BATCH SAPONIFICATION PLANT FOR SEMI BOILED SOAP
Batch saponification is an efficient industrial process for producing semi-boiled soap from vegetable oils and animal fats. Using a Saponification Crutcher, this process provides flexible, controlled production of semi-boiled soap for laundry and other solid soap applications.
Batch Saponification Plant for Semi-Boiled Soap
A Batch Saponification Plant using a Saponification Crutcher is one of the most widely used and economical systems for producing semi-boiled soap on an industrial scale. This type of batch soap saponification plant can be designed for different production capacities. The main advantage of the batch system is its flexibility. Because the saponification reaction takes place batch by batch, the soap manufacturer has the possibility to check and, if necessary, correct the batch at the end of the reaction. The saponification reaction normally takes place at approximately 90°C.
Saponification Crutcher
Filtered vegetable oils or animal fats are pumped into the Saponification Crutcher. The required caustic soda solution is then gradually introduced through a distributor ring installed in the upper part of the Crutcher. The fatty materials and caustic soda solution are dosed using pumps, with a flow meter for each pump. This allows the quantities of the two reactants to be accurately controlled according to the required stoichiometric ratio. During the addition of the caustic soda solution, the mixing screw continuously rotates, providing the agitation required for the saponification reaction.
Crutcher Mixing and Heating
The Saponification Crutcher has a cylindrical body with a conical lower section. Inside the vessel, an enclosed screw stirrer driven by a gear motor provides the vigorous mixing required to obtain a complete and homogeneous reaction. The Crutcher is equipped with a heating jacket or half-pipe steam coils. Steam is used to heat the mixture of oils or fats and caustic soda, accelerating the saponification reaction. The Crutcher normally operates at atmospheric pressure. Advanced models can also be designed to operate under pressure, allowing higher operating temperatures that can accelerate the reaction and help manage viscosity problems.
Semi-Boiled Soap Production
Once the saponification reaction has been completed inside the Crutcher, fillers can be added when required, particularly for the production of laundry soap. The resulting semi-boiled soap is then pumped into a feed tank, which acts as a buffer and provides a continuous supply of soap to the downstream equipment. The semi-boiled soap produced by this type of batch saponification plant typically has a TFM (Total Fatty Matter) of approximately 61% or more, depending by the quantity of water added in the crutcher.
Tandem Saponification Crutchers
For higher production capacities, an alternative configuration is to use two Saponification Crutchers operating in tandem instead of one Crutcher combined with a buffer tank. While the saponification reaction takes place in the first Crutcher, the semi-boiled soap produced in the second Crutcher is pumped out toward the downstream equipment. This tandem arrangement allows the plant to provide a continuous supply of semi-boiled soap to the following processing equipment, even though the saponification itself is carried out in batches.
Knowledge Content – Browse by Topic
01. WHAT IS SOAP
02. RAW MATERIALS USED IN SOAP MANUFACTURING
07. SOAP DRYING AND COOLING
08. SOAP FINISHING LINE
09. SOAP PACKAGING