E.i. Dupont De Nemours and Company

William J Duncan

Michael H Mainz

A process for automatically venting noncondensable contaminants from a number of process vessels heated with an organic heat transfer vapor medium involves monitoring the temperature at each vessel and intermittently venting all vessels simultaneously in response to a temperature drop at any one vessel. By venting intermittently for a predetermined period energy is conserved. Equipment costs are minimized by simultaneous venting through a single control valve.

Venting process for organic heat transfer media

There is disclosed a variable denier, multifilament yarn having a slub yarn plied with a carrier yarn and displaying high weaving performance. The yarn is characterized by a certain slub size distribution, a certain minimum number of slubs, a specified maximum number of large slubs, less than one tight spot per meter and a coherency factor of from about 4-14, said coherency factor increasing as the number of large slubs increases. A process for making the yarn is also disclosed and includes the features of feeding both feed yarn and carrier yarn to a supply jet, the feed yarn being overfed while the carrier yarn is maintained under zero net overfeed, forwarding the carrier yarn to a slub jet and forwarding the feed yarn to a foraminous surface where slubs are created and thereafter combining both yarns and passing them sequentially through a slub jet, at least one interlacing jet and, optionally, a torque jet.

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Chattanooga, TN, United States of America

William J Duncan