Scott Specialty Gases
HYDROCARBON AND CHEMICAL MIXTURES

Changes in ambient temperature may lead to phase changes in hydrocarbon calibration mixtures. When this happens, the resulting composition may differ from the original composition. In a gaseous mixture, heavy components may condense at low ambient temperatures. In liquid mixtures, vaporization of one or more lighter components will occur as liquid is withdrawn from a cylinder, or if ambient temperature increases significantly above the temperature at which the mixture was made.

Temperature and pressure changes may cause single-phase hydrocarbon mixtures to form two phases. Analytical or calibration work may be in error if a cylinder is used in which phase changes have occurred. Scott uses "equations-of-state" developed over our 45 years of experience to predict the response of hydrocarbon gas mixtures to temperature and pressure changes. This allows us to specify the pressure and temperature at which a hydrocarbon gas mixture can be produced and still maintain a single phase, and to alert our customers to potential composition problems due to ambient temperature.

Hydrocarbon Chromatographic Standards
A virtually unlimited combination of compounds and concentrations is available from Scott, including chromatographic blends acquired from the Phillips Chemical Company. Our calibration mixtures are invaluable for calibrating instruments when analyzing trace impurities in petrochemical feedstreams or measuring the composition of hydrocarbon product streams in natural gas processing.

GPA Natural Gas Liquid Blends	Gas Mixtures
Blend 1 Blend 2 Blend 3 Blend 4 Blend 5 Blend 6	G-6 G-7 G-8

GPA Gas Reference Standard

Hydrocarbon Mixtures
Mixture 31 Mixture 32 Mixture 33 Mixture 34 Mixture 35 Mixture 36 Mixture 37	Mixture 38 Mixture 39 Mixture 40 Mixture 41 Mixture 42 Mixture 43 Mixture 44

ASTM Blends

Section L-5 Section L-6 LPG Reference Standard A LPG Reference Standard B LPG Reference Standard C LPG Reference Standard D LPG Reference Standard E

Cylinder Heating and Insulation Jackets

Custom Hydrocarbon Mixtures – please inquire.

RELATED PRODUCT LITERATURE

Hydrocarbon Chromatographic Standards (pdf) Natural Gas Applications (pdf) Example of Multi-Component Hydrocarbon Mixture Liquid Phase Mixture Delivery Cylinder Heating and Insulation Jackets (pdf)

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