A non-low temperature separation test device for alkane systems

Abstract

This invention discloses a non-low-temperature separation testing device for alkane systems. The gas separation stage module includes at least n gas separation stages, with the last separation stage being separation stage S-n. The n gas separation stages are connected in series. The inlet of the first separation stage is connected to the outlet of the feed gas compressor, the inlet of the feed gas compressor is connected to the outlet of the feed gas diaphragm valve, and the inlet of the feed gas diaphragm valve is connected to the feed gas source. The molar concentration analysis module includes n component gas molar concentration measurement ports. The outlets of the n gas separation stages are respectively connected to the inlets of the component gas molar concentration measurement ports in the molar concentration analysis module. It can determine the total separation coefficient under different target component molar concentrations by measuring the target component gas molar concentration at the outlet of the separation stage.

Description

Technical Field

[0001] This invention relates to a separation testing device, and more specifically, to a non-low-temperature separation testing device for alkane systems, belonging to the field of industrial chemical engineering. Background Technology

[0002] Currently, there are two main types of gas separation methods used in industry: cryogenic and non-cryogenic methods. Non-cryogenic methods are a relatively new gas separation technique that emerged in the 1990s. Compared to cryogenic distillation, non-cryogenic methods offer advantages such as faster response times, operation at room temperature, more compact equipment, higher separation coefficients between different gas components, and greater suitability for separating precision systems. They are now widely used across various industries. However, evaluating the separation effectiveness of non-cryogenic methods (or accurately determining the separation coefficient α') often relies on the personal experience of technicians or agreed-upon rules within the industry, and a superior separation testing device is still lacking. Summary of the Invention

[0003] To address the aforementioned problems in the prior art, this invention provides a non-low-temperature separation testing device for alkane systems, which features the ability to determine the homogenized separation coefficient α' under different target component molar concentrations by calculating the molar concentration of the target component gas at the outlet of the set separation stage.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0005] The present invention provides a non-low-temperature separation and testing device for alkane systems, comprising a gas separation stage module and a molar concentration analysis module connected to the gas separation stage module;

[0006] The gas separation stage module includes at least n gas separation stages, with the last separation stage being separation stage Sn. The n gas separation stages are connected in series, where n is a positive integer greater than or equal to 1. The inlet of the first separation stage is connected to the outlet of the raw material gas compressor, the inlet of the raw material gas compressor is connected to the outlet of the raw material gas diaphragm valve, and the inlet of the raw material gas diaphragm valve is connected to the raw material gas source.

[0007] The molar concentration analysis module II includes n component gas molar concentration measurement ports, where n is a positive integer greater than or equal to 1;

[0008] The outlets of the n gas separation stages are respectively connected to the inlets of the component gas molar concentration measurement ports in the molar concentration analysis module II, so as to enable the molar concentration analysis module to measure the molar concentration of the target component in the outlet concentrate of the n gas separation stages.

[0009] Preferably, the gas separation stage module includes at least gas separation stage S-1 (hereinafter referred to as separation stage S-1), gas separation stage S-2, and gas separation stage S-3, and the molar concentration analysis module II includes at least component gas molar concentration measurement port E-1, component gas molar concentration measurement port E-2, and component gas molar concentration measurement port E-3.

[0010] The inlet of separation stage S-1 is connected to the outlet of raw material gas compressor 2, the outlet of separation stage S-1 is connected to the inlet of separation stage S-2, the outlet of separation stage S-2 is connected to the inlet of separation stage S-3, and the outlets of gas separation stages S-1, S-2, and S-3 are respectively connected to the inlets of component gas molar concentration measuring ports E-1, E-2, and E-3.

[0011] Preferably, in the molar concentration analysis module II, a portion of the outlet gas from the component gas molar concentration measurement port flows back to the inlet of the raw material gas compressor 2, while the other portion of the outlet gas from the component gas molar concentration measurement port can flow back to the inlet of any separation stage in the gas separation stage module I.

[0012] Preferably, the outlet gases from the molar concentration measurement ports of m component gases in the molar concentration analysis module II flow back to the inlet of the raw material gas compressor 2 after passing through the molar concentration analysis module. The outlet gases from the molar concentration measurement ports of n-x+1 component gases in the molar concentration analysis module II can flow back to the inlet of any separation stage in the gas separation stage module I. Here, m is a positive integer greater than 1 and less than x, and x is a positive integer greater than m and less than n.

[0013] The gas from the m component gas molar concentration measuring ports returns to the inlet of the raw material compressor 2 after passing through the molar concentration analysis module II. The gas from the component gas molar concentration measuring ports Ex to En returns to the inlet of any separation stage in the bulk separation stage after passing through the molar concentration analysis module II.

[0014] Preferably, it also includes a differential separation stage analysis module III, wherein the gas separation stage module III and the differential separation stage analysis module are connected to realize the analysis of any one of the n gas separation stages;

[0015] The system can calculate the target component gas molar concentration at the n component gas molar concentration measurement port, and combine the target component gas molar concentration z at the S inlet and the target component gas molar concentration y at the S outlet in the differential separation stage analysis module III, as well as the homogenization yield θ of the target component gas from the system feed gas inlet to the outlet of any separation stage, and finally determine the homogenization separation coefficient α' from the system feed gas inlet to the outlet of any separation stage.

[0016] Calculation formula {A}:

[0017]

[0018] Explanation of {A}:

[0019] The entire adsorption process of the device of the present invention is conceived as several separation units, namely: S-1, S-2, S-3, etc., up to Sn; for a certain separation stage S, the raw gas comes from the previous separation unit.

[0020] A feed M' (abundance y') to a first-stage separation unit is concentrated into a concentrate M (abundance y). Here, ΔN' represents the waste discharged after passing through the first-stage separation unit. Since ΔN' is extremely small, it can be written as dN' based on differential relationships. Clearly, the decrease in feed M' by ΔM' (similar to ΔN', ΔM' can be written as dM') after passing through the first-stage separation unit should be equal to the increase in discharged waste by dN'. ΔM' = -ΔM' indicates that feed M' decreases while discharged waste ΔN' increases. x' represents the volume concentration (molar concentration) of the discharged waste after passing through the first-stage separation unit, x'dN' represents the molar amount of the target component in the discharged waste after passing through the first-stage separation unit, and d(y'M') represents the increase in the molar amount of the target component after passing through the first-stage separation unit. The two are opposite in nature, with one increasing and the other decreasing, and their absolute amounts are equal. Starting from the inlet of the first separation stage S-1 to the outlet of a certain separation stage (feed F (target component molar concentration z), outlet product M (target component molar concentration y), the calculation formula {A} can be obtained. Calculation formula {B}:

[0021]

[0022] Explanation of {B}:

[0023] It is assumed that the feed gas travels slowly in each separation stage, thus the molar concentration y' of the concentrated stream and the molar concentration x' of the lean stream are in equilibrium. The calculation formula {B} can be obtained from the distillation separation theory.

[0024] Calculation formula {C}:

[0025]

[0026] Explanation of {C}:

[0027] In {C}, F is the inlet feed of the first separation stage S-1, and M is the outlet product of a certain stage; z is the molar concentration of the target component in F, and y is the molar concentration of the target component in M. Combining calculation formulas {A} and {B} yields the quantitative relationship between F, M, x, y, and the total separation coefficient α'.

[0028] Calculation formula {D}:

[0029]

[0030] Explanation of {D}:

[0031] By performing a mathematical transformation on the calculation formula {C}, we obtain another form of the calculation formula {D}. In {D}, θ is the homogenized yield from the inlet of the first separation stage S-1 to the outlet M of a certain stage.

[0032] Beneficial effects: By calculating the molar concentration of the target component gas at the outlet of the separation stage, the homogenized separation coefficient α' under different target component molar concentrations can be determined. This allows for a deeper understanding of the differences in adsorption characteristics of difficult-to-separate systems when they have different component compositions, providing core technical support for the design of efficient non-low-temperature difficult-to-separate system separation and purification systems. Attached Figure Description

[0033] Figure 1 This is a block diagram illustrating the principle of the present invention.

[0034] Figure 2 This is a schematic diagram of the differential separation stage analysis principle of the present invention. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.

[0036] like Figure 1-2 The illustration shows a specific embodiment of a non-low-temperature separation testing device for alkane systems. This embodiment of a non-low-temperature separation testing device for alkane systems determines the total separation coefficient α' under different target component molar concentrations by calculating the molar concentration of the target component gas at the outlet of the separation stage.

[0037] Gas separation stage module I:

[0038] Gas separation stage module I describes the connection relationship between the various separation stages of the separation device. The entire separation process is divided into several independent separation stages (S-1, S-2, ..., Sn), and the feed gas concentrated in the previous separation stage is used as the feed gas for the next separation stage.

[0039] Module II for Molar Concentration Analysis:

[0040] The molar concentration analysis module II is used to analyze the molar concentration of each component in the effluent of each separation stage (S-1, S-2, ..., Sn) in the gas separation stage module (I). In this invention, a small portion of the effluent from each separation stage is taken to the molar concentration analysis module II to analyze the molar concentration of the components at each stage. After analysis, the gas from E-1 to Em is merged into R-1 and then returned to the feed compressor inlet; Ex to En is merged into Rx and then returned to the inlet of a specific separation stage.

[0041] Differential Separation Level Analysis Module III:

[0042] This paper explains the microscopic mechanism of a single separation stage in Gas Separation Stage Module I. Calculation formulas {A}, {B}, and {C} are used to present the quantitative relationships between F, M, x, y, and the homogenization separation coefficient α'. Calculation formula {D} clearly expresses the quantitative correlation between the inlet molar concentration z of the first separation stage S-1, the outlet molar concentration y of a certain stage product, and the homogenization yield θ from the inlet of the first separation stage S-1 to the outlet of a certain stage.

[0043] Specifically, the gas separation stage module I of this invention includes gas separation stages S-1, S-2, S-3, and up to separation stage Sn. The outlets of the different gas separation stages are all connected to a molar concentration analysis module II. The molar concentration analysis module II includes component gas molar concentration measurement ports E-1, E-2, E-3, and up to En. The molar concentration analysis module II is used to determine the molar concentration of the target component in the concentrate at the outlet of separation stages S-1, S-2, S-3, and up to Sn. Specifically, component gas molar concentration measurement ports E-1, E-2, E-3, and up to En are used to measure the molar concentration of the target component. After passing through the molar concentration measurement ports E-2, E-3, and Em, the gas returns to the inlet of the feed compressor 2. After passing through the molar concentration measurement ports Ex and En, the gas returns to the inlet of any separation stage. By calculating the target component gas molar concentration at the component gas molar concentration measurement ports E-1, E-2, E-3, and En, and combining the target component gas molar concentration z at the S inlet, the target component gas molar concentration y at the S outlet, and the homogenization yield θ of the target component gas from the feed gas inlet to the S stage outlet in the differential separation stage analysis module III, the homogenization separation coefficient α' from the feed gas inlet to the S stage outlet is obtained.

[0044] Calculation formula {A}:

[0045]

[0046] Explanation of {A}:

[0047] The entire adsorption process of the device of this invention is conceived as several separation units, namely: S-1, S-2, S-3, ..., Sn; for a certain separation stage S, the feed gas comes from the previous separation unit. A certain separation unit is a certain separation stage.

[0048] A feed M' (abundance y') to a first-stage separation unit is concentrated into a concentrate M (abundance y). Here, ΔN' represents the waste discharged after passing through the first-stage separation unit. Since ΔN' is extremely small, it can be written as dN' based on differential relationships. Clearly, the decrease in feed M' by ΔM' (similar to ΔN', ΔM' can be written as dM') after passing through the first-stage separation unit should be equal to the increase in discharged waste by dN'. ΔM' = -ΔM' indicates that feed M' decreases while discharged waste ΔN' increases. x' represents the volume concentration (molar concentration) of the discharged waste after passing through the first-stage separation unit, x'dN' represents the molar amount of the target component in the discharged waste after passing through the first-stage separation unit, and d(y'M') represents the increase in the molar amount of the target component after passing through the first-stage separation unit. The two are opposite in nature, with one increasing and the other decreasing, and their absolute amounts are equal. Starting from the inlet of the first separation stage S-1 to the outlet of a certain separation stage (feed F (target component molar concentration z), outlet product M (target component molar concentration y), the calculation formula {A} can be obtained. Calculation formula {B}:

[0049]

[0050] Explanation of {B}:

[0051] It is assumed that the feed gas travels slowly in each separation stage, thus the molar concentration y' of the concentrated stream and the molar concentration x' of the lean stream are in equilibrium. The calculation formula {B} can be obtained from the distillation separation theory.

[0052] Calculation formula {C}:

[0053]

[0054] Explanation of {C}:

[0055] In {C}, F is the inlet feed of the first separation stage S-1, and M is the outlet product of a certain stage; z is the molar concentration of the target component in F, and y is the molar concentration of the target component in M. Combining calculation formulas {A} and {B} yields the quantitative relationship between F, M, x, y, and the total separation coefficient α'.

[0056] Calculation formula {D}:

[0057]

[0058] Explanation of {D}:

[0059] By performing a mathematical transformation on the calculation formula {C}, we obtain another form of the calculation formula {D}. In {D}, θ is the homogenized yield from the inlet of the first separation stage S-1 to the outlet M of a certain stage.

[0060] Compared to the calculation formula {C}, the calculation formula {D} clearly expresses the quantitative relationship between the molar concentration z of the feed at the inlet of the first separation stage S-1, the molar concentration y of the product at the outlet of a certain stage, and the homogenized yield θ from the inlet of the first separation stage S-1 to the outlet of a certain stage.

[0061] By measuring the target component gas molar concentration at different component gas molar concentration measuring ports E-1, E-2, E-3, and finally Em at the outlet, the actual homogenization separation coefficient α' of the raw gas with different concentrations can be obtained. This allows for a deeper understanding of the differences in adsorption characteristics of difficult-to-separate systems with different component compositions when passing through the adsorbent, providing core technical support for the design of efficient non-low-temperature difficult-to-separate system separation and purification systems.

[0062] Operating procedure: Before system startup, the entire apparatus pipeline must be purged with purging gas (generally high-purity nitrogen (pressure ~500 kPa(G)), but not limited to, and may also include compressed air, high-purity argon, etc.) for 6-8 hours to maintain the cleanliness of the system pipeline. During the purging process, the system should be evacuated once every 2 hours, ensuring that the vacuum level at each point in the system pipeline does not exceed 10 Pa each time.

[0063] After the system is purged, it is evacuated again to ensure that the vacuum level at all points in the system pipeline does not exceed 10 Pa. Once the air in the system pipeline is replaced, the system is started.

[0064] Operating Procedure: Slowly open the feed gas diaphragm valve 1 and start the feed gas compressor 2. The feed gas begins to enter the gas separation stage module I of the system. The feed gas sequentially passes through separation stages S-1, S-2, S-3, and finally Sn, achieving separation between the feed gas components. The concentrated gas at the outlet of separation stage Sn is collected. Component molar concentration measurement ports E-1, E-2, E-3, and finally En are respectively installed at the outlets of separation stages S-1, S-2, S-3, and finally Sn. The outlet gas from separation stages S-1, S-2, S-3, and finally Sn is introduced into the molar concentration analysis module II through the component molar concentration measurement ports E-1, E-2, E-3, and finally En. Component analysis of the outlet gas from separation stages S-1, S-2, S-3, and finally Sn is performed in the molar concentration analysis module II.

[0065] In this invention, a weakly adsorbed component (molar concentration y) is used as the target component. This allows for a quantitative analysis of the relationship between the molar concentration y of the target component at the outlet of a single separation stage S in separation stage module I, the molar concentration z of the system feed gas (feed gas inlet of separation stage module I), the homogenized separation coefficient α' of the system feed gas (separation stage module I) from the inlet to the outlet of a single separation stage S, and the homogenized yield θ of the system feed gas (separation stage module I) from the inlet to the outlet of a single separation stage S.

[0066] This invention specifically analyzes the variation characteristics of the molar concentration of the feed gas components from the inlet of the system feed gas (separation stage module I) to the outlet of a single separation stage S (target molar concentration y of a single separation stage S outlet in separation stage module I, molar concentration z of the system feed gas (feed gas inlet of separation stage module I), homogenized separation coefficient α' of the system feed gas (separation stage module I) from the inlet to the outlet of a single separation stage S, and homogenized yield θ of the system feed gas (separation stage module I) from the inlet to the outlet of a single separation stage S).

[0067] In separation stages S-1, S-2, S-3, and up to Sn, within a very short time interval (ΔN', x') during the adsorption process of each separation stage, the molar concentration of the target component is considered to be in two-phase equilibrium. That is, the molar concentration x' of the weakly adsorbed component in the adsorbent and the molar concentration y' of the unadsorbed gas in the separation stage are in phase equilibrium, specifically denoted as {B}. ΔN' represents the waste material discharged after passing through a certain separation unit.

[0068] In each separation stage adsorption process, within a very short time period, based on the conservation of the molar amount of the target component (the weakly adsorbed component is the target component in this invention description), the differential relationship between the target component flow rate M' and the molar concentration x' of the weakly adsorbed component in the adsorbent and the molar concentration y' of the weakly adsorbed component in the unadsorbed gas is obtained. Based on this, the mathematical relationship between the three is quantified by integration, specifically expressed as {A}.

[0069] Combining {A} and {B}, the essential quantitative relationship between the system feed gas flow rate F, the outlet flow rate M of a certain separation stage, the system feed gas (molar concentration z, the homogenized separation coefficient α' from the system feed gas inlet to the outlet S of a certain separation stage, and the homogenized yield θ from the system feed gas inlet to the outlet S of a certain separation stage), and the target component molar concentration y at the outlet S of a certain separation stage in the gas separation stage module (I) is finally clarified and specifically expressed as {C}. At the same time, {C} can be equivalently expressed as {D}.

[0070] Formula {A}: Formula {A} gives the integral from the inlet of the first separation stage S-1 to the outlet of a certain separation stage, that is, the quantitative relationship between the feed F (target component molar concentration z) and the outlet product M (target component molar concentration y).

[0071] A feed M' (abundance y') to a first-stage separation unit is concentrated into a concentrate M (abundance y). Here, ΔN' represents the waste discharged after passing through the first-stage separation unit. Since ΔN' is extremely small, it can be written as dN' based on differential relationships. Clearly, the decrease in feed M' by ΔM' (similar to ΔN', ΔM' can be written as dM') after passing through the first-stage separation unit should be equal to the increase in discharged waste by dN'. ΔM' = -ΔM' indicates that feed M' decreases while discharged waste ΔN' increases. x' represents the volume concentration (molar concentration) of the discharged waste after passing through the first-stage separation unit, x'dN' represents the molar amount of the target component in the discharged waste after passing through the first-stage separation unit, and d(y'M') represents the increase in the molar amount of the target component after passing through the first-stage separation unit. The two are opposite in nature, with one increasing and the other decreasing, and their absolute amounts are equal.

[0072] Formula {B}: Based on the theoretical foundation of distillation separation, it is assumed that when the feed gas travels slowly in each separation stage, the molar concentration y' of the concentrated stream and the molar concentration x' of the lean stream are approximately in two-phase equilibrium. The mathematical relationship is expressed as the calculation formula {B}.

[0073] Formula C: By combining formulas A and B, the quantitative relationship between F, M, x, y, and the total separation coefficient α' is obtained. Where F is the inlet feed of the first separation stage S-1, M is the outlet product of a certain stage; z is the molar concentration of the target component in F, and y is the molar concentration of the target component in M.

[0074] Formula {D}: By mathematically transforming formula {C}, we obtain another form of formula {C}, formula {D}. In {D}, θ is the homogenized yield from the inlet of the first separation stage S-1 to the outlet M of a certain stage. Compared to formula {C}, in formula {D}...

[0075] Through the molar concentration analysis module II, the molar concentration z of the system feed gas, the molar concentration y of the target component at the outlet of a certain separation stage S in separation stage module I, and the homogenized yield θ from the system feed gas inlet to the outlet of a certain separation stage S can all be determined. Based on {D}, the homogenized separation coefficient α' from the system feed gas inlet to the outlet of a certain separation stage S can be calculated.

[0076] The system feed gas flow rate should not exceed 0.7–0.8 m / s to ensure that the molar concentrations x' of the weakly adsorbed component in the adsorbent and y' of the weakly adsorbed component in the unadsorbed gas are sufficiently close to the phase equilibrium state. This results in a high-confidence homogenized separation coefficient α' from the system feed gas inlet to the outlet of a specific separation stage S.

[0077] This invention can determine the homogenized separation coefficient α' under different target component molar concentrations by calculating the molar concentration of the target component gas at the outlet of the separation stage.

[0078] Finally, it should be noted that the present invention is not limited to the above embodiments, and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A non-low-temperature separation and testing device for alkane systems, characterized in that: It includes a gas separation stage module (I) and a molar concentration analysis module (II) connected to the gas separation stage module (I); The gas separation stage module (I) includes at least n gas separation stages, with the last separation stage being separation stage Sn. The n gas separation stages are connected in series, where n is a positive integer greater than or equal to 1. The inlet of the first separation stage is connected to the outlet of the raw material gas compressor (2), the inlet of the raw material gas compressor (2) is connected to the outlet of the raw material gas diaphragm valve (1), and the inlet of the raw material gas diaphragm valve (1) is connected to the raw material gas source. The molar concentration analysis module (II) includes n component gas molar concentration measurement ports, where n is a positive integer greater than or equal to 1; The outlets of the n gas separation stages are respectively connected to the inlet of the component gas molar concentration measurement port in the molar concentration analysis module (II) so that the molar concentration analysis module (II) can measure the target component gas molar concentration in the outlet concentrate of the n gas separation stages. It also includes a differential separation stage analysis module (Ⅲ), wherein the gas separation stage module (I) is connected to the differential separation stage analysis module (Ⅲ) to realize the analysis of any separation stage among n gas separation stages; The system can calculate the target component gas molar concentration at the measuring port of any separation stage component gas, and combine it with the target component gas molar concentration z at the feed gas inlet of any separation stage and the target component gas molar concentration y at the product outlet of any separation stage in the differential separation stage analysis module (Ⅲ), and the homogenization yield θ of the target component gas from the feed gas inlet of the system to the outlet of any separation stage, and finally determine the homogenization separation coefficient α' from the feed gas inlet of the system to the outlet of any separation stage. The process of obtaining the homogenized separation coefficient α' is as follows: Calculation formula: {A} ； Formula {A} is from the first separation level S -1 import integral from any first separation stage export integral; In formula {A}: Δ N 'The waste material discharged after passing through any one stage of separation unit, due to Δ N 'Minimum, based on differential relations, Δ can be...' N 'written as dN '; Feeding to any primary separation unit M The decrease Δ M 'The increase in the amount of waste discharged' dN ',Δ M '=-Δ N 'Indicates the feed of any first-stage separation unit' M 'Reduce, and the discharged waste Δ N 'Increase; y ' represents the molar concentration of the concentrate stream. After concentration by any first-stage separation unit, the molar flow rate M of the concentrate output from any first-stage separation unit and the molar concentration y of the target component gas in the outlet product are obtained. M 'Indicates feeding into any primary separation unit; x ' is the molar concentration of the lean feed stream; x ' dN ' is the molar amount of the target component in the waste material discharged after passing through any first-stage separation unit; d ( y ' M ') is the feed for any first-stage separation unit. M The increase in the number of moles of the target component after any first-level separation unit is equal in absolute quantity, with one increasing and the other decreasing. F is the total molar flow rate of the material at the inlet of the first separation stage S-1; Calculation formula: {B}: ; In formula {B}: y 'Indicates the molar concentration of the concentrate stream, x ' represents the molar concentration of the lean feed stream; α' is the homogenization separation coefficient; Calculation formula: {C}: ; In formula {C}, F represents the total molar flow rate of the material at the inlet of the first separation stage S-1. M The molar flow rate of the concentrated output from any primary separation unit; z The target molar concentration of the raw gas inlet. y To determine the target component molar concentration of the exported product, formulas {A} and {B} are combined to obtain... F , M , x , y and homogenized separation coefficient α’ The quantitative relationship between them; Calculation formula: {D}: ; In formula {D}: θ The homogenization yield of the target component gas from the system feed gas inlet to the outlet of any separation stage.

2. The non-low-temperature separation and testing device for alkane systems according to claim 1, characterized in that: In the molar concentration analysis module (II), a portion of the component gas molar concentration measurement port outlet gas flows back to the inlet of the raw material gas compressor (2), while the other portion of the component gas molar concentration measurement port outlet gas can flow back to the inlet of any separation stage in the gas separation stage module (I).

3. The non-low-temperature separation and testing device for alkane systems according to claim 2, characterized in that: The outlet gas from the molar concentration measurement ports of m component gases in the molar concentration analysis module (II) flows back to the inlet of the raw material gas compressor (2) after passing through the molar concentration analysis module (II). The outlet gas from the molar concentration measurement ports of n-x+1 component gases in the molar concentration analysis module (II) can flow back to the inlet of any separation stage in the gas separation stage module (I). m is a positive integer greater than 1 and less than x. x is a positive integer greater than m and less than n. The gas from the molar concentration measurement ports of m components passes through the molar concentration analysis module (II) and returns to the inlet of the raw material gas compressor (2). The gas from the molar concentration measurement ports of component components Ex to En passes through the molar concentration analysis module (II) and returns to the inlet of any separation stage in the gas separation stage module (I).

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