6. Benefits

shelf life are required to be given in the case of pharmaceutical products. Quality indexes such as taste, nutritional properties, texture, etc. are important in the case of food products. Similarly for products from chemical processes, final composition

Synthesis of various chemicals usually is carried out in a reactor which may or may not be followed by separator. Either the case may be choice of design variable is very important. The market value of overhead product or the bottom product relies on its purity. Also the need of any further treatment for enhancing the purity relies on the initial product composition. In view of this, the degree of freedom for the column should be zero; that means the number of variables should be the same or equal to the number of equations involved in modeling. For example for a distillation column, if a designer specifies reflux ratio or boil up ratio and a distillate rate, then there will be corresponding unique set of distillate and bottom composi-

Variability in the product purity is due to various factors including variable flow

rate, reboiler heat duty, reflux rate, and temperature inside the column. These parameters can be controlled using various control techniques to meet final product specification requirement as per the market demand both for large market and

Various control techniques are available which can be suitably applied to get continuous controlled final product composition. Detailed process knowledge helps in control of such a nonlinear process. The control performance also affects plant processing rates and utility usage. Process control engineering helps in designing control loop system which helps in the control of multivariable system and the

A specification is the minimum requirement according to which a producer or

Design and implementation of method of manufacture in actual plant condition permit to make product in the quickest and easiest way of manufacturing. These also require preparing manufacturing instructions, sequence of operations, and

Everything that is required for manufacture must be selected, taking care that all

service provider makes and delivers the product and service to the customer.

5.1.3 Providing the necessary machines, plant, tooling, and other equipment

the elements are capable of achieving the standard of quality demanded.

4. Importance of product purity in chemical engineering

or product purity as quality index is required.

Distillation - Modelling, Simulation and Optimization

tion with respect to a fixed feed flow rate.

small market.

5. Product purity in reactive distillation

systems involved multiple inputs and multiple outputs.

5.1 Steps to achieve quality specifications

5.1.2 Deciding on the method of manufacture

5.1.1 Fixing product specifications

other procedures.

96

Benefits of reactive distillation include:

