seat

    .

    5.
    4 The location of the auxiliary thermometer: attach the ten main thermometer so that the mercury ball is located at half of the distance between the liquid surface of the main thermometer and the crystallization point temperature

    .

    5.
    5 The location of the main thermometer: fix it at the center of the crystallization nozzle with a cork or rubber stopper

    .
    The bottom of the mercury ball is more than 15mm away from the bottom of the crystallization tube

    .

    5.
    6 Position of the stirrer: Drill a hole in the stopper next to the main thermometer, and insert the stirrer into the crystallization tube from the hole so that it is located between the main thermometer and the wall of the crystallization tube.
    The three should not collide

    .

    5.
    7 The position of the bath thermometer: Pass through the hole on the asbestos plate cover and insert it into the medium in the bath so that the bottom of the mercury ball is 40mm away from the bottom of the bath

    .

    5.
    8 The position of the finished quality control tube: put it into the protective tube

    .

    5.
    9 Position of the protective tube: fixed on the center hole of the asbestos plate cover, perpendicular to the medium

    .

    6 Preparation of samples

    The liquid sample is directly sampled and poured into the crystallization tube
    .

    Put the solid sample into a jar or glass tube, close the stopper, put it in an oven or heating bath, control the temperature to be 10-15℃ higher than the crystallization temperature, make it all melted, spread it evenly, and pour it into the crystallization tube
    .

    At room temperature, solid samples such as small pieces, tablets, powders, etc.
    , are mixed, poured into a crystallization tube, and then placed in the protection tube of a heating bath towel.
    The temperature of the heating bath is controlled to be 10-15 ℃ higher than the crystallization temperature to make it all Melting

    .

    The samples that need to be dried before the measurement are dried with different desiccants according to the nature of the sample and the water content, and the method specified in the product standard is used for drying
    .

    Add the desiccant to the melted sample.
    The amount of desiccant is about one-half of the sample.
    Dry for 15-20 minutes at the same temperature as the melted sample, while shaking or stirring

    .
    Pour the dried upper liquid sample into the crystallization tube

    .
    Be careful not to bring in desiccant

    .

    Related links: Determination of the crystallization point of organic chemical products (1)

     

     

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