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DuoPUR Acid Purification System

Milestone has developed the duoPUR, a sub-boiling distillation system which allows laboratories to make their own high-purity acids. The duoPUR can produce 1 liter (500 mL per quartz unit) of high-purity acid from reagent grade acid in about six hours.

Schematic of single acid still

The duoPUR consists of two high-purity quartz distillation units. Each unit contains two infrared heating elements, a water-cooled condenser, and a reagent collection bottle. The distillation process is microprocessor-controlled, allowing the user to set the distillation time and power level.

 

 

Cost Savings
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calculatorProducing high-purity acid on demand reduces the cost of 5 liters of high-purity acid to about $90. The savings on reagents alone dramatically reduces the total cost per sample. The duoPUR also gives you the ability to re-purify acids that have become contaminated, further adding to your cost savings.

To determine your potential return on investment, use our quick and easy duoPUR Cost Savings Calculator.

0% APR for 12 Months
 

12 months - 0%
24 months - 7.75%
32 months - 9.5%
DuoPur
$1220.83
$660.91
$520.00
SubPur
$829.17
$448.88
$353.00
Subject to approval

Easy Operation
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  1. Fill the acid/water still with reagent grade chemicals.
  2. Program the distillation cycle.
  3. After preset time, unit switches off.
  4. If acid/water is completely distilled before the end of the cycle, a thermal switch will automatically turn the unit off.

Technical Information
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subPUR duoPUR
Number of distillation units 1 2
Heating elements 2 with gold diffuser 4 with gold diffuser
Power rate 1250W 1250W
Power control Microprocessor in 1% increments from 0 to 100%
Temperature control Thermal switch to prevent overheating in absence of acids
Water cooling Automatic ON/OFF through solenoid valve
Control terminal LCD display, 2x20 lines with up to 10 programs in memory
Dimensions 55 x 35 x 60 cm
(21 x 14 x 24 in.)
Weight 20 kg (44 lbs.) 22 kg (48 lbs.)

Comparison of trace metal contamination in select high-purity nitric acids

Note: For additional information, see our Acid Purity technical note, with comparative data provided by actual DuoPUR customers.

duoPUR
double distilled		 Fisher
OptimaTM		 Baker
Ultrex® II
Ti 5.5 ± 1.1 < 20 < 100
V 0.8 ± 0.4 < 1 < 20
Cr 3.1 ± 0.7 < 10 < 50
Mn 1.4 ± 0.4 < 1 < 20
Co 0.5 ± 0.3 < 1 < 20
Ni 8.1 ± 3.0 < 10 < 100
Cu 10 ± 2.5 < 2 < 50
Zn 12 ± 3.2 < 2 < 100
Concentration shown in pg/g.

Trace Element Concentration at 300W of the Most Common Digestion Reagents

HNO3 HCl H2O
Al < 0.05 < 0.08 < 0.05
Cd 0.0008 0.01 0.01
Cu 0.03 < 0.08 0.04
Fe 0.1 0.5 0.3
Pb 0.03 0.05 0.02

Concentration shown in ng/mL (ppb).

Typical Yields

Power HNO3 HCl H2O H2SO4
200W 51.53 46.95 66.0 -
400W 145.71 156.52 174.0 -
600W 235.71 260.85 270.0 13.0
800W 325.71 375.65 360.0 26.09
1000W 420.00 443.48 456.0 39.13
Yields shown in mL/h.

2007 © Milestone Inc. :: email: mwave@milestonesci.com call: 866-995-5100