Chemspec International Ltd shares rose nearly 11 percent in their debut trading session on Wednesday following the Chinese specialty chemical maker's initial public offering.

Chemspec ADRs started trading at $9.45, at a 5 percent premium, and later were up 10.9 percent at $9.98 on the New York Stock Exchange.

Chemspec raised $72.7 million in its IPO Tuesday night after pricing the deal at $9 per American Depositary Receipt, the top of its estimated range.

Chemspec, which sold 8.08 million ADRs, was the eighth company to go public on a U.S. exchange in 2009.

Another Chinese company, water treatment equipment supplier Duoyuan Global Water Inc, priced its IPO at $16 per ADR on Wednesday, raising $88 million. The stock is set to begin trading on Wednesday on the New York Stock Exchange.

(Reporting by Phil Wahba; Editing by Lisa Von Ahn)