Zero Waste Logo The Zero Wate Network the University of Texas at Arlington Center for Environmental Excellence Environmental Training Institute Logo  

Join Us on:

Social Network Nav Bar

Lean and P2 Workshops

June 8, 2018

Little Rock
July 31, 2018




Case Study Database

           Add Story    |    Search Case Studies    |   


Chevron Chemical Company

Year Submitted: 2003

Process: Reactor Cleaning

Industry: Petroleum Refining

Wastes Reduced: Hazardous Waste

Substance: Xylene

Location: Baytown TX

No. of employees: 962

Contact: Todd Williams

Phone: (713) 421-6386


Prior to July of 1994 Chevron disposed of spent xylene by incineration or hazardous waste fuel blending. The facility's alpha olefin production process produces C4 to C30 alpha olefins, the higher molecular weight materials are wax. Periodically the reactors are cleaned with mixed xylene solvent to remove build up of polymer and wax from reactor piping.

P2 Application:

It was realized that the spent xylene/polymer mixture could be used as an alternative feedstock to produce pyrolysis gasoline at the on-site ethylene unit. Initially the spent solvent was trucked to the other facility. Direct lines and storage facilities were built to transfer the spent xylene and reduce the potential for spills.

Environmental Benefits:

Approximately 500 tons of spent xylene a year no longer has to be shipped off-site for incineration or fuel blending. All the material is being reprocessed into pyrolysis gasoline. Not only is hazardous waste reduced, but the potential for spills and exposure of workers is greatly reduced.

Details of Reductions

Additional Information :

The costs savings resulting from no longer needing to dispose of spent xylene is $68,000 a year. The project will payout in 2.9 years based on waste disposal savings plus increased revenue of $60,000 a year from incremental pyrolysis gasoline production.

Source: TCEQ

SHEP Shield
Health and

ERP Shield

ESP Shield

EMP Shield

Attend a workshop and
earn credits toward a
Professional Certification



The Zero Waste Network is one of eight Pollution Prevention Resource Exchange P2RxCenters , serving as a national network of regional information centers: NEWMOA (Northeast), WRRC (Southeast), GLRPPR (Great Lakes), ZeroWasteNet (Southwest), P2RIC (Plains), Peaks to Prairies (Mountain), WSPPN (Pacific Southwest), PPRC (Northwest). We are a proud member of the National Pollution Prevention Roundtable.

National P2 Roundtable Logo