ResinTech SIR-700, Chromate Selective Anion Resin, 1 Cubic Foot

ResinTech SIR-700-HP is a granular gel weak base anion resin with unique epoxy polyamine functionality. It utilizes a secondary mechanism for chromate removal that causes chromium to precipitate inside the resin matrix when the feed pH is slightly acidic. ResinTech SIR-700-HP is intended for all chromate removal applications. SIR-700-HP is shipped in the acid chloride form and can be special ordered in the acid sulfate form (when ordered as SIR-700-SO4).

     - Highly Selective For Chromate and Dichromate: Secondary precipitation mechanism occurs within the resin during service, greatly enhancing chromate uptake, and resulting in large throughputs

     - Intended For Single Use: High capacity media is designed for one-time use

     - Complies With US FDA Regulations: Conforms to paragraph 21CFR173.25 of the Food Additives Regulations of the US FDA
     - Controlled Granule Size: Large granules provide good physical strength and minimal fines provide low pressure loss

    

     - Chromate Removal: ResinTech SI R-700-HP is a unique weak base anion exchanger with a secondary hybrid capture mechanism for chromate. Under neutral to slightly acidic conditions, chromate is first exchanged into the resin, then reduced to trivalent chrome which covalently bonds to the resin backbone. Throughput capacity is many times greater than that provided by the ion exchange groups alone, allowing very high loading and infrequent change-outs. Because the hexavalent chromate reduction step is both time and pH dependent, it is the rate controlling step. Operation at pH greater than 6 requires low flow rates, rest periods, or periodic soak steps at lower pH to allow the reduction step to catch up. Capacities in excess of 5 lbs of chrome (as Cr) per cu. ft. of media are routinely achieved with SIR-700-HP when operated at optimum pH and flow conditions. SIR-700-HP is not affected by common ions such as nitrate, sulfate, or chloride but can be damaged or fouled by high levels of suspended solids, iron, manganese, chlorine, etc.

     - Polymer Structure: Epoxy polyamine

     - Functional Group: Mixed amines

     - Physical Form: Granules

     - Ionic Form as Shipped: Acid chloride
     - Total Capacity: >2.1 meg/mL

     - Water Retention: 52 to 58 percent

     - Approximate Shipping Weight: 40 lbs per cu. ft.

     - Screen Size Distribution (US Mesh): 12 to 40

     - Maximum Fines Content (< 50 mesh): 1%

     - Resin Color: Amber to yellow

     - Maximum Continuous Temperature: 100°F

     - Minimum Bed Depth: 24 Inches

     - Backwash Expansion: 25 to 50 percent

     - Maximum Pressure Loss: 20 psi

     - Operating pH Range: 4 to 7 SU

     - Service Flow Rate: 1 to 4 gpm per cubic foot