During start-up of the chemical processes, it is preferable to reach standard operating condition in minimum time to increase the time for normal production. In batch processes, frequent set-point changes are needed in reactor temperature to follow optimum temperature trajectory. Both above situations require the controlled variable to reach the new set-point in minimum time with almost no or very little overshoot. In this paper, a simple switching controller design is proposed for chemical processes which can be approximated as first-order or second-order model with deadtime. Maximum and/or minimum manipulated variable changes in association with PID controller will be properly utilized to reach the new set-point in minimum time and with no overshoot. The switching point in the controller design is based on the current measurement of the controlled variable or the error signal and the derivative of the error signal which are readily available. The usage of this switching controller design can be extended to highly nonlinear processes under set-point changes. Several numerical examples will be used to illustrate the usefulness of the proposed design.