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Offering Long Term Solutionsthrough Sustainable Chemistry

to the CSP industry

Polyglycols, Surfactants and Fluids

A business unit of The Dow Chemical Company

4th Annual International CSP SummitSeville, November 2010

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Dow‘s Corporate Profile

Dow combines the power of science and technology with the“Human Element” to passionately innovate what is essential tohuman progress.

Dow’s diversified industry-leading portfolio of specialty chemical,advanced materials, agrosciences and plastics businesses delivers abroad range of technology-based products and solutions tocustomers in approximately 160 countries and in high growth sectorssuch as electronics, water, energy, coatings and agriculture.

In 2009, Dow had annual sales of $45 billion and employedapproximately 52,000 people worldwide. The Company’s more than5,000 products are manufactured at 214 sites in 37 countries acrossthe globe.

Dow Chemical Ibérica, the Spanish subsidiary of Dow, has been inSpain since the early 1960s – and considers Spain to be a strategicgrowth country for The Dow Chemical Company. Dow Ibérica hasthree production centres in Tarragona, Ribaforada (Navarra) andEstarreja (Portugal), as well as commercial sales office andheadquarters in Madrid.

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Concentrating Solar Power

DOWTHERMTM A heat transfer fluids collect, transport, and storesolar heat energy to power electricity-generating turbines.

Sustainability Profile:

Dow supplied enough fluidglobally to generate more than700 MW of electricity from thesun

Projects in Spain use more than20,000 metric tons ofDOWTHERM™ A heat transferfluids Energy produced by 12 plantsis enough to power nearly 400,000homes

These plants prevent about1350,000 tons of carbon dioxidefrom releasing into the atmosphere,vs. traditional fuels

™ Trademark of The Dow Chemical Company

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REACH status for DOWTHERMTM A

We are in compliance with REACH for DOWTHERM™ A and

its composition.

The components are fully REGISTERED, even prior to

submission deadline that is on November 30th.

Our customers can continue to specify and use

DOWTHERM™ A in their process.

All REACH information is available on our www.dow.com site

or by contacting your sales person or CIG.

™ Trademark of The Dow Chemical Company

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DOWTHERMTM A – Reliability of Supply

Integrated manufacturing for key raw materials in the United States

(Texas and Louisiana)

DOWTHERM™ A raw materials have additional Dow uses:

Surfactants, Additives, Resins

Well maintained, state-of-the-art facilities and operations

Back integrated in the key raw materials

Large blending operations in North America and Europe

Large storage capabilities in North America, Latin America, Europe

and Asia Pacific

We have not failed with any of our customers, allowing them to safely

start on time!

TM Trademark of The Dow Chemical Company

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Supply Chain and Logistics Excellence

At Dow, safety, efficiency and cost-effectiveness are our highestpriorities.

Specific intermediate storagecapabilities have been created

With over 300 warehouses and122 terminals, we have shippingsites in 200 countries.

We have a dedicated team ofprofessionals for Dow CSP Fluids.

Consult customers to set their plantsto the right pre-conditions

Freeze protection

Cleaning & Drying of HTFequipment.

Unloading station equipment

Unloading methods and procedures

Safety

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DOWTHERMTM A: Sustainableperformance

DOWTHERM™ A thermally stable up to 400 deg Celsius. With a HTTFsystem properly designed and no temperature incursion above 400 degC, fluid is proven extremely stable.

A high purity fluid is required for high temperature system or fasterdegradation will occur. Dow supplies very high purity DOWTHERM™Ato enhance lifetime of its fluid.

Properly designed Systems can regularly vent off low boilingdegradation products. Online regeneration systems can be used in theHTF loop to remove high boiling degradation products also. Dow offersadvice to properly design these units.

Maintaining the high-boiling component concentration below 10% isessential:

Proper tracking of fluid composition. Ad-hoc separation of high boilers via regeneration unit (ullage system). Minimal but regular top up are needed to replace the separated degradation

products.

Dow offers support to best design the HTTF loop, as well as to trackperformance by regularly sampling and analyzing the fluid.

DOW and Valls Química are offering regeneration services for SpanishCSP.

Feedbacks from plants started ca. 20 years ago indicate that the fluid isin excellent condition.

™ Trademark of The Dow Chemical Company

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Thermal Degradation ofDOWTHERM™ A Fluid

™ Trademark of The Dow Chemical Company

0

10

20

30

40

50

60

70

80

90

100

330 340 350 360 370 380 390 400 410 420

Operating temperature [°C]

%d

eg

rad

ati

on

per

year

Testedaccording toDIN 51528

For CSP plants:

1-4% /yeardegradation productsexpected

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Handling of degradation products

Separation options:

1. Basic separation of Low Boilers via venting – replacement oftotal HTF after 10% High Boilers is reached.

2. Onsite separation via high efficiency distillation unit – externalincineration of separated products.

3. Onsite separation via flash vessel design (ullage) - highefficient separation externally.

Third option is the most economic

Low installation cost

Easy operability

Acceptable freezing point of separated products & no

corrosion problems

No care on transportation and waste handling

Dow and Valls Química, your reliable partners for

high quality external regeneration.

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Handling of degradation productswith ULLAGE system

™ Trademark of The Dow Chemical Company

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Valls Química – Dow’s partner onDOWTHERM™ A regeneration

Batch Regeneration of min. 25 up to 200MT Dowtherm™ A

Pickup of products to regenerate

Handling of transportation documents

Purify back to DOWTHERM™ A salesspecification

Minimum losses on DPO and Biphenyl

Adjustment of component level ifrequired

Handling of waste products

Own laboratory for quality control

Shipment of product back to the CSP plant

™ Trademark of The Dow Chemical Company

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Conclusion

DOWTHERM™ A fluid for Concentrated Solar Plant is

proven technology.

High Thermal stability up to 400 deg C and low degradation

level though proper use of the fluid and proper system

design.

Dow offers full support to enable CSP operators to best use

and maintain their fluid system.

Dow is proud to team up with Valls Quimica in Spain to offer

complete fluid life service to its customers.

Dow is offering long time sustainable solutions through

mastering of chemistry.

™ Trademark of The Dow Chemical Company

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Thanks!