What is the difference between LABSA and LAS

nikolatesla23nikolatesla23 Member
edited June 2020 in Formulating
Hi Everyone! May I know what is the difference between Linear Alkyl Benzene Sulfonic Acid (LABSA) and Linear Alkyl Benzene Sulfonate (LAS)

I bought 5 kilograms of LAS recently, and it has a very dark brown color to it.

Is it the same with LABSA or not?

Thank you in advance


  • chemicalmattchemicalmatt Member, Professional Chemist
    LAS is the (sodium) salt of LABSA. This ionization makes it more water soluble. The color is related to the activity level and processing grade. Dilute it and see what happens. IF you are using it in laundry, dishwash, HI&I cleaners, etc. does the final color really matter? Likely not.
  • Thank you @chemicalmatt. I recently had a chat with my supplier. They said that it is acidic. This made me think that they screwed-up in labeling their products. 
    Soon after, I tested it by adding a solution of NaOH . It became light brownish (nearly white) color. Also, the solution heated up a little. So I think that the LAS that they've sold to me was not LAS at all rather LABSA. 

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