| AQUAMAG® For SOx Scrubbing Background
Currently, caustic soda is the most commonly used chemical in SOx scrubbers for pH
control. With the price of caustic soda elevated, manufacturing and power plants evaluate
methods for usage reductions of caustic soda. One method of caustic soda reduction and
cost savings is the use of AQUAMAG® Magnesium Hydroxide slurry in SOx scrubbers.
Application
The typical AQUAMAG addition point is the same location as the caustic soda addition
point in the SOx Scrubber. With the use of AQUAMAG, 30% reduction in chemical consumption
is estimated compared to caustic soda on a dry basis. AQUAMAG usage is advised for
scrubbers that are either venturi or randomly packed scrubbers. If the scrubbing column is
randomly packed, we advise engineering data be reviewed to insure packing does not go dry.
Chemistry
Below are three series of reactions which occur in the magnesia scrubbing-regeneration
process. In the first series, the following reactions predominate. Sulfur dioxide
absorption is represented by the formation of magnesium sulfite hexahydrate followed by
its further reaction with sulfur dioxide to form magnesium bisulfite, see reactions
12.1-12.3:
SO2 + Mg(OH)2 + 5H2O ? MgSO3.6H2O? (12.1)
SO2 + MgSO3.6H2O ? Mg(HSO3)2 + 5H2O (12.2)
Magnesium bisulfite neutralization is represented by the following reaction:
Mg(HSO3)2 + Mg(OH)2 + 4H2O ? 2MgSO3.6H2O? (12.3)
AQUAMAG Pricing:
For use in the savings example below, we have assumed an AQUAMAG price of $400.00/dry
ton delivered. (Please contact your Premier sales representative for specific pricing
applicable to your account and plant location.)
Savings Example:
Below is a chart of estimated cost savings for the use of AQUAMAG vs. caustic soda.
Estimated Annual Cost Savings AQUAMAG vs.
Caustic Soda
Caustic Soda Price ($/dry ton) |
Current 50%Caustic
Soda Flow (GPM) |
Savings at Caustic
Price $300.00 |
Savings at Caustic
Price $350.00 |
Savings at Caustic
Price $400.00 |
Savings at Caustic
Price $450.00 |
Savings at Caustic Price $500.00 |
| 0.5 |
$15,087 |
$52,806 |
$90,525 |
$128,244 |
$165,963 |
| 1.0 |
$30,175 |
$105,613 |
$181,051 |
$256,489 |
$331,927 |
| 1.5 |
$45,262 |
$158,419 |
$271,576 |
$384,733 |
$497,890 |
| 2.0 |
$60,350 |
$211,226 |
$362,102 |
$512,978 |
$663,854 |
| 2.5 |
$75,438 |
$264,033 |
$452,628 |
$641,223 |
$829,818 |
| 3.0 |
$90,525 |
$316,839 |
$543,153 |
$769,467 |
$995,781 |
| 3.5 |
$105,613 |
$369,646 |
$633,679 |
$897,712 |
$1,161,745 |
| Note: Savings are based on a 330 day of operation per year. |
Advantages
- Stable Pricing compared to Caustic Soda.
- Safe, non-hazardous, both for the environment and personnel.
- Readily available, multiple manufacturing locations in U.S.A.
Plant Trials
Premier Chemicals, LLC field service personnel can provide assistance in running
product plant trials in your SOx scrubber. The product trial will show the
effectiveness/cost savings of AQUAMAG. The cost for doing a trial is the freight cost to
bring equipment to your plant site and the cost of AQUAMAG used during the trial only.
For more information please contact Premier Chemicals, LLC at 1-800-227-4287.
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