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USE OF DILUTE POLYETHYLENE GLYCOL DIMETHYL ETHER SOLVENTS TO REMOVE RESIDUAL OILS AND GREASES FROM NEWLY FABRICATED GAS SEPARATION EQUIPMENT

IP.com Disclosure Number: IPCOM000240259D
Publication Date: 2015-Jan-16
Document File: 1 page(s) / 193K

Publishing Venue

The IP.com Prior Art Database

Abstract

Absorption technologies are often used for gas phase separations where acid gases such as CO2, H2S, and mercaptans need to be removed from process streams for safety and/or process purposes. Absorption technologies generally use either chemical or physical solvents. Sometimes these solvents do not work as intended in newly constructed absorption/stripping systems. A dilute aqueous mixture of PEGDME is effective at removing residual oils and greases of newly manufactured equipment and leads to improved process performance.

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Use of dilute polyethylene glycol dimethyl ether solvents to remove residual oils and greases from newly fabricated gas separation equipment

Absorption technologies are often used for gas phase separations where acid gases such as CO2, H2S, and mercaptans need to be removed from process streams for safety and/or process purposes. Absorption technologies generally use either chemical or physical solvents. Sometimes these solvents do not work as intended in newly constructed absorption/stripping systems.

Newly fabricated columns, metal internals (such as trays and random/structured packing), and accessory metallic equipment often have residual oils or greases present due to the metal cutting process. These residual oils or greases can cause solvent foaming which dramatically reduces separation efficiency in a gas treating facility. To avoid this reduced performance, it is useful to remove these residual oils/greases before introducing the acid gas treating solvent.

One common physical solvent in the acid gas treating industry is polyethylene glycol dimethyl ethers (PEGDME). This solvent has a very high absorption affinity for heavy hydrocarbons such as cutting oils and greases. A dilute aqueous mixture of PEGDME (1-10 wt% PEGDME) is effective at removing residual oils and greases of newly manufactured equipment. This oil/grease removal process can also be utilized on equipment other than gas treating equipment. After this dilute PEGDME wash is drained from the sys...