DBNPA (2,2-dibromo-3-nitrilopropionamide)

Manufacturer Name: Dow Time-Release Antimicrobial CT Tablets

Manufacturer: Dow Chemical

Now DOW Time-Release Antimicrobial CT tablets come with a protective water-soluble coating rather than a film overwrap. It's a simpler product that's easier to handle.

Minimize Handling Hazards and Simplify Treatment Procedures for Smaller Alkaline System Cooling Towers

If you're already familiar with DOW Time-Release Antimicrobial CT¹, you know it's a solid form of DBNPA (2,2-dibromo-3-nitrilopropionamide), a highly effective biocide. The solid product form made DBNPA truly practical for smaller cooling towers.

A Simpler Coated Tablet
Now we've upgraded the DOW Time-Release Antimicrobial CT to eliminate the protective water-soluble film overwrap on each tablet. Instead, each tablet now comes with a water-soluble protective coating. It's a simpler, better-looking product that's easier to handle. Arid it performs just like the original.

Lower Treatment Costs Can Mean Increased Profits
Because DOW Time-Release Antimicrobial CT tablets provide highly effective microbial control at very low use rates, they're much more cost-effective than KathonŽ biocide or glutaraldehyde. And they're cost-competitive with bromine but with more effective, longer-lasting control. Results of studies comparing wholesale biocide costs in alkaline system comfort cooling towers show that DOW Time-Release Antimicrobial CT tablets can increase your profitability on every tower you treat (see below).

Six-Month Wholesale Treatment Costs in Three Alkaline System Comfort Cooling Towers²

		Tower 1		Tower 2		Tower 3
DOW Time-Release Antimicrobial CT		$98.44		$42.80		$59.92
Previous costs using a competitive biocide (isothiazolone)		$228.00		$120.00		$120.00

How DOW Time-Release Antimicrobial CT Makes Small Alkaline System Treatment Easy, Reliable, and Profitable

A simple time-release tablet that delivers biocide continuously
DOW Time-Release Antimicrobial CT tablets incorporate solid DBNPA in a water-soluble matrix that releases biocide by dissolving at a controlled rate. Each tablet takes about three weeks to dissolve, maintaining an effective biocide level in 500-1,000 gallons (1895-3790 l) of system volume.

No need for system modifications, no complex equipment
DOW Time-Release Antimicrobial CT is an elegantly simple approach to system treatment. The right number of tablets are simply suspended in a mesh bag and placed in the tower. No sidestrearn flow or bypass feed systems are required. There are no pumps or other complex mechanical equipment to maintain.

Suspended in its mesh bag, each tablet of DOW Time-Release Antimicrobial CT dissolves at a controlled rate, maintaining an effective biocide level in 500-1,000 gallons (1895-3790 l) of system volume.

Easy to handle safely
Tablets of DOW Time-Release Antimicrobial CT are solid and won't dust like free-flowing powders can. They won't splash, spill, or leak like liquids. The protective coating on each tablet provides very good protection against worker exposure and dusting. Plus, their controlled-release form requires handling only once every three weeks. Although chemical worker's goggles and gloves should be worn while handling DOW Time-Release Antimicrobial CT, these safety features significantly reduce the handling hazards associated with liquids and powders.

Convenience and economy that can increase your profit
Since each tablet lasts about three weeks there's less time involved with treatment and monitoring of small towers. Once a dosage level is established, there's little chance of overdosing and wasting biocide. DOW Time-Release Antimicrobial CT comes packaged 25 tablets to an easily transported plastic pail -- enough to treat a typical 1,000-gallon (3790 l) system for a year. There's no drum handling or complex equipment to worry about. That all means less time spent and more profit on every tower you treat.

Works with most treatment programs; excellent performance in alkaline systems
DBNPA, the active ingredient in DOW Time-Release Antimicrobial CT, is compatible with other treatment chemicals (the only known exception is mercaptobenzothiazole). It maintains reliable control in systems running at acidic, neutral, or alkaline PH.

The best environmental profile you can get
DBNPA degrades very quickly in aqueous environments. At neutral pH, its half-life is about nine hours³. Continuous biocide release by the tablet maintains effective control in the tower, while the biocide in the blowdown discharge degrades quickly. So it's easy to meet strict environmental regulations on tower discharge.

1. EPA registration No. 464-624

2. Note: Towers were comfort systems ranging from 600-2,000 gallon (2274-7580 l) capacity; temperatures ranged from 10 to 13°F (5 to 7°C); operating at pH 8.8.

3.  Exner, Burk, and Kyriacou: Rates and Products of Decomposition of 2,2-dibromo3-nitrilopropionamide, J. Agr., Food, Chem., Vol. 21, No. 5,1973.

NOTICE: No freedom from any patent owned by Seller or others is to be inferred. Because use conditions and applicable laws may differ from one location to another and may change with time, Customer is responsible for determining whether products and the information in this document are appropriate for Customer's use and for ensuring that Customer's workplace and disposal practices are in compliance with applicable laws and other governmental enactments. Seller assumes no obligation or liability for the information in this document. NO WARRANTIES ARE GIVEN; ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY EXCLUDED.