Page 44 - Plant design and economics for chemical engineers

PROCESS DESIGN DEVELOPMENT 27

Basis : One operoting doy
Production of 15~ lo6 Ib/yr BBS withaplont operation
of 300 calendar doys per yeor
Row moteriols Processing Products

AICI,
Alkylotor sludge
1,756 lb
24,016 lb
-
AIC13 t
1.756 lb Froctionotors Heavy ends
3,516 lb

20%
Oleum * Sulfonotor
43,951 lb
1(75,596 lb)
Water * S e p o r o t o r
0,579 lb
1t47.314 lb)

FIGURE 2-4
Quantitative flow diagram for the manufacture of sodium dodecylbenzene sulfonate.

around each piece of equipment. Temperature and pressure levels at various
key points in the process, particularly at the reactors, serve as guides in making
these heat balances. The complete calculations for the material and energy
balances for each piece of equipment, because of their length, are not presented
in this discussion.

Equipment Design and Selection

Equipment design for this preliminary process evaluation involves determining
the size of the equipment in terms of the volume, flow per unit time, or surface
area. Some of the calculations associated with the alkylation unit are presented
in the following to indicate the extent of the calculations yhich are sometimes .
adequate for a preliminary design.