37results about How to "Inhibition of disproportionation" patented technology

The purpose of the present invention is to provide a safe and high-performance refrigeration cycle apparatus whereby, even when a refrigerant that can cause a disproportionation reaction is used as one component of a non-azeotropic refrigerant mixture in the refrigeration cycle apparatus, it becomes possible to avoid the refrigerant being exposed to a condition in which the disproportionation reaction can occur. A refrigeration cycle apparatus, in which a non-azeotropic refrigerant mixture is used as a working refrigerant, wherein the non-azeotropic refrigerant mixture comprises a first refrigerant and a second refrigerant having such a property that the boiling point of the second refrigerant can become higher than that of the first refrigerant under the same pressure. The refrigeration cycle apparatus is equipped with at least a main passage, wherein the main passage is composed of a compressor, a first heat exchanger, an expansion valve, a gas / liquid separator and a second heat exchanger which are connected in this order. In the refrigeration cycle apparatus, the first refrigerant has a property of causing a disproportionation reaction, and an initial operation for reducing the temperature or pressure of the refrigerant ejected from the compressor compared with that employed in an ordinary operation on the basis of the amount of the liquid refrigerant in the gas / liquid separator is carried out in an initial stage that is to be carried out subsequently to the starting up of the compressor.

The objective is to provide a safe, high-performance refrigeration cycle device with which it is possible to avoid a condition wherein the refrigerant causes a chain reaction, even when a refrigerant that generates a disproportionation reaction is used in the refrigeration cycle device. This refrigeration cycle device is equipped with: a main circuit wherein a compressor, a first heat exchanger, an expansion valve, and a second heat exchanger are sequentially connected, and in which a non-azeotropic mixed refrigerant (which includes at least a first refrigerant and a second refrigerant characterized by having a higher boiling point than the first refrigerant under the same pressure) operates as a standard composition refrigerant; and a composition separation circuit connected to the main circuit. The first refrigerant has the property of producing a disproportionation reaction, and the composition separation circuit is configured such that when operating in a separation / storage mode wherein the composition of the standard composition refrigerant is separated, a mixed refrigerant for which the composition ratio of the first refrigerant is higher than the standard composition refrigerant is separated from the main circuit, and is stored.

The invention belongs to the field of a lithium ion battery and specifically relates to a compound anode material for the lithium ion battery and a preparation method thereof. The material provided by the invention is prepared by a hydrothermal reaction method; Cr2O3 is coated on the outer layer of a LiNi0.5Mn1.5O4 anode material; the material has a shape of sphere with grain diameter of 15-20mu m; the morphology is uniform; the structure is stable; the component is controllable; the specific discharge capacity is high; the cycling stability and the capacity retention ratio are increased; the synthesizing method is simple and easy to operate; and the compound anode material can be used as a high-performance standby anode material of the power battery.

The invention discloses a preparation method of pentaerythritol and dipentaerythritol, which comprises the following steps of: S1, heating formaldehyde to a set temperature by taking a formaldehyde aqueous solution as bottom water, adding an alkali solution and an acetaldehyde aqueous solution into the bottom water, and carrying out condensation reaction at a constant temperature; S2, adding a formic acid aqueous solution into the bottom water to stop the reaction to obtain a condensation solution containing pentaerythritol, dipentaerythritol and formate; S3, carrying out multistage evaporation and crystallization, and respectively collecting excessive formaldehyde, pentaerythritol, dipentaerythritol and formate from the condensation solution to obtain the pentaerythritol and the dipentaerythritol, wherein the molar ratio of the formaldehyde to the acetaldehyde is (4-10):1, the molar ratio of the alkali to the acetaldehyde is (1-2):1. According to the invention, the condensation reaction is carried out under the condition of constant temperature, the raw materials are easy to obtain, the control is simple, the product yield is high, and the product purity is high.

The invention is applied to the field of flow batteries, and particularly relates to a positive electrode electrolyte for a zinc-manganese flow battery. The positive electrode electrolyte of the zinc-manganese flow battery comprises a manganese ion reaction active substance, a supporting electrolyte and solvent water, the manganese ion reaction active substance is a divalent manganese ion complex, and the supporting electrolyte is used for improving the solution conductivity. According to the invention, the manganese ion complex is selected as a positive active material, and the coordination structure of manganese ions is changed by utilizing the complexation reaction of divalent manganese ions and the complexing agent, so that the problem of disproportionation of trivalent manganese ions is solved, and the coulombic efficiency and the energy efficiency of the battery are improved, and long-term stable circulation is realized. The novel zinc-manganese flow battery provided by the invention is pollution-free, safe and reliable, and has price and resource advantages.

A refrigeration cycle device is equipped with a refrigeration cycle circuit wherein a compressor (102), an indoor heat exchanger (103), an expansion valve (104), and an outdoor heat exchanger (105) are connected. In addition, an operating fluid that includes R1123 (1,1,2-trifluoroethylene) and R32 (difluoromethane) is used as a refrigerant enclosed in the refrigeration cycle circuit, and an electric motor driving device that drives an electric motor of the compressor (102) is provided with a rotational frequency estimation unit. The rotational frequency estimation unit estimates the rotationalspeed on the basis of a detected value for the current input to the electric motor, or on the basis of information about the magnetic pole position of a rotor forming the electric motor.

The invention discloses a supported modified zeolite molecular sieve catalyst. The catalyst comprises a modified zeolite molecular sieve carrier and a loaded active component, wherein the modified zeolite molecular sieve carrier is prepared through modification of a zeolite molecular sieve through the following steps: mixing the molecular sieve with an alkaline solution of alkali metal elements, and carrying out washing, drying and roasting to obtain a preliminary modified carrier; impregnating the preliminary modified carrier with a soluble compound solution containing lanthanide and boron, and carrying out drying and roasting to obtain the modified zeolite molecular sieve carrier containing lanthanide oxide and boron trioxide. The invention also discloses a preparation method of the catalyst and the application of the catalyst in synthesis of DEMMA. By using the catalyst provided by the invention, the advantages of high raw material conversion rate, good product selectivity and few byproducts are achieved; moreover, the preparation process of the catalyst is simple, the economical efficiency is good, and the catalyst has a good application prospect.

The invention discloses a method for reducing carbon deposition of a catalyst in resource utilization of HFC-23. The resource utilization is realized by performing a fluorine-chlorine exchange reaction on HFC-23 and halogenated hydrocarbon; the catalyst for the fluorine-chlorine exchange reaction comprises a main catalyst and a noble metal; the noble metal is at least one selected from Pt, Pd, Ru, Au and Rh, and the addition amount of the noble metal is 0.01-2 wt%; and hydrogen is introduced in the process of the fluorine-chlorine exchange reaction. The catalyst used in the invention has the advantages of good stability, long service life and the like.

The present invention provides a process for producing phosphorohalidate characterized in that a crude reaction product obtained by reacting a phosphorus oxyhalide with an aromatic hydroxy compound in the presence of a Lewis acid catalyst is purified by distillation in the presence of an alkali metal salt. The process of the invention produces a high-purity phosphorohalidate in high yield which contains no impurities such as the phosphorus oxihalidate and aromatic hydroxy compound used as starting materials and the catalyst.

The invention belongs to the technical field of electrolytic copper foil manufacturing, relates to a rapid copper dissolving technology which is used for preparing an electrolyte for electrolytic copper foils, and in particular, relates to a method for rapidly dissolving copper in an electrolytic copper foil manufacturing process, wherein the method comprises the following steps: putting a copper material to be dissolved into a copper dissolving tank filled with a sulfuric acid aqueous solution in advance; then introducing oxygen into the copper dissolving tank through a nano bubble generating device, and controlling the concentration of the sulfuric acid aqueous solution in the copper dissolving tank to be larger than that of electrolyte sulfuric acid in the dissolving process. Based on the method, copper can be dissolved rapidly, generation of cuprous ions can be avoided and effectively reduced, and the rapid copper dissolving technology can completely meet the production requirement of electrolytic copper foils.

The invention discloses a method for preparing high-purity ethyl methyl carbonate in a partition-type reactive distillation tower. Dimethyl carbonate (DMC) and ethanol are prepared in a partitioned reactive distillation column consisting of a reaction section, a stripping section, a common stripping section and a product section to prepare high-purity ethyl methyl carbonate. DMC is fed in two streams, one is mixed with ethanol from the bottom of the reaction section of the main column T1 of the dividing wall reactive distillation column, and the other is fed from the lower part of the reaction section of T1. The catalyst is packed in the reaction section, and DMC and ethanol react in the main tower T1 under the action of the catalyst to form ethyl methyl carbonate and diethyl carbonate; the sub-column T2 of the dividing wall reactive distillation column has only a condenser and no reboiler The product refining tower is used to refine the stream coming from the bottom of the stripping section of the main tower T1, and obtain high-purity ethyl methyl carbonate product from the top of the T2 tower; the DEC of the main tower T1 tower tank is recycled into the reaction section of T1, Used to inhibit the production of DEC, thereby improving the selectivity of the reaction.

The present invention includes a refrigeration cycle circuit that includes compressor, indoor heat exchanger, expansion valve, and outdoor heat exchanger that are connected to each other. A working fluid containing R1123 (1,1,2-trifluoroethylene) and R32 (difluoromethane) is used as a refrigerant sealed in the refrigeration cycle circuit, and an electric motor driving device that drives an electric motor of compressor includes a rotational speed estimator. The rotational speed estimator estimates rotational speed based on information on a detection value of an electric current input to the electric motor or a magnetic pole position of a rotor that constitutes the electric motor.

A chemical copper plating process for hydrogen bearing alloy powder by non-water system features that in the plating procedure, part of water is replaced by organic polar substance (5-80 vol%), which is the mass with hydrophilic polar radicals such as hydroxy, carboxy, or amino radical. Its advantages are high effect on preventing the corrosion and dismutation reaction of copper and plating copper, and high uniformity.

The invention discloses a method for reducing catalyst carbon deposition in resource utilization of HFC-23. The resource utilization adopts HFC-23 and halogenated hydrocarbon to carry out fluorine-chlorine exchange reaction, and the catalyst of the fluorine-chlorine exchange reaction includes a main body Catalyst and noble metal, the noble metal is selected from at least one of Pt, Pd, Ru, Au or Rh, and the addition amount is 0.01-2wt%. During the process of the fluorine-chlorine exchange reaction, hydrogen gas is introduced. The invention has the advantages of good catalyst stability, long service life and the like.

The air conditioner (100) as a refrigerating cycle device of the present invention includes: a protective device (200), which is set when the current value of the input current of the motor of the compressor (103) exceeds the start time of the compressor (103) When the first predetermined value is three times or more the maximum current value during normal operation, the current value of the input current to the motor of the compressor (103) exceeds 2 times the current value set at the start of the compressor (103) When the second predetermined value is more than twice, the number of discharged electrons in the discharge space calculated based on the change in the current value of the input current of the motor of the compressor (103) is set to 1.0×10 19 In the case of at least one of the third predetermined value of units / second or more, at least one of stopping power supply to the compressor (103) and reducing the rotation speed of the compressor (103) is performed.

The invention discloses a gas-phase photothermal catalysis catalyst for synthesizing perfluoroiodomethane as well as its preparation and application. The catalyst is composed of a carrier and an active component. The carrier is one or a combination of tin oxide, titanium dioxide, zirconium dioxide or cadmium sulfide. The active component includes C coated on the surface of the carrier. 3 N 4 And the metal element loaded on the surface of the carrier, the metal element is composed of a lanthanide element and at least one alkali metal element, wherein the mass ratio of a lanthanide element and at least one alkali metal element is 1.0:( 0.1‑30), in the catalyst, based on the carrier quality, C 3 N 4 The loading is 0.5‑30%, and the lanthanide loading is 0.1‑8.0%. The invention provides the application of the catalyst in gas-phase photothermal catalytic synthesis of perfluoroiodocarbon compounds. The catalyst of the invention has good photocatalytic performance, can reduce the reaction temperature, improve the selectivity, and suppress the generation of carbon deposition to increase the service life of the catalyst.

The invention discloses a supported modified zeolite molecular sieve catalyst, which comprises a modified zeolite molecular sieve carrier and a loaded active component, wherein, the modified zeolite molecular sieve carrier is prepared by modifying the zeolite molecular sieve, including: combining the molecular sieve with an alkali metal The alkaline solution of the elements is mixed, washed, dried, and roasted to obtain a preliminary modified carrier; the preliminary modified carrier is impregnated with a soluble compound solution containing lanthanides and boron, dried, and roasted to obtain oxides containing lanthanides and three The modified zeolite molecular sieve carrier of diboron oxide. The invention also discloses the preparation method of the catalyst and the application in synthesizing DEMMA. The catalyst of the invention has high raw material conversion rate, good product selectivity and few by-products, and meanwhile, the catalyst preparation process is simple and economical, and has good application prospect.

The invention discloses a method and a device for increasing bromine stripping rate and extraction rate in an air blowing-out process and belongs to the field of bromine extraction. The method specifically includes: feeding CO2 gas into a bromine-containing solution during or before air blowing-out of oxidation completing liquid. Compared with the prior art, the method has the advantages that by feeding CO2 into brine before sweeping, disproportionation reaction can be inhibited, and dissolution of bromine can be reduced, so that sweeping recovery rate of bromine is increased, and final bromine integral extraction rate is increased.

A refrigeration cycle device includes a refrigeration cycle formed by connecting a compressor, a condenser, an expansion valve and an evaporator to each other. As a refrigerant in the refrigeration cycle, a working fluid containing 1,1,2-trifluoroethylene (R1123) and difluoromethane (R32) is used. A degree of opening of the expansion valve is controlled such that the refrigerant has two phases at a suction portion of the compressor.

The invention discloses a method for improving the stability of a catalyst in resource utilization of HFC-23. The resource utilization adopts HFC-23 and halogenated hydrocarbons to carry out fluorine-chlorine exchange reaction, and the catalyst of the fluorine-chlorine exchange reaction includes a main body A catalyst and a metal oxide, the metal oxide is at least one metal oxide selected from K, Na, Fe, Co, Cu, Ni, Zn or Ti, and the added amount is 0.1-5 wt%. The invention has the advantages of good catalyst stability, long service life, low content of by-product CFC-12, and the like.

The invention discloses a method for preparing ultrahigh-purity ethyl methyl carbonate through a continuous rectification device. The device comprises a rectifying tower I and a rectifying tower II, ethyl methyl carbonate is added into the rectifying tower I through a feeding hole I; a discharge hole I formed in the tower top of the rectifying tower I is used for removing gas-phase light components; tower kettle materials at the bottom in the rectifying tower I are conveyed to a feeding hole II through a conveying pump and enter the rectifying tower II; a discharging opening II formed in the tower top of the rectifying tower II is used for removing gas-phase light components, a discharging opening III formed in the rectifying tower II is used for extracting a high-purity ethyl methyl carbonate product, and tower kettle material heavy components at the bottom in the rectifying tower II are extracted through the conveying pump. By adopting the technical scheme, the defects of batch-typerectification are overcome, the production efficiency is high, and more than 99.99% of high-purity ethyl methyl carbonate product can be conveniently extracted from the tower of the rectifying tower II.