What are the roles and responsibilities for Chemical Engineer?

•  Chemical engineers design new or develop chemical processes for large-scale manufacturing.
• Plan and test production methods and provide support for chemical operations and equipment.
• Monitor and analyze data from processes and experiments. 
• Develop safety procedures.
• Troubleshoot problems with chemical manufacturing processes.
• Evaluate chemical equipment and processes to identify ways to optimize performance or to ensure compliance with safety and environmental regulations.
• Conduct research to develop new and improved chemical manufacturing processes.
• Prepare estimate of production costs and production progress reports for management.
• Monitor the process and control over variables such as temperature, density, specific gravity, and pressure. 

Petroleum engineer roles and responsibilities

• Design equipment to extract oil and gas in the most profitable way
• Develop plans to drill in oil and gas fields, and then to recover the oil and gas
• Make sure that oil field equipment is installed, operated, and maintained properly.
• Develop safety procedures.