The new scale and corrosion inhibitor from FMC

Belclene® 494 is the new scale and corrosion inhibitor from FMC for use in open evaporative cooling systems. It combines the functionality of both polymer and phosphonate in one molecule to provide the carbonate and corrosion control properties associated with phosphonates as well as the phosphate and iron scale control normally associated with sulphonated copolymers. This multifunctionality allows substitution of two raw materials with one, thereby reducing formulated product cost.

Description
Belclene 494 is a multifunctional scale and corrosion control additive for open evaporative cooling systems. The active ingredient is a phosphonated, sulphonated carboxylic acid. The CAS number is 156105-39-4.

Typical physical properties
Appearance		clear to slightly turbid yellow liquid
Solids content		47.5-50.0%
pH		4.5-5.5
Specific gravity at 20°C (68°F)		1.39
Viscosity at 25°C (77°F)		100cst
Total phosphorus (as P)		1.5%
Freezing point		°C(°F)

Stability
No loss of product activity has been observed during 12 weeks' exposure to the following conditions:

storage at 0°C
storage at 50°C
exposure to UV Light
freeze/thaw recovery cycle
dilution at pH 2
dilution at pH 12

The product is not affected by exposure to chlorine or other oxidising biocides. This has been demonstrated by chlorine consumption tests as well as by GPC and NMR analysis.

Belclene 494 is thermally stable at temperatures up to 280-C (536-9.

Tests have also shown that Belclene 494 has excellent calcium tolerance as shown in figure 1.

Figure 1 : Calcium tolerance of Belclene 494

Conditions:
     pH 9
     60°C
     1000 mg/l as CaCO₃

Belclene 494 is fully compatible with other additives typically used in cooling water formulations.

Monitoring and control
The presence of phosphorus on the molecule means that Belclene 494 can be measured by the standard Hach® phosphonate method. Laboratory tests have shown a straight line correlation between product concentration and UV absorbance at 890nm from 0-20 mg/l active product. (0-0.6 mg/l as P)

The test reagent concentration should be selected and calibration curves prepared as appropriate to the particular formulation and application.

Logistics
Classification		not hazardous for conveyance and supply
Packaging		HDPE 220L XL-ring Mauser drum height 935mm diameter 580mm gross weight 258.5 kg net weight 250 kg

Under CPL regulations Belclene 494 is classified as non-corrosive to mild steel or aluminium.

Further details on safety and handling are available in the materials safety data sheet on this product.

Process Additives Division

Warranty - Patent Position
The information contained herein is, to our knowledge, true and accurate. Because conditions of use are beyond our control, we make no warranty or representation, express or implied. except that the products discussed herein conform to the chemical descriptions shown on the labels. Nothing contained herein should be construed as permission or recommendation to infringe any patent. No agent, representative or employee of this company is authorised to vary any terms of this notice.