Abstract:
Stem palm is one of the solid waste from palm oil industry. It contains high level
of lignin because of lignin we can process stem palm becomes sodium iignosulphonates
(SLS) which will be used as water reducing agent to improve concrete quality.
Lignosulphonates is made by lignin isolation through pulping sulphite. Natrium sulphite
solution and powder o f stem palm are entered into reactor for I hour until the temperature
reaches 160"C and then maintains it for 3 hours. After pulping sulphite process finish, the
next step is filtration, then adds ethyl acetate into black liquor which has been filtered and
then mixs it measure the pH solution i f pH is more than 5 so do the titration with HCl till
the pH under 5.
Furthermore, drying it at lOO't then do titration with NaOH and dry it again at
100"C. This process will produce lignosulphonate which is mixed into concrete mixture
the result of research is the optimum condition lies at 1.4 N concentration and the ratio of
solid lignin is about ) :5. Lignosulphonate is used water reducing agent, means by
addition lignosulphonate so the need o f water in concrete mixture can be reduced.
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