Procedure for the supply of nitrogen from a local air separation plant, which provides at least oxygen as a product

摘要

A process is provided for supplying nitrogen from an on-site air separation plant providing at least oxygen as a product, which entails feeding an air feed stream to an instrument-air compressor which is oversized relative to compressed air needed to feed an instrument controlling the plant, feeding at least a portion of the compressed air stream from the instrument-air compressor to a nitrogen membrane separator, thereby providing a stream of nitrogen product, and venting an oxygen-enriched air stream from the membrane.