Azeotrope or azeotrope-like compositions containing 1,1,2-trichloroethane, trans-1,2-dichloroethylene or cis-1,2-dichloroethylene and hydrogen fluoride

Abstract

The technical problem to be solved by this invention is to provide a novel azeotropic or azeotropic composition useful for the separation of 1,1,2-trichloroethane (HCC-140), trans-1,2-dichloroethylene (HCO-1130(E)) or cis-1,2-dichloroethylene (HCO-1130(Z)) from HF. As a solution, an azeotropic or azeotropic composition containing HCC-140, HCO-1130(E) or HCO-1130(Z) and hydrogen fluoride is provided.

Description

Technical Field

[0001] The present invention relates to an azeotropic or azeotropic composition containing 1,1,2-trichloroethane, trans-1,2-dichloroethylene or cis-1,2-dichloroethylene and hydrogen fluoride. Background Technology

[0002] HFCs containing olefins with low warming coefficients, namely trans-1,2-difluoroethylene and cis-1,2-difluoroethylene (labeled HFO-1132(E) and HFO-1132(Z) respectively) as HFOs (hydrofluoroolefins), are very promising alternatives to the refrigerants used to date in air conditioners using R-410A, HFC-32, and HFC-134a (Patent Document 1). In most cases, these fluoroolefins are produced by reacting hydrogen fluoride with haloalkanes or haloolefins having the corresponding number of carbon atoms as raw materials, in the presence or absence of a catalyst, via a gas-phase or liquid-phase fluorination reaction. However, the conversion rate of the raw materials (haloalkanes or haloolefins and hydrogen fluoride) is not necessarily 100%, requiring separation of the reaction products from the raw materials.

[0003] The most reasonable method for producing E-1,2-difluoroethylene (HFO-1132(E)) is the dehydrofluorination reaction of 1,1,2-trifluoroethane (HFC-143). An advantageous method for producing HFC-143 in terms of yield is to use 1,1,2-trichloroethane (HCC-140), trans-1,2-dichloroethylene (HCO-1130(E)), or cis-1,2-dichloroethylene (HCO-1130(Z)) as raw materials, and to carry out a fluorination reaction in the presence or absence of a catalyst under gas-phase or liquid-phase conditions.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: International Publication No. 2012 / 157765 Summary of the Invention

[0007] The technical problem that the invention aims to solve

[0008] The technical problem to be solved by the present invention is to provide a novel azeotropic or azeotropic composition useful for separating HCC-140, HCO-1130(E) or HCO-1130(Z) as raw materials from HF. This raw material is used in the production of reaction products containing HFC-143, HFO-1132(E) and HFO-1132(Z) and 1,2-dichloro-1-fluoroethane (HCFC-141), trans-1-chloro-2-fluoroethylene (HCFO-1131(E)), cis-1-chloro-2-fluoroethylene (HCFO-1131(Z)) or 1-chloro-1,2-difluoroethane (HCFC-142) as intermediates thereof.

[0009] Technical solutions for solving technical problems

[0010] Item 1.

[0011] An azeotropic or azeotropic composition comprising 1,1,2-trichloroethane (HCC-140) and hydrogen fluoride.

[0012] Item 2.

[0013] The azeotropic or azeotropic composition as described in item 1, wherein the composition contains more than 10% by mass and less than 99% by mass of HCC-140 relative to the whole composition.

[0014] Item 3.

[0015] An azeotropic or azeotropic composition comprising trans-1,2-dichloroethylene (HCO-1130(E)) and hydrogen fluoride.

[0016] Item 4.

[0017] The azeotropic or azeotropic composition as described in item 3, wherein, relative to the composition as a whole, it contains more than 10% by mass and less than 99% by mass of HCO-1130(E).

[0018] Item 5.

[0019] An azeotropic or azeotropic composition comprising cis-1,2-dichloroethylene (HCO-1130(Z)) and hydrogen fluoride.

[0020] Item 6.

[0021] The azeotropic or azeotropic composition as described in item 5, wherein, relative to the composition as a whole, contains more than 15% by mass and less than 99% by mass of HCO-1130(Z).

[0022] Item 7.

[0023] A method for separating a mixture containing HCC-140 and hydrogen fluoride, comprising:

[0024] (a) The process of feeding a composition containing HCC-140 and hydrogen fluoride into a first distillation column;

[0025] (b) The step of extracting an azeotropic composition containing HCC-140 and hydrogen fluoride as the first distillate, and extracting a composition having a concentration of either HCC-140 or hydrogen fluoride higher than that supplied in (a) as the bottom composition of the first distillation column; and

[0026] The process of supplying the first distillate to a second distillation column with different operating conditions for distillation, as required by (c).

[0027] Item 8.

[0028] A method for separating a mixture containing HCO-1130(E) and hydrogen fluoride, comprising:

[0029] (d) The process of feeding the composition containing HCO-1130(E) and hydrogen fluoride into the first distillation column;

[0030] (e) The step of extracting an azeotropic composition containing HCO-1130(E) and hydrogen fluoride as the first distillate, and extracting a composition having a concentration of either HCO-1130(E) or hydrogen fluoride higher than that supplied in (d) as the bottom composition of the first distillation column; and

[0031] The process of supplying the first distillate to a second distillation column with different operating conditions for distillation as required (f).

[0032] Item 9.

[0033] A method for separating a mixture containing HCO-1130(Z) and hydrogen fluoride, comprising:

[0034] (g) The process of feeding a composition containing HCO-1130(Z) and hydrogen fluoride into a first distillation column;

[0035] (h) The step of extracting an azeotropic composition containing HCO-1130(Z) and hydrogen fluoride as the first distillate, and extracting a composition whose concentration of either HCO-1130(Z) or hydrogen fluoride is higher than that of the composition supplied in (g) as the bottom composition of the first distillation column; and

[0036] The process of supplying the first distillate to a second distillation column with different operating conditions for distillation as needed (i).

[0037] Item 10.

[0038] The separation method described in items 7 to 9, wherein distillation is carried out within a pressure range of 0.05 MPa to 1 MPa.

[0039] Invention Effects

[0040] Using this invention, it is possible to provide a novel azeotropic or azeotropic composition. Attached Figure Description

[0041] Figure 1 This is a diagram illustrating an example of a distillation separation process using an azeotropic composition.

[0042] Figure 2 This is a diagram illustrating an example of a distillation separation process using an azeotropic composition.

[0043] Figure 3 This is a diagram illustrating an example of a distillation separation process using an azeotropic composition. Detailed Implementation

[0044] <Definition of Terms>

[0045] In this specification, the term "quasi-azeotropic composition" refers to a composition that can be treated substantially in the same way as an azeotropic composition. Specifically, in this specification, the term "quasi-azeotropic composition" refers to a mixture of two or more substances with azeotropic or substantially azeotropic points that are treated substantially as single substances. As one of the characteristics of a quasi-azeotropic composition, one can cite examples where the composition of the vapor produced by the evaporation or distillation of the liquid does not substantially change with the composition of the liquid. That is, in this specification, a mixture is called a quasi-azeotropic composition when it boils, distills, or refluxes without undergoing a substantial change in composition. Specifically, when the difference between the vapor pressure of the bubbling point of the composition and the vapor pressure of the dew point of the composition at a specific temperature is less than 3% (using the bubbling point pressure as a reference), the composition is defined as a quasi-azeotropic composition in this invention.

[0046] In this specification, in azeotropic compositions and azeotropic-like compositions, the case where the liquid phase is separated into two liquid phases is referred to as heterogeneous azeotropic compositions and heterogeneous azeotropic-like compositions, respectively.

[0047] In this specification, the pressure described is in absolute pressure (MPa). That is, 1 atmosphere is defined as approximately 0.1013 MPa.

[0048] The inventors of this invention focus on the fact that in existing HFC-143 manufacturing methods, not all raw materials can be converted into the target product. A method is needed to separate, recycle, and reuse these materials. The reason is that if they are not recycled, these raw materials will be lost, thus increasing costs.

[0049] The inventors discovered that these compositions are useful when the combination of specific components contained in raw materials forms azeotropic or azeotropic compositions, and when they are separated by methods such as distillation, extraction, or liquid-liquid separation, until the completion of this invention.

[0050] 1. Composition 1

[0051] Composition 1 contains HCC-140 and hydrogen fluoride (HF), and is an azeotropic or azeotropic composition containing an effective amount of hydrogen fluoride for forming an azeotropic or azeotropic composition with HCC-140.

[0052] Composition 1 preferably contains more than 10% by mass and less than 99% by mass of HCC-140 relative to the composition as a whole.

[0053] Composition 1 contains HCC-140 and hydrogen fluoride, and may also contain additional compounds. The total proportion and types of additional compounds may be appropriately selected within a range that does not prevent Composition 1, containing a mixture of HCC-140 and hydrogen fluoride as an azeotropic or azeotropic composition, from forming an azeotropic or azeotropic composition.

[0054] Using the composition 1 as a whole as a reference, the total content of the additional compounds is preferably greater than 0 and less than 1% by mass, more preferably greater than 0 and less than 0.5% by mass, and even more preferably greater than 0 and less than 0.1% by mass.

[0055] The additional compound is not particularly limited and can be widely selected within the range that does not prevent composition 1 from forming an azeotropic or azeotropic composition. The additional compound can be one or more.

[0056] Examples of additional compounds include 1-chloro-1,2,2-trifluoroethane (HCFC-133), 1-chloro-1,1,2-trifluoroethane (HCFC-133b), 2-chloro-1,1,1-trifluoroethane (HCFC-133a), 1,1-dichloro-2,2,2-trifluoroethane (HCFC-123), 1,1-difluoroethane (HFC-152a), 1,2-difluoroethane (HFC-152), fluoroethane (HFC-161), 1,1,1-trifluoroethane (HFC-143a), 1,1,1,2-tetrafluoroethane (HFC-134a), difluoromethane (HFC-32), and pentafluoroethane. (HFC-125), fluoromethane (HFC-41), dichlorofluoromethane (HFC-22), ethylene, propylene, acetylene, 1-chloro-1,2-difluoroethane (HCFC-142a), 2,3,3,3-tetrafluoropropylene (HFO-1234yf), 1,3,3,3-tetrafluoropropylene (HFO-1234ze), 1,2,3,3,3-pentafluoropropylene (HFO-1225ye), fluoroethylene (HCFO-1141), 1,1-difluoroethylene (HFO-1132a), 1-chloro-2,2-difluoroethylene (HCFO-1122), and 1-chloro-1,2-difluoroethylene (HCFO-1122a), etc.

[0057] Composition 1 can become an important composition when azeotropic distillation is carried out in a mixture of HCC-140 and the additional compound to separate the additional compound from HCC-140.

[0058] Azeotropic distillation is a method of concentrating or separating a target substance by operating a distillation column under conditions where an azeotropic or azeotropic-like composition is separated. Sometimes, azeotropic distillation can be used to distill only the target component, but sometimes it also occurs when other components that form an azeotropic mixture with the target component are added externally. In a narrower sense, only the latter is referred to as azeotropic distillation. For example, azeotropic distillation can be used to extract an azeotropic or azeotropic-like composition containing HCC-140 and an additional compound from a composition containing at least HCC-140 and an additional compound, thereby separating the additional compound from HCC-140.

[0059] 2. Composition 2

[0060] Composition 2 is essentially composed of only HCO-1130(E) and hydrogen fluoride, and is an azeotropic or azeotropic composition containing an amount of hydrogen fluoride effective for forming an azeotropic or azeotropic composition with HCO-1130(E).

[0061] Relative to the composition as a whole, composition 2 preferably contains more than 10% by mass and less than 99% by mass of HCC-1130(E), more preferably more than 25% by mass and less than 75% by mass of HCO-1130(E).

[0062] Composition 2 contains HCO-1130(E) and hydrogen fluoride, and may also contain additional compounds. The total proportion and types of additional compounds may be appropriately selected within a range that does not prevent the formation of an azeotropic or azeotropic composition by composition 2 containing a mixture of HCO-1130(E) and hydrogen fluoride as an azeotropic or azeotropic composition.

[0063] Using the composition 2 as a whole as a reference, the total content of the additional compounds is preferably greater than 0 and less than 1% by mass, more preferably greater than 0 and less than 0.5% by mass, and even more preferably greater than 0 and less than 0.1% by mass.

[0064] The additional compound is not particularly limited and can be widely selected within the range that does not prevent composition 2 from forming an azeotropic or azeotropic composition. The additional compound can be one or more.

[0065] Examples of additional compounds include 1-chloro-1,2,2-trifluoroethane (HCFC-133), 1-chloro-1,1,2-trifluoroethane (HCFC-133b), 2-chloro-1,1,1-trifluoroethane (HCFC-133a), 1,2-difluoroethane (HFC-152), fluoroethane (HFC-161), 1,1,1-trifluoroethane (HFC-143a), 1,1,1,2-tetrafluoroethane (HFC-134a), difluoromethane (HFC-32), pentafluoroethane (HFC-125), fluoromethane (HFC-41), and chloro... Difluoromethane (HFC-22), ethylene, propylene, acetylene, 1-chloro-1,2-difluoroethane (HCFC-142a), 2,3,3,3-tetrafluoropropylene (HFO-1234yf), 1,3,3,3-tetrafluoropropylene (HFO-1234ze), 1,2,3,3,3-pentafluoropropylene (HFO-1225ye), fluoroethylene (HCFO-1141), 1,1-difluoroethylene (HFO-1132a), 1-chloro-2,2-difluoroethylene (HCFO-1122), and 1-chloro-1,2-difluoroethylene (HCFO-1122a), etc.

[0066] Composition 2 can become an important composition when azeotropic distillation is carried out in a mixture of HCO-1130(E) and the additional compound to separate the additional compound from HCO-1130(E).

[0067] For example, azeotropic distillation can be used to extract an azeotropic or near-azeotropic composition containing HCO-1130(E) and an additional compound from a composition containing at least HCO-1130(E) and an additional compound, thereby enabling the separation of the additional compound from HCO-1130(E).

[0068] 3. Composition 3

[0069] Composition 3 is essentially composed of only HCO-1130(Z) and hydrogen fluoride, and is an azeotropic or azeotropic composition containing an amount of hydrogen fluoride effective for forming an azeotropic or azeotropic composition with HCO-1130(Z).

[0070] Relative to the composition as a whole, composition 3 preferably contains more than 15% by mass and less than 99% by mass of HCO-1130(Z), more preferably more than 20% by mass and less than 65% by mass of HCO-1130(Z).

[0071] Composition 3 contains HCO-1130(Z) and hydrogen fluoride, and may also contain additional compounds. The total proportion and types of additional compounds may be appropriately selected within a range that does not prevent the formation of an azeotropic or azeotropic composition by composition 3 containing a mixture of HCO-1130(Z) and hydrogen fluoride as an azeotropic or azeotropic composition.

[0072] Using the composition 3 as a whole as a reference, the total content of the additional compounds is preferably greater than 0 and less than 1% by mass, more preferably greater than 0 and less than 0.5% by mass, and even more preferably greater than 0 and less than 0.1% by mass.

[0073] The additional compound is not particularly limited and can be widely selected within the range that does not prevent composition 3 from forming an azeotropic or azeotropic composition. The additional compound can be one or more.

[0074] Examples of additional compounds include 1-chloro-1,2,2-trifluoroethane (HCFC-133), 1-chloro-1,1,2-trifluoroethane (HCFC-133b), 2-chloro-1,1,1-trifluoroethane (HCFC-133a), 1,1-dichloro-2,2,2-trifluoroethane (HCFC-123), 1,1-difluoroethane (HFC-152a), 1,2-difluoroethane (HFC-152), fluoroethane (HFC-161), 1,1,1-trifluoroethane (HFC-143a), 1,1,1,2-tetrafluoroethane (HFC-134a), difluoromethane (HFC-32), and pentafluoroethane. (HFC-125), fluoromethane (HFC-41), dichlorofluoromethane (HFC-22), ethylene, propylene, acetylene, 1-chloro-1,2-difluoroethane (HCFC-142a), 2,3,3,3-tetrafluoropropylene (HFO-1234yf), 1,3,3,3-tetrafluoropropylene (HFO-1234ze), 1,2,3,3,3-pentafluoropropylene (HFO-1225ye), fluoroethylene (HCFO-1141), 1,1-difluoroethylene (HFO-1132a), 1-chloro-2,2-difluoroethylene (HCFO-1122), and 1-chloro-1,2-difluoroethylene (HCFO-1122a), etc.

[0075] Composition 3 can become an important composition when azeotropic distillation is carried out in a mixture of HCO-1130(Z) and the additional compound to separate the additional compound from HCO-1130(Z).

[0076] For example, azeotropic distillation can be used to extract an azeotropic or near-azeotropic composition containing HCO-1130(Z) and an additional compound from a composition containing at least HCO-1130(Z) and an additional compound, thereby enabling the separation of the additional compound from HCO-1130(Z).

[0077] 2. Separation methods

[0078] In addition, the present invention also relates to a method for separating these components using the above-described composition.

[0079] For example, azeotropic distillation can be used to extract an azeotropic or near-azeotropic composition containing HCC-140, HCO-1130(E) or HCO-1130(Z), hydrogen fluoride and an additional component from a composition containing at least HCC-140, HCO-1130(E) or HCO-1130(Z), hydrogen fluoride and an additional component, thereby enabling the separation of the additional component from HCC-140, HCO-1130(E) or HCO-1130(Z).

[0080] A simple method for separating HCC-140, HCO-1130(E), or HCO-1130(Z) from HF is to wash the water with water to absorb the HF and then recover it. However, using this method, in most cases the water that has absorbed hydrogen fluoride forms hydrofluoric acid, which needs to be disposed of as waste, thus increasing costs and making it very inefficient.

[0081] The separation method of the present invention can solve the above-mentioned technical problems.

[0082] The separation method of the present invention for a mixture containing HCC-140 and hydrogen fluoride specifically includes the following steps:

[0083] (a) The process of feeding a composition containing HCC-140 and hydrogen fluoride into a first distillation column;

[0084] (b) The step of extracting an azeotropic composition containing HCC-140 and hydrogen fluoride as the first distillate, and extracting a composition having a concentration of either HCC-140 or hydrogen fluoride higher than that supplied in (a) as the bottom composition of the first distillation column; and

[0085] The process of supplying the first distillate to a second distillation column with different operating conditions for distillation, as required by (c).

[0086] In the above, the composition containing HCC-140 and hydrogen fluoride used as the starting composition in step (a) can be a composition consisting only of HCC-140 and hydrogen fluoride, or it can be a composition containing other components besides HCC-140 and hydrogen fluoride.

[0087] In the above, process (c) is not a necessary process, but a process that can be performed arbitrarily.

[0088] The separation method of the mixture containing HCC-140 and hydrogen fluoride of the present invention may be a method that includes only the above-described steps (a) to (c), or a method that includes steps other than those described in steps (a) to (c).

[0089] The operating conditions of the first and second distillation columns can be set appropriately.

[0090] The separation method of the present invention for a mixture containing HCO-1130(E) and hydrogen fluoride specifically includes the following steps:

[0091] (d) The process of feeding the composition containing HCO-1130(E) and hydrogen fluoride into the first distillation column;

[0092] (e) The step of extracting an azeotropic composition containing HCO-1130(E) and hydrogen fluoride as the first distillate, and extracting a composition having a concentration of either HCO-1130(E) or hydrogen fluoride higher than that supplied in (d) as the bottom composition of the first distillation column; and

[0093] The process of supplying the first distillate to a second distillation column with different operating conditions for distillation as required (f).

[0094] In the above, the composition containing HCO-1130(E) and hydrogen fluoride used as the starting composition in step (d) can be a composition consisting only of HCO-1130(E) and hydrogen fluoride, or it can be a composition that also contains components other than HCO-1130(E) and hydrogen fluoride.

[0095] In the above, process (f) is not a necessary process, but a process that can be performed arbitrarily.

[0096] The separation method of the mixture containing HCO-1130(Z) and hydrogen fluoride of the present invention may be a method that includes only the above-described steps (d) to (f), or a method that includes steps other than those described in steps (d) to (f).

[0097] The operating conditions of the first and second distillation columns can be set appropriately.

[0098] The separation method of the present invention for a mixture containing HCO-1130(Z) and hydrogen fluoride is a separation method comprising the following steps:

[0099] (g) The process of feeding a composition containing HCO-1130(Z) and hydrogen fluoride into a first distillation column;

[0100] (h) The step of extracting an azeotropic composition containing HCO-1130(Z) and hydrogen fluoride as the first distillate, and extracting a composition whose concentration of either HCO-1130(Z) or hydrogen fluoride is higher than that of the composition supplied in (g) as the bottom composition of the first distillation column; and

[0101] The process of supplying the first distillate to a second distillation column with different operating conditions for distillation as needed (i).

[0102] In the above, the composition containing HCO-1130(Z) and hydrogen fluoride used as the starting composition in step (g) can be a composition consisting only of HCO-1130(Z) and hydrogen fluoride, or it can be a composition that also contains components other than HCO-1130(Z) and hydrogen fluoride.

[0103] In the above, process (h) is not a mandatory process, but a process that can be performed arbitrarily.

[0104] The separation method of the mixture containing HCO-1130(Z) and hydrogen fluoride of the present invention may be a method that includes only the above-described steps (g) to (i), or a method that includes steps other than the above-described steps (g) to (i).

[0105] The operating conditions of the first and second distillation columns can be set appropriately.

[0106] The implementation methods have been described above, but it is understood that various changes can be made to the methods and details as long as they do not depart from the spirit and scope of the claims of this invention.

[0107] Example

[0108] The following examples provide a more detailed description. However, the present invention is not limited to these examples.

[0109] Example 1

[0110] The vapor-liquid equilibrium data of mixtures of HCC-140, HCO-1130(E) or HCO-1130(Z) with HF at 40°C are shown in Tables 1-3.

[0111] These data indicate that an azeotropic or azeotropic-like composition will be formed.

[0112] [Table 1]

[0113]

[0114] [Table 2]

[0115]

[0116] [Table 3]

[0117]

[0118] Example 2

[0119] Process for separating 1,1,2-trichloroethane (HCC-140), trans-1,2-dichloroethylene, and cis-1,2-dichloroethylene from hydrogen fluoride.

[0120] Figures 1-3 This illustrates an example of a distillation separation process using an azeotropic composition. Figure 1Table 4 illustrates an example of a process for separating HCC-140 from hydrogen fluoride. Flow rates for each liquid stream are expressed in kg / hr. The HCC-140 and hydrogen fluoride mixture is fed to distillation column C1 via S11. HCC-140 with a reduced hydrogen fluoride concentration is obtained via S12. The hydrogen fluoride-rich liquid stream obtained via S13 is then reused in the reaction process.

[0121] [Table 4]

[0122]

[0123] Figure 2 Table 5 illustrates an example of a process for separating HCO-1130(E) from hydrogen fluoride. The flow rates of each liquid stream are expressed in kg / hr. The HCO-1130(E) and hydrogen fluoride composition is fed to distillation column C2 via S21. The azeotropic composition of HCO-1130(E) and hydrogen fluoride is extracted via S23, and hydrogen fluoride with a reduced HCO-1130(E) concentration is obtained via S22. The hydrogen fluoride-rich liquid stream obtained via S22 is reused in the reaction process.

[0124] [Table 5]

[0125]

[0126] Figure 3 Table 6 illustrates an example of a process for separating HCO-1130(Z) from hydrogen fluoride. The flow rates of each liquid stream are expressed in kg / hr. The HCO-1130(Z) and hydrogen fluoride composition is fed to distillation column C3 via S31. The azeotropic composition of HCO-1130(Z) and hydrogen fluoride is extracted via S33, and hydrogen fluoride with a reduced HCO-1130(Z) concentration is obtained via S32. The hydrogen fluoride-rich stream obtained via S32 is reused in the reaction process.

[0127] [Table 6]

[0128]

[0129] For the azeotropic compositions of HCC-140 and hydrogen fluoride, HCO-1130(E) and hydrogen fluoride, and HCO-1130(Z) and hydrogen fluoride obtained by S12, S22 and S32, a decanter is used to reduce their temperature to a low level, thereby decreasing the solubility of HCC-140, HCO-1130(E) and HCO-1130(Z) relative to hydrogen fluoride. This allows for the preparation of compositions that are essentially composed of only hydrogen fluoride, and also enables the further recovery of hydrogen fluoride through absorption by H2SO4 and other means.

[0130] Furthermore, by forming an azeotropic composition, the composition becomes well-defined and can be directly reused in the reaction apparatus. This well-defined composition also facilitates process control, thus offering significant advantages.

Claims

1. An azeotropic or azeotropic-like composition, characterized in that: The composition is in a liquid phase and consists only of 1,1,2-trichloroethane (HCC-140) and hydrogen fluoride (HF), and additional compounds up to 1% by mass as needed. The additional compound is selected from 1-chloro-1,2,2-trifluoroethane (HCFC-133), 1-chloro-1,1,2-trifluoroethane (HCFC-133b), 2-chloro-1,1,1-trifluoroethane (HCFC-133a), 1,1-dichloro-2,2,2-trifluoroethane (HCFC-123), 1,1-difluoroethane (HFC-152a), 1,2-difluoroethane (HFC-152), fluoroethane (HFC-161), 1,1,1-trifluoroethane (HFC-143a), 1,1,1,2-tetrafluoroethane (HFC-134a), difluoromethane (HFC-32), pentafluoroethane (HFC- 125), one or more of the following: fluoromethane (HFC-41), dichlorofluoromethane (HFC-22), ethylene, propylene, acetylene, 1-chloro-1,2-difluoroethane (HCFC-142a), 2,3,3,3-tetrafluoropropylene (HFO-1234yf), 1,3,3,3-tetrafluoropropylene (HFO-1234ze), 1,2,3,3,3-pentafluoropropylene (HFO-1225ye), fluoroethylene (HCFO-1141), 1,1-difluoroethylene (HFO-1132a), 1-chloro-2,2-difluoroethylene (HCFO-1122), and 1-chloro-1,2-difluoroethylene (HCFO-1122a). The HF content is the amount effective for forming an azeotropic or azeotropic composition with HCC-140, relative to the total of the HF and HCC-140.

2. The azeotropic or azeotropic-like composition according to claim 1, characterized in that: The composition contains more than 10% by mass and less than 91% by mass of HCC-140 relative to the whole composition.

3. A method for separating a mixture containing HCC-140 and hydrogen fluoride, characterized in that, include: (a) The process of feeding a composition containing HCC-140 and hydrogen fluoride into a first distillation column; (b) The step of extracting an azeotropic composition containing HCC-140 and hydrogen fluoride as the first distillate, and extracting a composition of either HCC-140 or hydrogen fluoride at a concentration higher than that supplied in (a) as the bottom composition of the first distillation column; and The process of supplying the first distillate to a second distillation column with different operating conditions for distillation as required (c).

4. The separation method as described in claim 3, characterized in that: Distillation is carried out within a pressure range of 0.05 MPa to 1 MPa.

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