One of the reactants may not be charged at once but slowly.

Semi-Batch Reactors Aim of their invention is to get benefit of any thing by changing the contacting pattern. The residence time for all the elements is same: Must be Sometimes used for liquid phase reactions but best suited for gas phase reactions. Often called piston flow, slug flow, ideal tubular flow or unmixed flow reactors. Plug Flow Reactor: (PFR) These are tubular reactors generally but not necessarily. Best suitable for liquid phase reactions Compositions at outlet and inside reactor are same. Product is continuously drawn out and that’s why known for perfect mixing. Ĭontinuous Reactors Continuous stirred tank reactor (CSTR, MFR, BMFR) An agitator is introduced to disperse the reactants thoroughly into the reaction mixture immediately they enter the reactor. This is an unsteady operation where the composition changes with time but is uniform throughout the reactor at a specific time. The resultant mixture is then discharged. Types of Reactors Batch Reactor (BR, STR) The reactants are initially charged into the vessel and are well mixed and left to react for a certain period of time. Heterogeneous reactors show greater variety of configuration and contacting patterns than homogenous reactors.

A heterogeneous reactor may involve a heterogeneous reaction or a homogeneous reaction. Normally solids if present then are in catalyst form.

Reactor Classification and type selection Homogenous Reactors : Only one phase is involved: gas or liquid When more phases are involved the mixing is very important Heterogeneous Reactors : Two or more phases are involved. How to proceed: 1- The type of reactor and its method of operation 2- The physical condition of reactants at inlet What is desired: 1- Reactor Size: Volume and important dimensions 2-Composition and physical conditions of product 3- Temperature inside the reactor and H.T methodology 4- Operating pressure and any pressure drop occurring at inlet or outlet of reaction mixture The existence of any by product must be known Introduction to Reactor Design Reactor Classification Modes of Operation of Reactors Choice of Operating Conditions: A practical approach Design of an ideal batch Reactor įundamentals Chemical reactor is the heart of the plant Basic aim is to produce a specified product at a given rate from unknown reactants. Chemical/Polymer Reactor Design Muhammad Zafar Iqbal

Reactor agitator design ppt