3.1. Principal Chemical Process Engineer-Separation

country: US all locations: [Burlington, MA] commitment: Full Time department: Phoenix Tailings location: Burlington, MA team: 3. Critical Metals Separation Key Responsibilities:: Lead the development and optimization of solvent extraction circuits for rare earth element separation from both primary and secondary sources  Design and execute bench- and pilot-scale experiments to evaluate separation efficiency, reagent performance, and system dynamics  Translate laboratory-scale successes into scalable, industrial processes with a focus on safety, sustainability, and cost-effectiveness  Own and evolve process flow diagrams (PFDs), mass balances, and P&IDs for solvent extraction systems  Drive selection and specification of extractants, diluents, and equipment (e.g., mixer-settlers, columns, or centrifugal contactors)  Analyze separation performance data to identify improvement opportunities and implement process changes  Collaborate closely with metallurgy, chemical engineering, and operations teams to support plant commissioning and troubleshooting  Author technical reports, scale-up plans, and design documentation to support commercialization of Phoenix Tailings’ extraction technologies  Stay at the forefront of solvent extraction technologies and rare earth processing trends to inform and elevate process strategy  Qualifications:: Ph.D. or M.S. in Chemical Engineering, Metallurgical Engineering, or related discipline with 8+ years of relevant experience   Proven expertise in rare earth element/critical metals separation via solvent extraction, including reagent chemistry, process configuration, and optimization  Hands-on experience with lab-scale and pilot-scale solvent extraction systems, including safety and operational best practices  Deep understanding of phase equilibria, thermodynamics, and kinetics relevant to solvent extraction  Demonstrated success in scaling up chemical separation processes from bench to pilot to commercial scale  Proficiency with process modeling tools (e.g., Aspen, METSIM, or similar)  Excellent problem-solving skills with a passion for experimental validation and continuous improvement  Strong written and verbal communication skills, especially in cross-disciplinary environments  We offer a competitive compensation package that is based on expertise. We also offer the following benefits:: This pay range reflects best estimate for the total cash compensation which includes salary + discretionary bonus for this role. Total package may vary based on experience and qualifications. Pay Range: $150,000- $180,000 total cash compensation plus equity Healthcare: 100% Medical, dental, and vision coverage for employee Stock Options: Ownership in a fast-growing venture-backed company.  Time Off: Unlimited PTO.  Learning: Learning and development opportunities to grow your skills and career.