PRODUCT DESCRIPTION

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PUROLITE® PD 206 is a dry polishing media specifically formulated to remove by-productsremaining from the transesterification process to produce methyl ester or B100.

PUROLITE® PD 206 is designed preferably for use in “purification” vessels installed after the phase separation and demethylation stage. PUROLITE® PD 206 can also be installed after phase separation and before the demethylation step to remove catalyst and glycerin and preventback reactions, which form mono and di-glycerides. This media replaces magnesium silicate “wash” and may reduce or replace water wash. PUROLITE® PD 206 improves plant productivity and lowers operation costs while enabling ASTM or EN specifications for B100 to be achieved.

PUROLITE® PD 206 has a long life before exhaustion processing up to 2000 lb of B100 per pound of dry media depending on the level of impurities in the untreated biodiesel. PUROLITE® PD 206 functions both as a dehydrating (desiccant) media and as an ion exchange polishing media. As a desiccant PUROLITE® PD 206 has a high loading capacity to adsorb free glycerin and trace methanol and water. Additionally the exceptional exchange capacity removes residual catalyst, and salts that may remain after phase separation.

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PUROLITE® PD 206 is flow able both in the dry form and when exhausted, making it easy to handle during installation and removal from “purification” vessels. PUROLITE® PD 206 is fully compatible for use in methyl ester and ethyl ester purification processes.

FAQ

What is PUROLITE_® PD 206?

PUROLITE_® PD 206 is a dry combined desiccant and ion exchange media specially formulated to enable maximum removal of residual glycerin and trace methanol and water, as well as salts, catalyst, and soaps from crude biodiesel. PUROLITE_® PD 206 is designed for use in “purification” vessels installed after phase separation and de-methylation. PUROLITE_® PD 206 improves productivity and lowers operation costs while enabling ASTM or EN specifications for B100 to be achieved.

What are the benefits of using PUROLITE_® PD 206?

PUROLITE® PD 206 has high adsorption capacity and is a cost effective method of purifying crude biodiesel. This product allows efficient attainment of ASTM or EN specifications. PUROLITE® PD 206removes ionic and hydrophilic compounds in B100. It is a simple, low energy process to reduce or eliminate water wash steps and other inorganic processes. Higher biodiesel production can be obtained by reducing processing time compared to alternate purification methods. PUROLITE® PD 206 is very efficient so it is strongly recommended that mechanical methods of separating be optimized before final polishing to insure maximum economic benefit from PUROLITE® PD 206.

How much PUROLITE_® PD 206 do I need?

Approximately 1500-2000 lbs of crude biodiesel (200-275 gal) with less than 0.05% (500 ppm) combined level of glycerin, water and methanol can be processed by one pound of PUROLITE® PD 206. If a system produces one million gallons of B100 annually with an average of 500 ppm of hydrophilic compounds (glycerin, water or methanol) approximately 5000 pounds of PUROLITE® PD 206 will be required at a cost of $0.03 per gallon of B100.  If the level of hydrophilic compounds averages 1000 ppm approximately 10,000 pounds of PUROLITE® PD 206 will be required at a cost of $0.06 per gallon of B100. This estimation will vary as levels of water, methanol and glycerin will change the loading and the operating economics. Each location should carefully consider economics for their system.

HOW ION EXCHANGE RESIN WORKS

Ion exchange is an exchange of ions between two electrolytes or between an electrolyte solution and a complex. In most cases the term is used to denote the processes of purification, separation, and decontamination of aqueous and other ion-containing solutions with solid polymeric or mineralic ion exchangers.

Typical ion exchangers are ion exchange resins (functionalized porous or gel polymer), zeolites, montmorillonite, clay, and soil humus. Ion exchangers are either cation exchangers that exchange positively charged ions (cations) or anion exchangers that exchange negatively charged ions (anions). There are also amphoteric exchangers that are able to exchange both cations and anions simultaneously. However, the simultaneous exchange of cations and anions can be more efficiently performed in mixed beds that contain a mixture of anion and cation exchange resins, or passing the treated solution through several different ion exchange materials.

Ion exchangers can be unselective or have binding preferences for certain ions or classes of ions, depending on their chemical structure. This can be dependent on the size of the ions, their charge, or their structure. Typical examples of ions that can bind to ion exchangers are:

• H⁺ (proton) and OH⁻ (hydroxide)
• Single charged monoatomic ions like Na⁺, K⁺, or Cl⁻
• Double charged monoatomic ions like Ca²⁺ or Mg²⁺
• Polyatomic inorganic ions like SO₄²⁻ or PO₄³⁻
• Organic bases, usually molecules containing the amino functional group -NR₂H⁺
• Organic acids, often molecules containing -COO⁻ (carboxylic acid) functional groups
• Biomolecules which can be ionized: amino acids, peptides, proteins, etc.

Ion exchange is a reversible process and the ion exchanger can be regenerated or loaded with desirable ions by washing with an excess of these ions.

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