Loews to Buy Entergy-Koch Pipeline  NEW YORK (Reuters) - Conglomerate Loews Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=LTR.N target=/stocks/quickinfo/fullquote"&gt;LTR.N&lt;/A&gt; on  Monday said it agreed to buy an 8,000-mile natural gas pipeline  system, from Entergy-Koch LP for \$1.14 billion, in a bid to  cash in on the rising U.S. demand for natural gas.