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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%
Application Photos
MCT460   MCT460-WP   MCT460-T   MCT466HD   MCT466SF   MCT466QC   GUARDIAN  
Moisture Transmitter
Tobacco Moisture Transmitter
Wood Products Moisture Transmitter
MCT466 QuikCheck
Rugged NIR Tester
Scanning Frame System
Process Sensors Corp.
113 Cedar Street
Milford, MA 01757 USA
Tel: (508) 473-9901
Fax: (508) 473-0715
Process Sensors Europe
Unit 4, Adelaide House
Corbygate Business Park
Corby, Northants NN17 5JG
United Kingdom
Tel: 01536-408066
Fax: 01536-407813
Process Sensors Polska
Ul. Modlinska 310/312 lokal 216
03-152 Warszawa
Tel: (48) 22 6739526
Fax: (48) 22 6739527
Gsm: (48) 509 202759
Process Sensors Asia
PT 3852 Taman Binaraya 3
Off Jalan Pasir Puteh
Limbat, 16150 Kota Bharu Kelantan, Malaysia
Tel: 00-609-765-1352
Fax: 011 60 6601 4588
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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...

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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...