Powdered detergents operation

Fig. 6. Washing performance on different soilings of a U.S. liquid detergent (B) and a U.S. powder detergent (H in a Terg-o-tometer operating at 20°C for 10 min one enzyme dosage. EMPA 117 (nulk, blood, and ink on polyester/cotton) EMPA 116 (milk, blood, and ink on 100% cotton) grass on (100% cotton) AS 10 (milk, oil, and pigments on 100% cotton) blood soilings (on 100% cotton).

Detergent powder processing, as mentioned earlier, is composed of a number of basic operations such as spray drying, agglomeration, and finished product making and handling. Each operation is considered in the following in text. 

The spray dried granules are often known as blown powder. The components of blown powder are those of the detergent formulation that are robnst to the operating temperatures within the tower. The core components are as follows ... 

The detergent drying process is a large-scale process, and in modem installations digital control systems are used to control the plant. However, the control of product properties such as density and blown powder moisture tends not to be fully automated, partly due to the multivariable uature of the product properties and lack of robust measurement systems. Therefore, there tends to be a human operator responsible for the starting-up, center lining, and shutting down of the process. 

Hydrous sodium silicate granules can be prepared from the spray-dried powders by compaction operations to enlarge bulk density to about 500-900 g/L (see Table 22.1). This property is essential for many applications, for example, automatic dishwash detergents [65,66]. 

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