Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve passing streams through adsorbent bed units to treat the pipeline quality natural gas to form a stream that complies with liquefied natural gas (LNG) specifications. The process may involve a combined TSA and PSA process, which is utilized to remove contaminants from the feed stream.

Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve passing streams through adsorbent bed units to treat the feed stream to form a stream that complies with nitrogen rejection specifications. The process may involve using at least a portion of the nitrogen rejection process product streams as a purge for the swing adsorption process.

An adjustable flow control device is provided which has a valve body containing a series of orifices of varying diameter and an indexable valve cover which includes at least one flow conduit which can be positioned and locked in a sealable manner over a chosen orifice while the remaining part of the valve cover closes off the other orifices of the valve body. Due to the device having fixed size orifices, each orifice will provide a fixed specific fluid flow rate for any predetermined pressure loss across the orifice. The device is suitable for use on all types of gas and liquid fluids.

A pressure swing adsorption (PSA) system for purifying a feed gas is provided. The PSA system may have a first adsorber bed and a second adsorber bed, each having a feed port, a product port, and adsorbent material designed to adsorb one or more impurities from the feed gas to produce a product gas. The PSA system may also have a network of piping configured to direct the feed gas to the feed ports of the adsorber beds and direct the product gas to and from the product ports of the adsorber beds. The network of piping may also be configured to transfer gas between the first adsorber bed and the second adsorber bed during a pressure equalization step and a purge step. The PSA system may also have a first valve configured to direct flows of the feed gas and the product gas through the network of piping. The PSA system may further have a first orifice configured to regulate a flow rate of gas between the first adsorber bed and the second adsorber bed during at least one of the pressure equalization step and the purge step.

A pressure swing adsorption process (PSA) comprising the following steps: feeding an input gas containing H.sub.2, CO.sub.2 and impurities through a CO.sub.2 adsorbent material in a pressure vessel under a high pressure; withdrawing a first H.sub.2-rich product gas due to adsorption of CO.sub.2 in the adsorbent material; setting the pressure to an intermediate pressure causing the adsorbent material to release a second gas stream; passing a CO.sub.2-rich purge stream through the adsorbent material, obtaining a purge gas; setting the pressure to a sub-atmospheric low pressure, so that a CO.sub.2-rich product gas is released under vacuum by the adsorbent material; re-pressurizing the vessel to said high pressure; said steps being performed cyclically in a pressure vessel or in a plurality of parallel pressure vessels of a multiple vessel setup.

Processes and apparatuses for reducing molecular weight fluctuation in a tail gas stream from a pressure swing adsorption process. Multiple PSA separation zone are synchronized such that when one of the PSA units is generating a low molecular weight tail gas, there is another PSA unit generating a high molecular weight tail gas.

A preparative chromatograph system (1) includes a fractionation collecting condition correction part (18) configured to detect a change in a chromatogram acquired in each of a plurality of injections of a sample during stack injection fractionation collecting and to correct a fractionation collecting condition during the stack injection fractionation collecting so that the chromatogram approaches a state before the change, wherein the stack injection fractionation collecting continues based on the corrected fractionation collecting condition after the fractionation collecting condition correction part (18) has corrected the fractionation collecting condition.

According to one aspect of the present invention, a pressure swing adsorption (PSA) device includes an adsorption tower configured to introduce hydrogen gas and adsorb impurity components in the hydrogen gas by using a pressure swing adsorption (PSA) method, an adsorbent of one layer made of activated carbon or an adsorbent of two layers in which activated carbon and zeolite are stacked being disposed in the adsorption tower, the hydrogen gas containing carbon monoxide (CO) of 0.5 vol % or more and 6.0 vol % or less and methane (CH.sub.4) of 0.4 vol % or more and 10 vol % or less as the impurity components; and a densitometer configured to detect a concentration of CO in the hydrogen gas discharged from the adsorption tower, wherein the impurity components are adsorbed and removed to cause the CO concentration measured by the densitometer to fall below a threshold.

A concentration measurement method for measuring a carbon dioxide concentration of a desorption gas containing carbon dioxide desorbed from an adsorbent which has adsorbed carbon dioxide contained in a target gas. The method includes a first processing of detecting a flow rate and a carbon dioxide concentration of the target gas; a second processing of detecting a flow rate and a carbon dioxide concentration of a residual gas resulting from adsorption of carbon dioxide contained in the target gas by the adsorbent; and a calculation processing of determining the carbon dioxide concentration of the desorption gas on the basis of the results of the first processing and the second processing.

A pressure swing adsorption (PSA) device includes an adsorption tower configured to introduce hydrogen gas and adsorb impurity components in the hydrogen gas by using a pressure swing adsorption (PSA) method, an adsorbent of one layer made of activated carbon or an adsorbent of two layers in which activated carbon and zeolite are stacked being disposed in the adsorption tower, the hydrogen gas containing carbon monoxide (CO) of 0.5 vol % or more and 6.0 vol % or less and methane (CH.sub.4) of 0.4 vol % or more and 10 vol % or less as the impurity components; and a densitometer configured to detect a concentration of CO in the hydrogen gas discharged from the adsorption tower, wherein the impurity components are adsorbed and removed to cause the CO concentration measured by the densitometer to fall below a threshold.