1
Melvyn Duckett, David I Limb: Recovery of carbon dioxide from gas mixture. Costain Petrocarbon, Browdy and Neimark, January 27, 1987: US04639257 (83 worldwide citation)

Carbon dioxide is recovered from gas mixtures containing it in a concentration not greater than the equilibrium concentration at the freezing temperature of the mixture, by subjecting the gas mixture to membrane separation and recovering from the membrane separation a permeate having a carbon dioxid ...


2
Bogdan A Czarnecki, David I Limb: Purification of helium. Costain Petrocarbon, Browdy and Neimark, June 23, 1987: US04675030 (34 worldwide citation)

Helium contaminated with minor amounts of air, water vapor and carbon dioxide and from an envelope (10) is compressed in a compressor (12) and thereafter cooled in cooler (18) and fed via water separator (20) to a first of two substantially helium-permeable, oxygen/nitrogen-impermeable membranes (28 ...


3
Duckett Melvyn, Limb David Ian: Process for recovering carbon dioxide. Costain Petrocarbon, November 5, 1986: GB2174379-A (18 worldwide citation)

A process for recovering carbon dioxide from a gas mixture containing it in a concentration of at least about 40%, wherein the gas mixture is distilled at superatmospheric pressure and subambient temperature to yield substantially pure carbon dioxide as a liquid bottoms product, the distillation ove ...


4
Ronald D Openshaw: Production of pure nitrogen. Costain Petrocarbon, Birch Stewart Kolasch & Birch, January 28, 1986: US04566887 (17 worldwide citation)

A process and apparatus for the production of nitrogen from air by the cryogenic fractionation of the air at superatmospheric pressure and which permits the production of variable quantities of nitrogen from a constant supply of air at superatmospheric pressure by periodically distilling less than a ...


5
Terence R Tomlinson, Bogdan Czarnecki: Separation of hydrocarbon mixtures. Costain Petrocarbon, Browdy and Neimark, July 11, 1989: US04846863 (12 worldwide citation)

In the method of separating a methane-containing light gas from a feed gas containing heavier hydrocarbons by (i) cooling the feed gas at superatmospheric pressure to partially condense it, (ii) separating a first condensate from the uncondensed gas, (iii) rectifying the uncondensed gas to produce t ...


6
Tomlinson Terence Ronald, Cummings Donald Ray: Heat exchanger.. Costain Petrocarbon, Dut, September 25, 1985: EP0155772-A1 (2 worldwide citation)

The tendency towards the disadvantageous phenomenon known as flooding in refluxing heat exchangers of the so-called plate-fin kind is reduced or avoided by providing at least some of the primary passages with means such as a surface extending downwardly from the bottom of the passage for lowering th ...


7
Tomlinson Terence Ronald, Czarnecki Bogdan: -Separation of hydrocarbon mixtures. Costain Petrocarbon, September 1, 1988: GB2201501-A (1 worldwide citation)

In, the method of separating a methane-containing light gas from a feed gas 11 containing heavier hydrocarbons by (i) cooling the feed gas at superatmospheric pressure in heat exchanger 20 to partially condense it, (ii) separating a first condensate from the uncondensed gas in a separator 21, (iii) ...


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9
Jones David Andrew, Limb David Ian: Separation of hydrocarbon mixtures. Costain Petrocarbon, December 21, 1988: GB2205933-A

In the process for the recovery of e.g. NGL or LPG and light gas from a gaseous hydrocarbon feed 11, it is found that where a large throughput is desired, a capital cost- and weight-effective alternative to the use of a refluxing heat exchanger involves cooling the feed gas in a heat exchanger 1 at ...