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    Home > Chemicals Industry > Chemical Technology > Industrial Acetic Anhydride (3)

    Industrial Acetic Anhydride (3)

    • Last Update: 2021-11-17
    • Source: Internet
    • Author: User
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    4.


    4.


    Measure according to GB/T3049 regulations


    4.


    Pipette 100mL sample into a porcelain or glass evaporating dish, and evaporate it to dryness on a Buddha water bath


    4.


    The iron content X 2 expressed in mass percentage is calculated according to formula (2):


     

    Where: W—the amount of iron obtained from the standard curve, ug;

    V—volume of sample, mL;

    ρ—The density of the sample at 20°C, g/cm 3


    Take the arithmetic mean of the two parallel determination results as the determination result, and the difference between the two parallel determination results shall not exceed 0.


    4.


    Measure according to Appendix C (standard appendix)


    4.


    Measure according to the provisions of 3.


    Sample amount: 5.


    Take the arithmetic mean of the two parallel determination results as the determination result, and the difference between the two parallel determination results shall not exceed 2mg/100mL


    5 Inspection rules

    5.


    5.
    2 Industrial acetic anhydride should be inspected by the quality inspection department of the manufacturer
    .
    The manufacturer shall ensure that all manufactured products meet the requirements of this standard.

    5.
    3 The user has the right to inspect the products received in accordance with the provisions of this standard
    .

    5.
    4 Each batch of products that leave the factory should be accompanied by a quality certificate in a certain format
    .
    Its contents include: product name, product grade, manufacturer name, factory address, batch number or production date and the number of this standard
    .

    5.
    5 Industrial acetic anhydride products are a batch of homogeneous products of the same quality
    .
    One batch of barreled products is no more than 60t
    .
    Canned products are based on the unit packaging volume of truck or ship cans as a batch
    .

    5.
    6 Sampling of industrial acetic anhydride shall be carried out in accordance with the provisions of GB/T6678 and GB/T6680
    .
    The total sampling volume is not less than 2L, and after mixing evenly, divide it into two clean, dry 1L ground-mouth bottles
    .
    Label and indicate: product name, batch number, sampling date, sampler's name
    .
    One bottle is for inspection, and the other bottle is sealed and kept for two months for future reference
    .

    5.
    7 The test result is judged according to the rounding value comparison method in GB/T1250
    .
    If one of the inspection results does not meet the requirements of this standard, the barreled product shall be re-sampled from twice the number of packaging units for inspection, and the canned product shall be re-sampled at multiple points for inspection
    .
    Even if only one index does not meet the requirements of this standard as a result of the re-inspection, the entire batch of products will be considered unqualified
    .

    6 signs, packaging, transportation, storage

    6.
    1 The industrial acetic anhydride packaging container should have a firm and clear logo, which includes: product name, trademark, manufacturer name, site, net weight, batch number, number of this standard, and the "corrosive product" logo in compliance with GB190
    .

    6.
    2 Industrial acetic anhydride is packed in a tanker that meets the requirements of GB/T10479.
    It can also be packed in stainless steel ship tanks or plastic drums.
    The packaging containers should be clean and dry
    .

    6.
    3 Industrial acetic anhydride shall be protected from violent vibration during transportation and loading and unloading
    .
    Covers should be attached to the means of transport
    .

    6.
    4 Industrial acetic anhydride should be stored in a cool, ventilated and dry place, avoid sunlight, and keep away from fire and heat sources
    .
    Can not be stored together with organic acids and alkalis
    .

    7 security

    Industrial acetic anhydride is a transparent liquid with a pungent odor and strong corrosiveness.
    Its vapor has a special irritating effect on the eyes and respiratory tract.
    The maximum allowable concentration in the air does not exceed 20mg/m 3 , and the explosion limit when mixed with air It is 2.
    9%~10.
    3%
    .
    When packing and sampling, the operator should wear protective equipment, and immediately wash with alkaline soap or plenty of water when splashed on the skin or eyes to prevent burns
    .

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