Indexes for refining chemicals increase at different rates

The costs of two chemicals used in crude refining changed little for the 3 years, 2002-04, while the costs of three others varied significantly.The accompanying table shows Nelson-Farrar indexes for these chemicals. Click here to enlarge imageThe two stable chemicals were hydrofluoric acid with an index constant of 414.9; and sodium hydroxide, with an index average of 529.6.Sulfuric acid rose slightly to 397.4 in the fourth quarter of 2004 from 353.0 in the first quarter of 2002. Click here to enlarge imagePlatinum increased to 762.1 in 2004 from 458.8 in the first quarter of 2002. The yearly average for 2002 was 524.9 and 762.1 was the average for 2004.Sodium carbonate experienced decr...

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