Method for separating 1-butene from etherified C4

Abstract

The invention relates to a method for separating 1-butene from etherified C4, in particular to the technical field of 1-butene refinement, and the method comprises the following steps: sequentially carrying out n-butane removal and iso-butane removal on etherified C4 to obtain 1-butene; the surface roughness Ra of the filler used in the n-butane removal is 720 to 800 [mu] m; and the surface roughness Ra of the filler used in the iso-butane removal is 720-800 [mu] m. According to the method provided by the invention, efficient separation of 1-butene from etherified C4 is realized by designing the separation process and selecting specific filler, and the energy consumption of the separation process is remarkably reduced on the premise of ensuring the separation effect.

Description

Technical Field

[0001] The invention relates to the technical field of 1-butene refining, and in particular to a method for separating 1-butene from post-ether C4. Background Art

[0002] At present, when separating 1-butene from the post-etherification C4 from the MTBE unit, the purity of 1-butene is required to be greater than 99.3% and the yield is about 95%. In addition to the target component 1-butene, the other components in the post-etherification C4 are mainly n-butane and isobutane. Due to differences in upstream raw materials and processes, the ratio of n-butane to isobutane varies from about 1:1 to 2:1 or even greater.

[0003] The existing process route of 1-butene separation device is to send the raw material ether and carbon four into the deisobutanizer tower to remove light components such as isobutane, and then send it into the 1-butene tower to remove heavy components such as normal butane, and obtain high-purity 1-butene product at the top of the 1-butene tower.

[0004] For example, CN216321828U discloses a system for producing 1-butene from post-ether C4, comprising a light removal tower, a heavy removal tower, a 2-butene isomerization reaction unit and an isomerization product separation tower connected in sequence, wherein the top of the isomerization product separation tower is connected to the inlet of the light removal tower, and the lower part of the isomerization product separation tower is connected to the inlet of the 2-butene isomerization reaction unit.

[0005] However, under the operating pressure of the existing process, the latent heat of vaporization of n-butane is about 7% greater than that of isobutane. When the content of n-butane in the carbon four after etherification is greater than that of isobutane, the existing process is not conducive to energy saving and also has the defects of low purity and yield of 1-butene product. Summary of the invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a method for separating 1-butene from carbon four after etherification, so as to solve the problem that when the content of n-butane in carbon four after etherification is greater than that of isobutane, the existing process is not conducive to energy saving and also has the defects of low purity and yield of 1-butene product.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] The present invention provides a method for separating 1-butene from post-ether C4, the method comprising:

[0009] The carbon four after the ether is sequentially subjected to n-butane removal and isobutane removal to obtain 1-butene;

[0010] The surface roughness Ra of the filler used in the n-butane removal is 720-800 μm;

[0011] The surface roughness Ra of the filler used in the isobutane removal is 720-800 μm.

[0012] The method provided by the present invention realizes efficient separation of 1-butene from post-ether C4 by designing the separation process and selecting specific fillers, and significantly reduces the energy consumption of the separation process while ensuring the separation effect.

[0013] As a preferred technical solution of the present invention, the filler used in the n-butane removal comprises a first filler group and a second filler group arranged alternately.

[0014] Preferably, the second filler group includes at least 5 second fillers arranged in sequence.

[0015] Preferably, the first filler comprises corrugations extending in wave lines along a horizontal plane, and the vertical spacing between adjacent wave crests and wave troughs in the waves is 4-8.4 cm.

[0016] Preferably, the first filler comprises corrugations extending in wave lines along a horizontal plane, and the horizontal spacing between adjacent wave crests and wave troughs in the waves is 15-20 cm.

[0017] Preferably, the second filler is a filler in which the corrugations extend along a horizontal plane in a fold line, and the top angle of the fold line is 100-120°.

[0018] As a preferred technical solution of the present invention, the total height of a single section of the filler used in the n-butane removal is less than 6m.

[0019] Preferably, the packing used in the n-butane removal comprises a perforated plate corrugated structured packing.

[0020] As a preferred technical solution of the present invention, the filler used in the isobutane removal includes a third filler and a fourth filler group arranged alternately.

[0021] Preferably, the fourth filler group includes at least 5 fourth fillers arranged in sequence.

[0022] Preferably, the third filler comprises corrugations extending in wave lines along a horizontal plane, and a vertical spacing between adjacent wave crests and wave troughs in the waves is 4-8.4 cm.

[0023] Preferably, the third filler comprises corrugations extending in wave lines along a horizontal plane, and a horizontal spacing between adjacent wave crests and wave troughs in the waves is 15-20 cm.

[0024] Preferably, the fourth filler is a filler in which the corrugations extend along a horizontal plane in a fold line, and the top angle of the fold line is 100-120°.

[0025] As a preferred technical solution of the present invention, the total height of a single section of the filler used in the isobutane removal is less than 6m.

[0026] Preferably, the packing used in the isobutane removal comprises a perforated plate corrugated structured packing.

[0027] As a preferred technical solution of the present invention, the specific surface area of ​​the filler used in the n-butane removal is greater than 250m 2 / m 3 ;

[0028] Preferably, the specific surface area of ​​the filler used in the isobutane removal is greater than 250 m 2 / m 3 .

[0029] Preferably, the inclination angle of the packing used in the n-butane removal is 90°.

[0030] Preferably, the inclination angle of the packing used in the isobutane removal is 90°.

[0031] As a preferred technical solution of the present invention, the tower top pressure in the n-butane removal is 0.6-0.7 MPa.

[0032] Preferably, the tower top temperature in the n-butane removal is 55-60°C.

[0033] As a preferred technical solution of the present invention, the bottom temperature of the tower during the n-butane removal is 65-70°C.

[0034] As a preferred technical solution of the present invention, the tower top pressure in the isobutane removal is 0.55-0.65 MPa.

[0035] Preferably, the tower top temperature in the isobutane removal is 50-54°C.

[0036] As a preferred technical solution of the present invention, the tower bottom temperature in the isobutane removal is 55-60°C.

[0037] Compared with the prior art solutions, the present invention has the following beneficial effects:

[0038] Under given material data, compared with the existing process of first sending the material to a deisobutanizer to remove light components such as isobutane, and then sending the material to a 1-butene tower to remove heavy components such as normal butane, the yield and product indicators of the present invention are improved to varying degrees, and the energy consumption of the device operation is significantly reduced. DETAILED DESCRIPTION

[0039] To better illustrate the present invention and facilitate understanding of the technical solution of the present invention, typical but non-limiting embodiments of the present invention are as follows:

[0040] This embodiment provides a method for separating 1-butene from post-ether C4, the method comprising:

[0041] The carbon four after the ether is sequentially subjected to n-butane removal and isobutane removal to obtain 1-butene;

[0042] The surface roughness Ra of the filler used in the n-butane removal is 720-800 μm;

[0043] The surface roughness Ra of the filler used in the isobutane removal is 720-800 μm.

[0044] In the present invention, the surface roughness Ra of the filler used in the n-butane removal is 720-800 μm, for example, it can be 720 μm, 730 μm, 740 μm, 750 μm, 760 μm, 770 μm, 780 μm, 790 μm or 800 μm, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0045] In the present invention, the surface roughness Ra of the filler used in the isobutane removal is 720-800 μm, for example, it can be 720 μm, 730 μm, 740 μm, 750 μm, 760 μm, 770 μm, 780 μm, 790 μm or 800 μm, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0046] Specifically, the packing used in the n-butane removal includes a first packing group and a second packing group arranged alternately.

[0047] In the present invention, the packing used in the n-butane removal includes alternately arranging the first packing and the second packing group, the height of the single-layer packing is 180-220 mm, and the packing section is formed in such a cycle, while ensuring that the beginning and end of the entire packing section are the first packing.

[0048] Specifically, the second filler group includes at least 5 second fillers arranged in sequence.

[0049] Specifically, the first filler includes corrugations extending in wave lines along a horizontal plane, and the vertical spacing between adjacent crests and troughs in the waves is 4-8.4 cm, for example, it can be 4 cm, 4.5 cm, 5 cm, 5.5 cm, 6 cm, 6.5 cm, 7 cm, 7.5 cm, 8 cm or 8.4 cm, etc., but is not limited to the listed values, and other values ​​not listed within the range also meet the requirements.

[0050] In the present invention, the vertical distance between adjacent crests and troughs in a wave is the sum of the height of the crest and the height of the trough.

[0051] Specifically, the first filler includes corrugations extending in wave lines along a horizontal plane, and the horizontal spacing between adjacent crests and troughs in the waves is 15-20 cm, for example, it can be 15 cm, 16 cm, 17 cm, 18 cm, 19 cm or 20 cm, etc., but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0052] In the present invention, the vertical distance between adjacent crests and troughs in a wave is the sum of the height of the crest and the height of the trough.

[0053] In the present invention, the horizontal spacing between adjacent crests and troughs in a wave is the distance between the highest point of the crest and the lowest point of the trough along the horizontal direction.

[0054] Specifically, the second filler is a filler in which the corrugations extend in a fold line along the horizontal plane, and the top angle of the fold line is 100-120°, for example, it can be 100°, 102°, 104°, 106°, 108°, 110°, 112°, 114°, 116°, 118° or 120°, but is not limited to the listed values, and other values ​​not listed within the range also meet the requirements.

[0055] Specifically, the total height of a single section of the packing used in the n-butane removal is less than 6m, for example, it can be 5.5m, 5m, 4m, 3m, 2m or 1m, etc., but is not limited to the listed values, and other unlisted values ​​within this range also meet the requirements.

[0056] Specifically, the packing used in the n-butane removal includes perforated plate corrugated structured packing.

[0057] Specifically, the packing used in the isobutane removal includes a third packing group and a fourth packing group which are alternately arranged.

[0058] In the present invention, the filler used in isobutane removal includes alternately arranging the third filler and the fourth filler group, the height of the single-layer filler is 180-220 mm, and the packing section is formed in such a cycle to ensure that the beginning and end of the entire packing section are the third filler.

[0059] Specifically, the fourth filler group includes at least 5 fourth fillers arranged in sequence.

[0060] Specifically, the third filler includes corrugations extending in wave lines along the horizontal plane, and the vertical spacing between adjacent crests and troughs in the waves is 4-8.4 cm, for example, it can be 4 cm, 4.5 cm, 5 cm, 5.5 cm, 6 cm, 6.5 cm, 7 cm, 7.5 cm, 8 cm or 8.4 cm, etc., but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0061] Specifically, the third filler includes corrugations extending in wave lines along the horizontal plane, and the horizontal spacing between adjacent crests and troughs in the waves is 15-20 cm, for example, it can be 15 cm, 16 cm, 17 cm, 18 cm, 19 cm or 20 cm, etc., but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0062] Specifically, the fourth filler is a filler in which the corrugations extend in a fold line along the horizontal plane, and the top angle of the fold line is 100-120°, for example, it can be 100°, 102°, 104°, 106°, 108°, 110°, 112°, 114°, 116°, 118° or 120°, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0063] Specifically, the total height of a single section of the packing used in the isobutane removal is less than 6m, for example, it can be 5.5m, 5m, 4m, 3m, 2m or 1m, etc., but is not limited to the listed values, and other unlisted values ​​within this range also meet the requirements.

[0064] Specifically, the packing used in the isobutane removal includes perforated plate corrugated structured packing.

[0065] Specifically, the specific surface area of ​​the filler used in the n-butane removal is greater than 250 m 2 / m 3 , for example, it can be 255m 2 / m 3 、300m 2 / m 3 、350m 2 / m 3 、400m 2 / m 3 、450m 2 / m 3 , 500m 2 / m 3 、550m 2 / m 3 or 600m 2 / m 3 The above values ​​are not limited to the above values. Other values ​​not listed in the above values ​​also meet the requirements.

[0066] Specifically, the specific surface area of ​​the filler used in the isobutane removal is greater than 250 m 2 / m 3 , for example, it can be 255m 2 / m 3 、300m 2 / m 3 、350m 2 / m 3、400m 2 / m 3 、450m 2 / m 3 、500m 2 / m 3 、550m 2 / m 3 or 600m 2 / m 3 The above values ​​are not limited to the above values. Other values ​​not listed in the above values ​​also meet the requirements.

[0067] Specifically, the inclination angle of the packing used in the n-butane removal is 90°.

[0068] Specifically, the inclination angle of the packing used in the isobutane removal is 90°.

[0069] Specifically, the top pressure in the n-butane removal is 0.6-0.7 MPa, for example, it can be 0.6 MPa, 0.61 MPa, 0.62 MPa, 0.63 MPa, 0.64 MPa, 0.65 MPa, 0.66 MPa, 0.67 MPa, 0.68 MPa, 0.69 MPa or 0.7 MPa, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0070] Specifically, the tower top temperature in the n-butane removal is 55-60°C, for example, it can be 55°C, 56°C, 57°C, 58°C, 59°C or 60°C, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0071] Specifically, the tower bottom temperature in the n-butane removal is 65-70°C, for example, it can be 65°C, 66°C, 67°C, 68°C, 69°C or 70°C, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0072] Specifically, the top pressure in the isobutane removal is 0.55-0.65 MPa, for example, it can be 0.55 MPa, 0.56 MPa, 0.57 MPa, 0.58 MPa, 0.59 MPa, 0.6 MPa, 0.61 MPa, 0.62 MPa, 0.63 MPa, 0.64 MPa or 0.65 MPa, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0073] Specifically, the tower top temperature in the isobutane removal is 50-54°C, for example, it can be 50°C, 51°C, 52°C, 53°C or 54°C, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0074] Specifically, the tower bottom temperature in the isobutane removal is 55-60°C, for example, it can be 55°C, 56°C, 57°C, 58°C or 59°C, but is not limited to the listed values, and other unlisted values ​​within the range also meet the requirements.

[0075] In the present invention, the packed tower used in the removal of normal butane and isobutane also includes auxiliary equipment commonly used in the art such as a liquid distributor, such as a liquid distributor is arranged between each section of the packing to ensure uniform distribution of the liquid phase.

[0076] Further, in order to illustrate that the method for separating 1-butene from post-ether C4 provided by the present invention can achieve good separation effect, the following practical examples are used for illustration, as follows:

[0077] Example 1

[0078] This embodiment provides a method for separating 1-butene from post-ether C4, the method comprising:

[0079] The carbon four after the ether is sequentially subjected to n-butane removal and isobutane removal to obtain 1-butene;

[0080] The mass percentage composition of the etherified C4 used is as follows:

[0081] Butene-1 34.5%, isobutane 24.3%, n-butane 24.3%, 2-butene 10%, and others 6.9%.

[0082] The surface roughness Ra of the filler used in the n-butane removal is 780 μm; the filler used in the n-butane removal includes a first filler and a second filler group arranged alternately; the second filler group is 5 second fillers arranged in sequence, and the height of a single layer of filler is 200 mm; the first filler includes corrugations extending along the horizontal plane in a wavy line, and the vertical spacing between adjacent wave crests and troughs in the wave is 5 cm; the first filler includes corrugations extending along the horizontal plane in a wavy line, and the horizontal spacing between adjacent wave crests and troughs in the wave is 18 cm; the second filler is a filler in which the corrugations extend along the horizontal plane in a broken line, and the top angle of the broken line is 110°;

[0083] The total height of a single section of the packing used in the n-butane removal is 5 m; the specific surface area of ​​the packing used in the n-butane removal is 350 m 2 / m 3 ; The inclination angle of the packing used in the n-butane removal is 90°; The tower top pressure in the n-butane removal is 0.65MPa; The tower top temperature in the n-butane removal is 57°C; The tower bottom temperature in the n-butane removal is 68°C;

[0084] The surface roughness Ra of the filler used in the isobutane removal is 750 μm; the filler used in the isobutane removal includes a third filler and a fourth filler group arranged alternately, the fourth filler group is 5 fourth fillers arranged in sequence, and the height of a single layer of filler is 200 mm; the third filler includes corrugations extending along a horizontal plane in a wavy line, and the vertical spacing between adjacent crests and troughs in the wave is 5 cm; the third filler includes corrugations extending along a horizontal plane in a wavy line, and the horizontal spacing between adjacent crests and troughs in the wave is 18 cm; the fourth filler is a filler in which the corrugations extend along a horizontal plane in a broken line, and the top angle of the broken line is 110°;

[0085] The total height of a single section of the packing used in the isobutane removal is 5 m; the specific surface area of ​​the packing used in the isobutane removal is 550 m 2 / m 3 ; The inclination angle of the packing used in the isobutane removal is 90°; The top pressure in the isobutane removal is 0.6MPa; The top temperature in the isobutane removal is 52°C; The bottom temperature in the isobutane removal is 57°C.

[0086] Example 2

[0087] This embodiment provides a method for separating 1-butene from post-ether C4, the method comprising:

[0088] The carbon four after the ether is sequentially subjected to n-butane removal and isobutane removal to obtain 1-butene;

[0089] The mass percentage composition of the etherified C4 used is as follows:

[0090] Butene-1 34.5%, isobutane 21.3%, n-butane 27.3%, 2-butene 10%, and others 6.9%.

[0091] The surface roughness Ra of the filler used in the n-butane removal is 750 μm; the filler used in the n-butane removal includes a first filler and a second filler group arranged alternately, the second filler group is 6 second fillers arranged in sequence, and the height of a single layer of filler is 210 mm; the first filler includes corrugations extending along a horizontal plane in a wavy line, and the vertical spacing between adjacent crests and troughs in the wave is 7 cm; the first filler includes corrugations extending along a horizontal plane in a wavy line, and the horizontal spacing between adjacent crests and troughs in the wave is 16 cm; the second filler is a filler in which the corrugations extend along a horizontal plane in a broken line, and the top angle of the broken line is 115°;

[0092] The total height of a single section of the packing used in the n-butane removal is 4m; the specific surface area of ​​the packing used in the n-butane removal is 450m 2 / m 3; The inclination angle of the packing used in the n-butane removal is 90°; The tower top pressure in the n-butane removal is 0.68MPa; The tower top temperature in the n-butane removal is 58°C; The tower bottom temperature in the n-butane removal is 66°C;

[0093] The surface roughness Ra of the filler used in the isobutane removal is 780 μm; the filler used in the isobutane removal includes a third filler and a fourth filler group arranged alternately, the fourth filler group is 6 fourth fillers arranged in sequence, and the height of a single layer of filler is 210 mm; the third filler includes corrugations extending along a horizontal plane in a wavy line, and the vertical spacing between adjacent crests and troughs in the wave is 7 cm; the third filler includes corrugations extending along a horizontal plane in a wavy line, and the horizontal spacing between adjacent crests and troughs in the wave is 16 cm; the fourth filler is a filler in which the corrugations extend along a horizontal plane in a broken line, and the top angle of the broken line is 115°;

[0094] The total height of a single section of the packing used in the isobutane removal is 4 m; the specific surface area of ​​the packing used in the isobutane removal is 450 m 2 / m 3 ; The inclination angle of the packing used in the isobutane removal is 90°; The top pressure in the isobutane removal is 0.62MPa; The top temperature in the isobutane removal is 53°C; The bottom temperature in the isobutane removal is 58°C.

[0095] Example 3

[0096] This embodiment provides a method for separating 1-butene from post-ether C4, the method comprising:

[0097] The carbon four after the ether is sequentially subjected to n-butane removal and isobutane removal to obtain 1-butene;

[0098] The mass percentage composition of the etherified C4 used is as follows:

[0099] Butene-1 34.5%, isobutane 20.3%, n-butane 28.3%, 2-butene 10%, and others 6.9%.

[0100] The surface roughness Ra of the filler used in the n-butane removal is 720 μm; the filler used in the n-butane removal includes a first filler and a second filler group arranged alternately, the second filler group is 5 second fillers arranged in sequence, and the height of a single layer of filler is 180 mm; the first filler includes corrugations extending along a horizontal plane in a wavy line, and the vertical spacing between adjacent crests and troughs in the wave is 8.4 cm; the first filler includes corrugations extending along a horizontal plane in a wavy line, and the horizontal spacing between adjacent crests and troughs in the wave is 15 cm; the second filler is a filler in which the corrugations extend along a horizontal plane in a broken line, and the top angle of the broken line is 100°;

[0101] The total height of a single section of the packing used in the n-butane removal is 5 m; the specific surface area of ​​the packing used in the n-butane removal is 350 m 2 / m 3 ; The inclination angle of the packing used in the n-butane removal is 90°; The tower top pressure in the n-butane removal is 0.6MPa; The tower top temperature in the n-butane removal is 60°C; The tower bottom temperature in the n-butane removal is 70°C;

[0102] The surface roughness Ra of the filler used in the isobutane removal is 720 μm; the filler used in the isobutane removal includes a third filler and a fourth filler group arranged alternately, the fourth filler group is 5 fourth fillers arranged in sequence, and the height of a single layer of filler is 180 mm; the third filler includes corrugations extending along a horizontal plane in a wavy line, and the vertical spacing between adjacent crests and troughs in the wave is 8.4 cm; the third filler includes corrugations extending along a horizontal plane in a wavy line, and the horizontal spacing between adjacent crests and troughs in the wave is 15 cm; the fourth filler is a filler in which the corrugations extend along a horizontal plane in a broken line, and the top angle of the broken line is 100°;

[0103] The total height of a single section of the packing used in the isobutane removal is 4 m; the specific surface area of ​​the packing used in the isobutane removal is 350 m 2 / m 3 ; The inclination angle of the packing used in the isobutane removal is 90°; the top pressure in the isobutane removal is 0.55 MPa; the top temperature in the isobutane removal is 50°C; the bottom temperature in the isobutane removal is 55°C.

[0104] Example 4

[0105] This embodiment provides a method for separating 1-butene from post-ether C4, the method comprising:

[0106] The carbon four after the ether is sequentially subjected to n-butane removal and isobutane removal to obtain 1-butene;

[0107] The mass percentage composition of the etherified C4 used is as follows:

[0108] Butene-1 34.5%, isobutane 26.3%, n-butane 30.3%, 2-butene 10%, and others 6.9%.

[0109] The surface roughness Ra of the filler used in the n-butane removal is 800 μm; the filler used in the n-butane removal includes a first filler and a second filler group arranged alternately, the second filler group is 7 second fillers arranged in sequence, and the height of a single layer of filler is 220 mm; the first filler includes corrugations extending along a horizontal plane in a wavy line, and the vertical spacing between adjacent crests and troughs in the wave is 4 cm; the first filler includes corrugations extending along a horizontal plane in a wavy line, and the horizontal spacing between adjacent crests and troughs in the wave is 20 cm; the second filler is a filler in which the corrugations extend along a horizontal plane in a broken line, and the top angle of the broken line is 120°;

[0110] The total height of a single section of the packing used in the n-butane removal is 5m; the specific surface area of ​​the packing used in the n-butane removal is 550m 2 / m 3 ; The inclination angle of the packing used in the n-butane removal is 90°; The tower top pressure in the n-butane removal is 0.7MPa; The tower top temperature in the n-butane removal is 55°C; The tower bottom temperature in the n-butane removal is 65°C;

[0111] The surface roughness Ra of the filler used in the isobutane removal is 800 μm; the filler used in the isobutane removal includes a third filler and a fourth filler group arranged alternately, the fourth filler group is 7 fourth fillers arranged in sequence, and the height of a single layer of filler is 220 mm; the third filler includes corrugations extending along a horizontal plane in a wavy line, and the vertical spacing between adjacent crests and troughs in the wave is 4 cm; the third filler includes corrugations extending along a horizontal plane in a wavy line, and the horizontal spacing between adjacent crests and troughs in the wave is 20 cm; the fourth filler is a filler in which the corrugations extend along a horizontal plane in a broken line, and the top angle of the broken line is 120°;

[0112] The total height of a single section of the packing used in the isobutane removal is 5.5 m; the specific surface area of ​​the packing used in the isobutane removal is 450 m 2 / m 3 ; The inclination angle of the packing used in the isobutane removal is 90°; the top pressure in the isobutane removal is 0.65MPa; the top temperature in the isobutane removal is 54°C; the bottom temperature in the isobutane removal is 60°C.

[0113] Example 5

[0114] The only difference from Example 1 is that the filler used in the n-butane removal is 200Y.

[0115] Example 6

[0116] The only difference from Example 1 is that the filler used in the isobutane removal is 200Y.

[0117] Example 7

[0118] The only difference from Example 1 is that the surface roughness Ra of the filler used in the n-butane removal is 500 μm.

[0119] Example 8

[0120] The only difference from Example 1 is that the surface roughness Ra of the filler used in the n-butane removal is 900 μm.

[0121] Example 9

[0122] The only difference from Example 1 is that the surface roughness Ra of the filler used in the isobutane removal is 500 μm.

[0123] Example 10

[0124] The only difference from Example 1 is that the surface roughness Ra of the filler used in the isobutane removal is 900 μm.

[0125] Embodiment 11

[0126] The only difference from Example 1 is that the specific surface area of ​​the filler used in the n-butane removal is 150 m 2 / m 3 .

[0127] Example 12

[0128] The only difference from Example 1 is that the specific surface area of ​​the filler used in the isobutane removal is 150 m 2 / m 3 .

[0129] Example 13

[0130] The only difference from Example 1 is that the tower top temperature is controlled at 54°C during n-butane removal.

[0131] Embodiment 14

[0132] The only difference from Example 1 is that the tower bottom temperature is controlled at 65°C during n-butane removal.

[0133] Embodiment 15

[0134] The only difference from Example 1 is that the tower top temperature is controlled at 56° C. during isobutane removal.

[0135] Example 16

[0136] The only difference from Example 1 is that the tower bottom temperature is controlled at 65° C. during isobutane removal.

[0137] The indicators and energy consumption of the 1-butene product obtained in the above examples are shown in Table 1 below.

[0138] Table 1

[0139] 1-Butene yield / % 1-Butene purity / % Total energy consumption / M·WATT Example 1 95.68 99.73 13.212 Example 2 96.69 99.69 13.112 Example 3 95.12 99.61 13.502 Example 4 95.13 99.79 13.322 Example 5 93.8 97.01 13.832 Example 6 94.01 97.05 13.812 Example 7 92.12 95.36 14.212 Example 8 93.31 94.63 14.354 Example 9 93.36 93.64 14.364 Example 10 91.03 94.43 14.873 Embodiment 11 90.21 82.02 13.882 Example 12 90.26 81.01 13.612 Example 13 95.03 99.71 13.812 Embodiment 14 95.02 99.69 13.842 Embodiment 15 95.23 99.21 13.792 Example 16 95.21 99.23 13.822

[0140] As can be seen from Table 1, in the solution provided by the present invention, the separation effect of 1-butene is ensured by controlling the parameters and operating parameters of the filler used in the separation process. Among them, the surface roughness in the present invention affects the theoretical plate efficiency of the filler, and other parameters and operating parameters are combined to improve the quality of the product and reduce energy consumption.

[0141] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0142] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0143] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for separating 1-butene from post-ether C4, characterized in that: The method comprises: The carbon four after the ether is sequentially subjected to n-butane removal and isobutane removal to obtain 1-butene; The surface roughness Ra of the filler used in the n-butane removal is 720-800 μm; The surface roughness Ra of the filler used in the isobutane removal is 720-800 μm.

2. The method according to claim 1, characterized in that The packing used in the n-butane removal comprises a first packing and a second packing group arranged alternately; Preferably, the second filler group includes at least 5 second fillers arranged in sequence; Preferably, the first filler comprises corrugations extending in a wave line along a horizontal plane, and the vertical spacing between adjacent crests and troughs in the waves is 4-8.4 cm; Preferably, the first filler comprises corrugations extending in a wave line along a horizontal plane, and the horizontal spacing between adjacent crests and troughs in the waves is 15-20 cm; Preferably, the second filler is a filler in which the corrugations extend along a horizontal plane in a fold line, and the top angle of the fold line is 100-120°.

3. The method according to claim 1 or 2, characterized in that The total height of a single section of the packing used in the n-butane removal is less than 6m; Preferably, the packing used in the n-butane removal comprises a perforated plate corrugated structured packing.

4. The method according to any one of claims 1 to 3, characterized in that: The packing used in the isobutane removal comprises a third packing and a fourth packing group arranged alternately; Preferably, the fourth filler group includes at least 5 fourth fillers arranged in sequence; Preferably, the third filler comprises corrugations extending in a wave line along a horizontal plane, and the vertical spacing between adjacent crests and troughs in the waves is 4-8.4 cm; Preferably, the third filler comprises corrugations extending in a wave line along a horizontal plane, and the horizontal spacing between adjacent crests and troughs in the waves is 15-20 cm; Preferably, the fourth filler is a filler in which the corrugations extend along a horizontal plane in a fold line, and the top angle of the fold line is 100-120°.

5. The method according to any one of claims 1 to 4, characterized in that: The total height of a single section of the packing used in the isobutane removal is less than 6m; Preferably, the packing used in the isobutane removal comprises a perforated plate corrugated structured packing.

6. The method according to any one of claims 1 to 5, characterized in that: The specific surface area of ​​the filler used in the n-butane removal is > 250m 2 / m 3 ; Preferably, the specific surface area of ​​the filler used in the isobutane removal is greater than 250 m 2 / m 3 ; Preferably, the inclination angle of the packing used in the n-butane removal is 90°; Preferably, the inclination angle of the packing used in the isobutane removal is 90°.

7. The method according to any one of claims 1 to 6, characterized in that: The tower top pressure in the n-butane removal is 0.6-0.7MPa; Preferably, the tower top temperature in the n-butane removal is 55-60°C.

8. The method according to any one of claims 1 to 7, characterized in that: The tower bottom temperature in the n-butane removal is 65-70°C.

9. The method according to any one of claims 1 to 8, characterized in that The tower top pressure in the isobutane removal is 0.55-0.65MPa; Preferably, the tower top temperature in the isobutane removal is 50-54°C.

10. The method according to any one of claims 1 to 9, characterized in that: The tower bottom temperature in the isobutane removal is 55-60°C.