Home Cosmetic Science Talk Formulating Sulfonic acid + caustic soda neutralization

  • Sulfonic acid + caustic soda neutralization

    Posted by sanamine on October 11, 2021 at 2:33 pm

    Dear friends,

    I’m trying to neutralize sulfonic acid 96% (4,4KG) with 50% caustic soda solution (1,20KG) and i got a yellowish paste as result, so everything went well, after PH test it appears that sulfonic acid is fully neutralized. Now i would like to know what is the percentage of active matter in this resulting paste, is it 96% ?

    Thank you in advance, and sorry if i did mistakes french is my main language.

    Abdullah replied 2 years, 7 months ago 3 Members · 5 Replies
  • 5 Replies
  • ariepfadli

    Member
    October 11, 2021 at 4:05 pm

    did u mean ABS (alkyl benzene sulphonate)? each molecule LABSA (mw=329) need 3 molecule of lye (NaOH mw=40) just calculate it, it seem need 1540 gram NaOH, it should be resulted white with slightly yellowish paste

  • Abdullah

    Member
    October 12, 2021 at 4:00 am

    It is about 75% active

    75.428571428571%
  • sanamine

    Member
    October 12, 2021 at 9:01 pm

    Abdullah said:

    It is about 75% active

    75.428571428571%

    Thank you very much Abdullah. So, if i didn’t a mistake i suppose full resultants are : 
    Active content is (75%)
    Sodium sulfate approximately (2%)
    Water is (23%)

  • sanamine

    Member
    October 12, 2021 at 9:04 pm

    did u mean ABS (alkyl benzene sulphonate)? each molecule LABSA (mw=329) need 3 molecule of lye (NaOH mw=40) just calculate it, it seem need 1540 gram NaOH, it should be resulted white with slightly yellowish paste

    Exactely i meant alky benzene sulphonate, and as you said it resulted with a slightly yellowish paste. 

  • Abdullah

    Member
    October 13, 2021 at 3:50 am

    sanamine said:

    Abdullah said:

    It is about 75% active

    75.428571428571%

    Thank you very much Abdullah. So, if i didn’t a mistake i suppose full resultants are : 
    Active content is (75%)
    Sodium sulfate approximately (2%)
    Water is (23%)

    Important is active surfactant. 
    There maybe other things too. I don’t know. 
    You may add preservative too

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