Residues, petroleum, alkylation splitter, C4-rich

CAS 68513-66-6

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$725M

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, 271119 · basket

EPA reports by year

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

These shares come from HS customs code 271113, 271119, which covers 47 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

Italy
China
United Kingdom
United Arab Emirates
Taiwan
Philippines
Netherlands
Germany
Turkey
Sweden
Trinidad and Tobago
Guyana
Ireland
Qatar
Switzerland

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.

ExxonMobil

Par Pacific Holdings

Phillips 66

Wrb 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.

Pbf Holding

Why It Matters

Sectors

Energy

Downstream UsesNot recorded

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Industrial Uses

•Intermediate in Petroleum Refineries (100%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS68513-66-6

PubChem CIDNot recorded

DTXSIDDTXSID3028639

FormulaNot recorded

Mol. WeightNot recorded

SMILESNot recorded

Data Sources

EPA CompTox (DSSTox) · DTXSID3028639Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
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

Residues, petroleum, alkylation splitter, C4-rich (CAS 68513-66-6) https://chemicalindependence.com/chemical/68513-66-6/ EPA CompTox (DSSTox): DTXSID3028639. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID3028639 EPA Chemical Data Reporting: 68513-66-6. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 68513-66-6. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 271113,271119 for CAS 68513-66-6. Reporting year: 2024. https://usatrade.census.gov/