(136b) Use of Extractive Separation Technology for Removal of Acid Contaminants from LPG to Meet Product Specifications

Liquefied petroleum gas (LPG) is a typical hydrocarbon product produced by refineries and gas plants with a wide range of commercial and industrial uses. LPG streams are usually sour with contaminants that can lead to pipeline corrosion and cause the product to be off
specification. Contaminants commonly found in LPG streams are hydrogen sulfide (H2S), carbon dioxide (CO2), and other sulfur compounds such as mercaptans, carbonyl sulfide (COS), carbon disulfide (CS2) and elemental sulfur. The removal of contaminant species from LPG and other fluids is required in order to significantly reduce corrosion potential from LPG products and make the product suitable for transportation or use in downstream processes.,This study investigated the ability of Pentair’s extractive separation technology to remove acid,contaminants from an LPG stream that routinely failed the copper strip test. The goal of this,study was to determine the root cause of the copper strip test failures and understand the,impact of factors such as contact stages and variable contact time on the removal efficiency of,each individual contaminant species.