DUBAI, May 2 (Reuters) - Saudi Basic Industries Corporation (SABIC) is "very positive" about 2017 despite global challenges, its chief executive said on Tuesday.

Yousef Abdullah al-Benyan told reporters in Riyadh the firm was monitoring the global situation, but it was difficult to predict prices due to the uncertainty in oil markets.

Al-Benyan was speaking a day after the petrochemical maker reported an 80 percent jump in net profit from a year earlier in the first quarter of 2017.

Al-Benyan said SABIC had no plans to raise new debt, but might consider refinancing.

The company is aiming to become the world's third biggest petrochemical maker by growing its existing businesses and by making acquisitions, Al-Benyan said, adding SABIC was currently ranked number four.

(Reporting by Marwa Rashad, Reem Shamseddine in Riyadh, writing by Alexander Cornwell and Hadeel Al Sayegh in Dubai; Editing by Sherry Jacob-Phillips and Mark Potter) ((Alexander.Cornwell@thomsonreuters.com;))