Acid-hydrocarbon separation device

Abstract

The utility model relates to an acid-hydrocarbon separation device which comprises a horizontal cylinder and a vertical cylinder which are communicated with each other, and fine coalescence elements are respectively arranged in the horizontal cylinder and the vertical cylinder; liquid phase hydrocarbon obtained after acid hydrocarbon flowing out of alkylation reaction is separated can be subjected to fine separation treatment, trace acid and acid ester in the liquid phase hydrocarbon can be efficiently removed, and the device is compact in structure, low in equipment investment, small in occupied area and large in treatment capacity of single equipment.

Description

Technical Field

[0001] The present disclosure relates to the technical field of acid hydrocarbon separation, and in particular, to an acid hydrocarbon separation device. Background Art

[0002] In the process of petroleum refining, the alkylation reaction between isobutane and butene (or a mixture of propylene, butene and pentene) to produce alkylate is an important process in refinery gas processing. Alkylate is a mixture of C8 branched alkanes, which is free of olefins and aromatics, and is almost free of sulfur and nitrogen, with low sensitivity and vapor pressure. It is a clean and ideal high-octane gasoline blending component.

[0003] At present, the mainstream alkylation units in the industry at home and abroad still use sulfuric acid alkylation process and hydrofluoric acid alkylation process. Some domestic alkylation units use ionic liquid process, which is also a kind of liquid acid. Since the safety of sulfuric acid alkylation technology is better than that of hydrofluoric acid, most of the newly built alkylation units in the past 20 years use sulfuric acid process, which has become the mainstream alkylation technology selected by today's oil refining enterprises.

[0004] In the liquid acid alkylation process, the reaction effluent is a mixture of liquid acid and hydrocarbons. Depending on the process, the liquid acid content is between 40-60% by volume. After the reaction effluent undergoes preliminary acid-hydrocarbon separation, the separated acid phase and most of the hydrocarbon phase are returned to the reactor to continue the reaction, while the liquid hydrocarbon product still contains trace amounts of acid and acid esters, which need to be sent to the downstream refining system for further deacidification treatment.

[0005] After the acid-hydrocarbon separation of the effluent from the traditional stirred tank sulfuric acid alkylation reaction, the trace acid and acid esters carried in the liquid hydrocarbon product need to be removed through acid washing, alkali washing and water washing processes. This not only has a complicated process, consumes alkali liquid, has a large amount of wastewater discharge, and has high labor intensity. Utility Model Content

[0006] The purpose of the present disclosure is to provide an acid hydrocarbon separation device, which can further finely separate and treat the liquid hydrocarbon product obtained after separating the acid hydrocarbon flowing out of the sulfuric acid or ionic liquid alkylation reaction, and efficiently remove trace acids and acid esters therein.

[0007] In order to achieve the above-mentioned object, the present disclosure provides an acid hydrocarbon separation device, which comprises a horizontal cylinder and a vertical cylinder which are connected and arranged;

[0008] The vertical cylinder is arranged above the horizontal cylinder;

[0009] The first end cover of the horizontal cylinder is provided with a liquid-phase acid hydrocarbon inlet;

[0010] In the horizontal cylinder, a flow stabilizing plate and a first fine coalescing element are arranged between the liquid-phase acid hydrocarbon inlet and the vertical cylinder;

[0011] The first fine coalescing element is arranged perpendicular to the axial direction of the horizontal cylinder;

[0012] The flow stabilizing plate and the first fine coalescing element are arranged perpendicular to the axial direction of the horizontal cylinder;

[0013] A second fine coalescing element is disposed in the vertical cylinder;

[0014] The second fine coalescing element is arranged perpendicular to the axial direction of the vertical cylinder.

[0015] Optionally, the flow area of ​​the vertical cylinder is 35%-95% of the flow area of ​​the horizontal cylinder.

[0016] Optionally, a distance L2 between the vertical cylinder and the top of the first head in the axial direction of the horizontal cylinder is 60%-90% of the total length of the horizontal cylinder.

[0017] Optionally, a hydrocarbon outlet is provided on the third end cover of the vertical cylinder; the hydrocarbon outlet is provided above the second fine coalescing element;

[0018] The distance between the second fine coalescing element and the top of the third head in the axial direction of the vertical cylinder is 200-3000 mm.

[0019] Optionally, a liquid bag is provided at the bottom of the horizontal cylinder.

[0020] Optionally, a distance L1 between the liquid bag and the top of the first head in the axial direction of the horizontal cylinder is 70%-90% of the total length of the horizontal cylinder.

[0021] Optionally, the edge of the flow stabilizing plate is sealed and connected to the inner wall of the horizontal cylinder;

[0022] The flow stabilizing plate comprises a sieve plate or a shutter plate, and the opening rate of the flow stabilizing plate is 30%-65%.

[0023] Optionally, the distance between the flow stabilizing plate and the top of the first head in the axial direction of the horizontal cylinder is 200-2000 mm;

[0024] The distance between the flow stabilizer plate and the first fine coalescing element in the axial direction of the horizontal cylinder is 200-2000 mm.

[0025] Optionally, the first fine coalescing element and the second fine coalescing element are respectively wire mesh fillers;

[0026] The mesh density of the mesh packing is 20-100 kg / m 3 ;

[0027] The lengths of the first fine coalescing element and the second fine coalescing element along their respective axial directions are 200-1500 mm respectively.

[0028] Optionally, an inspection port is provided on a second end cover of the horizontal cylinder away from the liquid-phase acid hydrocarbon inlet.

[0029] Through the above technical scheme, the present invention provides a horizontal cylinder and a vertical cylinder that are interconnected, and provides a fine agglomeration element therein, so as to perform fine separation treatment on the liquid hydrocarbon product obtained after separation of the acid hydrocarbon flowing out of the sulfuric acid or ionic liquid alkylation reaction, and efficiently remove the trace acid and acid ester therein. The device disclosed in the present invention has a compact structure, low equipment investment, small floor space, and a large processing capacity of a single device, and the liquid hydrocarbon product obtained after fine separation no longer needs to be subjected to alkali washing, water washing, and other processes before entering the subsequent product fractionation system, so that the subsequent effluent is in a dry state, reducing the discharge of saline wastewater and the corrosion to the device, and improving safety.

[0030] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0032] Figure 1 It is a schematic structural diagram of an acid hydrocarbon separation device according to an embodiment of the present disclosure.

[0033] Description of Reference Numerals

[0034] 1: horizontal cylinder; 2: vertical cylinder; 3: liquid acid hydrocarbon inlet; 4: inspection port; 5: flow stabilizing plate; 6: first fine coalescing element; 7: second fine coalescing element; 8: liquid bag; 9: hydrocarbon outlet. DETAILED DESCRIPTION

[0035] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0036] In the description of the present invention, it should be understood that terms such as "front", "rear", "left", "right", "up", "down", "top" and "bottom" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. They do not indicate that the device or component must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0037] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] The present disclosure provides an acid hydrocarbon separation device, which comprises a horizontal cylinder 1 and a vertical cylinder 2 which are connected and arranged;

[0039] The vertical cylinder 2 is arranged above the horizontal cylinder 1;

[0040] The first end cover of the horizontal cylinder 1 is provided with a liquid acid hydrocarbon inlet 3;

[0041] In the horizontal cylinder 1, a flow stabilizing plate 5 and a first fine coalescing element 6 are arranged between the liquid-phase acid hydrocarbon inlet 3 and the vertical cylinder 2;

[0042] The first fine coalescing element 6 is arranged perpendicular to the axial direction of the horizontal cylinder 1;

[0043] The flow stabilizer plate 5 is arranged perpendicular to the axial direction of the horizontal cylinder 1;

[0044] A second fine agglomeration element 7 is disposed in the vertical cylinder 2;

[0045] The second fine coalescing element 7 is disposed perpendicular to the axial direction of the vertical cylinder 2 .

[0046] The acid hydrocarbon separation device disclosed in the present invention integrates a horizontal cylinder and a vertical cylinder respectively provided with fine coalescing elements into the same device, and a flow stabilizing plate is arranged upstream of the fine coalescing element in the horizontal cylinder, the flow stabilizing plate makes the flow of liquid hydrocarbons entering the device uniform and stable, and pre-separates the large particle acid droplets entrained therein; the obtained logistics pass through the fine coalescing elements in the horizontal cylinder and the vertical cylinder respectively, and the irregular microchannel separation units formed by the fine coalescing elements due to the acid-affinity and acid-hating characteristics thereof are utilized to make the small droplets of acid and acid esters mixed in the liquid hydrocarbon product collide and adhere, the droplet diameter is doubled, and the formed large droplets are precipitated and discharged, so as to efficiently remove the acid and acid esters in the liquid hydrocarbon product obtained after the acid hydrocarbons flowing out of the alkylation reaction are separated, and the separated liquid hydrocarbons can enter the subsequent product separation system without the need for alkali washing and water washing processes, thereby simplifying the process and the device, and reducing the discharge of wastewater and the consumption of alkali solution.

[0047] According to one embodiment of the present disclosure, the flow area of ​​the vertical cylinder 2 is 35%-95% of the flow area of ​​the horizontal cylinder 1; the fluid flow rate is controlled by limiting the ratio of the flow areas of the vertical cylinder and the horizontal cylinder, thereby reducing equipment investment while ensuring the separation effect; wherein, the "flow area" refers to the cross-sectional area of ​​the cylinder.

[0048] According to one embodiment of the present disclosure, a hydrocarbon outlet 9 is provided on the third head of the vertical cylinder 2, which is used to discharge the separated liquid hydrocarbons to a subsequent fractionation processing unit; the hydrocarbon outlet 9 is provided above the second fine agglomeration element 7; preferably, the axial distance between the second fine agglomeration element 7 and the top of the third head of the vertical cylinder 2 is 200-3000mm; limiting the distance between the second fine agglomeration element and the top of the third head can ensure the acid hydrocarbon separation effect while reducing equipment investment.

[0049] According to one embodiment of the present disclosure, the axial distance L2 between the vertical cylinder 2 and the top of the first head in the horizontal cylinder 1 is 60%-90% of the total length of the horizontal cylinder 1; the above-mentioned arrangement can ensure the acid-hydrocarbon separation effect while reducing equipment investment.

[0050] According to one embodiment of the present disclosure, a liquid bag 8 is provided at the bottom of the horizontal cylinder 1 for collecting acids and acid esters that are deposited downward due to gravity.

[0051] According to an embodiment of the present disclosure, the axial distance L1 between the liquid bag 8 and the top of the first head in the horizontal cylinder 1 is 70%-90% of the total length of the horizontal cylinder 1; the above arrangement can be more conducive to collecting the separated acid phase.

[0052] In order to further improve the stabilization effect and separation efficiency, and stabilize the flow rate of the liquid phase flow to prevent it from directly colliding with the first fine aggregation element at a higher speed and causing damage to the element, according to an embodiment of the present disclosure, the edge of the flow stabilizer 5 is sealed and connected to the inner wall of the horizontal cylinder 1; the flow stabilizer 5 includes a sieve plate or a louver plate, and the opening rate of the flow stabilizer 5 is 30%-65%.

[0053] According to an embodiment of the present disclosure, the distance between the flow stabilizing plate 5 and the top of the first head in the axial direction of the horizontal cylinder 1 is 200-2000 mm; the above arrangement can reduce equipment investment while ensuring fluid stability.

[0054] According to an embodiment of the present disclosure, the axial distance between the flow stabilizer 5 and the first fine agglomeration element 6 in the horizontal cylinder 1 is 200-2000 mm; the setting of the above distance can ensure the acid-hydrocarbon separation effect while reducing equipment investment.

[0055] According to one embodiment of the present disclosure, the first fine coalescing element 6 and the second fine coalescing element 7 are respectively wire mesh fillers; the wire mesh density of the wire mesh fillers is 20-100 kg / m 3 , wherein the wire mesh density refers to the mass of the wire mesh per unit volume. Using a wire mesh filler having the above-mentioned wire mesh density as a fine agglomeration element can improve the deacidification efficiency without hindering the flow of the liquid phase logistics.

[0056] According to one embodiment of the present disclosure, the wire mesh filler can be formed by mixing non-metallic wires and metal wires, the non-metallic wires include one or more of glass fiber wires, polypropylene wires, polyvinylidene fluoride (PVDC) fiber wires and polytetrafluoroethylene (PTFE) fiber wires; the metal wires include one or more of 304 stainless steel, 316L stainless steel, 904L stainless steel and Alloy 20 nickel-based alloy; the present disclosure uses a wire mesh filler made of the above materials as a fine agglomeration unit, and can utilize its acid-phobic and acid-philic properties to form an irregular microchannel separation unit, so that small droplets of acids and acid esters mixed in the liquid hydrocarbon product collide and adhere, the droplet diameter doubles, and the large droplets are precipitated, thereby achieving the separation and removal of acids and acid esters.

[0057] According to an embodiment of the present disclosure, the lengths of the first fine agglomerating element 6 and the second fine agglomerating element 7 along their respective axial directions are 200-1500 mm respectively; the above arrangement can ensure the acid-hydrocarbon separation effect while reducing equipment investment.

[0058] According to an embodiment of the present disclosure, an inspection port 4 is provided on the cover of the horizontal cylinder 1 on the other side away from the liquid-phase acid hydrocarbon inlet 3 for inspecting the device.

[0059] In the present disclosure, various structures may be connected by welding.

[0060] According to a specific embodiment of the present disclosure, Figure 1 The device shown for acid hydrocarbon separation includes:

[0061] The liquid hydrocarbon (containing alkylation products, acid and acid ester, and the total content of acid and acid ester is 100-3000ug / g) obtained by acid hydrocarbon separation of the alkylation reaction effluent is introduced into the horizontal cylinder 1 through the liquid acid hydrocarbon inlet 3, and sequentially passes through the flow stabilizer 5 and the first fine coalescing element 6 arranged perpendicular to the axial direction of the horizontal cylinder 1. The distance between the flow stabilizer 5 and the top of the first end cap in the axial direction of the horizontal cylinder 1 is 200-2000mm; the distance between the flow stabilizer 5 and the first fine coalescing element 6 in the axial direction of the horizontal cylinder 1 is 200-2000mm. 0mm, the large-particle acid droplets in the liquid hydrocarbon are pre-separated by the flow stabilizing plate 5, and the small-particle acid droplets in the obtained logistics collide and adhere in the first fine coalescing element 6, and the droplet diameter is doubled to achieve a first-level fine separation. The obtained logistics enters the vertical cylinder 2 arranged on the top of the horizontal cylinder 1, and passes through the second fine coalescing element 7 arranged perpendicular to the axial direction of the vertical cylinder 2 to achieve a second-level fine separation. The distance between the second fine coalescing element 7 and the top of the third head arranged on the vertical cylinder 2 in the axial direction of the vertical cylinder 2 is 200-3000mm. The lengths of the first fine coalescing element 6 and the second fine coalescing element 7 along their respective axial directions are 200-1500mm respectively; the first fine coalescing element 6 and the second fine coalescing element 7 are respectively wire mesh fillers formed by mixing non-metallic wires and metal wires, and the wire mesh densities are 20-100kg / m 3 The distance L2 between the vertical cylinder 2 and the top of the first end cap in the axial direction of the horizontal cylinder 1 is 60%-90% of the total length of the horizontal cylinder 1, and the flow area of ​​the vertical cylinder 2 is 35%-95% of the flow area of ​​the horizontal cylinder 1; the content of acids and acid esters in the obtained hydrocarbon substances reaches below 50ug / g, and is drawn out from the hydrocarbon outlet 9 set on the third end cap at the top of the vertical cylinder 2, and the distance between the second fine agglomeration element 7 and the top of the third end cap in the axial direction of the vertical cylinder 2 is 200-3000mm, and it directly enters the subsequent fractionation unit without water washing and alkali washing. The acids and acid esters are deposited downward due to gravity and flow into the liquid bag 8 set at the bottom of the horizontal cylinder 1, and the distance L1 between the liquid bag 8 and the top of the first end cap in the axial direction of the horizontal cylinder 1 is 70%-90% of the total length of the horizontal cylinder 1.

[0062] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0063] 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 disclosure will not further describe various possible combinations.

[0064] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An acid hydrocarbon separation device, characterized in that: The acid-hydrocarbon separation device comprises a horizontal cylinder (1) and a vertical cylinder (2) which are connected to each other; The vertical cylinder (2) is arranged above the horizontal cylinder (1); The first end cover of the horizontal cylinder (1) is provided with a liquid-phase acid hydrocarbon inlet (3); In the horizontal cylinder (1), a flow stabilizing plate (5) and a first fine coalescing element (6) are arranged between the liquid-phase acid hydrocarbon inlet (3) and the vertical cylinder (2); The flow stabilizing plate (5) and the first fine coalescing element (6) are arranged perpendicular to the axial direction of the horizontal cylinder (1); A second fine agglomerating element (7) is arranged in the vertical cylinder (2); The second fine coalescing element (7) is arranged perpendicular to the axial direction of the vertical cylinder (2).

2. The acid hydrocarbon separation device according to claim 1, characterized in that: The flow area of ​​the vertical cylinder (2) is 35%-95% of the flow area of ​​the horizontal cylinder (1).

3. The acid hydrocarbon separation device according to claim 1, characterized in that: The distance L2 between the vertical cylinder (2) and the top of the first head in the axial direction of the horizontal cylinder (1) is 60%-90% of the total length of the horizontal cylinder (1).

4. The acid hydrocarbon separation device according to claim 1, characterized in that: A hydrocarbon outlet (9) is provided on the third end cap of the vertical cylinder (2); the hydrocarbon outlet (9) is provided above the second fine coalescing element (7); The distance between the second fine coalescing element (7) and the top of the third head in the axial direction of the vertical cylinder (2) is 200-3000 mm.

5. The acid hydrocarbon separation device according to claim 1, characterized in that: A liquid bag (8) is arranged at the bottom of the horizontal cylinder (1).

6. The acid hydrocarbon separation device according to claim 5, characterized in that: The distance L1 between the liquid bag (8) and the top of the first head in the axial direction of the horizontal cylinder (1) is 70%-90% of the total length of the horizontal cylinder (1).

7. The acid hydrocarbon separation device according to claim 1, characterized in that: The edge of the flow stabilizing plate (5) is sealedly connected to the inner wall of the horizontal cylinder (1); The flow stabilizing plate (5) comprises a sieve plate or a shutter plate, and the opening rate of the flow stabilizing plate (5) is 30%-65%.

8. The acid hydrocarbon separation device according to claim 1, characterized in that: The distance between the flow stabilizing plate (5) and the top of the first end cover in the axial direction of the horizontal cylinder (1) is 200-2000 mm; The distance between the flow stabilizing plate (5) and the first fine coalescing element (6) in the axial direction of the horizontal cylinder (1) is 200-2000 mm.

9. The acid hydrocarbon separation device according to claim 1, characterized in that: The first fine coalescing element (6) and the second fine coalescing element (7) are respectively wire mesh fillers; The mesh density of the mesh packing is 20-100 kg / m 3 ; The lengths of the first fine coalescing element (6) and the second fine coalescing element (7) along their respective axial directions are 200-1500 mm respectively.

10. The acid hydrocarbon separation device according to claim 1, characterized in that: An inspection port (4) is provided on the second end cover of the horizontal cylinder (1) away from the liquid-phase acid hydrocarbon inlet (3).

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