[Fekher]

Trying o/w emulsion the ph of ZnO dispersion is superior then 7

[Fekher]

Any idea please?

[Fekher]

As written I guess A but it seems that some ingredients are missing in B

[Fekher]

Is it for hair?

[Fekher]

@KRISTIANA any answer after giving the laboratory details? then when the recirculation is needed? And What is the best cooling rate for emulsion according to you?

[Fekher]

the batch in laboratory is 100 grammes with turbine agitator.

There is no recirculation system in industrial batch. (is the equipment is qualified I already make description if you can share your opinion about that question)
The process is described in specific paper for sure with all details… And the operator is doctor in chemistry.

Cooling speed for laboratory it needs just an hour to decrease from 75 to 40 °C however in industrial batch it needs more then 4 hours.

Wich rest you will check the droplets of emulsion and what will benifit knowing that?

[Fekher]

Thanks

[Fekher]

@Herbnerd thanks a lot for you interesting share, I want to know why your preference is sodium cmc and according to what you chose sush surfactants?

[Fekher]

@chemicalmatt Can you tell me what are the heavy oils please?

[Fekher]

@chemicalmatt any idea about the stability of Glyceryl Stearate S.E. @ 4.0% | Polysorbate 80 at 1.5% please.

[Fekher]

For Gms Se 4% and polysorbate 80 1.5% the hlb of the emulsifiers is inferior then 8 will this system lead to a stable o/w emulsion?

[Fekher]

Gms se alone will not lead to stable emulsion.

[Fekher]

Wich is your level of ethoxylated ingredients?

[Fekher]

I already read about high ethoxylated product and deactivation of phenoxyethanol in scientific pdf paper just I forgot the reference if I find it I will share that.

[Fekher]

Not for all batches we find problem .
how to reheat and mix ? as heating nothing special same for mixing.
About mixing in cool down i guess it is true accordiong to older production.

[Fekher]

1) batch size almost 300 kg mixing with both anchor agitator and Turbine agitator placed in the bottom of the tank ( i have also dobt that bad ratio made between (turbine diameter/tank diameter) is bad , in bibliography ratio almost superior then 0.25 in our case it is inferior then 0.20 even the place of turbine in the bottom is not the adequat place according to what i saw in my class and bibliography (generally it is placed higher then the bottom ) @Juggsy any comment about these details i will be soo thankful .
About heating and cooling it is double wall tank .

2) As described , yes with mixing by turbine.

3) You ask about frequence ? the question is not clear for me if you can explain more.

[Fekher]

@Juggsy thanks a lot for your awsome answer and explanation really very informative. About brevity, reading your answer i wanted to read more and find longer answer🙂❤️. Keep sharing interesting details and sush on long answers because they are a real tresor.

[Fekher]

at high ph it has sure the strong power from sodium hydroxide however by neutralizing the base by citric acid the power will decrease normally.

[Fekher]

yes that’s answer just the difference between laboratory and industrial scale and it is for sure what you said.however my two questions are not about that .

the first is why in industrial size and trying to maintain same process we get important difference in viscosity in differents baches (some have lower viscosity then desired one)

the second question why the batches have lower viscosity become fine in industrial scale by reheating to 50 C degree and even lower with mixing?

Any expert have explaination or even doubts my helps ? thanks in advance

[Fekher]

may it contains important quantity of sodium hydroxide .

[Fekher]

Ph 10 and and needs 3,5% Citric acid to drop to 7 normally it must contains not sited base.

[Fekher]

Your formulation supposed to be far from soaping my dobt is that your raw materials are bad quality.

Ingredients may make soaping in your formulation basically Pq7 and emulsifier but with your level of use for silicone must be too far from soaping.

[Fekher]

I second @Abdullah

[Fekher]

Thanks a lot for sharing.

[Fekher]

For skin feeling absolutely gms se has very superior feeling versus Ceteareth-2 or 3.the same for viscosity and texture. Just I have doubt about stability. I made sample with gms se from 6 months and still stable…