- Washing Powders (Detergents,
Soaps, Surface Active Agents) :
The free-flowing, non-dusty, non-caking products in bead form are
produced in counter-current flow dryers with nozzle atomization is
the preferred layout for high-bulk-density detergents. Feeds are
homogenized and fine-filtered prior to passing to nozzles operating
at high pressure. Hot air from direct-fired air heaters enters at
the base of the cylindrical part of the tower with slight rotary
motion. The exhaust air is drawn from the top of the tower. Inlet
temperatures vary according to product. Up to 400°C (750°F)
is used for some detergents, but lower temperatures are used for
fine washing agents. Product recovery from the drying tower is high
(99%). The fines fraction is usually returned to feed preparation.
Open - cycle dryers are normally used, Co-current dryers are used
for low - bulk - density detergents.
- Soda Products :
Detergent formulations consist basically of (a) an active
ingredient (b) sodium tripolyphosphate, (c) silicates, (d) sodium
sulphate. Normally the active ingredients are fatty alcohol
sulphates, primary and secondary alkyl sulphonates and alkyl aryl
sulphonates. Synthetic detergents are currently based upon linear
alkyl benzene sulphonates. Formulations are with variations as
decided by each company.
- Heavy - Duty Detergents
Synthetic detergents are widely used in cleaning of all types and
operate successfully with hard water. The coarse powder granules in
bead form are free-flowing, non-dusty and readily dissolve in water.
Shelf-life is excellent, with no tendency to instability or lumping.
The feed can be formulated batchwise or continuously. Comp slurry
preparation systems ensures the right preparation technique which
improves the quality of the final dried detergent powder. Precise
weighing / metering, mixing, homogenizing and de-aeration take place
before spray drying. As high a solid content as possible is used (50
- 65%) to give the optimum powder bulk density and best economic use
of the spray dryer.
The product is dried in a counter-current-flow drying tower at
inlet temperature 350 - 400°C (660 - 750°F). The dried
powder leaves the base of the drying tower and is transported via a
conveyor belt to an air lift. During passage on the belt, product
dosing is carried out. Dosing materials can be products that would
be damaged during spray drying, e.g. lauryl alcohol, enzymes. Bleach
alongwith enzymes is also added at this stage. Perfume is added
after the following air lift.
- Light Duty Detergents
Light - duty detergents are used less than heavy duty. They find
wide application only in dish washing and light household cleaning
(janitoring). Light -duty detergents are produced in nozzle towers
with either co-current or counter-current flow. Choice depends upon
required bulk density. Inlet drying temperatures are also lower, 250
- 275°C (480 - 530°F).
- Detergent Allied
Comp also provides state of art powder technology for detergent
allied products like Sodium Lauryl Sulphate (SLS), Alfa Olefin
Sulphonate (AOS), Optical Brightening Agents (OBA), Linear Alkyl
Benzyl Sulphonate (LABSA), Sodium Silicate, Sodium Tri-polyphosphate