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Moisture Measurement in the Soap Manufacturing Process  

Moisture content of soap pellets differs depending on the desired characteristics of the soap bar. On-line moisture measurement at the exit of the Spray Dryer/Pelletizer provides immediate feedback on moisture levels enabling more rapid optimization of the process upon start-up, on-going cost savings from more efficient usage of the drier, and consistent high quality product.

Soap Production Process
Soap results from a saponification reaction between fat, oil or fatty acids and inorganic water-soluble bases. The fats are commonly beef or mutton tallow, coconut or palm kernel. After pretreatment of the fats/oils to eliminate impurities and impart color or odor, saponification by continuous or batch process results in liquid soap, also known as neat soap, and the by-product glycerine. The latter is removed and refined, and the liquid soap enters a vacuum spray drier which dries the soap prior to it entering a pelletizer.

The pellets are stored in pellet bins before undergoing their final conversion into bar soap.

Gauge Installation
Moisture measurement is made at the exit of the pelletizer, the 4-20 mA output can be used to control steam pressure in the heat Exchanger which influences the moisture content of the pellets. The gauge is installed at an angle of 20 to the horizontal in order to minimize specular reflection. If the exit chute is enclosed, the product can be viewed through either a viewing window or an insertion probe.

 
 
Measurement Performance
Measurement Location Target % Typical Accuracy%
Moisture Exit of Pelletizer 9-15% 0.25%
 
 
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  Process Sensors Moisture Transmitters

MCT 460: Used in a wide variety of industrial processes, the MCT 460 Multi-Constituent NIR Transmitter, a True Stand-Alone Transmitter, provides off-line accuracy under on-line operating conditions. Read more about the MCT 460 moisture sensors...

MCT 460-T: The MCT 460-T measures moisture... the most critical variable in tobacco processing... providing the world's most accurate, reliable and stable moisture measurement for the tobacco industry. Read more about the MCT 460-T moisture measurement tool...

MCT 460-WP: The MCT 460-WP uses a well proven algorithm which works on a wide range of wood varieties and forms. You choose the mode of operation, stand-alone or networked. Read more about the MCT 460-WP moisture measurement tool...

MCT 330HD: The MCT 330HD features a heavy duty stainless steel enclosure, is resistant to high temperatures, is sealed for wash down environments, and provides reliable, continuous moisture measurement. Read more about the MCT 330HD moisture measurement tool...

MCT 466-SF: The MCT 466-SF features a food grade optical window, a robust stainless steel enclosure, and reliably operates in high temperature locations, measuring moisture, oil & product temperatures. Read more about the MCT 466-SF moisture measurement tool...

MCT 466 QuikCheck: Used for quality control in a wide variety of industrial processes, the MCT 466 QuikCheck bench top NIR Tester provides fast accurate results every time. Read more about the MCT 466 QuikCheck moisture analyzer...

GUARDIAN: The Guardian Scanning Frame System is comprised of three components: MCT-460 NIR Transmitter, the automated Scanning Frame and a PC with Automated Guardian Profile Software. Read more about the GUARDIAN Scanning Frame System...