Page 178 - Praxair - Specialty Gases and Equipment Reference Guide

Hydrocarbon Processing

Refining

A Complete Product Line
Whether for lab analysis or process control, Praxair offers a
wide range of pure organics and mixtures in many container
types and sizes. Our ISO 9001:2000 Certified Advanced
Application Group in Geismar, Louisiana, for example,
specializes in unusual organic matrices and trace impurities.
Praxair’s high-quality manufacturing process features:
■ Computerized phase behavior evaluation
■ High-purity assayed raw materials
■ Proprietary cylinder preparation
■ Precise gravimetric blending systems
■ Certification and/or confirmation analysis

Typical Liquid Mixtures Typical Refinery Gas Standard Trace Impurity Mixtures
ASTM D-3710 Conc. Compounds Conc. Fuel Standards
Compounds (LV%) Hydrogen 38.5% MTBE 100 ppm
Propane 1.0 Methane 15.0% Isooctane Balance
Isobutane 3.0 Propane 8.0% Dibutyl Disulfide 1 ppm
n-Butane 10.0 Ethylene 7.5% Isooctane Balance
Isopentane 9.0 Ethane 7.0% Industrial Hygiene
n-Pentane 7.0 Nitrogen 4.0% Hydrogen Sulfide Up to 300 ppm
2-Methylpentane 5.0 Carbon Dioxide 3.0% Carbon Monoxide Up to 300 ppm
n-Hexane 5.0 Propylene 3.0% Methane 2.5%
2,4-Dimethylpentane 5.0 n-Butane 2.5% Oxygen 19%
n-Heptane 9.0 Isobutane 2.0% Nitrogen Balance
Toluene 10.0 Carbon Monoxide 2.0% See pages D •185-202 for more information.
n-Octane 5.0 1-Butene 1.0% Environmental
p-Xylene 12.0 Isobutylene 1.0% Carbon Dioxide 10%
n-Propylbenzene 3.0 trans-2-Butene 1.0% Carbon Monoxide 50 ppm
n-Decane 3.0 cis-2-Butene 1.0% Nitric Oxide 100 ppm
n-Butylbenzene 3.0 Acetylene 1.0% Sulfir Dioxide 250 ppm
n-Dodecane 3.0 n-Pentane 0.5% Nitrogen Balance
n-Tridecane 2.0 Isopentane 0.5% See pages D •157-164 for more information.
n-Tetradecane 2.0 Argon 1.0%
n-Pentadecane 2.0 1-Pentene 0.1%
trans-2-Pentene 0.1% Total Sulfur Standards
cis-2-Pentene 0.1% Reduced sulfur blends
2-methyl 2-Pentene 0.1% in inert matrix.
n-Hexane 0.1% NIST traceable to H 2 S SRM.
Compounds Minimum
Conc.
Carbon Disulfide 1.0 ppm
Carbonyl Sulfide 95 ppb
Dimethyl Disulfide* 0.5 ppm
Dimethyl Sulfide 0.5 ppm
Ethyl Mercaptan 1.0 ppm
Methyl Mercaptan 1.0 ppm
Propyl Mercaptan 2.0 ppm
* Dimethyl Disulfide must be blended
separately due to instability and reactivity
with other components. Processing Hydrocarbon

1-877-PRAXAIR www.praxairdirect.com D•177