Preparation of “Ultrafine” white carbon

Scientifically, the term ultrafine powder or ultrafine particles is used to describe solid products in which the particle sizes are no greater than 100 nm. The ultrafine white carbon black to be discussed in this chapter is the product of particles of a smaller size than those in common products, i.e., ultrafine here is not a scientific but a commercial term. The ultrafine powders in the scientific sense, e.g., nano copper, nano TiO and nano hydroxyapatite, and related topics will be discussed in later chapters. Nevertheless, the principles involved in the preparation of ultrafine white carbon black by impinging stream reaction-precipitation are very similar to those involved in the preparation of the nano powders mentioned above. Therefore this topic is discussed here under the overall title Preparation of ultrafine powders . 

Chen [16] studied experimentally the preparation of ultrafine white carbon black by the common (one-step) precipitation process with the submerged circulative impinging stream reactor (SCISR) developed by Wu [15] as the reaction-precipitation equipment and obtained satisfactory results. 

In the investigation on preparation of ultrafine white carbon black the submerged circulative impinging stream reactor (SCISR) is used as the reaction- precipitation equipment, the structure of which is the same as that shown in Fig. 10.2 it also has the same effective volume of 3.6x10 m but the top cover is not used for convenience because the process is carried out at room temperature and under atmospheric pressure. 

Chen. Yu (1999). Preparation of ultrafine white carbon black by impinging stream reaction-precipitation. ME thesis, Zhejiang University of Technology, Hangzhou, China (in Chinese). 

PREPARATION OF ULTRAFINE POWDERS BY REACTION-PRECIPITATION IN IMPINGING STREAMS I ULTRAFINE WHITE CARBON BLACK... 

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