UOP 411-13 PDF

Full title and description

UOP 411-13 — "Normal Paraffins by Subtractive GC": a UOP analytical method that defines a subtractive gas‑chromatography procedure for measuring total normal paraffins (TNP), individual normal paraffins, and total non‑normal paraffins in appropriate process streams.

Abstract

This method specifies a subtractive GC technique used to quantify normal paraffins in desorbent‑free UOP Molex process feed, raffinate, and extract streams, with a stated lower limit of quantitation for an individual normal paraffin of about 0.1 mass‑%. The procedure is intended for refinery and petrochemical laboratory quality and process control.

General information

• Status: Active.
• Publication date: 01 June 2013 (designation UOP 411-13).
• Publisher: Universal Oil Products (UOP) / Honeywell (UOP standards are distributed through ASTM International).
• ICS / categories: 71.080; 71.040.50 (petroleum and analytical chemistry classifications).
• Edition / version: UOP 411-13 (2013 revision).
• Number of pages: 11 pages.

Scope

Applies to the determination of total normal paraffins (TNP), individual normal paraffin components, and total non‑normal paraffins in desorbent‑free Molex process feed, raffinate, and extract streams using a subtractive GC approach. The method defines analytical performance (including a lower quantitation limit near 0.1 mass‑% for individual n‑paraffins) and sample applicability primarily within petrochemical/refining process streams.

Key topics and requirements

• Subtractive gas‑chromatography technique for paraffin analysis.
• Determination of total normal paraffins (TNP) and individual n‑paraffin components.
• Measurement/reporting of total non‑normal paraffins (i.e., branched and other non‑n‑paraffin content).
• Performance limits including lower limit of quantitation for individual n‑paraffins (~0.1 mass‑%).
• Intended sample types: desorbent‑free UOP Molex process feed, raffinate and extract streams.
• Prescriptive sample handling, calibration, and chromatographic subtraction procedures required for reproducible results.

Typical use and users

Used by refinery and petrochemical laboratories, process chemists, and QA/QC personnel for routine and process control analysis of paraffin content in Molex process streams and related hydrocarbon fractions. Typical users include analytical chemists performing GC analysis, laboratory managers preparing method documentation, and engineers interpreting paraffin distributions for process optimization.

Related standards

Part of the UOP family of analytical methods for petroleum and petrochemical streams; related UOP methods cover GC analysis of hydrocarbon impurities, trace‑metal and sulfur methods, and other fuel/refinery analytical procedures (see the active UOP standards listing for nearby method numbers and topics).

Keywords

Normal paraffins; subtractive GC; total normal paraffins (TNP); Molex process; raffinate; extract streams; petrochemical analysis; UOP 411-13; paraffin quantitation.

FAQ

Q: What is this standard?

A: UOP 411-13 is a UOP analytical method titled "Normal Paraffins by Subtractive GC" that prescribes a subtractive gas‑chromatography procedure to quantify normal paraffins in specified process streams.

Q: What does it cover?

A: It covers the analytical procedure, required calibrations, sample applicability (desorbent‑free Molex feed, raffinate, extract), and performance expectations including a lower limit of quantitation for individual n‑paraffins near 0.1 mass‑%.

Q: Who typically uses it?

A: Refinery and petrochemical laboratory personnel — analytical chemists, QA/QC teams, and process engineers — use it for paraffin profiling and process control.

Q: Is it current or superseded?

A: As published it is designated UOP 411-13 (published 01 June 2013) and is listed as an active UOP standard in current catalogs; organizations should check their official UOP/ASTM distribution channel for the latest status or any newer revisions.

Q: Is it part of a series?

A: Yes — it is one method in the broader set of UOP analytical standards for petroleum and petrochemical analysis; related UOP methods address other GC procedures, trace metals, sulfur analyses, and physical property tests.

Q: What are the key keywords?

A: Normal paraffins, subtractive GC, TNP, Molex, raffinate, extract, paraffin quantitation, UOP.