The neutralisation
of sulphonic acid is made continuously by means of a metering
pump which feeds the right quantities of sulphonic acid (and/or
fatty acid) and sodium hydroxide solution.
All liquid,
solid raw and recovered materials are collected and rapidly stirred
in the slurry preparer which is designed for breaking any possible
agglomerate and for obtaining an homogenised slurry.
Gas and possibly
dragged powders developed in slurry preparer are cleaned by process
water. That water is then recycled to slurry preparer itself.
The solid raw
materials from the day vessels and the "paste" from
the neutralisation unit are automatically dosed into the slurry
preparator. These components are blended and mixed to form a
homogeneous thick liquid called "slurry".
The slurry is then discharged into an aging vessel and filtered.
The slurry preparation
is carried out either continuously or batch-wise controlled by
a PLC/Computer system.
