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Mercury removal from cracked gas

A technology for copper sulfide and gaseous hydrocarbons, which is applied in the field of mercury removal, and can solve problems such as the difficulty of unsaturated hydrocarbon treatment and proof

Inactive Publication Date: 2012-08-29
UOP LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although copper compounds such as copper oxides and sulfides have been used to remove trace amounts of mercury from certain hydrocarbons, the treatment of unsaturated hydrocarbons that may contain acetylenes has proven to be very difficult due to the potential formation of explosive acetylenes

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  • Mercury removal from cracked gas

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Embodiment Construction

[0008] The present invention may be used to treat hydrocarbons comprising acetylene or acetylene series. Typically, 0.1% of said precursors may be present in the hydrocarbon to be treated. However, it is important to consider that any amount of alkyne may be a problem due to possible accumulation over time. The hydrocarbon stream may be from cracked gas or a stream cracked to produce ethylene.

[0009] Confirmation that materials prepared by co-forming porous basic copper carbonate and alumina powders, followed by heat treatment of the formed composite beads, followed by treatment with S to produce CuS-alumina composites do not have the tendency to form copper acetylides when treated with acetylene . Therefore, this material is suitable for use as a scavenger for mercury removal from cracked gas regeneration streams. The material is characterized by large crystals produced by coagglomeration. In addition, the CuS-alumina composite produced in the above manner has the resis...

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Abstract

This invention provides for the removal of mercury from a mixture of saturated and unsaturated hydrocarbons such as from cracked gas. The gas first is contained in a regenerable adsorbent bed that removes water and mercury and then the regenerant stream for the adsorbent bed is passed through a nonregenerable bed comprising copper sulfide to trap the mercury. Surprisingly, it was found that acetylene within the regenerant stream does not react with the copper sulfide to produce explosive copper acetylides.

Description

[0001] Priority claims from previous national applications [0002] This application claims priority to US Application No. 61 / 286,437, filed December 15, 2009. Background of the invention [0003] The present invention relates to a method for removing mercury from hydrocarbon streams. More specifically, the present invention relates to the removal of mercury from hydrocarbon streams containing large proportions of unsaturated hydrocarbons. [0004] Elemental mercury and mercury compounds contaminate crude oil derived hydrocarbon streams and natural gas. Removal of mercury from hydrocarbon streams is important due to its health effects and adverse effects of mercury causing corrosion of aluminum-containing heat exchangers. Mercury combines with aluminum causing mechanical failure and leaks. Additionally, mercury can poison some catalysts, including hydrogenation catalysts, in acetylene converters and other unsaturated hydrocarbon converters. Since no tolerable level of merc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/64B01D53/02
CPCB01D53/04B01D53/64B01D53/82B01D2253/1128B01D2257/602B01D2257/80B01D2259/40086B01J20/0237B01J20/0285B01J20/08B01J20/3433B01J20/3458B01J2220/42B01J2220/56C10G25/003C10G25/12C10G2300/201C10G2300/205B01D53/02
Inventor V·I·卡纳兹雷夫J·K·格拉瓦拉
Owner UOP LLC
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