2386 results about "Moving bed" patented technology

The average propylene cycle yield of an oxygenate to propylene (OTP) process using a dual-function oxygenate conversion catalyst is substantially enhanced by the use of a combination of: 1) moving bed reactor technology in the catalytic OTP reaction step in lieu of the fixed bed technology of the prior art; 2) a separate heavy olefin interconversion step using moving bed technology and operating at an inlet temperature at least 15° C. higher than the maximum temperature utilized in the OTP reaction step; 3) C₂ olefin recycle to the OTP reaction step; and 4) a catalyst on-stream cycle time of 700 hours or less. These provisions hold the build-up of coke deposits on the catalyst to a level which does not substantially degrade dual-function catalyst activity, oxygenate conversion and propylene selectivity, thereby enabling maintenance of average propylene cycle yield for each cycle near or at essentially start-of-cycle levels.

Porous-material-supported polymer sorbents and process for removal of undesirable gases such as H₂S, COS, CO₂, N₂O, NO, NO₂, SO₂, SO₃, HCl, HF, HCN, NH₃, H₂O, C₂H₅OH, CH₃OH, HCHO, CHCl₃, CH₂Cl₂, CH₃Cl, CS₂, C₄H₄S, CH₃SH, and CH₃—S—CH₃ from various gas streams such as natural gas, coal/biomass gasification gas, biogas, landfill gas, coal mine gas, ammonia syngas, H₂ and oxo-syngas, Fe ore reduction gas, reformate gas, refinery process gases, indoor air, fuel cell anode fuel gas and cathode air are disclosed. The sorbents have numerous advantages such as high breakthrough capacity, high sorption/desorption rates, little or no corrosive effect and are easily regenerated. The sorbents may be prepared by loading H₂S—, COS—, CO₂—, N₂O, NO—, NO₂—, SO₂—, SO₃—, HCl—, HF—, HCN—, NH₃—, H₂O—, C₂H₅OH—, CH₃OH—, HCHO—, CHCl₃—, CH₂Cl₂—, CH₃Cl—, CS₂—, C₄H₄S—, CH₃SH—, CH₃—S—CH₃-philic polymer(s) or mixtures thereof, as well as any one or more of H₂S—, COS—, CO₂—, N₂O, NO—, NO₂—, SO₂—, SO₃—, HCl—, HF—, HCN—, NH₃—, H₂O—, C₂H₅OH—, CH₃OH—, HCHO—, CHCl₃—, CH₂Cl₂—, CH₃Cl—, CS₂—, C₄H₄S—, CH₃SH—, CH₃—S—CH₃-philic compound(s) or mixtures thereof on to porous materials such as mesoporous, microporous or macroporous materials. The sorbents may be employed in processes such as one-stage and multi-stage processes to remove and recover H₂S, COS, CO₂, N₂O, NO, NO₂, SO₂, SO₃, HCl, HF, HCN, NH₃, H₂O, C₂H₅OH, CH₃OH, HCHO, CHCl₃, CH₂Cl₂, CH₃Cl, CS₂, C₄H₄S, CH₃SH and CH₃—S—CH₃ from gas streams by use of, such as, fixed-bed sorbers, fluidized-bed sorbers, moving-bed sorbers, and rotating-bed sorbers.

The average propylene cycle selectivity of an oxygenate to propylene (OTP) process using a dual-function oxygenate conversion catalyst is substantially enhanced by the use of a combination of: 1) moving bed reactor technology in the hydrocarbon synthesis portion of the OTP flow scheme in lieu of the fixed bed technology of the prior art; 2) a hydrothermally stabilized and dual-functional catalyst system comprising a molecular sieve having dual-function capability dispersed in a phosphorus-modified alumina matrix containing labile phosphorus and/or aluminum anions; and 3) a catalyst on-stream cycle time of 400 hours or less. These provisions stabilize the catalyst against hydrothermal deactivation and hold the build-up of coke deposits on the catalyst to a level which does not substantially degrade dual-function catalyst activity, oxygenate conversion and propylene selectivity, thereby enabling maintenance of average propylene cycle yield near or at essentially start-of-cycle levels.

The invention relates to a catalyst for preparing olefin by dehydrogenating low-carbon alkane, and a preparation method and an application thereof, which belong to the technical field of the preparation of basic organic chemical raw materials. The catalyst is prepared by a dipping method of using an aluminium silicophosphate molecular sieve as a carrier, VIII group or VIB group elements as active constituents and IVA group elements as an auxiliary agent. In the process for preparing olefin by dehydrogenating low-carbon alkane, the catalyst is firstly reduced by hydrogen gas, then participates in a reaction, and is finally regenerated. Compared with the existing catalyst for preparing olefin by dehydrogenating low-carbon alkane, the catalyst has a pore shape selecting function and moderate acidity, thereby the selectivity of the low-carbon alkane can reach more than 90 percent in the process for preparing olefin by dehydrogenating low-carbon alkane. The preparation method of the catalyst is simple; the regeneration process flow of the reaction has a large choice, a fixed bed, a fluidized bed or a moving bed can be used as a reactor, and the catalyst can be regenerated in the reactor or outside the reactor.

The invention discloses a butt joint type operation patient transfer trolley and belongs to the technical field of medical apparatus. The butt joint type operation patient transfer trolley comprises a transverse moving bed and a transfer trolley. The transverse moving bed with a tiltable bed top is disposed on a transfer trolley plate of the transfer trolley and locked by a bed locking device. The transfer trolley comprises a transfer trolley body, a transfer trolley base and a lifting device. The transfer trolley body is supported on the transfer trolley base through the lifting device. The transverse moving bed mainly comprises a transverse moving bed frame, a bed board, an air cushion and rollers. Inflation of the air cushion enables the bed board to tilt. By the butt joint technology, an operation patient along with the moving bed is transferred from the transfer trolley outside an operating room to the transfer trolley in the operating room, cross infection is avoided, operating environments are kept clean, and operating safety is increased. By the moving bed with the tiltable bed top, the patient can be transferred from the operation patient transfer trolley to an operating table conveniently and time- and labor-savingly. The butt joint type operation patient transfer trolley is suitable for transferring seriously-injured patients from ambulances to operating rooms of hospitals.

The present invention relates to fume desulfurizing, denitrating and dedusting process in moving bed. During the reverse contact between fume and active coke, the fume first has its adsorbed SO2 eliminated in the desulfurizing layer and then has its NOx reacted with injected NH3 to produce N2, H2O and other harmful products. The active coke after finishing desulfurization and denitration is regenerated in a regenerator physically through heating to decompose and desorb sulfuric acid and sulfate and chemically through the reaction between the created SO3 and the inner surface of the active coke to produce surface functional group. Experiment shows that the technological scheme of the present invention has the advantages of simple process, high efficiency, low cost, low power consumption, low water consumption and other advantages.

Disclosed is a mixer-distributor-collector apparatus for use between beds of solid particles in a fluid-solid contacting vessel. The apparatus includes a solids retaining screen, fluid deflector, passageway, fluid distributor, and flow manipulator. The flow manipulator is a device such as a honeycomb, porous solid, perforated plate, screen, or grid having an open area greater than the open area of the fluid distributor and is located below and spaced apart from the fluid distributor. The apparatus improves the fluid flow characteristics by minimizing or eliminating fluid velocity jets and/or other turbulence which can disturb the downstream particle bed. In an exemplary application, the invention finds use in simulated moving bed (SMB) adsorptive separation processes.

The present invention relates to agglomerated zeolitic adsorbents based on zeolite X with an Si/Al ratio such that 1.15<Si/Al≦1.5, at least 90% of the exchangeable cationic sites of the zeolite X of which are occupied either by barium ions alone or by barium ions and potassium ions whose Dubinin volume is greater than or equal to 0.240 cm³/g.

They are obtained by agglomerating zeolite powder with a binder, followed by the zeolitization of the binder, the exchange of the ions of the zeolite by barium ions (and potassium ions) and the activation of the adsorbents thus exchanged.

These adsorbents are particularly suited to the adsorption of the para-xylene present in C₈ aromatic hydrocarbon fractions in the liquid phase in processes of simulated moving bed type but also to the separation of sugars, polyhydric alcohols, cresols or substituted toluene isomers.

The invention discloses a catalyst for manufacturing olefin by low-carbon alkane dehydrogenation and application thereof, belonging to the technical field of preparation of basic organic chemical materials. The catalyst takes silicoaluminophosphate molecular sieve and alumina mixture as carriers, VIII group or IVA group elements as active components and alkaline-earth metal or rare-earth elements as auxiliary agents for the process of olefin preparation by ethane, propane, butane or pentane dehydrogenation. In the process of olefin preparation by low-carbon alkane dehydrogenation, catalyst is firstly reduced by hydrogen and then reacts, and finally the catalyst is in charcoaling regeneration and chlorination update; and reaction regeneration process flow has big choice, the reactor can adopt a fixed bed, a moving bed, a fluidized bed or a double-particle fluidized bed, and catalyst regeneration can be carried out in a device or out of the device. Compared with the existing catalyst for manufacturing olefin by low-carbon alkane dehydrogenation, the catalyst provided by the invention ensures that low-carbon alkane selectivity is above 95% in the olefin preparing process by low-carbon alkane dehydrogenation under high conversion rate.

PCT No. PCT/SK97/00006 Sec. 371 Date Jun. 1, 1999 Sec. 102(e) Date Jun. 1, 1999 PCT Filed Jul. 4, 1997 PCT Pub. No. WO98/39368 PCT Pub. Date Sep. 11, 1998The nature of the process consists in that the low-grade organic substances are subject, at a temperature of 150 DEG C. to 700 DEG C. and at a pressure of 0.1 MPa to 2.5 MPa, to the action of a moving bed of solid particles of a substance which perform whirling motion, whereby the solid particles of a substance constituting the moving bed are set to whirling motion by intensive agitation. The device consists of a reaction chamber (1) with a rotation mechanism (2) which rotation mechanism (2), located rotably in the faces of the reaction chamber (1), consists of a shaft (3) to which vanes (5) are symetrically attached by means of driving discs (4). The vanes (5) may be arranged in 3 to 10 rows, and they may be provided with openings (5.1) or cut-outs (5.2) of various geometrical shapes, and they may be divided into individual segments (5.3). Also the driving discs (4) may be provided with openings (4.1) of various geometrical shapes.

Disclosed is a process for extracting xylose and xylitol from a xylose mother liquor or a xylose digest, which comprises, using xylose hydrolysate or xylose mother liquid as the raw material, removing glucose through saccharomyces cerevisiae fermentation, then imitating moving bed, using water as eluent, completely separating xylose from foreign matter such as arabinose, thus obtaining component containing rich xylose.

Free-flowing solid particles are dried in a moving bed dryer by passing the particles adjacent to a heat exchanger plate containing a heated fluid while passing a dehumidified gas into the solid particles from a gas flow manifold in the heat exchanger plate.

The invention relates to a method for preparing olefin by methanol or dimethyl ether, in particular to a high selectivity preparation method of propylene, which comprises a conversion reaction of methanol or dimethyl ether, alkylation of methanol and ethylene and a catalytic cracking reaction of a plurality of heavy components above C4. A hydrocarbon mixture rich in propylene is generated by preheated material contacting with a first catalyst in a circulating fluidized bed or a moving bed reactor. After the propylene is separated from the hydrocarbon mixture, a plurality of light components of the hydrocarbon mixture comprising hydrogen and methane return to a methanol conversion reactor, the propylene is generated by the alkylation of methanol and ethylene in the light components. The invention is characterized in that the C4 and the heavy components above C4 separated from separation system are contacted with cracking catalyst in the circulating fluidized bed, generating hydrocarbonmixture contained ethylene, propylene and other light components by the catalytic cracking reaction, then the hydrocarbon mixture returns to the separation system for obtaining propylene.

The invention provides a flue gas purification and sulphur recovery system and a process, comprising an adsorber, a desorber, an adsorbent delivery system, a heat energy integrated recovery system and a carbon powder separation and recovery system; meanwhile, suitable processing methods are adopted. The adsorber adopts a single-device dual-section radial staggered moving bed shaped like a reversed u and selective wide spectrum purification; the desorber adopts an axial reflux moving bed to realize the integrated recovery and utilization of the heat energy, regeneration of the adsorbent and the recovery of sulphur resource; the adsorbent adopts dense phase pneumatic conveying, thus leading the system to run continuously and stably; the flue gas purification and the sulphur recovery are realized by the carbon-based column-shaped or sphere-shaped desulfurization and denitration adsorbent. The system effectively integrates the energy-saving, exhaust and consumption reduction and resource recovery and utilization together, and has the advantages of high-effect wide spectrum purification and sulphur resource recovery, good gas distribution, grain movement and low pressure reduction, integrated recovery and utilization of heat energy, delivering the absorbent with no mechanical parts, continuous and stable operation of system, saving equipment investment and operation expense, etc.

Product purity from or capacity of a simulated-moving-bed adsorptive separation process is increased by flushing the contents of the transfer line previously used to remove the raffinate stream away from the adsorbent chamber, preferably into the raffinate column used to separate desorbent from raffinate product. Preferably a stream from the adsorbent chamber at an intermediate point between the feed entry point and raffinate withdrawal is used as the flushing liquid. This flush step eliminates the passage of a quantity of the raffinate material into the adsorbent chamber in the transfer-line flush period or when the process conduit is subsequently used to charge the feed stream to the adsorbent chamber.

A fixed-bed catalytic reformer unit is converted to moving bed reactor/cyclic regenerator operation by re-using the fixed bed reactors of the original unit as regenerator vessels operated in cyclic regeneration mode in a new catalyst regeneration section. A flow connection, suitably a liftpipe, is provided to convey spent catalyst from the spent catalyst outlet of a new moving bed reactor section to the converted regenerator section, together with a flow connection for regenerated catalyst from the regenerator section to the regenerated catalyst inlet of the new moving bed reactor section. A flow control distributor directs spent catalyst sequentially to each of the regenerator vessels to carry out the regeneration with regeneration gas. Each regenerator vessel is cycled through a fill, regeneration, discharge sequence to maintain a continuous flow of catalyst to and from the reactor section.

Systems and processes for the alkylation of a hydrocarbon are provided that utilize a plurality of moving bed radial flow reactors. An olefin injection point can be provided prior to each reactor by providing a mixer that mixes olefin with a hydrocarbon feed, or with the effluent stream from an upstream reactor, to produce a reactor feed stream. Catalyst can be provided from the reaction zone of one reactor to the reaction zone of a downstream reactor through catalyst transfer pipes, and can be regenerated after passing through the reaction zones of the reactors. The moving bed radial flow reactors can be stacked in one or more reactor stacks.

The invention discloses a method for treating coking wastewater, which belongs to the field of wastewater treatment. The method comprises the following steps that: wastewater of a coking plant enters a regulating reservoir for the adjustment of water quality and water amount, and orderly enters a hydrolytic tank, an anaerobic tank, a preaeration tank, a preliminary sedimentation tank, an aerobic tank, a secondary sedimentation tank and a coagulation reaction tank for treatment, wherein the hydrolytic tank and the preaeration tank are filled with a bio-cord filler; the sludge of the preliminary sedimentation tank refluxes into the hydrolytic tank and the anaerobic tank respectively; a clarifying solution of the secondary sedimentation tank refluxes into the anaerobic tank; and the aerobic tank adopts a moving bed bio-film reactor. The bio-cord filler adopted in the invention has short film formation time and high biomass, does not need repeated washing, and has strong shock resistance; and the moving bed bio-film reactor can fix a large amount of nitrobacteria with long generation time, and has no the problem of blocking. The method can remove high-concentration ammonia nitrogen and organic substances in the coking wastewater, and the COD and the ammonia nitrogen of treated effluent can synchronously achieve the primary standard of the national integrated wastewater discharge standard (GB9878-1996).