102 results about "Difluoroethyne" patented technology

A process for preparing difluorochloro ethane from difluoroethane and chlorine gas includes proportionally mixing, three-class photo-chemical reaction while regulating light flux for presenting the high-boiling-point substance peaks with different heights, removing acid, alkali washing, compressing, degassing, rectifying and drying. Its equipment is disclosed also. Its advantages are high conversion rate of difluoroethane and high selectivity and purity of product.

There is provided a composition of refrigerant mixtures for high back pressure condition, comprising propane, propylene or 1,1-difluoroethane and, optionally, additive selected from the group consisting of carbon dioxide, trifluoromethyl iodide and mixture thereof. The composition according to the present invention is environment-friendly and can be directly drop in the conventional refrigerator system adopting HCFC-22 refrigerant without any systemic change.

The invention discloses an environment-friendly mixed refrigerant. The refrigerant comprises the following components, in percentages by mass: 1%-90% of a first component, 1%-90% of a second component, 1%-90% of a third component and 1%-97% of a fourth component, wherein the first component is trifluoroiodomethane, the second component is at least one selected from 1,1,1,2-tetrafluoroethane and pentafluoroethane, the third component is at least one selected from trans-1,3,3,3-tetrafluoropropene, 2,3,3,3-tetrafluoropropene and difluoromethane, and the fourth component is at least selected from1,1-difluoroethane, monofluoroethane, propylene, propane, dimethyl ether and isobutane. The GWP value of the mixed refrigerant provided by the invention is greatly reduced relative to R404A, the ODP is 0, and the environmental performance is better than that of the R404A.

The invention relates to an environment-friendly mixed working medium, a preparation method thereof and a device comprising the environment-friendly mixed working medium. The mixed working medium comprises a first component trifluoroiodomethane (R13I1), a second component 1, 1-difluoroethane (R152a), a third component isobutane (R600a) and a fourth component, wherein the fourth component is one ofthe propane (R290) or propylene (R1270); or the mixed working medium comprises the first component trifluoroiodomethane (R13I1), the second component fluoroethane (R161), the third component difluoromethane (R32) and the fourth component, wherein the fourth component is one of trans-1, 3, 3, 3-tetrafluoropropene (R1234ze (E)) or propylene (R1270). According to the present invention, the preferredlubricant polyalkylene glycol, stabilizer butylated hydroxytoluene and extreme pressure agent zinc dialkyl dithiophosphate can be added into the environment-friendly mixed working medium, so that theperformance and stability of the mixed working medium are enhanced. Meanwhile, the mixed working medium is good in environment performance, has the GWP lower than 100, enables the volume refrigerating capacity and the volume heating capacity to be greatly improved by 30% or above, and has the smaller temperature slippage.

The invention discloses a green mixed refrigerant, comprising 20-60 wt% of 2,3,3,3-tetrafluoro propylene or trans-1,3,3,3-tetrafluoro propylene, 5-30 wt% of 1,1-difluoroethane or 1,1,1,2-tetrafluoro ethane, and 35-60 wt% of difluoromethane. The preparation method is characterized by physically mixing the above ingredients according to corresponding ratio at normal temperature. According to the invention, because the volume refrigerating capacity of the green mixed refrigerant is very close to that of HCFC-22 and the condensation pressure of the green mixed refrigerant is lower than that of R410A, the green mixed refrigerant can be directly filled in existing refrigeration, air-conditioning or heat pump sets which use HCFC-22; and when HCFC-22 is replaced, the components and pipeline of the system have no need of redesigning. The green mixed refrigerant can be an alternative refrigerant to HCFC-22 and R410A.

The invention discloses a method for preparing 1, 1-difluoroethane and a fluorination catalyst using the method. The method is characterized in that in the presence of a chromium-based fluorination catalyst, ethyne and anhydrous hydrofluoric acid are gasified and mixed to undergo gas-phase fluorination reaction so as to generate 1,1- difluoroethane HFC-152a(C2H4F2); the reaction temperature is between 140 and 380 DEG C; the pressure is between 0.3 and 1.8 MPa; under the standard condition, air speed of a reactor is between 300 and 2,200 h<-1>; the mixture ratio of the reaction materials of the anhydrous hydrofluoric acid to the ethyne is 4 to 1-30 to 1; the transformation rate of the ethyne in an outlet of the reactor reaches over 75 percent; and the selectivity of HFC-152a reaches over 90 percent.

The invention disclose a method for preparing fluorine-containing ethylene by catalytic cracking of 2-chloro-1,1-difluoroethane. The method comprises the following steps that (i), a catalytic crackingcatalyst is provided, wherein the catalyst comprises fluoride carried on active carbon, the weight ratio of the active carbon to the fluoride is 1 to (0.01-0.5), and the fluoride is selected from aluminum fluoride, chromium fluoride, potassium fluoride, magnesium fluoride, calcium fluoride, or a mixture of two or more of the aluminum fluoride, chromium fluoride, potassium fluoride, magnesium fluoride and calcium fluoride; (ii), the catalyst is loaded into a catalytic cracking reactor, a mixture of preheated inert gas and the 2-chloro-1,1-difluoroethane is introduced, and the catalyst is activated; and (iii), the mixture of preheated 2-chloro-1,1-difluoroethane and inert gas is introduced, the reaction temperature is 400-700 DEG C, space velocity is 200-3000h<-1>, pressure is 0.1-1.0Mpa, and 1,1-dichloroethylene is obtained.

The invention relates to a novel environment friendly refrigerating fluid which is prepared by 1,1-difluoroethane, difluoromethane, pentafluoroethane and carbureted hydrogen component, the carbureted hydrogen component is formed by choosing one or more than one of iso-butane, n-butane, dimethylmethane and propene with arbitrary proportion, and all components are as follows by mass percent: 5-98 percent of 1,1-difluoroethane, 1-60 percent of difluoromethane, 0-30 percent of pentafluoroethane, and 1-20 percent of the carbureted hydrogen component; the ODP value of the refrigerating fluid is zero without damaging atmospheric ozone layer, and compared with HCFC-22 and the existing substitution R407 and R410A, the GWP value is greatly reduced and the environment protecting performance is better; in addition, the charging amount is reduced, the energy efficiency ratio is improved, resource is saved, the novel environment friendly refrigerating fluid can be used as long-term substituent for HCFC-22.

The invention provides a catalyst for preparing vinyl fluoride through gas phase removal of HF by virtue of 1,1-difluoroethane as well as a preparation method and application of the catalyst. The catalyst is prepared by the steps of preparing a precursor from a carrier and an active component, and carrying out roasting and trifluoromethane fluorination, wherein the carrier is activated carbon, andthe active component is metal chloride or metal nitrate. The prepared catalyst is applied to the preparation of vinyl fluoride by virtue of 1,1-difluoroethane, the anti-carbon performance of the catalyst is remarkably improved, and the service life of the catalyst is prolonged; and meanwhile, the selectivity of reaction for preparing vinyl fluoride from 1,1-difluoroethane at low temperature and the conversion rate of 1,1-difluoroethane(R152a) are relatively high.

The invention provides a ternary refrigeration composition and a refrigeration device comprising the same. The ternary refrigeration composition is composed of a first component and a second component, the first component is fluoroethane, and the second component is selected from any two of 1, 1-difluoroethane, difluoromethane and 2, 3, 3, 3-tetrafluoropropene. According to the present invention,the environmental protection property and the thermodynamic property of fluoroethane are similar to those of R290 while the combustibility of fluoroethane is lower than R290, and fluoroethane and thesecond component with the combustibility of class 2 or 2L are used together, so that the refrigeration composition can have characteristics of low GWP, good thermodynamic property and low combustibility grade, and the use safety is improved; the ternary refrigeration composition has an ODP value of zero, and does not cause damage to the ozone layer even after long-term use. Therefore, the ternaryrefrigeration composition has lower GWP, ODP is 0, the combustibility is 2 types, and the capacity and the energy efficiency of a unit are equivalent to those of a unit using an R290 refrigerant whenthe ternary refrigeration composition is applied.

The invention relates to the technical field of refrigerants, in particular to a ternary environment-friendly mixed refrigerant, a preparation method of the ternary environment-friendly mixed refrigerant and a refrigerating system. The ternary environment-friendly mixed refrigerant comprises 1, 1-difluoroethane, 2, 3, 3, 3-tetrafluoropropene and trifluoroiodomethane, the GWP value of the ternary environment-friendly mixed refrigerant is smaller than 150, and the ODP value of the ternary environment-friendly mixed refrigerant is 0. The ternary environment-friendly mixed refrigerant is preparedfrom the following components in percentage by mole: 40-80 percent of 1, 1-difluoroethane, 4-64 percent of 2, 3, 3, 3-tetrafluoropropene and 4-52 percent of trifluoroiodomethane. The preparation method of the ternary environment-friendly mixed refrigerant comprises the following steps: mixing and stirring the components of the ternary environment-friendly mixed refrigerant at room temperature in aliquid phase state to obtain the ternary environment-friendly mixed refrigerant. The ternary environment-friendly mixing system provided by the invention has the environment-friendly characteristic of low GWP, the refrigerating capacity per unit volume and the system performance coefficient are close to those of R152a, the combustibility is greatly improved, and an R152a refrigerant can be well replaced.

The invention relates to a method for purifying 1,1-difluoroethane through liquid phase adsorptive separation. An adsorbent which is one or a combination of more of silica gel, activated aluminium oxide, activated magnesium oxide and aluminosilicate absorbents and a carbon-based adsorbent is used, and an adsorbent, which has the BET surface area of more than or equal to 400m<2>/g and the single-point average pore size of about 5 and is capable of reducing the content of total olefins in crude chloroethylene-containing 1,1-difluoroethane to below 10ppm and reducing the content of chloroethylene to below several ppm and even below 1 ppm, is preferred. The 1,1-difluoroethane can be independently used, and also can be mixed with other materials to serve as a low temperature refrigerant, a foaming agent, a propellant, an etching gas, a cleaning agent or an intermediate of other fluorocarbon compounds.

The invention provides a heat transfer medium comprising a first component, a second component and a third component; the first component is one of 1, 1, 1, 2-tetrafluoroethane (R134a), 1, 1, 1, 2, 2-pentafluoroethane (R125), 1, 1, 1, 2, 3, 3, 3-heptafluoropropane (R227ea) and trifluoroiodomethane (R13I1); the second component is one of 1, 1-difluoroethane (R152a), 2, 3, 3, 3-tetrafluoropropene (R1234yf) and trans 1, 3, 3, 3-tetrafluoropropene (R1234ze (E)); the third component is one of fluoroethane (R161), cyclopropane (RC270), dimethyl ether (RE170) and isobutane (R600a); the heat transfermedium has the environment-friendly characteristics of low GWP and zero ODP, obvious environmental protection advantages and good thermal performance, can replace R134a heat transfer medium to be applied to coolers, especially centrifugal coolers, and can be well matched with existing equipment without system redesigning.