DB-HT SimDis

DB-HT SimDis Column

Application-Specific GC Columns

Agilent J&W DB-HT SimDis GC columns are engineered specifically for high-temperature simulated distillation (HT-SimDist) applications, including ASTM D7169, D6352, and D5307. These columns are designed to deliver precise boiling point distributions for heavy petroleum fractions such as heavy gas oils, lubricating base oils, vacuum gas oils, and crude oil residues—materials that require extended upper temperature limits and exceptional thermal stability.

DB-HT SimDis columns feature bonded, crosslinked stationary phases supported by a high-temperature polyimide-coated fused silica tubing, allowing operation at temperatures up to 430–450 Â°C. This enables the analysis of high-boiling, late-eluting hydrocarbons with excellent peak shapes, minimal carryover, and stable retention characteristics even after repeated thermal cycling. The rugged construction resists phase breakdown, providing low bleed and long column lifetime under demanding refinery environments.

These columns are optimized for rapid temperature programming, fast bake-outs, and high-throughput simulated distillation workflows. Their superior inertness and retention index stability support accurate, reproducible boiling range distribution curves essential for production optimization, quality assurance, and compliance with globally recognized methods for heavy petroleum characterization.

Extensively tested to stringent refinery-grade QC standards, DB-HT SimDis columns provide reliable performance across multiple analytical platforms and are the preferred choice for laboratories requiring consistent, regulatory-aligned results for heavy hydrocarbon distillation profiling.

Key Definitions â–¸
High-Temperature Simulated Distillation (HT-SimDist)
An extended-range GC technique used to determine the boiling range distribution of heavy petroleum fractions, including vacuum gas oils, lubricating base oils, and crude residues. DB-HT SimDis columns withstand extreme temperatures required for accurate high-boiling hydrocarbon profiling.
ASTM D7169
A widely used high-temperature simulated distillation method for determining boiling point distributions in heavy petroleum fractions up to 720 Â°C. DB-HT SimDis columns are designed and QC-tested to meet the method’s rigorous separation and repeatability requirements.
High-Temperature Polyimide-Coated Fused Silica
A specialized tubing construction that enables column operation at temperatures exceeding 430 Â°C. This high-temperature coating ensures mechanical durability and prevents phase degradation during aggressive temperature programming.
Retention Index Stability
The ability of a GC column to maintain consistent retention times across repeated runs and high-temperature cycles. DB-HT SimDis columns provide exceptional retention index stability necessary for reliable boiling point distribution calculations.
Bonded and Crosslinked Phase
A chemically reinforced stationary phase that is permanently attached to the inner column surface. Crosslinking improves thermal stability, allows solvent rinsing, and minimizes bleed—critical for high-temperature simulated distillation where long bake-outs are routine.
Frequently Asked Questions â–¸
What applications are DB-HT SimDis columns designed for?
DB-HT SimDis columns are engineered for high-temperature simulated distillation methods such as ASTM D7169, D6352, and D5307. They are ideal for determining boiling distributions of heavy petroleum fractions including vacuum gas oils, lube base stocks, and crude oil residues up to 720 Â°C.
How does DB-HT SimDis differ from DB-2887?
DB-2887 is intended for mid-distillate boiling range analysis under ASTM D2887, covering lighter hydrocarbons. DB-HT SimDis, however, supports significantly higher temperatures and is designed to characterize heavy fractions such as vacuum gas oils and crude residues using extended-range HT-SimDist methods like ASTM D7169.
What is the operating temperature range of DB-HT SimDis columns?
DB-HT SimDis columns are designed to operate from approximately –60 Â°C up to 430–450 Â°C, enabled by a specialized high-temperature polyimide-coated fused silica tubing. This allows accurate elution of high-boiling analytes in extended distillation simulations.
Are DB-HT SimDis columns durable enough for repeated high-temperature cycles?
Yes. These columns are manufactured with bonded and crosslinked stationary phases and feature high-temperature-resistant polyimide coatings. They maintain excellent inertness, mechanical stability, and low bleed even after continuous use at extreme temperatures with rapid temperature programming.
What QC testing is performed on DB-HT SimDis columns?
Each DB-HT SimDis column is subjected to stringent refinery-grade QC testing to verify retention index stability, peak symmetry, inertness, column bleed performance, and compliance with high-temperature SimDist method criteria. This ensures analyzer-grade reproducibility for regulated and high-precision workflows.