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Westlake Chemical Corp. will spend $250 million to $300 million constructing a chlor-alkali plant in Louisiana beginning in the second half of 2013, the chemical maker said Tuesday.

The chlor-alkali process makes chemicals through electrolysis of salt water. The plant will be built at the company's vinyl manufacturing complex in Geismar, La.

The plant is expected to add 100 permanent positions and 400 to 500 construction jobs.

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