After completion of chemical engineering , one can pursue career in the following fields :-

Research:
Research engineers work with chemists to develop new ideas and new products. They may come up with a new material or a better way to produce existing products. The mass production of antibiotics, for example, was made possible by chemical engineers in research.
Design:
Design engineers create the process that converts a raw material into a final product. Chemists invented the many synthetic fibers we use today, but chemical engineers designed the plants that produce them at an affordable cost.
Development:

Chemical engineers look for ways to improve new or existing processes. The 'greening' of much of the Third World is due to a big reduction in the cost of ammonia production, which made it possible for poorer nations to manufacture this important fertilizer.
Production:
The manufacture of chemicals requires continuous supervision. Production engineers are always answering questions such as if the product is of the specified purity; if the production rate is what it should be; if control instruments are performing properly and if the process is as safe as possible.
Technical Sales:
Why isn't our product doing what it is supposed to for our customers? Could our new product be used more economically than current materials? Why did that new paint peel from one house? Sales engineers answer such questions. People skills, as well as technical ability, are very important for these chemical engineers.
Management:
Many chemical engineers are promoted to management positions. While less involved in technology, they make policy and business decisions, train new engineers, and solve human, rather than technical problems. This list is neither complete nor comprehensive. For instance, some chemical engineers work in hospitals to find the best method of administering a particular drug to a patient. There is no limit to the kinds of challenging work chemicals engineers do.
Teaching:
Chemical engineers can also work as technical writers, teachers and professors, in fields related to the process industries.