Tail gas, petroleum, saturate gas plant mixed stream, C4-rich

CAS 68478-32-0

U.S. production volumes are classified as confidential business information.

US productionCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Import value, 2024$658M

Import volumeZero

Top sourceCanada 97%

At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production is reported production, not a complete census of factories. US production volume is confidential. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 271113 · basket

EPA reports by year

2023: US production Confidential · Imports Zero
2019: US production Confidential · Imports Confidential

These shares come from HS customs code 271113, which covers 15 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries

Country of origin for US imports, from Census customs data (2024).

CA 97%CanadaKR 3%South Korea

China
United Kingdom
United Arab Emirates
Philippines
Italy
Turkey
Germany
Sweden
Netherlands
Guyana
Ireland

EPA-registered manufacturers (4)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Chevron

Delek Us Holdings

Marathon Petroleum

Sinclair Casper Refining

Domestic parents -- activity not disclosed (1)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Valero Energy

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Chemical Identity

CAS68478-32-0

PubChem CIDNot recorded

DTXSIDDTXSID5028613

FormulaNot recorded

Mol. WeightNot recorded

SMILESNot recorded

Data Sources

EPA CompTox (DSSTox) · DTXSID5028613Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

Tail gas, petroleum, saturate gas plant mixed stream, C4-rich (CAS 68478-32-0) https://chemicalindependence.com/chemical/68478-32-0/ EPA CompTox (DSSTox): DTXSID5028613. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID5028613 EPA Chemical Data Reporting: 68478-32-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 271113 for CAS 68478-32-0. Reporting year: 2024. https://usatrade.census.gov/