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: An aqueous iodine-based battery based on multi-electron transfer includes a positive electrode, a negative electrode, a current collector, an electrolyte, and a separator. A porous carbon felt is used as the electrode material on both sides of the positive and negative electrodes, and a polymer film is used as the membrane material. Both the positive and negative electrolytes are stored in the porous carbon felt electrodes. Both the positive and negative electrolytes are acidic mixed solutions containing I? and Cd?; during charging, I? at the positive electrode is charged to Cd(IO3)2, which realizes a electrochemical reaction of six-electron transfer, and the negative electrode involves the deposition of Cd? as a Cd metal; and the process is reversed during discharging. In order to improve the kinetics and reversibility of the multi-electron transfer process, additional additives are added to the solution to improve the electrochemical reversibility of the overall reaction.

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: An amine-bromine two electron electrolyte of flow battery and the use thereof, and a flow battery are provided. In the electrolyte, an amino compound with an electron-withdrawing group at the ortho-position of an amino group is used to react with bromine charged to a positive valence so as to form an amine-bromine compound, such that positive-valence bromine is stabilized, and a reversible two-electron transfer reaction from bromine ions to amino compounds is achieved. The amine compounds have different solubilities and produce different voltages depending on their substituent groups, and thus have extensive adjustability and applicability for use in acidic, neutral, and weak alkaline flow battery systems. Flow batteries assembled with the electrolyte prepared using this reaction has the advantages of low cost and high energy density, and can achieve a longer cycle life and higher battery efficiency.

Abstract: A roll-to-roll continuous coater for CCM preparation, and a coiled material connection method are provided. The coater has a coiled material connection mechanism that includes an upper rack (2) and a lower rack (3). A vacuum suction plate I (2-3) provided with a driving device for achieving displacement and a vacuum suction plate II (3-1) provided with a solid glue spraying device (3-3) are respectively disposed on the bottom of the upper rack (2) and the top of the lower rack (3). An optical fiber sensor I (2-4) and an optical fiber sensor II (3-2) are respectively disposed in the vacuum suction plate I (2-3) and the vacuum suction plate II (3-1). A tension detection device (4) is disposed between the lower rack (3) and a driving roller assembly (1).

Abstract: An electrode material of a fibrous structure has a platinum-based electrocatalytic material, an electrospinning polymer material, and an oxide material and/or one or more organophosphorus acid material with ion conduction. In the micromorphology has the structure of nanofibers, but also has porous morphological characteristics, the electrode material of this structure is prepared by electrostatic spinning technology, can be used as a high-temperature polymer electrolyte membrane fuel cell porous electrode.

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: A method for flattening the proton exchange membrane for the fuel cell and an apparatus therefor are used in flattening the proton exchange membrane which is soaked with phosphoric acid. The control precision of this method can be higher than the traditional adsorption method. The mechanical transfer of proton exchange membrane can be realized so that the processing efficiency of proton exchange membrane in the process of fuel cell membrane electrode assembly is greatly improved.

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: An alkaline negative electrolyte and alkaline zinc-iron flow battery assembled by same are provided. The alkaline negative electrolyte includes zinc ions, a complexing agent, and alkali; the complexing agent is at least one selected from the group consisting of ethylenediaminetetraacetic acid, ethylene glycol diethyl ether diamine tetraacetic acid, cyclohexane tetraacetic acid, and ethylenediamine tetrapropionic acid; a molar ratio of the zinc ions to the complexing agent is 1:1; and a molar ratio of the complexing agent to the alkali is 1:(3-4). The zinc ions in the negative electrolyte are in form of a complex state, which is used as the negative electrolyte to assemble and obtain the alkaline zinc-iron flow battery, solves the problem of electrolyte migration in alkaline zinc-iron flow battery and improves the cycling stability of the battery; moreover, it improves the low-temperature performance of the battery, and broadens the operating temperature range of alkaline zinc-iron flow battery.

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: A preparation method of a polyester is provided. The method includes the following steps: allowing a raw material including a diacid and a diol to contact a monoclinic nano-TiO2 (namely, TiO2(B)) catalyst, and conducting an esterification reaction and a polycondensation reaction sequentially to obtain the polyester. The method can efficiently catalyze the synthesis of the polyester and avoid from yellowing of the polyester. Meanwhile, nano-TiO2(B) is polymerized in situ in the polyester, such that a structure of nano-TiO2(B) can adjust the structure and properties of a polyester matrix and effectively improve the mechanical, thermal, and barrier properties of the polyester.

Abstract: A multi-fuel fuel cell system is based on the distributed hydrogen production and fuel cell technologies is presented. The system includes fuel supply unit, fuel processor, fuel cell, heat exchange and oxidizer supply units. The fuel processor is a plasma-catalytic reformer. The heat exchange unit is a multiflow heat exchanger which is of a cascading structure from bottom top or a concentric cylinder structure from inside to outside. The multiflow heat exchanger has the function of balancing the heat of fuel processor and fuel cell. The fuel storage is connected to the fuel processor by the pipeline and provides fuel for the fuel processor. The outlet of fuel processor is connected via the multiflow heat exchanger to the fuel cell anode, and provides reactant for the fuel cell.

Abstract: A method for producing dicarboxylic acid. The method includes: subjecting a raw material system including a cyclic olefin and a lower monocarboxylic acid to an addition reaction in the presence of an addition reaction catalyst to generate an intermediate product system including cyclic carboxylic acid ester; and subjecting the intermediate product system including cyclic carboxylic acid ester to a ring-opening and oxidation reaction in the presence of an oxidant and an oxidation catalyst to generate a corresponding dicarboxylic acid product. The addition reaction in the dicarboxylic acid synthesis route achieves a high single-pass conversion rate, and the selectivity of the corresponding cyclic carboxylic acid ester is high. The addition-oxidation synthesis route achieves faster reaction rates for both the addition reaction and oxidation reaction, and high yield of corresponding dicarboxylic acid product.

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.