Petrochemicals PFD Creation

I need a moderately detailed process flow diagram (PFD) for a petrochemical process. The diagram should accurately represent the sequence of operations and the relationships between various process units.

Key Requirements:
- Moderate detail, not too basic or overly complex
- Correct representation of a specific, yet unspecified, petrochemical process
- High standards of accuracy and clarity

Ideal Skills & Experience:
- Background in chemical engineering or a related field
- Experience in designing process flow diagrams, specifically for petrochemical processes
- Proficiency in using PFD software tools
- Attention to detail and accuracy

Please provide samples of similar work done.