Chemical Engineers play a wide a variety of roles in petrochemical refineries and oil refineries. These include troubleshooting and optimizing (also known as “de-bottlenecking”) plant processes, project management, in-plant process design, and documentation of operations and projects within the refinery. Duties may also include ensuring compliance of plant standards and working with inside and outside organizations to improve reliability and performance of refinery equipment. Chemical Engineers must have experience in all aspects of the refining process, such as distillation, cracking, alkylation, batch and continuous reactions, and extraction. Chemical engineers use their knowledge to make plants run cleaner and faster through new technologies related to petrochemical refining, thus ensuring compliance with environmental regulations, increasing operating efficiency, and adding value through added or improved product.