Chemical Engineering in Illinois

📊 Employment Overview

Illinois employs 1,178 chemical engineering professionals, representing approximately 3.8% of the national workforce in this field. Illinois ranks #6 nationally for chemical engineering employment.

💰 Salary Information

Chemical Engineering professionals in Illinois earn competitive salaries across all experience levels, with an average annual salary of $119,000.

Note: Salaries are adjusted for cost of living and local market conditions. Data based on BLS statistics and industry surveys (2024-2025).

🎓 Schools Offering Chemical Engineering

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🚀 Career Insights

Key information for chemical engineering professionals in Illinois.

🏢 Industry Landscape & Top Employers

Illinois is the nation's sixth-largest chemical engineering market — 1,178 employed professionals ranking #6 nationally with a $119,000 average salary, the state's chemical engineering sector is anchored by one of the most diverse and sophisticated industrial concentrations in North America. The Chicago metro's extraordinary infrastructure — the nation's largest inland port, the Midwest's primary rail hub, and the headquarters concentration of global industrial companies — creates chemical engineering employment in specialty chemicals, food and agricultural processing, pharmaceutical manufacturing, and industrial gases that few states can match in breadth and compensation quality.

Major Employers — Specialty Chemicals: INEOS Styrolution (Aurora) — one of the world's largest styrene and polystyrene producers — operates major Illinois manufacturing. Univar Solutions (headquartered in Downers Grove) is North America's largest chemical distributor, employing chemical engineers in application development and supply chain technical services. Stepan Company (Northfield) develops surfactants and specialty chemicals. Calumet Specialty Products and Quaker Chemical maintain Illinois operations. UOP (a Honeywell company, headquartered in Des Plaines) — the world's leading licensor of petroleum refining and petrochemical process technology — employs chemical engineers as process consultants, technology developers, and application engineers who deploy UOP's catalytic processes at refineries and chemical plants worldwide. A UOP career creates unmatched exposure to global petroleum process engineering across hundreds of client facilities.

Major Employers — Food and Agricultural Chemistry: ADM (Archer Daniels Midland, headquartered in Chicago) is the world's largest agricultural processor — employing chemical engineers in corn wet milling, soybean processing, ethanol production, and specialty food ingredient chemistry at Illinois facilities and supporting its global manufacturing network from Chicago. Corn Products International (Ingredion, Westchester) produces corn-derived food ingredients and employs ChEs in starch modification chemistry. Quaker Oats (PepsiCo, Chicago) and Kraft Heinz (Chicago headquarters) employ food process engineers. The Illinois Corn Belt's agricultural processing infrastructure creates some of the largest-scale food chemical process engineering in the world.

Major Employers — Pharmaceutical and Industrial Gases: AbbVie (North Chicago) — the largest pharmaceutical company headquartered in Illinois, maker of Humira (the world's best-selling drug) — employs chemical engineers in biologics manufacturing process development, API chemical synthesis, and drug substance manufacturing at its North Chicago campus. Takeda Pharmaceuticals (Deerfield), Baxter International (Deerfield), and Hospira/Pfizer's Lake Forest operations add pharmaceutical manufacturing engineering depth. Air Products, Linde, and Airgas have significant Illinois industrial gas distribution and application engineering operations serving the Chicago metro's enormous industrial base.

Key Industry Clusters: The Chicago metro's southwest and northwest industrial corridors — the I-55 southwest industrial belt (Joliet, Channahon, Romeoville) and the I-290/I-88 northwest tech corridor (Schaumburg, Des Plaines, Elk Grove Village) — concentrate chemical manufacturing and process engineering employers at remarkable density. The Illinois River valley's corn processing corridor (Peoria, Decatur, Pekin) is among the world's most productive agricultural chemical process regions. Waukegan and the North Shore pharmaceutical corridor (Abbott/AbbVie country) anchors the state's biopharmaceutical ChE employment.

📈 Career Growth & Pathways

Illinois chemical engineering careers benefit from the Chicago metro's extraordinary employer density — engineers can advance through Midwestern-cost-of-living careers at companies whose technical sophistication equals or exceeds coastal peer employers. UOP's global process technology consulting career track and AbbVie's biologics manufacturing programs represent the pinnacle of their respective specializations anywhere in the world.

• Entry-Level Engineer (0–2 years): $76,000–$95,000 — AbbVie's structured process development programs, ADM's agricultural processing engineering rotational programs, and UOP's process technology entry programs are the most competitive. University of Illinois Urbana-Champaign (consistently top-5 nationally in ChE), Northwestern, Illinois Tech, and the University of Illinois Chicago produce the primary talent pipeline.
• Mid-Level Engineer (3–7 years): $102,000–$130,000 — AbbVie process development engineer owning a Humira manufacturing process improvement program, ADM corn wet milling process optimization specialist, UOP process consultant deploying FCC or hydrocracking technology at a new Middle East refinery, or specialty chemicals process engineer at Stepan or INEOS with product line ownership.
• Senior Engineer (8–14 years): $132,000–$167,000 — AbbVie principal scientist with global biologics manufacturing standardization responsibility, UOP senior process consultant with multiple refinery technology licensing credits, ADM global process technology director, or specialty chemicals R&D director at a Chicago North Shore employer.
• Director / Fellow (15+ years): $170,000–$290,000+ — AbbVie Distinguished Scientist or Director of Manufacturing Sciences, UOP Technology Director with global petroleum processing technology intellectual property responsibility, ADM VP of Process Innovation. Illinois's pharmaceutical and specialty chemicals concentration creates senior ChE compensation competitive with any US market outside of California.

UOP's Extraordinary Career Track: UOP (Honeywell UOP) is one of the most unusual employers in chemical engineering — a company whose business model is licensing the process technology (the Platforming catalytic reforming process, the Unicracking hydrocracking process, the Oleflex propylene production process) that runs inside refineries and chemical plants globally. Chemical engineers at UOP become world experts in their assigned process families, consulting with refinery and chemical plant clients in 50+ countries, troubleshooting process performance issues, and developing the next generation of catalyst and process innovations. A UOP career creates technical credibility in petroleum process chemistry that is recognized everywhere refineries operate.

💰 Salary vs. Cost of Living

Illinois's $119,000 average chemical engineering salary is well above the national median — reflecting pharmaceutical industry premium compensation from AbbVie and the Chicago metro's generally elevated wage structure — paired with costs that while above national average are substantially below coastal markets, creating strong net financial outcomes for mid-to-senior career engineers.

Chicago North Shore (Waukegan / North Chicago / Gurnee): AbbVie's pharmaceutical premium dominates this submarket. Senior AbbVie engineers earn $140,000–$210,000+ in total compensation. Housing in Lake County communities (Libertyville, Mundelein, Vernon Hills) runs $380,000–$580,000 median — elevated by Chicago's metro premium but well below comparable pharmaceutical corridor markets near Princeton, NJ or San Diego. A senior AbbVie ChE earning $165,000 in Lake County achieves a lifestyle broadly equivalent to $225,000–$240,000 in New Jersey's pharmaceutical corridor.

Chicago Southwest Corridor (Joliet / Romeoville / Channahon): Industrial chemical manufacturing employers pay $95,000–$145,000 against housing costs 10–15% below the Chicago metro core. INEOS Styrolution and the southwest industrial corridor's specialty chemical manufacturers offer competitive compensation with more affordable residential options than the North Shore pharmaceutical submarket.

Central Illinois (Decatur / Peoria): ADM's Decatur headquarters and Peoria's Caterpillar-adjacent manufacturing corridor offer $85,000–$130,000 for experienced ChEs against a cost of living 15–20% below the national average. Median home prices of $160,000–$250,000 in Decatur and $200,000–$310,000 in Peoria create exceptional homeownership value for engineers in the agricultural processing sector.

State Income Tax: Illinois's 4.95% flat income tax is moderate and predictable — a financial consideration but not a major deterrent for engineers at Illinois's high salary levels.

📜 Licensing & Professional Development

Engineering licensure in Illinois is administered by the Illinois Department of Financial and Professional Regulation (IDFPR). Illinois has a well-organized licensing process and full NCEES reciprocity.

Illinois PE Licensure Path: Standard NCEES FE → 4 years experience → PE exam. The University of Illinois's ChE program produces graduates extremely well-prepared for the PE exam. Illinois PEs practicing in the Chicago-Milwaukee corridor often maintain Wisconsin and Indiana licenses for multi-state consulting.

AbbVie / Pharmaceutical Manufacturing: FDA cGMP expertise (21 CFR Parts 210/211, ICH Q10), biologics manufacturing regulation (21 CFR Part 601, ICH Q5 series), and the EMA's GMP Annex 1 (critical for AbbVie's global manufacturing standardization) are the most career-critical professional development areas for Illinois's dominant pharmaceutical ChE sector. ISPE membership and the Pharmaceutical Engineering journal's technical content are valued professional resources.

ADM / Agricultural Processing: AIChE's Food, Pharmaceutical and Bioengineering Division, the Corn Refiners Association's technical programs, and the Renewable Fuels Association's technical resources are relevant professional development frameworks for Illinois's agricultural chemicals ChE community. Process safety management for combustible dust (relevant to grain processing facilities, which represent a significant explosion hazard category) and OSHA's PSM standard application to corn milling chemical use are important process safety credential areas.

UOP Process Technology: For UOP engineers, membership in AIChE's Fuels and Petrochemicals Division, the National Petroleum Refiners Association (NPRA) technical programs, and the American Chemical Society's Division of Energy and Fuels provide the professional development frameworks most relevant to petroleum processing technology consulting. Presentations at AIChE's Annual Meeting and NPRA's annual conference are recognized professional development milestones for UOP technology engineers.

📊 Job Market Outlook

Illinois's chemical engineering market is positioned for sustained growth, anchored by AbbVie's ongoing biologics pipeline, the Midwest's agricultural processing sector's global demand tailwinds, and Illinois's growing position as a destination for specialty chemicals and pharmaceutical manufacturing investment.

AbbVie's Post-Humira Pipeline: As Humira's patent expiration creates biosimilar competition, AbbVie is investing aggressively in its next-generation immunology drugs (Skyrizi, Rinvoq) and oncology pipeline. These programs require sustained manufacturing process development and commercial manufacturing scale-up engineering investment at AbbVie's North Chicago campus — creating chemical engineering positions in process development, manufacturing science, and quality systems that will replace and exceed the Humira era's requirements.

Renewable Fuels and Green Chemistry: ADM's carbon capture and storage programs (ADM has been operating CO₂ capture at its Decatur ethanol facilities for over a decade, with sequestration in the Illinois Basin), Archer Daniels Midland's sustainable aviation fuel development, and Illinois's overall agricultural processing sector's decarbonization programs are creating new chemical engineering positions in green chemistry, carbon management, and sustainable process development.

5-Year Projection: Illinois chemical engineering employment is projected to grow 9–13% over five years. AbbVie's pipeline expansion and ADM's sustainable processing investments will drive most growth. Total employment could approach 1,330–1,330 by 2029.

🕐 Day in the Life

Chemical engineering in Illinois spans from the gleaming pharmaceutical manufacturing suites of AbbVie's North Chicago campus to the industrial scale of ADM's world-scale corn processing to the global client engagement of UOP's petroleum process consulting — all embedded in one of America's most culturally and gastronomically rich metros.

At AbbVie (North Chicago): A manufacturing process development engineer's day at AbbVie reflects the pharmaceutical industry's rigorous quality culture applied to world-scale biologic drug manufacturing. A morning might involve a batch record review for a Humira production lot — checking that the upstream cell culture bioreactor's critical process parameters (temperature, pH, dissolved oxygen, agitation) remained within their validated ranges throughout the batch, reviewing the cell viability trend that shows a slight decline relative to historical data and determining whether this constitutes an OOS (out of specification) result requiring investigation. Mid-morning involves a process characterization experiment — running a small-scale bioreactor model of the purification capture step to characterize the impact of feed stream pH variation on protein A column binding capacity. Afternoon is spent in a tech transfer meeting — AbbVie is establishing a second manufacturing site for a pipeline biologic and the North Chicago process development team is preparing the process description documents that will guide the new site's equipment qualification and process validation.

Lifestyle: Chicago's quality of life for chemical engineers is one of America's most compelling urban propositions — world-class architecture (the Chicago Architecture Foundation's tours are internationally recognized), Michelin-starred restaurants at prices that New York and San Francisco cannot match, the lakefront's 18 miles of public beaches and parks, and the extraordinary cultural institutions (Art Institute, Field Museum, Museum of Science and Industry) create urban richness comparable to any American city. The Midwest's authentic community culture — less transactional than coastal metros, more deeply rooted in neighborhood identity — creates a professional and social environment that many engineers who come for career reasons discover they want to make permanent.

🔄 Compare with Other States

See how Illinois compares to other top states for chemical engineering: