The invention relates to mixtures comprising molecular hydrogen, hydrocarbons, and nitrogen oxides; to processes for removing at least a portion of the nitrogen oxides therefrom; to equipment useful in such processes; and to the use of such hydrocarbons for, e.g., chemical manufacturing.

A volatile liquid vapor recovery system is used to recover vapors produced in the loading of shipping vehicles with volatile liquid product from a storage tank. The recovery system uses a primary vessel with an adsorption bed for adsorbing the volatile liquid vapors and venting clean air including oxygen to the atmosphere. The recovery system regenerates the adsorption bed by recovering the volatile liquid vapors from the adsorption bed and directly delivering said vapors to the storage tank. The system may be adapted to remove oxygen from the primary vessel prior to regeneration, such as by purging and venting the primary vessel with a purge gas or by providing a secondary vessel to receive oxygen and vapors from the primary vessel prior to regeneration of the first adsorption bed. Adsorbed volatile liquid vapor from the secondary vessel can be recycled to the primary vessel for conservation.

The present invention relates to a method and system for improving VPSA plant energy and capital efficiency through optimizing direct drive variable speed centrifugal feed, vacuum, and/or product compressors to achieve lower unit gas product production cost. More specifically, the present invention relates to a new energy efficient VPSA process and system which employs high speed direct drive centrifugal compressors to achieve wider production range. Significant lower energy consumption can be achieved over the plant operation life by employing compressors sized with average ambient and production demand, utilizing direct drive variable high speed centrifugal compressors' speed and operating range to meet the desired production demand. Since majority of the plants tend to run at below peak production most of operating life of the plant. In addition, the smaller size machine offers plant capital savings from the initial investment.

A vehicle air purification system includes a first heating device (130-1), a first adsorption block (140-1), and a first flow path switching mechanism (150-1). The vehicle air purification system includes a first flow path configured to communicate with a vehicle cabin, a second heating device (130-2), a second adsorption block (140-2), and a second flow path switching mechanism (150-2). The vehicle air purification system includes a second flow path configured to communicate with the vehicle cabin, a blower (110) configured to circulate air from the vehicle cabin, an air distribution mechanism (120) configured to distribute air flowing from the vehicle cabin to the first flow path and the second flow path, and a control device (20). The control device (20) controls components at a timing when the flow of the air from a flow path of a side on which purification target substances are being desorbed to the vehicle cabin is able to be limited when the flow path is switched between a flow path along which the air that has passed through a first adsorption block flows and a flow path along which the air that has passed through a second adsorption block flows.

A radial flow adsorption vessel comprising a cylindrical outer shell having a top end and a bottom end, the top end is enclosed by a vessel head that provides a centrical opening usable as a port to introduce or remove adsorbent particles into or from the vessel; at least one annular adsorption space disposed inside the shell, the at least one annular adsorption space defined by an outer and inner cylindrical porous wall, both co-axially disposed inside the shell; and a loading device for the adsorbent particles positioned above the at least one annular adsorption space at the top end of the vessel, the loading device comprises at least one conical element that extends radially to the outer cylindrical porous wall, the at least one conical element provides a plurality of orifices arranged at least in a region sitting above the at least one annular adsorption space.

An evaporated fuel treatment device includes a main adsorption chamber and a sub adsorption chamber. The sub adsorption chamber includes a first adsorption layer, a second adsorption layer and a high-desorption layer. The second adsorption layer is situated closer to an atmosphere port than the first adsorption layer is, and has a lower performance of adsorbing fuel vapor than the first adsorption layer does. The high-desorption layer is situated closer to the main adsorption chamber than the first adsorption layer is, and a higher performance of desorbing the fuel vapor than the first adsorption layer or the second adsorption layer does.

An air purification device includes an adsorption block, a housing, an introduction port for indoor air, an introduction port for heated air, a return port for indoor air, and a discharge port for used regeneration air. The adsorption block adsorbs purification target substances in indoor air, and is regenerated by dispersing the adsorbed purification target substances by circulating heated air. The housing accommodates the adsorption block therein. The introduction port for indoor air and the introduction port for heated air are provided on one end side of the housing. The return port for indoor air and the discharge port for used regeneration air are provided on the other end side of the housing. An insulating layer is provided between the housing and an outer surface of the adsorption block.

Drying device for drying compressed gas which includes at least two vessels with regenerable desiccant and an adjustable valve system which is such that a vessel can dry compressed gas, while the other vessel is being regenerated, whereby by regulating the valve system, the vessels can each in turn dry gas. The drying device includes a regeneration pipe for supplying a regeneration gas which runs from an outlet for dried gas to the valve system, and in which heating means are provided, whereby the drying device is provided with a return pipe for returning the regeneration gas to an inlet, running from the valve system to an inlet pipe which connects to said inlet and in which a venturi ejector is mounted, to which said return pipe is connected, and that regulating means are provided for regulating the flow of gas going through the venturi ejector.

In order to limit exposure of a fan (50) and of eventually other internal components to oxidizing species induced by the operation of an ozone generator (70), a gas treatment system (10) of the type operating alternately in treatment mode and in regeneration mode comprises two adsorption devices (60, 80) which are arranged respectively upstream and downstream of the ozone generator.

A system and method of pre-purification of a feed gas stream is provided that is particularly suitable for pre-purification of a feed air stream in cryogenic air separation unit. The disclosed pre-purification systems and methods are configured to remove substantially all of the hydrogen, carbon monoxide, water, and carbon dioxide impurities from a feed air stream and is particularly suitable for use in a high purity or ultra-high purity nitrogen plant. The pre-purification systems and methods preferably employ two or more separate layers of hopcalite catalyst with the successive layers of the hopcalite separated by a zeolite adsorbent layer that removes water and carbon dioxide produced in the hopcalite layers. Alternatively, the pre-purification systems and methods employ a hopcalite catalyst layer and a noble metal catalyst layer separated by a zeolite adsorbent layer that removes water and carbon dioxide produced in the hopcalite layer.