Abstract:
A fuel processing reactor is provided, comprising a shift catalyst bed disposed in a shell and tube reactor. The thermal stress on the present reactor during normal operation is reduced by cooling/heating both the shell and the tubes in the reactor. The present reactor may further comprise other beds such as hydrodesulfurizer catalyst beds, metal oxide beds, or sulfur polisher beds.
Abstract:
In a process for the production of urea, substantially pure ammonia and carbon dioxide are reacted in a reaction space (1) from which comes out a reaction mixture subjected to stripping (2) to obtain a partially purified mixture sent to a urea recovery section (3, 4, 7, 8). From the recovery section (3, 4, 7, 8) it is obtained a dilute carbamate solution, which is subjected to stripping (9) with recycling of vapors to the reaction space (1) after condensation (6). This process achieves high conversion yield with reduced energy consumption and low implementation costs.
Abstract:
A process and a system for increasing para-xylene production from a C8 aromatic feedstream by coupling at least one xylene isomerization reactor with at least one pressure swing adsorption unit or temperature swing absorption unit to produce a product having a super-equilibrium para-xylene concentration. This product is then subjected to para-xylene separation and purification.
Abstract:
The present invention provides apparatus and a process capable of reducing the sulphur content of the gasoline product resulting from the cracking of a high molecular weight hydrocarbon feed comprising sulphur which comprises at least three concurrent steps: (a) passing input fluid comprising pollutant through at least one adsorber to produce a polluted adsorber and a purified fluid stream (of reduced pollutant content), which leaves the adsorber, stopping the flow into said adsorber to leave residual fluid therein, and separating said residual fluid from said adsorber to leave the polluted adsorber of reduced residual fluid content, (0) heating a polluted adsorber with a heated regeneration gas to produce a hot adsorher (of reduced polutant content) and cooler regeneration gas (of increased pollutant content), (c) contacting a heated adsorher (of reduced pollutant content) with a regeneration gas (of a lower temperature than that of said adsorber) to produce a cooler adsorber and a warmer regeneration gas, which gas is further heated to produce said heated regeneration gas which is passed to step (0), said process comprising at least 3 adsorbers, at least one of which is being subjected to step (a), at least one different adsorher to step (0) and at least one further different adsorber being subjected to step (c), and after completion of one, step the adsorber produced is subjected to the next step in the cyclic sequence (a)-b)-(c)(a).
Abstract:
A multi-stage preferential oxidation reactor for removing carbon-monoxide from a product-gas comprises at least one preferential oxidation reactor stage having a product-gas stream inlet end and a product-gas stream outlet end. A first inlet is provided to introduce the product-gas stream into the preferential oxidation reactor stage, and is located at the product-gas stream inlet end of the preferential oxidation reactor stage. The first inlet is configured with a pulsator for pulsing the flow of the product-gas stream into the preferential oxidation reactor stage. A second inlet is also provided to introduce an oxidant into the preferential oxidation reactor stage. The second inlet is located at the product-gas stream inlet end of the oxidizer preferential oxidation reactor stage. An outlet is provided for removal of the treated product-gas stream from the preferential oxidation reactor stage.
Abstract:
An automatic DNA fragment removing method aims at removing a vector unit base sequence, that is, a base sequence in a portion of a vector, with precision from the DNA integrated into the vector and processed in a cloning process, so as to obtain a target DNA fragment in an exact structure. Depending on the vector and the restriction enzyme used for cleaving the vector and generating an object DNA fragment, a retrieval key is generated to retrieve a vector unit from the DNA base sequence obtained as the cloning process. Using the generated retrieval key, the junction between the DNA fragment and the vector unit is specified, and the specified junction and the base sequence outside the junction are automatically removed as the vector unit.
Abstract:
An adsorbent-catalyst for removal of sulphur compounds from sulfur compound contaminated gas and liquid feed streams, wherein the adsorbent-catalyst is a synthetic X or Y faujasite with a silica to alumina ratio from 1.8:1 to about 5:1 and wherein 40 to 90% of the cations of the faujasite include transition metals of Groups IB, IIB and VIIB with the balance of the cations being alkali or alkaline earth metals.
Abstract:
Disclosed are apparatus and methods for conversion of hydrocarbon feed streams into liquid products. One embodiment of an apparatus includes a pressure vessel that contains a synthesis gas production device, a synthesis gas conditioning device and a synthesis gas conversion device wherein the synthesis gas production device and the synthesis gas conditioning device are nested within the synthesis gas conversion device. One embodiment of a method includes providing a hydrocarbon feed stream and producing a synthesis gas stream from the hydrocarbon feed stream in a synthesis gas production device. Subsequently, the synthesis gas stream is conditioned by removing heat from the synthesis gas stream through a first hollow body into a reactant feed stream that is then fed into the synthesis gas production device. Finally, the synthesis gas stream is converted to form a liquid product stream.
Abstract:
A device for treating a medium in a fuel cell system has a reactor with a catalyst-containing region between a first part-chamber of the reactor and a second part-chamber of the reactor. The catalyst-containing region is arranged in the flow path of the medium, so that the medium flows through it. The first part-chamber is surrounded at least partially by the second part-chamber, and the catalyst-containing region is arranged as a partition between the first, inner part-chamber and the second, outer part-chamber. The partition is formed by a nonwoven provided with catalyst material.
Abstract:
A closed loop continuous emulsion polymerization apparatus at least comprising a circulation pump, a reactor tube which connects the outlet of the circulation pump to its inlet, at least one feed for supplying raw materials, an outlet, and means for cooling the tube, characterized in that the reactor further comprises an additional tube for by-passing a pig around the circulation pump, a pig receiving station which is in parallel connection with the circulation pump or the reactor tube, and optionally means for directing a pig into the pig receiving station. The invention allows simple removal of the pig from the reactor, afforts great freedom in selecting the type of circulation pump and material and shape of the pig, and enables total control over the launching of the pig substantially independent of the reaction medium flow.