FILTRATION APPLICATIONS FOR AROMATIC FRACTIONATION (BTX Extraction)

Aromatic Fractionation is when a For most BTX extraction units, the The most common filtration problems refinery utilizes reformate from the recovery of aromatics occurs in a in aromatic fractionation are foaming liquid-liquid extractor column while the and fouling. Solid particulates cause catalytic reformer and extracts the purification takes place in an extractive foaming resulting in reduced process aromatics rather than blend them distillation column. Steam stripping is flow and the injection of costly foaming into gasoline. The aromatics are used to remove the aromatics from inhibitors to regain control. Fouling then separated in pure benzene, the solvent. also occurs from excessive particulate toluene, and mixed xylenes concentrations and reduces operating While reformate is the major source of efficiencies in distillation and recovery products at the BTX (benzene- aromatics in most of the world, pyrolysis towers, heat exchangers, and other toluene-xylene) Unit. The BTX gasoline is also a significant source. downstream equipment. To meet is then either processed by a Pyrolysis gasoline is an aromatic rich sales quality specifications of BTX chemical unit within the refinery naphtha stream produced by an ethylene products; an optimal filtration system is or sold to a chemical facility for plant when it cracks butane, naphtha, required to remove both solid and liquid or gasoil. Pyrolysis gasoline resembles contaminants. production into a wide range of reformate and can serve as a high-octane chemicals from solvents, to fibers, blend stock for motor gasoline or for an films, and plastics. aromatics extraction unit.

Benefits of an optimized filtration system include:

• Ability to meet sales product specifications. • Use of costly anti-foaming inhibitors. • Reduction in equipment fouling. • Lower operating and maintenance costs. • Increased BTX extraction efficiency. • Increased safety and uptime leading to reduced employee process exposure. Solutions for Aromatic Fractionation (Reformate) Process Toluene Benzene Xylene

Naphtha To EDC Izomerization Condenser Unit

8 9 10

Catalytic Water Reformer Lean SRC Liquid/Liquid Liquid/Liquid Liquid/Liquid solvent Condenser Coalescer Coalescer Coalescer added Reformate Raffinate Hot solvent 1 added 5 6 7 Water Extractive Distillation Liquid Liquid Liquid Liquid Particle Particle Particle Particle Heat Column Solvent Filter Filter Filter Filter Exchanger Recovery Column

The above schematic 4 2 should be viewed as 3 Aromatics a general example of where filtration systems Liquid Aromatics-rich Liquid Particle could be located Particle Solvent Liquid Filter within an Aromatic Filter Particle

Filter Steam Distillation Tower Distillation Tower Distillation Tower Fractionation Process. These processes will vary between companies and Solvent Recycle facilities. As such, each application should be C9+ reviewed and considered Aromatics individually in order Toluene to choose the correct Trans-Alkylation system technology.

Benzene and Mixed Xylenes

Filter Solution Filter Purpose Filter Benefit

Protects downstream equipment. LiquiPleat™ Series Pleated Style Liquid Removes scale and solid Prevents heat exchanger and tower 1-4 Elements and Vessels contaminants including iron sulfites. fouling. Reduces foaming problems.

Protects coalescers and other LiquiPleat™ HF Series Removes solid particulates downstream equipment. Allows efficient “High Flow” Pleated Style Liquid from the final product. operation of coalescers to remove water 5-7 Elements and Vessels from the final product.

Maintains sales specification of final PhasePUR™ or Phase-LOK™ Series Removes suspended water product. Liquid/Liquid from the final product. Reduces disposal, maintenance, 8-10 Coalescing Elements and Vessels and reprocessing costs.

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