Abstract: A fluidized bed reactor, a device, and a method for producing low-carbon olefins from oxygen-containing compound are provided. The fluidized bed reactor includes a reactor shell, a reaction zone, a coke control zone and a delivery pipe, where there are n baffles arranged in the coke control zone, and the n baffles divide the coke control zone into n sub-coke control zones which include a first sub-coke control zone, a second sub-coke control zone, and an nth sub-coke control zone; at least one catalyst circulation hole is provided on each of the n-1 baffles, so that the catalyst flows in an annular shape in the coke control zone, where n is an integer. The device and method can be adapted to a new generation of DMTO catalyst, and the unit consumption of production ranges from 2.50 to 2.58 tons of methanol/ton of low-carbon olefins.

Abstract: A method for preparing a methyl ester compound is provided, including: subjecting a raw material of a carboxyl compound, methanol and/or dimethyl ether to an esterification reaction to obtain the methyl ester compound, where the general formula I of the carboxyl compound is R—CH2—COOH, where R is a methoxy or hydroxyl; and the methyl ester compound comprises at least one of methyl methoxyacetate and methyl glycolate. This application also discloses a method for preparing a methyl glycolate, comprising the steps of: a) subjecting methylal and carbon monoxide to a carbonylation reaction to obtain methyl methoxyacetate; b) subjecting the methyl methoxyacetate and water to a hydrolysis reaction to obtain the methyl glycolate; and c) subjecting glycolic acid, methoxyacetic acid, methanol, and dimethyl ether to an esterification reaction to obtain the methyl glycolate.

Abstract: Disclosed by the present application is a method for producing methyl acetate by means of the carbonylation of dimethyl ether. The method comprises: passing dimethyl ether and a feed gas comprising carbon monoxide through a reactor loaded with a solid acid catalyst for reaction so as to produce methyl acetate, the molar ratio of carbon monoxide to dimethyl ether being 0.05:1-0.5:1. The described method has the advantages of a low molar ratio of carbon monoxide to dimethy1 ether, a high conversion rate of carbon monoxide, a small gas circulation amount, low operation costs and so on.

Abstract: A method for preparing a modified molecular sieve catalyst and a method for producing benzene, toluene and p-xylene by coupling conversion of naphtha and CO2 are provided. Preparing a modified molecular sieve catalyst includes subjecting a molecular sieve to metal modification by using a high temperature hydrothermal method, which includes: (1) preparing a soluble metal salt aqueous solution; (2) placing a zeolite molecular sieve to be metal-modified in the soluble metal salt aqueous solution, and impregnating the same at a temperature of 60-100° C.; and (3) draining the molecular sieve, followed by drying and calcination. Producing benzene, toluene and p-xylene by coupling conversion of naphtha and CO2 includes: (a) preparing a modified molecular sieve catalyst; and (b) enabling a raw material containing naphtha and CO2 to contact with the modified molecular sieve catalyst in a reactor for a reaction to produce benzene, toluene and p-xylene.

Abstract: The present disclosure includes a system for producing low carbon olefins and/or aromatics from raw material comprising naphtha. The system can include a reaction unit that includes a fast fluidized bed reactor, a stripping unit that includes a stripper, and a regeneration unit. The reactor unit is adapted to allow the catalytic cracking of naphtha and to output reaction unit effluent material (spent catalyst and product gas) into the stripping unit, which is adapted to output product gas. The stripping unit is connected to and in fluid communication with the regeneration unit such that the stripping unit supplies the spent catalyst from the reaction unit to regeneration unit. The regeneration unit is adapted to regenerate the spent catalyst to form regenerated catalyst. The regeneration unit is connected to and in fluid communication with the fast fluidized bed reactor such that, in operation, regenerated catalyst can be sent to the fast fluidized bed reactor of the reaction unit.

Abstract: A commutator on-off detection mechanism with a self-checking function and a detection method thereof are provided, the commutator on-off detection mechanism includes an upper detection module and a lower detection module disposed directly below the upper detection module, the upper detection module is provided with upper resilient sheets, the lower detection module is provided with lower resilient sheets, and numbers of the upper resilient sheets and lower resilient sheets are equal. The upper detection module is configured to press a commutator downwards until the commutator is snapped into the lower detection module, thereby to make the commutator be in contact with the lower resilient sheets of the lower detection module, and the upper detection module is further configured to make the upper resilient sheets be in contact with the commutator. The device has high detection efficiency, does not require frequent replacement of accessories, and there will be no leakage or wrong detection.

Abstract: A method for preparing p-xylene is provided. Raw materials containing methanol, naphtha and CO2 are introduced into a reactor filled with a catalyst for a reaction to produce p-xylene. By adding the methanol, the product distribution is adjusted, and the selectivity of p-xylene is obviously improved. In addition, components containing benzene and toluene in aromatic hydrocarbon products are returned to a reaction system and co-fed with the raw materials for a reaction to produce p-xylene, so that cyclic utilization of the raw materials is achieved, and the method has extremely high economic benefits. The method has a simple process and high feasibility, can greatly improve the selectivity and yield of p-xylene, has an important application value, and provides a new way for large-scale utilization of CO2.

Abstract: The present application discloses a method for preparing polyester polyol comprising performing transesterification of raw materials containing inorganic oxyacid ester and polyhydric alcohol to obtain the polyester polyol. The polyester polyol obtained by the method described in the present application has higher heat resistance.

Abstract: Provided are a molecular sieve catalyst, a preparation method therefor, an application thereof. The molecular sieve catalyst contains a modified Na-MOR molecular sieve, and the modification comprises: organic ammonium salt exchange, dealumination treatment, and ammonium ion exchange. The catalyst obtained by the method is used in dimethyl ether for one-step production of methyl acetate. The catalyst has high activity and stable performance, and the needs of industrial production can be satisfied.

Abstract: The present disclosure relates to a micro magnetic-hydraulic suspension centrifugal blood pump, which is a pump and motor integrated device. The blood pump includes a pump housing, a rotor, an impeller, a servo motor, an inner magnetic core group, an outer magnetic ring group, a limiting device, and a suture snap ring device; the rotor and the impeller are seamlessly connected into a whole; the rotor is arranged in an inner pipe of the blood pump; the servo motor drives the rotor to drive the impeller to do work; the inner magnetic core group is arranged at a lower end inside the rotor; the outer magnetic ring group and a wrapping sleeve are upright in a pump cavity lower shell; an inner and outer magnetic combination can achieve a radial magnetic suspension effect of the impeller; a ceramic sheet and a ceramic cone form a temporary limiting bearing; a top end of a vane of the impeller is provided with an inclined surface; and the pump can generate hydraulic suspension during working.

Abstract: Disclosed is a method for partially regenerating a catalyst for methanol and/or dimethyl ether-to-olefin. The method comprises: introducing a mixed gas into a regenerated region containing a catalyst to be regenerated, and subjecting same to a partial regeneration reaction to obtain a regenerated catalyst, wherein the mixed gas contains water vapor and air; and in the regenerated catalyst, the coke content of at least part of the regenerated catalyst is greater than 1%. The method utilizes the coupling of a mixed gas of water vapor and air to activate a deactivated catalyst, selectively eliminate part of a coke deposit in the catalyst to be regenerated, and obtain a partially regenerated catalyst for methanol-to-olefin. Another aspect of the present invention is that further provided is a method for methanol and/or dimethyl ether-to-olefin by using the partially regenerated catalyst for methanol-to-olefin regenerated by means of the method.

Abstract: A method for preparing glycolic acid through hydrolysis of alkoxyacetate is provided. The method includes: subjecting raw materials including the alkoxyacetate and water to a reaction in the presence of an acidic molecular sieve catalyst to produce the glycolic acid, where the alkoxyacetate is at least one selected from the group consisting of compounds with a structural formula shown in formula I; and in formula I, R1 and R2 each are independently any one selected from the group consisting of C1-C5 alkyl groups. The glycolic acid production method in the present application can be implemented by a traditional fixed-bed reactor under an atmospheric pressure, which is very suitable for continuous production.

Abstract: A method for preparing glycolic acid and methyl glycolate through hydrolysis of methyl methoxyacetate and methoxyacetic acid is provided. The method includes allowing raw materials including methyl methoxyacetate, methoxyacetic acid, and water to contact and react with a catalyst to produce glycolic acid and methyl glycolate, where the catalyst is at least one selected from the group consisting of a solid acid catalyst, a liquid acid catalyst, a solid base catalyst, and a liquid base catalyst. The method for preparing glycolic acid and methyl glycolate in the present application can be implemented by a traditional fixed-bed reactor, tank reactor, or catalytic distillation reactor under an atmospheric pressure, which is very suitable for continuous production.

Abstract: The present disclosure relates to a micro magnetic-hydraulic suspension centrifugal blood pump, which is a pump and motor integrated device. The blood pump includes a pump housing, a rotor, an impeller, a servo motor, an inner magnetic core group, an outer magnetic ring group, a limiting device, and a suture snap ring device; the rotor and the impeller are seamlessly connected into a whole; the rotor is arranged in an inner pipe of the blood pump; the servo motor drives the rotor to drive the impeller to do work; the inner magnetic core group is arranged at a lower end inside the rotor; the outer magnetic ring group and a wrapping sleeve are upright in a pump cavity lower shell; an inner and outer magnetic combination can achieve a radial magnetic suspension effect of the impeller; a ceramic sheet and a ceramic cone form a temporary limiting bearing; a top end of a vane of the impeller is provided with an inclined surface; and the pump can generate hydraulic suspension during working.

Abstract: A fluidized bed reactor includes a main shell and a coke control zone shell; the main shell includes an upper shell and a lower shell; the upper shell encloses a gas-solid separation zone, and the lower shell encloses a reaction zone; the reaction zone axially communicates with the gas-solid separation zone; the coke control zone shell is circumferentially arranged on an outer wall of the main shell; the coke control zone shell and the main shell enclose an annular cavity, and the annular cavity is a coke control zone; n baffles are radially arranged in the coke control zone, and the n baffles divide the coke control zone into n coke control zone subzones, where n is an integer; the coke control zone subzones are provided with a coke control raw material inlet; and a catalyst circulation hole is formed in each of n?1 of the baffles.

Abstract: A coke control reactor, and a device and method for preparing low-carbon olefins from an oxygen-containing compound are provided. The coke control reactor includes a coke control reactor shell, a reaction zone I, and a coke controlled catalyst settling zone; a cross-sectional area at any position of the reaction zone I is less than that of the coke controlled catalyst settling zone; n baffles are arranged in a vertical direction in the reaction zone I; the n baffles divide the reaction zone I into m reaction zone I subzones; and a catalyst circulation hole is formed in each of the baffles, such that a catalyst flows in the reaction zone I in a preset manner. A catalyst charge in the present coke control reactor can be automatically adjusted, and an average residence time of a catalyst in the coke control reactor can be controlled by changing process operating conditions.

Abstract: An adsorbent and a use thereof are provided. The adsorbent is a metal-organic framework (MOF) MIL-125; the MOF MIL-125 has an external specific surface area (SSA) of 160 m2/g to 220 m2/g; and the MOF MIL-125 includes a micropore with an area of 1,000 m2/g to 1,500 m2/g. The external SSA of the MOF MIL-125 is much higher than an external SSA of the traditional MIL-125, which has promising application prospects in the adsorptive separation of xylene isomers and exhibits high selectivity for p-xylene.

Abstract: A metal-organic framework (MOF) MIL-125 and a preparation method and a use thereof are provided. The MOF MIL-125 is a round cake-like crystal and has an external specific surface area (SSA) of 160 m2/g to 220 m2/g. The MOF MIL-125 provided in the present application has a large number of microporous structures, a large external SSA, and a high catalytic activity in oxidation.

Abstract: A preparation method of a porous oxide is provided, which includes: preparing the porous oxide with a polyester polyol as a raw material. The porous oxide prepared by the preparation method in the present application has characteristics such as uniform and adjustable pore sizes and controllable distribution of mesopores, micropores, and macropores.

Abstract: The present application discloses a molecular sieve-based catalyst modification apparatus. The apparatus comprises a feed unit 1, a modification unit 2 and a cooling unit 3 connected in sequence; the feed unit comprises a catalyst feed unit 11 and a modifier feed unit 12, a catalyst and a modifier are introduced into the modification unit 2 respectively by the catalyst feed unit and the modifier feed unit and are discharged from the modification unit after sufficient reaction in modification unit, and then enter the cooling unit 3 for cooling. The present application further discloses a use method for the molecular sieve-based catalyst modification apparatus. The use method comprises: introducing a catalyst and a modifier into the modification unit 2 respectively through the feed unit 1; wherein the catalyst is modified by the modifier in the modification unit 2, and then discharged to the cooling unit 3 to cool until the temperature is lower than 50° C.