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.

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 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 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 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.

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.