API PETROLEUM PROCESS

Abstract

This document lists the entries for petroleum process streams and related chemical substances which are included in the Toxic Substances Control Act Chemical Substances Inventory (EPA, May, 1979) or in Cumulative Supplement II (EPA, May, 1982, TS-799). It does not include any items which may be listed only in the confidential section of the Inventory by premanufacture notification (PMN). <br>The document consists of two sections. Section I includes the normally liquid or solid process streams or products which are considered chemical substances under TSCA. With few exceptions, these are complex reaction products from the UVCB Index (Chemical Substances of Unknown or Variable Composition, Complex Reaction Products, and Biological Materials). The section includes a list of entries identified as "hydrocarbons" (such as "Hydrocarbons, C8-C11") or by hydrocarbon type (as "Alkanes, C4-C12", or "Aromatic Hydrocarbons, C6-C12"). However, no attempt has been made to list individual hydrocarbons (Class I substances) larger than the pentanes (C5). The presence of specific individual hydrocarbons on the inventory should be checked by direct reference to the full Inventory. <br>Section II includes the normally gaseous process streams (C4 and lighter) which were reported for the Inventory and thus appear in the published volumes. These are listed separately because gas streams may be considered "mixtures" rather than "chemical substances." Analytical capabilities allow determination of the complete composition of refinery gas streams containing hydrocarbons C5 and lighter plus incidental gases such as hydrogen sulfide, carbonyl sulfide, ammonia, carbon monoxide, carbon dioxide, and hydrogen The status of gas streams with respect to TSCA, therefore, can be determined by identification of the individual components present. This approach was adopted in the joint API/EPA preparation of Addendum I to the Candidate List of Chemical Substances (January, 1978). Nevertheless, numerous gas streams were reported for the Inventory. Therefore, they are included in the present document for the sake of completeness. For reference, this section also includes lists of individual light hydrocarbons and related gases which appear on the inventory as individual Class I substances.