A pretreatment device for mixed carbon three produced by ethane cracking

Abstract

The application discloses a kind of mixed carbon three pretreatment device for ethane cracking production, belong to chemical technology production field, including first dryer and second dryer, second dryer is provided with liquid level meter b, first dryer and second dryer are respectively connected with pipeline e and pipeline f, online water content analyzer is connected between pipeline e and pipeline f, pipeline g is connected between pipeline e and pipeline f, regeneration device is provided on pipeline g, light component is provided in regeneration device, mixed device is connected between pipeline e and pipeline f, reaction device is connected on mixed device, while drying and regenerating drying agent in dryer, it guarantees the continuous water removal of mixed carbon three liquid material, while drying drying agent, light component remaining in dryer does not affect mixed carbon three liquid material entering dryer next time, also make mixed carbon three liquid material discharged when drying agent is regenerated in dryer be recycled and immediately carry out dehydrating operation again.

Description

TECHNICAL FIELD

[0001] The present application relates to the chemical technology field, specifically to a kind of mixed carbon three's pretreatment device in ethane cracking production. BACKGROUND

[0002] In production system, mixed carbon three raw material is derived from the deethanizer kettle in ethane cracking device, this part of material contains a certain proportion of water, propyne, propadiene component, this part of impurity is extremely harmful to carbon three hydrogenation catalyst, and extremely easy to cause reactor temperature runaway, reduce catalyst activity and service life. To completely remove the influence of this part of impurity to carbon three hydrogenation reactor, mixed carbon three raw material needs to be pretreated, and water, propyne, propadiene and other impurity components in raw material are removed, wherein dryer is needed in water removal process, and interlayer is arranged in dryer, and drying agent is placed in interlayer, and water in mixed carbon three liquid material is absorbed by drying agent when passing through drying agent, to achieve the purpose of water removal, but after drying agent adsorption saturation, to enable it to continue to use, it needs to be regenerated, and existing technology is dried by heating air, but mixed carbon three liquid material in dryer needs to be discharged during regeneration, causing waste of mixed carbon three liquid material in dryer, and needing to stop processing, delaying working hours, while air remaining in dryer can be oxidized with components in mixed carbon three liquid material, so that liquid material deteriorates, and a kind of crude propylene drying separation device is disclosed in patent CN219462976U, first screen, molecular sieve, second screen are sequentially arranged from bottom to top in drying device, and crude propylene raw material is dried by the way of entering from bottom to top, but water content and drying effect are not introduced, and the judgment of drying device running effect and disposal process after penetration are not mentioned.

[0003] A kind of selective hydrogenation method of carbon three fraction is disclosed in patent CN105732284B, wherein propyne propadiene content in carbon three fraction is about 1-3% (mol), liquid material enters adiabatic hydrogenation reactor equipped with Pd-Cu catalyst, and under certain conditions, propyne propadiene can be removed, and the yield of target product propylene can be more obviously increased, but water in carbon three fraction is not treated, and directly enters reactor for hydrogenation treatment. SUMMARY

[0004] To solve the technical problems mentioned in the above background, the present application provides a kind of mixed carbon three's pretreatment device in ethane cracking production, and the technical scheme is as follows:

[0005] The first dryer and the second dryer are connected by pipeline a, pipeline b is arranged on the left part of pipeline a, pump a, valve a, valve b and pump b are arranged on pipeline a from top to bottom, pipeline c is connected to pipeline a, pipeline c is connected to pipeline b, valve c and pump c are arranged on pipeline c, liquid level meter a is arranged on the first dryer, pipeline q is arranged on the first dryer, valve k is arranged on pipeline q;

[0006] Pipeline d is connected to pipeline a, pipeline d is connected to pipeline c, valve d and pump d are arranged on pipeline d, liquid level meter b is arranged on the second dryer, pipeline r is arranged on the second dryer, valve l is arranged on pipeline r;

[0007] Pipeline e and pipeline f are connected to the first dryer and the second dryer respectively, an online water content analyzer is connected between pipeline e and pipeline f, pump h and pump g are arranged on pipeline e and pipeline f respectively;

[0008] Pipeline g is connected between pipeline e and pipeline f, pump e, valve e, valve f and pump f are arranged on pipeline g from top to bottom;

[0009] Regeneration device is arranged on pipeline g, light component of light-removing column is arranged in the regeneration device;

[0010] Mixing device is connected between pipeline e and pipeline f, reaction device is connected to the mixing device.

[0011] Preferably, the regeneration device comprises heater a, pipeline h is connected to the upper part of heater a, steam is arranged in pipeline h, valve g is arranged on pipeline h, pipeline i is arranged on the left part of heater a, light component of light-removing column is arranged in pipeline i, pipeline j is connected between heater a and pipeline g.

[0012] Preferably, the mixing device comprises mixer, pipeline k is connected to the left part of mixer, pipeline s is connected to pipeline k, hydrogen is arranged in pipeline s, valve h is arranged on pipeline s, pipeline k is connected to pipeline e and pipeline f, reaction device is connected to the mixer.

[0013] Preferably, the reaction device comprises heater b and reactor, pipeline l is connected to the upper part of heater b, steam is arranged in pipeline l, pipeline m is arranged between heater b and mixer, pipeline n is connected between heater b and reactor.

[0014] Preferably, pipeline o is connected to pipeline m and valve i is arranged on pipeline o, pipeline o is connected to pipeline n, valve j is arranged on pipeline l, temperature controller a and temperature controller b are arranged on pipeline n.

[0015] Preferably, coalescer is connected to pipeline b, pipeline p is connected to the coalescer.

[0016] The present application has the following advantages: through the control cooperation of multiple valves and multiple pipelines, when one of the first and second dryers is saturated, one is closed and the other is opened, the closed one first discharges the mixed carbon three liquid material, and then the light component drying gas of the downstream light component column is introduced into the closed one as a regeneration gas source, while the light component remaining in the closed dryer does not affect the mixed carbon three liquid material entering next time, through the control of the liquid level meter and the valve, the wet steam generated by drying the drying agent in the closed dryer is discharged from the dryer, at the same time, the mixed carbon three liquid material discharged from the closed dryer enters the pipeline b and then enters the opened dryer, and the water removal operation of the mixed carbon three liquid material is performed, the present application ensures the continuous water removal of the mixed carbon three liquid material while drying and regenerating the drying agent in the dryer, and the light component remaining in the dryer while drying the drying agent does not affect the mixed carbon three liquid material entering the dryer next time, and the mixed carbon three liquid material discharged from the regeneration of the drying agent in the dryer is recycled and immediately subjected to water removal operation. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The present application has the following advantages: through the control cooperation of multiple valves and multiple pipelines, when one of the first and second dryers is saturated, one is closed and the other is opened, the closed one first discharges the mixed carbon three liquid material, and then the light component drying gas of the downstream light component column is introduced into the closed one as a regeneration gas source, while the light component remaining in the closed dryer does not affect the mixed carbon three liquid material entering next time, through the control of the liquid level meter and the valve, the wet steam generated by drying the drying agent in the closed dryer is discharged from the dryer, at the same time, the mixed carbon three liquid material discharged from the closed dryer enters the pipeline b and then enters the opened dryer, and the water removal operation of the mixed carbon three liquid material is performed, the present application ensures the continuous water removal of the mixed carbon three liquid material while drying and regenerating the drying agent in the dryer, and the light component remaining in the dryer while drying the drying agent does not affect the mixed carbon three liquid material entering the dryer next time, and the mixed carbon three liquid material discharged from the regeneration of the drying agent in the dryer is recycled and immediately subjected to water removal operation.

[0018] The accompanying drawings are as follows: 1 first dryer, 2 second dryer, 3 pipeline a, 4 pipeline b, 5 pump a, 6 valve a, 7 valve b, 8 pump b, 9 pipeline c, 10 valve c, 11 pump c, 12 liquid level meter a, 13 pipeline d, 14 valve d, 15 pump d, 16 liquid level meter b, 17 pipeline e, 18 pipeline f, 19 online water content analyzer, 20 pipeline g, 21 pump e, 22 valve e, 23 valve f, 24 pump f, 25 heater a, 26 pipeline h, 27 valve g, 28 pipeline i, 29 pipeline j, 30 mixer, 31 pipeline k, 32 valve h, 33 heater b, 34 reactor, 35 pipeline l, 36 pipeline m, 37 pipeline n, 38 pipeline o, 39 valve i, 40 valve j, 41 temperature controller a, 42 temperature controller b, 43 coalescer, 44 pipeline p, 45 pipeline q, 46 valve k, 47 pipeline r, 48 valve l, 49 pump h, 50 pump g, 51 pipeline s. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0020] EMBODIMENT

[0021] Please refer to Figure 1 :

[0022] The application provides a mixed carbon three pretreatment device for ethane cracking production, which comprises a first dryer 1 and a second dryer 2, dryers are arranged in the centers of the first dryer 1 and the second dryer 2, the first dryer 1 and the second dryer 2 are connected through a pipeline a3, a pipeline b4 is arranged on the left part of the pipeline a3, mixed carbon three liquid material enters the pipeline a3 through the pipeline b4, the mixed carbon three liquid material enters the first dryer 1 and the second dryer 2 through the pipeline a3, a pump a5, a valve a6, a valve b7 and a pump b8 are sequentially arranged on the pipeline a3 from top to bottom, the mixed carbon three liquid material in the pipeline a3 is controlled to enter the first dryer 1 or the second dryer 2 through the pump a5, the valve a6, the valve b7 and the pump b8, the pipeline a3 is connected with a pipeline c9, the pipeline c9 is connected with the pipeline b4, a valve c10 and a pump c11 are arranged on the pipeline c9, when the mixed carbon three liquid material in the first dryer 1 needs to be discharged, the valve c10 is opened, the mixed carbon three liquid material in the first dryer 1 is made to enter the pipeline b4 through the pipeline c9 by the pump c11, a liquid level meter a12 is arranged on the first dryer 1 and is used for measuring the liquid level of the mixed carbon three liquid material in the first dryer 1, a pipeline q45 is arranged on the first dryer 1, a valve k46 is arranged on the pipeline q45, the steam dried by the dryers is discharged through the pipeline q45 when the valve k46 is opened, the pipeline a3 is connected with a pipeline d13, the pipeline d13 is connected with the pipeline c9 and is provided with a valve d14 and a pump d15, the valve d14 is opened, the dryers in the second dryer 2 are discharged through the pipeline d13 by the steam after being dried, a liquid level meter b16 is arranged on the second dryer 2 and is used for measuring the liquid level of the mixed carbon three liquid material in the second dryer 2, a pipeline r47 is arranged on the second dryer 2, a valve l48 is arranged on the pipeline r47, a pipeline e17 and a pipeline f18 are connected with the first dryer 1 and the second dryer 2 respectively, an on-line water content analyzer 19 is connected between the pipeline e17 and the pipeline f18 and is used for measuring the water content of the mixed carbon three liquid material in the pipeline e17 and the pipeline f18 respectively, a pump h49 and a pump g50 are arranged on the pipeline e17 and the pipeline f18 respectively, the mixed carbon three liquid material in the e17 and the f18 can be respectively pumped out through the pump h49 and the pump g50, a pipeline g20 is connected between the pipeline e17 and the pipeline f18, a pump e21, a valve e22, a valve f23 and a pump f24 are sequentially arranged on the pipeline g20 from top to bottom, a regenerating device is arranged on the pipeline g20, light component removal towers are arranged in the regenerating device, the light component removal towers in the regenerating device enter the pipeline g20, the light component removal towers are downstream light component removal tower products and are dry material gas, the components of the light component removal towers do not affect the mixed carbon three, a mixing device is connected between the pipeline e17 and the pipeline f18, the water in the mixed carbon three liquid material is absorbed through the dryers in the first dryer 1 or the second dryer 2, then the mixed carbon three liquid material enters the mixing device and is mixed with hydrogen, the hydrogen reacts with propyne and propadiene in the mixed carbon three liquid material, so that the propyne and the propadiene in the mixed carbon three liquid material are removed,The mixing device is connected with a reaction device, and the water, propyne and propadiene in the mixing device are removed and enter the reaction device to react.

[0023] The regeneration device comprises a heater a25, a pipeline h26 is connected to the upper portion of the heater a25, steam is arranged in the pipeline h26, a valve g27 is arranged on the pipeline h26, when the valve g27 is opened, the steam enters the heater a25 through the pipeline h26, a pipeline i28 is arranged on the left portion of the heater a25, light components of a light removal tower are arranged in the pipeline i28, and a pipeline j29 is connected between the heater a25 and the pipeline g20, the light components of the light removal tower in the pipeline i28 are heated in the heater a25 and then enter the pipeline g20.

[0024] The mixing device comprises a mixer 30, a pipeline k31 is connected to the left portion of the mixer 30, a pipeline s51 is connected to the pipeline k31, hydrogen is arranged in the pipeline s51, a valve h32 is arranged on the pipeline s51, when the valve h32 is opened, the hydrogen enters the pipeline k31 through the pipeline s51 and then enters the mixer 30 together with the mixed carbon three liquid material from which water is removed to mix and react, the pipeline k31 is connected with the pipeline e17 and the pipeline f18, the mixed carbon three liquid material in the pipeline e17 or the pipeline f18 enters the pipeline k31, and a reaction device is connected to the mixer 30.

[0025] The reaction device comprises a heater b33 and a reactor 34, a pipeline l35 is connected to the upper portion of the heater b33, steam is arranged in the pipeline l35, the steam enters the heater b33 through the pipeline l35 to heat the heater b33, a pipeline m36 is arranged between the heater b33 and the mixer 30, a pipeline n37 is connected between the heater b33 and the reactor 34, the mixed carbon three liquid material from which water, propyne and propadiene are removed is heated in the heater b33, enters the reactor 34 through the pipeline n37 under certain reaction conditions, a pipeline o38 is connected to the pipeline m36 and a valve i39 is arranged on the pipeline o38, the pipeline o38 is connected with the pipeline n37, a valve j40 is arranged on the pipeline l35, a temperature controller a41 and a temperature controller b42 are arranged on the pipeline n37, when the temperature controller b42 detects that the temperature of the mixed carbon three liquid material in the pipeline n37 is lower than the set reaction temperature, the temperature controller b42 controls the valve i39 to be closed, and the temperature controller a41 controls the valve j40 to be opened, so that the steam enters the heater b33 to heat the heater b33.

[0026] A coalescer 43 is connected to the pipeline b4, a pipeline p44 is connected to the coalescer 43, the mixed carbon three liquid material enters the coalescer 43 through the pipeline p44, and a part of water in the mixed carbon three liquid material can be removed, so that the water removal in the dryer 1 or the dryer 2 is reduced.

[0027] The working principle of the application is as follows:

[0028] The mixed C3 liquid enters line p44 into coalescer 43, through which a portion of the water in the mixed C3 liquid is removed, and then enters line b4, valve a6 and pump a5 are opened, valve b7 and pump b8 are closed, the mixed C3 liquid enters line a3 into first dryer 1, through the drying agent in first dryer 1, the water in the mixed C3 liquid is absorbed by the drying agent, the water in the mixed C3 liquid is removed first, and then is sent into line k31 through pump h49, valve h32 is opened, hydrogen enters line k31 through line s51 to enter mixer 30 together with the mixed C3 liquid, the hydrogen reacts with propyne and propadiene in the mixed C3 liquid, the propyne and propadiene in the mixed C3 liquid are removed, and then the mixed C3 liquid is heated in heater b36 through line m36, and then enters reactor 34 through line n37 to react.

[0029] When the drying agent in first dryer 1 is saturated with water, and the water content in the mixed C3 liquid is detected by on-line water content analyzer 19 to be over the standard, valve a6 and pump a5 are closed, valve b7 and pump b8 are opened, the mixed C3 liquid no longer enters first dryer 1, pump h49 is also closed, valve c10 and pump c11 are opened, the mixed C3 liquid in first dryer 1 is discharged into line b4 through line c9, and then enters second dryer 2 through line a3, when the liquid level of the mixed C3 liquid in first dryer 1 is detected by liquid level gauge a12 to be lower than line q45, valve c10 and pump c11 are closed, valve k46 is opened, at this time the light components of the light-removing tower enter heater a25 through line i28 to be heated, and then enter line g20 through line j29, and then enter line e17 until entering first dryer 1, from top to bottom through the saturated drying agent, the drying agent is dried, the dried light components of the light-removing tower steam are discharged through line q45, at the same time, the mixed C3 liquid discharged from first dryer 1 enters second dryer 2, pump g50 is opened, and enters line k31.

[0030] When the drying agent in second dryer 2 is saturated, pump h49, pump a5 and valve a6 are opened, valve b7, pump b8 and pump g50 are closed, valve d14 and pump d15 are opened, the mixed C3 liquid in second dryer 2 enters line d13, and then enters line c9, line b4 and line a3 until entering first dryer 1, when the liquid level of the mixed C3 liquid in second dryer 2 is detected by liquid level gauge b to be lower than line r47, valve d14 and pump d15 are closed, the light components of the light-removing tower enter second dryer 2 through line f18, from top to bottom through the drying agent in second dryer 2, the drying agent is dried, valve l48 is opened, the dried light components of the light-removing tower steam are discharged through line r47.

[0031] The application is simple in operation, convenient to use, and suitable for comprehensive promotion and application. Although the embodiments of the application have been shown and described, it is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A pretreatment device for mixed C3s produced in the ethane cracking, characterized by, The utility model relates to a drying system, including first dryer (1) and second dryer (2), first dryer (1) and second dryer (2) are connected through pipeline a (3) between and pipeline a (3) left part is provided with pipeline b (4), pipeline a (3) is provided with pump a (5) from top to bottom successively on, valve a (6), valve b (7) and pump b (8), pipeline a (3) is connected with pipeline c (9), pipeline c (9) is connected with pipeline b (4), and pipeline c (9) is provided with valve c (10) and pump c (11) on, first dryer (1) is provided with liquid level meter a (12), and first dryer (1) is provided with pipeline q (45), and pipeline q (45) is provided with valve k (46) on, Pipeline a (3) is connected with pipeline d (13), and pipeline d (13) is connected with pipeline c (9) and is provided with valve d (14) and pump d (15) on pipeline d (13), and second dryer (2) is provided with liquid level meter b (16), and second dryer (2) is provided with pipeline r (47), and pipeline r (47) is provided with valve l (48) on, First dryer (1) and second dryer (2) are connected with pipeline e (17) and pipeline f (18) respectively, and online water content analyzer (19) is connected between pipeline e (17) and pipeline f (18), and pump h (49) and pump g (50) are provided on pipeline e (17) and pipeline f (18) respectively, Pipeline e (17) and pipeline f (18) are connected with pipeline g (20), and pump e (21), valve e (22), valve f (23) and pump f (24) are provided from top to bottom successively on pipeline g (20), Pipeline g (20) is provided with regenerative device, and the regenerative device is provided with light component of light-removing column in, Pipeline e (17) and pipeline f (18) are connected with mixing device, and the mixing device is connected with reaction device, The regenerative device includes heater a (25), pipeline h (26) is connected to the upper portion of heater a (25), steam is arranged in pipeline h (26), valve g (27) is arranged on pipeline h (26), pipeline i (28) is arranged on the left portion of heater a (25), light component of light-removing column is arranged in pipeline i (28), pipeline j (29) is connected between heater a (25) and pipeline g (20).

2. The pretreatment device for mixed C3 produced by ethane cracking according to claim 1, characterized in that, The mixing device includes mixer (30), pipeline k (31) is connected to the left portion of mixer (30), pipeline s (51) is connected to pipeline k (31), hydrogen is arranged in pipeline s (51), valve h (32) is arranged on pipeline s (51), pipeline k (31) is connected with pipeline e (17) and pipeline f (18), and the mixer (30) is connected with reaction device.

3. The pretreatment device for mixed C3 produced by ethane cracking according to claim 1, characterized in that, The reaction device includes heater b (33) and reactor (34), pipeline l (35) is connected to the upper portion of heater b (33), steam is arranged in pipeline l (35), pipeline m (36) is arranged between heater b (33) and mixer (30), and pipeline n (37) is connected between heater b (33) and reactor (34).

4. The pretreatment device for mixed C3 produced in the ethane cracking according to claim 3, characterized in that, A line m (36) is connected to a line o (38) having a valve i (39) disposed thereon, the line o (38) is connected to a line n (37), the line l (35) has a valve j (40) disposed thereon, and the line n (37) has a temperature controller a (41) and a temperature controller b (42) disposed thereon.

5. The pretreatment device for mixed C3 produced in the ethane cracking according to claim 1, characterized in that, The line b (4) is connected to a coalescer (43), and the coalescer (43) is connected to a line p (44).

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