Home Cosmetic Science Talk Formulating Advanced Questions CMIT MIT solution stability in CAPB

  • abdullah

    Member
    February 5, 2022 at 4:07 am

    @PhilGeis hello

    A question.

    I make 5kg of 100ppm hypochlorite solution by mixing 10g bleach with 4990g water. After sanitization i recycle and store the remaining solution and use it next time and next time.
    When the quantity left is not enough, i make another 5kg batch and mix it with this recycled one and use it. 

    My questions are

    1. Is there any time limit or recycling limit for this 100ppm hypochlorite solution like for how many days i can store it or how many time i can recycle it after sanitization of equipments? 

    2. Is it ok if i mix new batch with recycled one of 100ppm hypochlorite solution and use it? 

  • philgeis

    Member
    February 5, 2022 at 12:02 pm

    Don’t store -it’s not that stable.

  • abdullah

    Member
    February 5, 2022 at 1:21 pm

    PhilGeis said:

    Don’t store -it’s not that stable.

    Thanks a lot.

  • abdullah

    Member
    February 8, 2022 at 2:34 am

    @PhilGeis hi 

    If i sanitize equipments with isopropyl alcohol or ethanol,

    1. What percentage solution should be used?
    2. When should i sanitize equipments?
    3. How much contact time is needed?

    I asked this because sometimes specially for sanitizing small equipments for making samples 20 minutes sanitization is frustrating. So if alcohols need less time i may use that for samples.

  • philgeis

    Member
    February 8, 2022 at 8:26 am

    You must clean before sanitizing
    70-75%  - prefer ethanol
    before each batching
    let it evaporate - acts in seconds
    cover small items after sanitizing

    it is an explosion hazard so be aware of vapor buildup

  • abdullah

    Member
    February 8, 2022 at 9:14 am

    PhilGeis said:

    You must clean before sanitizing
    70-75%  - prefer ethanol
    before each batching
    let it evaporate - acts in seconds
    cover small items after sanitizing

    it is an explosion hazard so be aware of vapor buildup

    Thanks

  • philgeis

    Member
    February 8, 2022 at 9:26 am

    You need not immerse small pieces .  Spray,  ensuring you hit all surfaces,  and do watch for vapor buildup.

  • abdullah

    Member
    February 8, 2022 at 3:07 pm

    @PhilGeis i am spraying again and again everything except the pipes with hypochlorite for 20 minutes.
    The problem in that with small sample size was waiting 20 minutes every day for 100-500g sample that would be prepared in 5 minutes was frustrating. 
    Also since you said don’t store the 100ppm hypochlorite solution, preparing small amount each time was also a pain.

    I will try spraying small equipments for sample with alcohol.

    can you explain what is this vapor pressure?
    What causes it? 
    And how to prevent it?

    I will say during sanitization every equipment is open and not closed the way that gas can’t come out of it. 

  • philgeis

    Member
    February 8, 2022 at 4:20 pm

    20 minutes is not necessary with alcohol.  Just spray and allow to evaporate.  You can’t use it for large or closed vessels  and piping or tubing.

    You can’t control the vapor pressure and you want the alcohol to evaporate.  Just want enough ventilation.

  • abdullah

    Member
    February 9, 2022 at 2:05 am

    PhilGeis said:

    20 minutes is not necessary with alcohol.  Just spray and allow to evaporate.  You can’t use it for large or closed vessels  and piping or tubing.

    You can’t control the vapor pressure and you want the alcohol to evaporate.  Just want enough ventilation.

    I got your point. 
    Thanks

  • abdullah

    Member
    February 13, 2022 at 4:03 pm

    @PhilGeis will these trips work for chlorine test? 

  • philgeis

    Member
    February 13, 2022 at 5:26 pm

    yes

  • abdullah

    Member
    February 18, 2022 at 2:06 pm

    @PhilGeis hi 

    Should i sanitize the filling machine too or not necessary? 

  • philgeis

    Member
    February 18, 2022 at 2:23 pm

    Yes.  

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