Method and apparatus for removing mercury from contaminated pipe

Details Method and apparatus for removing mercury from contaminated pipe Method and apparatus for removing mercury from contaminated pipe

1993-09-17

1996-06-25

Andrews, Melvyn

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

266148, 266149, 266165, 134 2212, 134166C, 134 2211, 137 15, 588230, C22B 4300

Patent

active

055296050

ABSTRACT:
Pipe lines for conducting natural gas become contaminated, over a period of time, by an accumulation of mercury, which occurs in minute amounts in natural gas. If used pipe is scrapped, for example by melting, mercury vapor escaping to the atmosphere poses a health hazard. To remove mercury, sections of pipe are closed at both ends by plugs having nipples for connection to a closed circuit and inert gas line connected with a pump for evacuating the line and with a source of inert gas, for example nitrogen. The closed circuit inert gas line contains a blower for circulating the inert gas repeatedly through the pipe sections and a condenser for condensing mercury vapor. The closed circuit further includes a heat exchanger for removing heat upstream of the condenser, a coordinated heat exchanger for restoring heat removed and an additional heater. The pipe sections are heated externally by an oven or internally by heated inert gas.

REFERENCES:
patent: 4849026 (1989-07-01), Steinhaus
patent: 5354357 (1994-10-01), Markovs et al.

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