How to prevent Sodium Sulfate Cryslazing in Detergent product

Tagged: sodium-sulfate-detergent-crystal

Formulating

How to prevent Sodium Sulfate Cryslazing in Detergent product

Posted by BILO on July 21, 2017 at 7:01 am

Hi,
We use sodium sulfate in our detrgent product, but it tends to crystalize into needles. We use the sodium sulfate as a filler. How to prevent this crystalization?

Chemist77 replied 6 years, 9 months ago 3 Members · 15 Replies
- sodium-sulfate-detergent-crystal
15 Replies

Chemist77

Member
July 21, 2017 at 12:03 pm

Presence of phosphonates is mentioned as one of the reasons for crystallization, what are other components here???
BILO

Member
July 21, 2017 at 12:15 pm
Hi.
The other components are in mixing sequence:
1. Water.
2. Caustic Soda 48%.
3. LABSA.
4. Sodium Silicate.
5. Sodium Carbonate.
6. Sodium Sulfate.
7. Calcium Carbonate.
8. Glycerine.
9. Dye.
10. Scent.
11. Formaline.
Chemist77

Member
July 21, 2017 at 1:36 pm

why glycerin, why no binder like CMC. Nothin looks out of sort here but you can do knock outs or replace Sodium Sulfate with STPP. Just a thought.
DRBOB@VERDIENT.BIZ

Member
July 21, 2017 at 2:19 pm

try a hydrotrope like SXS (sodium xylene sulfonate).
BILO

Member
July 21, 2017 at 2:36 pm

Hi Chemist77,

Glycerin is used as an emollient.
I will try your suggestion of replacing Sodium Sulfate with STPP and i will give you a feedback on that.
Thank you.
Chemist77

Member
July 21, 2017 at 6:12 pm

Dr. Bob do you think a hydrotrope would be suitable for a powder detergent? We generally advise SXS & SCS for liquid detergents where viscosity or solubility is an issue. Would appreciate your comments.
DRBOB@VERDIENT.BIZ

Member
July 21, 2017 at 9:05 pm

@Chemist77 A powder detergent-no-just for liquids as you say for viscosity and/solubility.
Chemist77

Member
July 22, 2017 at 5:20 am

Thank you Dr. Bob
DRBOB@VERDIENT.BIZ

Member
July 23, 2017 at 1:49 pm

anytime your welcome
BILO

Member
July 23, 2017 at 2:30 pm

Above is a picture of the final product with Sodium Sulfate crystal pieces clearly showing up.
By the way this is a paste product, not powder nor liquid.
BILO

Member
July 23, 2017 at 2:33 pm

Chemist77, replacing Sodium Sulfate with STPP will not be cost effective. The price of STPP is 4.5 times higher.
Chemist77

Member
July 23, 2017 at 3:57 pm

Try changing order of addition and if it is a paste then as Dr. Bob suggested use a hydrotrope.
BILO

Member
July 24, 2017 at 3:26 am

Thank you for the feedback. I need some clarifications:
Chemist77, Dr.Bob.

1. Do you mean by SCS Sodium Coconut Sulfate?

2. I found out that SLS Sodium Lauryl Sulfate is the equivalent to SCS. Can it be used as Hydrotrope?

3. How about SLES (Sodium Laureth Sulfate) can it replace the Sodium Coconut Sulfate? It is readily available and cheap.

Thank you in advance.
BILO

Member
July 25, 2017 at 5:29 am

hi.
i found it….mix Sodium Sulfate with water first and then add it to the mix slowly.
That is all it took.
Thank you for your feedback.
Chemist77

Member
July 25, 2017 at 7:36 am

And thank you BILO for sharing your outcome.