echemi logo
Product
  • Product
  • Supplier
  • Inquiry
    Home > Chemicals Industry > Chemical Technology > Industrial methylamine aqueous solution test method (1)

    Industrial methylamine aqueous solution test method (1)

    • Last Update: 2021-12-11
    • Source: Internet
    • Author: User
    Search more information of high quality chemicals, good prices and reliable suppliers, visit www.echemi.com

    1 Scope

    This standard specifies the test methods for amine aqueous solutions in industry


    This standard is applicable to the determination of the aqueous solution prepared by methylamine produced by the continuous gas-phase catalytic ammoniation of methanol


    2 Reference standards

    The provisions contained in the following standards constitute the provisions of this standard through quotation in this standard


    GB/T6682-1992 Analytical laboratory water specifications and test methods (neq ISO 3696: 1987)

    3 Test method

    The reagents and water used in this standard, unless other requirements are specified, use analytical reagents and secondary water that meets GB/T6682


    3.


    Inject 25 mL of methylamine sample into a 50 mL plugged colorimetric tube, and observe sideways under sufficient light


    3.


    3.


    The first step uses hydrochloric acid standard titration solution to determine the total alkalinity of the methylamine aqueous solution; the second step uses gas chromatography to determine the impurities in the solution


    3.


    3.


    3.


    3.


    3.


    Use a 1 mL syringe with a No.


    3.


    The total alkalinity (X) expressed as the mass percentage of the main amine is calculated according to formula (1):

    Where: V——Volume of hydrochloric acid standard titration solution consumed in titration, mL;

    C——The actual concentration of hydrochloric acid standard titration solution, mol/L;

    m——the mass of the sample, g;

    M——The mass of main amine expressed in grams equivalent to 1.
    00mL hydrochloric acid standard titration solution [c(HCl)=1.
    000mol/L], monomethylamine is 0.
    03106, dimethylamine is 0.
    04508, and trimethylamine is 0.
    05911
    .

    3.
    2.
    2.
    4 Allowable difference

    Take the arithmetic average of the two measurement results as the measurement result
    .
    The difference between the two parallel determination results is:

    Monomethylamine≤0.
    06%; Dimethylamine≤0.
    09%; Trimethylamine≤0.
    12 %
    .

    Related Links: Determination of Ursolic Acid Purity—High Performance Liquid Chromatography (2)

     

     

    This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

    Contact Us

    The source of this page with content of products and services is from Internet, which doesn't represent ECHEMI's opinion. If you have any queries, please write to service@echemi.com. It will be replied within 5 days.

    Moreover, if you find any instances of plagiarism from the page, please send email to service@echemi.com with relevant evidence.