Intro to Products

ISOBUTANE

Isobutane is a structural isomer of butane, which is used as an alternative to freon gas. It is a gas with a distinct odor at ambient temperature and atmospheric pressure. 

CAS number : 75-28-5 / Molecular formula : C4 H10

Plant processes

The isobutane plant produce high-purity isobutane through distillation using the difference in boiling points of C4LPG and isobutane. After high-purity butane(C4LPG with Olefine less than 100 wt ppm) is produced through the second hydrogenation reaction with butane(C4LPG with Olefine less than 4 mol%) converted by the hydrogenation reaction of C4 Raffinate produced from each plant.

  • Hydrogenation Reaction Unit
    This unit mixes the high-purity C4LPG (with Olefine less than 4 mol%), produced in C4 hydrogenation with hydrogen, passes it through the catalytic layer of the 2-tier reactor and lowers Olefine to less than 100 wt ppm, and sends C4LPG at the bottom of the reactor to the stabilization column. The stabilization column is a packing tower, and discharges the off-gas to the top of the column, and the C4LPG at the bottom of the column to the butane separation column.
  • Isobutane Fractionation Unit
    Off gas is emitted from the upper part of the isobutane fractionation tower, and isobutane products are produced by SIDE CUT. From the bottom, C4LPG is produced.
  • Moisture Removal and DME Removal Unit
    The moisture (20wt ppm) contained in the Isobutane product is lowered by the dryer to 1wt ppm, and sent to the DME (Dimethylether) removal tower for removal of DME, and to the Isobutane storage tank.
Product uses

Isobutane is utilized as a polymer process dilution and charging gas.

  • Butane Gas
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Properties
ISOBUTANE
Specifications List
Test Item Unit Test Method Specification
ISOBUTANE M - % ASTM D 2163 MIN 95
OLEFINES Wt - ppm ASTM D 2163 MAX 100
T-ACETYLENE Wt - ppm ASTM D 2163 MAX 100
CARBONYL Wt - ppm ASTM D 4423 MAX 1
ALCOHOLS Wt - ppm ASTM D 4815 MAX 1
PHENOL Wt - ppm UOP 464 MAX 1
HYDROGEN Wt - ppm ASTM D 2504 MAX 5
OXYGEN Wt - ppm ASTM D 2504 MAX 5
CARBON MONOXIDE Wt - ppm ASTM D 2504 MAX 1
CARBON DIOXIDE Wt - ppm ASTM D 2505 MAX 1
T-SULFUR Wt - ppm ASTM D 6667 MAX 1
WATER Wt - ppm ASTM D 1744 MAX 5

* The above specifications represent standards may differ from the actual subject matter.