Select Hg Brochure

8/10/2019 Select Hg Brochure

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SELECT HgUltra-purification of mercury from natural gas


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Mercury is a naturally occurring

contaminant in some hydrocarbons.

It is highly toxic representing a risk tohealth and the environment. It can also

be a cause of serious equipment failure

through liquid metal embrittlement (LME)

or amalgam corrosion. Treatment using

SELECT Hgprovides a robust mercury

removal solution, reducing toxicity and

protecting plant and equipment.

Our SELECT Hg products use proven

mercury removal chemistry based on

reactive metal sulfides. These individually

formulated products react with elemental

mercury to form Cinnabar. This versatile

cost effective solution reduces mercury to

extremely low levels and can be tailored to

the operators individual requirements or

specific applications. SELECT Hg products

react with elemental mercury to form a

stable mercuric sulphide. The resulting

spent product can be simply and safely

handled through well established recycling

routes within the metals recovery industry.

SELECT Hg: Ultra-purification of

mercury from natural gas


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Protecting your operationsthrough efficient mercury removal

Features Reliable, predictable performance

Operating flexibility

Cost effective mercury removal

Low pressure drop

Ultra purification

Simple vessel change-outs

Straight forward disposal ofspent media

Benefits Protection of valuable downstream

plant and equipment

Protection of downstream processes

Environmental compliance

Reduced toxicity of gas

Simple unmanned operation

Technical support throughout

operation Warranted performance in service

M-I SWACO purification products are

used in fixed bed processes which are

simple, easy to operate and require

minimal operator intervention.

Product usage is dependent only on

the amount of mercury that passes

through the bed. This economically

matches the need for removal with

variations in system flow conditions

and outlet specifications, regardless

of the total volume or other common

components of the process stream.

The flexibility of the fixed bed

process allows the system to adapt to

variations in process conditions that

may result from changes in operating

requirements or tighter regulations, often

without additional capital equipment

or costly system retrofitting.

Predictable pressure drops, long bed-

life, easy and safe handling, and a simple

reliable operation are a few of the featuresof the M-I SWACO fixed bed process.

Our Product Range SELECT Hg 100 series for removal of

mercury from natural gas.

Mercury is removed by irreversible

chemical reaction with a metal

sulphide. The metal sulphide may be

formed ex-situ or in-situ by the reaction

between a mixed metal oxide and H2S,

i.e. a desulphurization reaction.

MxOy+ H2S MSz+ H2O

Equation 1. Metal Oxide Reaction with H2S

MSx+ Hg MS(x-1)HgS

Equation 2. Metal Sulphide Reaction with Hg

The most suitable product is selected

dependent upon the process conditions

and the operational parameters

specified by the customer.


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M-I SWACO has the resources and

expertise to design purification

treatment solutions to suit a wide

range of customer requirements.

Proprietary modeling software is used

to deliver system designs that are

reliable, effective, and fit for purpose.

The most basic system design is a single

vessel. This requires a temporary bypass or

interruption to the gas flow when replacing

spent media. A lead/lag configuration

provides the greatest operating flexibility,

and facilitates continuous operation

by allowing replacement of the spent

media online. A parallel design is

generally used where pressure drop

is a critical process parameter.

M-I SWACO works with operators

to ensure all requirements are fully

understood and solutions optimized;

the final configuration and design being

determined by process conditions

and system operating philosophy.

Various options are available regarding

media support within the vessel, and

recommendations will be made on

the most suitable arrangement.

Irrespective of the vessel configuration, an

inlet separator or coalescing filter should

be placed upstream to remove free liquids

from the gas stream. This is important as

free liquids entering the bed will have an

adverse impact on system performance.

Drain

19mm Ceramic Balls

Absorbent Bed

6mm Ceramic Balls

19mm Ceramic Balls

50mm Ceramic Balls

Gas In

Gas Out

100mm

Bed Height

100mm

Foam Filter &+40 Mesh Screen

Floating Mesh Support

100mm

Top Hat Distributor

Vessel ID

25% Sample Point

50% Sample Point

75% Sample Point

Tailored treatment solutions

Schematic of a typical gas treatment vessel


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Ensuring treatment performance

Monitoring the performance of the

purification process is straightforward.

Computer modeling provides information

on the predicted performance parameters,

with flow and contaminant level

determining the bed loading. Mercury

levels in the outlet will rise gradually at

the end of the bed life, providing an early

indication of the need for replacement.

This period of gradual increase creates a

self- alarm system that can be incorporated

into routine monitoring to allow planned

and convenient replacement of the product.

Additional monitoring options around the

treatment system envelope include gas

temperature and pressure differential

measurement. These measurements

are used to confirm anticipated design

operating conditions and the impact of

changes that may occur over time.


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Engineered technical solutionsEngineering support is tailored to

match operator needs, ranging from

the simple provision of media to a

fully engineered technical solution.

M-I SWACO capability includes:

Basic system design

Media supply

Detailed engineering

Equipment design and fabrication

Media loading, unloading and system

commissioning support

Spent media disposal

M-I SWACO is also uniquely positioned

to offer effective alternative solutions

in existing fixed bed scavenger

systems. Incumbent applications can be

assessed and comparative performance

outcomes provided for review.

Change-outs and disposalIt is recommended that change-outs are

handled by catalyst handling specialists.

Each system and operating environment

is unique, and procedures will require

some variation, based on the requirements

of the operator. M-I SWACO personnel

are available to support on-site activities

as needed. We will provide assistance

in determining the best option for the

recycling/disposal of the spent media,using well established disposal routes.

Delivering solutions around the globe


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Operator Focused Solutions

Quality assuranceand technical supportM-I SWACO SELECT Hg production

processes are ISO 9000 certified and all

products are manufactured to stringent

quality specifications. Custom software

modeling provides predictability and

enables the development of best-

fit system design and operations

for each site. We support the

application through everystep necessary to ensure a

successful process with highly

trained and experienced

technical personnel.

Global research networkM-I SWACO has an active Research

and Product Development program

and a global network of specialist

laboratories where fixed bed absorbent

technology can be safely tested. A

global network of technical centres is

also available with facilities in Houston,

Aberdeen, Stavanger, Dubai and Perth.

These world class facilities ensure that

our customers have immediate access tothe latest state-of-the-art solutions for

the effective removal of contaminants

from gas and light liquid hydrocarbons.

The right people for the jobCustomer service is a top priority at

M-I SWACO, where products, systems and

services are backed by a comprehensive

support network focused on delivering

fast, effective and safe on-site services.

From support with media loading, to

unloading and disposal of spent media totechnical support onsite M-I SWACO

delivers its expertise to customers

field locations around the world.

Put SELECT Hg to work for you

To find out more about SELECT Hg

and other purification technologies

available, contact your local

M-I SWACO representative.


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