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about use NaOH to Neutralizing LAS (Linear Alkylbenzene Sulfonate)
As we know, NaOH is a basic, LAS is a acid, and has reaction when mix they. The question here is: What is the role of NaOH in this formula? In addition to neutralizing las acid? If there is another role, how does it keep that role when it is neutral with acid? Of course, I understand that detergent such as laundry detergent or dishwashing is usually basic (> 7), that is, NaOH is having an extra out of the solution to show its role.
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5 Replies
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NaOH is mainly used to neutralize LABS in dishwashers. Now, as an added benefit, it can neutralize fats to make them easier to remove.
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thank, but the question in this case returned from #1 post: how NaOH can neutralize fats if neutralized with acid? or NaOH will reaction both fats and acid same time?
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When talking about fats, you have fatty acids in there, so they add up to the mixture of acids that can be neutralized (some triglycerides can also be hydrolyzed to give fatty acids). NaOH will neutralize the stronger acids first. If you measure your pH and it’s fairly basic, you can assume most of your acids have been neutralized. In the case of LABS, I would aim for a pH coser to 9, to prevent drifting.
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thank your answer! maybe i missing it
btw, so about product of NaOH + Las reaction, is it any role in washing? or just product of acid-basic reaction, for neutralization las acid, and nothing else?
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what is the reason of color shading in detergent powder
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