초록 ▼

A method for the separation of a gas mixture comprises (a) obtaining a feed gas mixture comprising nitrogen and at least one hydrocarbon having two to six carbon atoms; (b) introducing the feed gas mixture at a temperature of about 60° F. to about 105° F. into an adsorbent bed containing adsorbent m

A method for the separation of a gas mixture comprises (a) obtaining a feed gas mixture comprising nitrogen and at least one hydrocarbon having two to six carbon atoms; (b) introducing the feed gas mixture at a temperature of about 60° F. to about 105° F. into an adsorbent bed containing adsorbent material which selectively adsorbs the hydrocarbon, and withdrawing from the adsorbent bed an effluent gas enriched in nitrogen; (c) discontinuing the flow of the feed gas mixture into the adsorbent bed and depressurizing the adsorbent bed by withdrawing depressurization gas therefrom; (d) purging the adsorbent bed by introducing a purge gas into the bed and withdrawing therefrom an effluent gas comprising the hydrocarbon, wherein the purge gas contains nitrogen at a concentration higher than that of the nitrogen in the feed gas mixture; (e) pressurizing the adsorbent bed by introducing pressurization gas into the bed; and (f) repeating (b) through (e) in a cyclic manner.

대표청구항 ▼

A method for the separation of a gas mixture comprises (a) obtaining a feed gas mixture comprising nitrogen and at least one hydrocarbon having two to six carbon atoms; (b) introducing the feed gas mixture at a temperature of about 60° F. to about 105° F. into an adsorbent bed containing adsorbent m

A method for the separation of a gas mixture comprises (a) obtaining a feed gas mixture comprising nitrogen and at least one hydrocarbon having two to six carbon atoms; (b) introducing the feed gas mixture at a temperature of about 60° F. to about 105° F. into an adsorbent bed containing adsorbent material which selectively adsorbs the hydrocarbon, and withdrawing from the adsorbent bed an effluent gas enriched in nitrogen; (c) discontinuing the flow of the feed gas mixture into the adsorbent bed and depressurizing the adsorbent bed by withdrawing depressurization gas therefrom; (d) purging the adsorbent bed by introducing a purge gas into the bed and withdrawing therefrom an effluent gas comprising the hydrocarbon, wherein the purge gas contains nitrogen at a concentration higher than that of the nitrogen in the feed gas mixture; (e) pressurizing the adsorbent bed by introducing pressurization gas into the bed; and (f) repeating (b) through (e) in a cyclic manner. uct into a bone defect and then covering said bone mineral product and said bone defect with a collagen membrane. 9. The method of claim 8 wherein said collagen membrane is comprised of a layer of collagen II. 10. The method of claim 8 wherein said membrane comprises a matrix layer predominantly of collagen II and having an open sponge-like texture, and at least one collagen barrier layer having a compact smooth barrier surface. 11. The method of claim 8 wherein said barrier layer is predominantly selected from the group of collagen I, collagen III or a mixture thereof. 12. The method of claim 8 wherein said membrane comprises a matrix layer predominantly of Collagen II and having an open sponge-like texture applied to a soft fibrous layer of a collagen I/III membrane having a compact smooth barrier surface opposite said matrix layer. 13. The product claim 3 in which said pharmaceutically active substance is selected from the group consisting of bone morphogenetic proteins (BMPs), other skeletal matrix molecules, and signaling peptides. 14. The product of claim 13 wherein said pharmaceutically active is selected from the group consisting of BMP-2-8, TGF-β, TGF-β1, VEGF, IGF, PTHrP and PDGF. 15. The product of claim 3 further comprises isolated articular cartilage stem cells or bone stem cells. 16. The product of claim 1 wherein said collagen II fibers are derived from cartilage.