ADV01-05_1-298

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www.restekcorp.com

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ASTM Method D-6352 is a gas chromatography

(GC) method developed for the determination of

petroleum distillates with a boiling point range of

174°C to 700°C. Often referred to as “high-temper-

ature simulated distillation,” this method requires a

capillary column capable of withstanding GC oven

by Neil Mosesman, GC Columns Product Marketing Manager

Fast, High-Temperature

Sim Dist Analysis

MXT

-1HT Sim Dist Capillary GC

Column and the GC Racer*

✔

Analysis time reduced by 75%, increases throughput.

✔

Meets all criteria of ASTM Method D-6352.

✔

Excellent peak shape for high-boiling compounds.

temperatures up to 430°C. This presents many

challenges for analysts because most capillary

columns are manufactured using polyimide-coated

fused silica tubing. At temperatures above 380°C,

even the best polyimide coating becomes brittle,

which leads to very short column lifetimes. In addi-

tion, the methyl silicone stationary phase recom-

mended in the method also must survive these high

temperatures.

The MXT

-1 HT Sim Dist column is a major

improvement in column technology for high-tem-

perature simulated distillation. By combining a new,

proprietary polymer synthesis technology, Siltek

™

deactivation, and rugged tubing, we developed a

Figure 1

The MXT

-1HT Sim Dist column exhibits

lower bleed and improved peak shape

compared to other columns used for

simulated distillation.

capillary column that meets all the criteria of ASTM

Method D-6352. This MXT

-1HT Sim Dist column is

available as a 5m, 0.53mm ID, 0.1µm film to con-

form to the requirements of this method. It exceeds

the resolution, peak shape, and bleed criteria for

hydrocarbons ranging up to C-110. Because the

MXT

-1HT Sim Dist column is coated with a 100%

dimethyl polysiloxane polymer, it will give the cor-

rect retention time/boiling point curve. The MXT

1HT Sim Dist column exhibits low bleed and excel-

lent inertness, and the rugged tubing will hold up to

temperatures in excess of 430°C.

To demonstrate the lower bleed and improved peak

shape of this innovative column, a Polywax

1000

reference material was analyzed using an MXT

1HT Sim Dist column and two other columns that

are commonly used for this application (Figure 1).

The MXT

-1HT Sim Dist column exhibits lower

bleed and improved peak symmetry compared to

other columns on the market.

As part of cost reduction efforts, many laboratories

try to reduce individual sample analysis times in the

interest of increasing overall throughput. High-tem-

perature simulated distillation analyses can take as

long as an hour, especially when samples contain

hydrocarbons up to C110. An effective technique to

reduce analysis time is to use rapid temperature

programming. Unfortunately, most GC systems have

temperature-programming limitations of 20°C to

25°C/min. To overcome these limitations, Restek

offers the GC Racer, an attachment to your Agilent

GC_PC00542

GC_PC00541

Sample:

0.2µL Polywax

1000 standard

(cat.# 36227);

Solvent:

carbon disulfide;

Injector:

on-column (track oven);

Carier gas:

heli-

um (constant pressure);

Head pressure:

1.0psi;

Linear velocity:

60cm/sec.;

Flow rate:

7.8mL/min.;

Detector:

FID @ 430°C;

Make-up gas flow:

40cc/min.;

Temp. program:

40°C to 430°C @

10°C/min. (hold 30 min.)

Brand Y

Brand X

Figure 2

Significantly reduce simulated distillation analysis time using the MXT

-1HT Sim Dist column

and the GC Racer attachment.

C44

C50

C60

C70

C80

C90

C100

C110

C120

C130

5m, 0.53mm ID, 0.10µm MXT

-1HT Sim Dist (cat.# 70100)

Sample:

Polywax 1000 (cat.# 36227);

Solvent:

carbon disulfide;

Sample size:

0.2µL;

GC:

HP5890 GC w/ GC Racer

™

system;

Injector:

on-column (track oven);

Carrier gas:

hydrogen;

Constant pressure:

1.0psi;

Detector:

FID @ 430°C;

Temp. program:

40°C to 430° C @ 60°C/min.

D6352-98 Polywax

Standards

These high molecular weight hydrocarbon waxes are useful for simulated distillation and other

high-temperature GC work.

Description

qty.

cat.#

Ea.

Polywax 500

1 gram

36224

Polywax 655

1 gram

36225

Polywax 850

1 gram

36226

Polywax 1000

1 gram

36227

50 min.

78pA

85pA

GC_PC00543

GC_PC00530

C30

C110

C30

C110

MXT

-1HT Sim Dist

C30

C110

Wow!

28pA