By Patrick Raleigh UT On-line/news editorSt. Louis, Missouri-Solutia Inc. is raising its process for adipic acid by $0.05/lb with effect from 15 May. The increase is on top of the company's earlier $0.05/lb rise, which went into effect on 1 April."The [latest] price increase is being driven by the demand for adipic acid in both the merchant and captive markets, as well as continued high raw material costs," said Mike Berezo, director, Solutia Nylon Intermediates and Business Management in a 30 April statement."