Packed columns basic design

Packed columns are designed for pressure drops between 0.20 and 0.60 inches of water per foot of packing material. The vertical alignment of a packed distiiiation coiumn is very important because for each degree of inclination, 5% to 10% efficiency is iost. When the coiumn is tiited, dry sections form in the column and liquid channeling occurs. Figures 6-20 and 6-21 iiiustrate the basic components of a packed column. 

FIG. 19-79 Variations in the basic column design a) packed column, (h) Jameson cell, and (c) air-sparged hydrocyclone. 

Two types of contractors will be utilized a perforated-plate column for S i and a packed column for Sj. The basic design and cost data that should be employed in this problem are given by El-Halwagi and Manousiouthakis (Chem. Eng. Sci., 45(9), p. 2831, 1990a). 

Coker, A K., Understand the Basics of Packed-Column Design, Chem. Eng. Prog. Nov. (1991) p. 93. 

The basic design of instrument is schematically illustrated in Fig. 2.143 and consists of a metal or glass column approximately 2-3 m in length and 2-4 mm internal diameter, which is in the form of a circular spiral of three or four turns, and packed with supporting medium impregnated with a stationary phase the column is located in a temperature controlled oven. The mobile gas phase... 

This chapter introduces how continuous distillation columns work and serves as the lead to a series of nine chapters on distillation. The basic calculation procedures for binary distillation are developed in Chapter 4. Multicomponent distillation is introduced in Chapter 5. detailed conputer calculation procedures for these systems are developed in Chapter 6. and sinplified shortcut methods are covered in Chapter 7. More complex distillation operations such as extractive and azeotropic distillation are the subject of Chapter 8. Chapter 9 switches to batch distillation, which is commonly used for smaller systems. Detailed design procedures for both staged and packed columns are discussed in Chapter 10. Finally, Chapter 11 looks at the economics of distillation and methods to save energy (and money) in distillation systems. 

Spray headers are typically used for packed beds in certain process columns. The design of spray headers is not covered in detail in this procedure. However the basic steps are as follows ... 

Stripped of smaller molecules. The stripped vapors are returned to the column and allowed to separate in the tower. Distillation columns come in two basic designs plate and packed. 

Distillation is a process that separates the components in a mixture by boiling point. At the heart of a distillation system is the column. Distillation columns come in two basic designs plate and packed. Flow arrangements vary from process to process. The symbols allow the technician to identify primary and secondary flow paths. The two standard symbols for distillation columns are shown in Figure 7-13. A distillation system is a complex arrangement of equipment and instruments. In most cases, all of the equipment covered in this text could be found in service within a distillation system. 

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