Historically, there were three generations of evolution in random packings. The first generation (1907 to the 1950s) produced two basic simple shapes, the Raschig ring and the Berl saddle, that became the ancestors of modern random packings. These packings have all been superseded by more modern packing and are seldom used in modern distillation practice.
The second generation (late 1950s to the early 1970s) produced two popular geometries—the Pall® ring, which evolved from the Raschig ring, and the Intalox® saddle, which evolved from the Berl saddle. The second-generation packings are still popular and extensively used in modern distillation practice.
The third generation (the mid 1970s until present) has produced a multitude of popular geometries, most of which evolved from the Pall* ring and Intalox® saddle.
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