NALCO CHEMICAL CORP <NLC> 3RD QTR NET Shr 51 cts vs 42 cts Net 20.3 mln vs 16.7 mln Sales 216.9 mln vs 184.5 mln Nine mths Shr 1.47 dlrs vs 1.21 dlrs Net 58.2 mln vs 47.6 mln Sales 611.2 mln vs 547.0 mln