# Process Modeling Engineer

**Company:** [Mariana Minerals](https://hotfix.jobs/companies/mariana-minerals)
**Location:** San Francisco, CA, Houston, TX
**Role:** Other
**Salary:** $100k – $160k/yr
**Skills:** aspen plus, hysys, syscad, oli studio, metsim, Python, MATLAB, process modeling, chemical engineering, mass transfer, heat transfer, thermodynamics, data reconciliation, Process Optimization
**Posted:** 2026-07-24

> Develop, validate, and optimize steady-state and dynamic process models for critical minerals refining using tools like ASPEN, SysCAD, and OLI. Translate lab/pilot data into scalable designs, supporting R&D, operations, and techno-economic analysis for next-generation mineral facilities.

## Job Description

## Responsibilities
- Develop steady-state and dynamic process models to establish heat and material balances for integrated mineral refinery systems using ASPEN, SysCAD, OLI, or METSIM.
- Automate equipment and process sizing (reactors, heat exchangers, filters, crystallizers, evaporators, and separators) based on model outputs, linking models to datasheets and other engineering tools.
- Develop and maintain process simulation databases, ensuring consistency and traceability between modeling assumptions, test data, and engineering deliverables.
- Calibrate and reconcile models using pilot or plant operating data to ensure model fidelity and predictive accuracy.
- Conduct process optimization studies — evaluating energy/heat recovery, recycle strategies, and material efficiency improvements.
- Develop dynamic process models to validate PLC and DCS programming and evaluate/optimize buffer sizing throughout the design.
- Link process models to CAPEX and OPEX estimation tools, automating technoeconomic model development.
- Document modeling methodologies and results, providing clear technical communication for design reviews, techno-economic assessments, and regulatory submissions.

## Requirements
- Bachelor's degree or higher in Chemical Engineering, Mechanical Engineering, Process Engineering, Metallurgical Engineering, or a closely related engineering discipline.
- Proficiency in one or more of the following process simulation tools: ASPEN Plus / HYSYS, SysCAD, OLI Studio / OLI Flowsheet, METSIM.
- Deep understanding of mass transfer, heat transfer, thermodynamics, fluid flow, and reaction engineering.
- Experience developing material and energy balances for multi-step, integrated process systems.
- Strong grasp of chemical equilibria and phase behavior in aqueous and non-aqueous systems.
- Familiarity with data reconciliation, parameter fitting, and model validation using experimental or operational data.
- Experience integrating process modeling outputs into EPC deliverables (PFDs, P&IDs, equipment datasheets, control narratives, etc.).

## Nice-to-Haves
- Competency with Python or MATLAB for model automation, data processing, and custom calculations.


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