Chemical Engineering January 2017 - 37

WHEN CLEAN AIR
MATTERS TO YOU
Short on space and dreaming of a low maintenance
RTO system for VOCs and HAPs?
The Ecopure®
RL saves valuable space
and maintenance costs and can achieve the
FIGURE 3. Corrosion classification coupons (CCCs) are used to establish baseline
corrosion data
of damage as 25,000 ppb of ammonia. Each site may
have different combinations and concentration levels
of corrosive gaseous contaminants. Performance
degradation can occur rapidly or over many years,
depending on the particular concentration levels and
combinations present at a site.
The " lead-free " transition. A typical failure mechanism
of electronic systems in these environments is the reaction
of atmospheric sulfur with exposed metals - particularly
copper and silver. These metals are found in
printed circuitboard traces, integrated circuit (IC) leads
and device terminations. Copper sulfide (Cu2S) or silver
corrosion products can grow and creep across surfaces
like IC packages and printed circuitboard substrates.
However, one failure mechanism caused by the leadfree
transition was not foreseen by the industry - products
with an immersion silver (ImmAg) surface finish will
creep-corrode in what some electronic equipment manufacturers
consider to be high-sulfur environments. The
number and types of corrosion failures have increased
since the implementation of RoHS. The most frequent
failures are with the most common components, which
include hard disk drives (HDD), graphic cards, motherboards,
dual inline memory modules (DIMMs), capacitors
and transistors.
Historically, the use of silver in electronic assemblies
has been a reliability risk unless the silver is protected from
the environment. Silver creep corrosion (electromigration)
can occur quite readily in humid environments, especially
in the presence of small amounts of atmospheric
sulfur compounds and chlorides, which are common in
many industrial environments. More than thirty years
ago, DCS manufacturers, such as Digital Equipment
Corp. (DEC), ABB and Honeywell, described their conCHEMICAL
ENGINEERING WWW.CHEMENGONLINE.COM
highest energy efficiency on the market, all
while maintaining a 99 % DRE. With fewer
moving parts, smoother operation, and a
more compact design the Ecopure®
the answer to your air abatement needs.
RL is
www.durr-cleantechnology.com
Circle 15 on p. 62 or go to adlinks.chemengonline.com/66424-15

http://www.durr-cleantechnology.com http://WWW.CHEMENGONLINE.COM http://adlinks.chemengonline.com/66424-15

Chemical Engineering January 2017

Table of Contents for the Digital Edition of Chemical Engineering January 2017

Contents
Chemical Engineering January 2017 - Cover1
Chemical Engineering January 2017 - Cover2
Chemical Engineering January 2017 - Contents
Chemical Engineering January 2017 - 2
Chemical Engineering January 2017 - 3
Chemical Engineering January 2017 - 4
Chemical Engineering January 2017 - 5
Chemical Engineering January 2017 - 6
Chemical Engineering January 2017 - 7
Chemical Engineering January 2017 - 8
Chemical Engineering January 2017 - 9
Chemical Engineering January 2017 - 10
Chemical Engineering January 2017 - 11
Chemical Engineering January 2017 - 12
Chemical Engineering January 2017 - 13
Chemical Engineering January 2017 - 14
Chemical Engineering January 2017 - 15
Chemical Engineering January 2017 - 16
Chemical Engineering January 2017 - 17
Chemical Engineering January 2017 - 18
Chemical Engineering January 2017 - 19
Chemical Engineering January 2017 - 20
Chemical Engineering January 2017 - 21
Chemical Engineering January 2017 - 22
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Chemical Engineering January 2017 - 24
Chemical Engineering January 2017 - 25
Chemical Engineering January 2017 - 26
Chemical Engineering January 2017 - 27
Chemical Engineering January 2017 - 28
Chemical Engineering January 2017 - 29
Chemical Engineering January 2017 - 30
Chemical Engineering January 2017 - 31
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Chemical Engineering January 2017 - 33
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Chemical Engineering January 2017 - 35
Chemical Engineering January 2017 - 36
Chemical Engineering January 2017 - 37
Chemical Engineering January 2017 - 38
Chemical Engineering January 2017 - 39
Chemical Engineering January 2017 - 40
Chemical Engineering January 2017 - 41
Chemical Engineering January 2017 - 42
Chemical Engineering January 2017 - 43
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Chemical Engineering January 2017 - 45
Chemical Engineering January 2017 - 46
Chemical Engineering January 2017 - 47
Chemical Engineering January 2017 - 48
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Chemical Engineering January 2017 - 60
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Chemical Engineering January 2017 - 62
Chemical Engineering January 2017 - 63
Chemical Engineering January 2017 - 64
Chemical Engineering January 2017 - Cover3
Chemical Engineering January 2017 - Cover4
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