DUPONT <DD> UP ON RECOMMENDATIONS Shares of Du Pont Co rose today after accumulating recommendations from Shearson Lehman Brothers and First Boston, traders said. Du Pont, which opened with a two point gain, stood at 109-1/8, up 1-1/8. First Boston's analyst was not available for comment. Analyst Theodore Semegran of Shearson said he raised his earnings estimates for the company to 7.25 dlrs a share in 1987 and eight dlrs a share in 1988. The company earned 6.35 dlrs a share in 1986. "Good domestic demand, higher operating earnings and a strng export business, probably benefitting from a lower dollar and effects of reduced imports in chemicals will continue to aid Du Pont." He also noted that energy earnings in the first quarter are better than expected because of the rise in crude prices. Semegran expects first quarter earnings of about 1.85 dlrs a share from 1.67 dlrs last year. He also expects the company to raise its annual dividend about 20 to 30 cts a share, from its current dividend of 3.20 dlrs a share, "and a stock split is possible but it has a low probablility."