One-stage nitration liquid separator

Abstract

The present invention relates to the field of nitrification liquid separation, and specifically discloses a one-stage nitrification liquid separator, which solves the technical problem that two separation devices need to be used in the current nitrification liquid separation process, resulting in a large footprint and high energy consumption. The separator includes: a reactor, including a feed inlet, an upper discharge port and a lower discharge port, a partition extending in the horizontal direction is provided in the reactor, one end of the partition is fixedly connected to the inner wall of the reactor, and the other end is arranged at intervals on the inner wall of the reactor to separate the reactor into two interconnected first and second accommodating chambers; a temperature control component is arranged in the first accommodating chamber; a separation component is arranged in the second accommodating chamber; and a heat preservation component is arranged at the bottom of the reactor; wherein the feed inlet is connected to the first accommodating chamber, and the upper discharge port and the lower discharge port are connected to the second accommodating chamber. One separation tower can play the functions of two separators, which greatly reduces the footprint of the equipment and effectively reduces energy consumption.

Description

Technical Field

[0001] The invention relates to the technical field of nitrification liquid separation, in particular to a one-stage nitrification liquid separator. Background Art

[0002] During the nitration of benzene, the resulting nitration liquid is a complex mixture containing the target product nitrobenzene, incompletely reacted raw material benzene, acidic catalyst and its by-products. In order to ensure that these mixtures can meet the strict standards of subsequent processing or application, they must be precisely separated. However, a single separation operation usually cannot achieve the required purity and recovery efficiency, so a multi-stage separation strategy is often required in practical applications.

[0003] The existing conventional vertical or horizontal gravity separators have the problem of occupying a large area, and the effect of one separation is often unsatisfactory, and it is difficult to ensure the separation quality. In order to achieve a higher separation standard, the current practice is to perform two separations, which means that two sets of separators are required. This arrangement not only increases the number of equipment and occupies more space, but also increases energy consumption due to the addition of a pumping system, which runs counter to the concept of energy saving and consumption reduction, and fails to maximize production benefits. Summary of the invention

[0004] The purpose of the present invention is to provide a one-stage nitration liquid separator to solve the technical problem that two separation devices are needed in the current nitration liquid separation process, resulting in large floor space and high energy consumption.

[0005] The present invention provides a one-stage nitration liquid separator, comprising: a reactor, comprising a feed inlet, an upper discharge port and a lower discharge port, wherein a partition extending in a horizontal direction is arranged in the reactor, one end of the partition is fixedly connected to the inner wall of the reactor, and the other end is arranged at intervals on the inner wall of the reactor to separate the reactor into two interconnected first accommodating chambers and second accommodating chambers; a temperature regulating component is arranged in the first accommodating chamber; a separation component is arranged in the second accommodating chamber; and a heat preservation component is arranged at the bottom of the reactor; wherein the feed inlet is connected to the first accommodating chamber, and the upper discharge port and the lower discharge port are connected to the second accommodating chamber.

[0006] According to one embodiment of the present invention, a first connecting pipe is provided at the bottom of the reactor, the first connecting pipe is connected to a second connecting pipe through a pump, and the outlet of the second connecting pipe is provided at the top of the reactor.

[0007] According to one embodiment of the present invention, the first connecting pipe includes a first connecting section communicating with the first accommodating cavity and a second connecting section communicating with the second accommodating cavity.

[0008] According to one embodiment of the present invention, valves are provided on the first connecting section and the second connecting section.

[0009] According to one embodiment of the present invention, it further comprises a baffle, which is arranged obliquely and has a bottom arranged at the liquid inlet end of the separation component.

[0010] According to one embodiment of the present invention, the baffle and the liquid outlet end of the second connecting pipe are arranged at an angle.

[0011] According to one embodiment of the present invention, the temperature adjustment component is a cooling coil, and cooling water flows through the cooling coil.

[0012] According to one embodiment of the present invention, the separation assembly is an inclined plate separator.

[0013] According to one embodiment of the present invention, the upper discharge port is connected to a receiving groove, the receiving groove opens upward and is connected to the second receiving cavity.

[0014] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0015] The present invention aims at the problems existing in traditional vertical or horizontal gravity separators, such as large floor space, poor initial separation effect, and the need for two separations to ensure separation quality, which results in the need to use two sets of separation devices to meet the separation standards, which not only increases the number of equipment and floor space, but also increases the frequency of use of the pump, thereby increasing energy consumption, failing to achieve the goal of energy saving and consumption reduction, and failing to maximize the defects of production efficiency. By making full use of the different physical and chemical properties of each component in the mixture, especially the density difference and the incompatibility principle, the mononitrobenzene is efficiently separated from the sulfuric acid and nitric acid components; in the present invention, the material first enters the first containing chamber, at this stage, the temperature regulating component adjusts the temperature of the material, and the material is initially separated due to the gravity when falling. Next, the material flows into the second containing chamber through the connected first containing chamber, where the inclined plate separator further processes the material to complete the second more refined separation. Finally, the separated sulfuric acid, nitric acid components and a section of nitrification liquid are discharged from the upper discharge port and the lower discharge port respectively. In addition, a first connecting pipe is provided at the bottom of the reactor, the first connecting pipe is connected to a second connecting pipe through a pump, and the second connecting pipe is provided at the top of the reactor to extract the material from the bottom of the reactor and return it to the reactor from the top, further increasing the gravity of the material and further promoting the separation of the material under the action of gravity. The present invention significantly reduces the number of required devices, reduces energy consumption, and realizes a continuous and stable separation process. One separation tower can play the role of two separators, greatly reducing the equipment footprint while effectively reducing energy consumption, achieving the purpose of energy saving and consumption reduction, thereby improving production efficiency and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a front view of a one-stage nitrification liquid separator provided in Example 1 of the present invention.

[0018] Figure 2 This is a top view of a one-stage nitrification liquid separator provided in Example 1 of the present invention.

[0019] Figure 3 A side view of the internal structure of a one-stage nitrification liquid separator provided in Example 1 of the present invention.

[0020] Figure 4 for Figure 1 Middle AA section view.

[0021] Figure 5 A side view of the internal structure of a one-stage nitration liquid separator provided in Example 2 of the present invention.

[0022] Reference numerals:

[0023] 100, reactor; 110, feed port; 120, upper discharge port; 130, lower discharge port; 140, partition;

[0024] 200, cooling coil;

[0025] 300, inclined plate separator;

[0026] 410, first connecting pipe; 420, second connecting pipe; 430, pump;

[0027] 500, baffle;

[0028] 600, exhaust port;

[0029] 700, manhole;

[0030] 800, thermometer port;

[0031] 900. Insulation coil. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Example 1

[0034] Example 1

[0035] Embodiment 1 of the present invention provides a one-stage nitration liquid separator for separating mononitrobenzene from sulfuric acid and nitric acid components by utilizing the separation principle of density difference and incompatibility according to the differences in physical and chemical properties of the components in the mixture.

[0036] See also Figures 1 to 3 The first-stage nitration liquid separator provided by the embodiment of the present invention comprises: a reactor 100, comprising a feed port 110, an upper discharge port 120 and a lower discharge port 130, wherein the reactor 100 is provided with a partition 140 extending in a horizontal direction, wherein one end of the partition 140 is fixedly connected to the inner wall of the reactor 100, and the other end is arranged at intervals on the inner wall of the reactor 100, so as to separate the reactor 100 into two interconnected first and second accommodating chambers; a temperature regulating component arranged in the first accommodating chamber; a separation component arranged in the second accommodating chamber; and a heat preservation component arranged at the bottom of the reactor 100; wherein the feed port 110 is connected to the first accommodating chamber, the upper discharge port 120 and the lower discharge port 130 are connected to the second accommodating chamber, and the material first enters the first accommodating chamber from the feed port 110, and at this stage, the temperature regulating component regulates the temperature of the material, and the material is initially separated due to the gravity when falling.

[0037] In this embodiment, a first connecting pipe 410 is provided at the bottom of the reactor 100, and the first connecting pipe 410 is connected to the second connecting pipe 420 through a pump 430. The mouth of the second connecting pipe 420 is provided at the top of the reactor 100 to extract the material from the bottom of the reactor 100 and return it to the reactor 100 from the top, further increasing the gravity effect of the material and further promoting the separation of the material under the action of gravity. In the present invention, the second connecting pipe 420 is provided with a valve.

[0038] In this embodiment, the first connecting pipe 410 includes a first connecting section communicating with the first accommodating chamber and a second connecting section communicating with the second accommodating chamber, so as to extract materials at the bottom of the first accommodating chamber and / or the second accommodating chamber for circulation.

[0039] In this embodiment, the heat preservation component includes a heat preservation coil 900 disposed at the bottom of the reaction kettle 100, and heat preservation steam flows inside.

[0040] In this embodiment, valves are provided on the first connecting section and the second connecting section.

[0041] In this embodiment, the temperature control component is a cooling coil 200, and cooling water flows through the cooling coil 200 to achieve temperature control operation.

[0042] In this embodiment, the separation component is an inclined plate separator 300. Since the first accommodating chamber and the second accommodating chamber are connected, the material further enters the inclined plate separator 300. The inclined plate separator 300 further processes the material and completes the second finer separation. A plurality of parallel inclined plates or inclined tubes are installed inside the inclined plate separator 300. The inclined plates are tilted at an angle of 45 to 60 degrees. The inclined plate separator 300 increases the effective sedimentation area per unit volume, thereby improving the separation efficiency. Over time, heavier particles will gradually slide down the inclined plates to the bottom of the container, while lighter materials will continue to flow upward and be discharged through the top. In this way, effective separation of materials with different densities is achieved.

[0043] In this embodiment, the upper discharge port 120 is connected to a receiving tank, the receiving tank opens upward and is connected to the second receiving chamber, and the supernatant partially overflows into the receiving tank and then flows out from the upper discharge port 120 .

[0044] In this embodiment, the reactor 100 is provided with a liquid level meter.

[0045] In this embodiment, the reactor 100 is provided with a manhole 700 .

[0046] In this embodiment, the reaction kettle 100 is provided with an exhaust port 600 .

[0047] In this embodiment, the reaction kettle 100 is provided with a thermometer port 800 .

[0048] The following describes the use of the one-stage nitrification liquid separator of the present invention in detail:

[0049] When in use, the material first enters the first containing chamber. At this stage, the temperature regulating component adjusts the temperature of the material, and the material is initially separated due to the gravity when falling. Next, the material flows into the second containing chamber through the connected first containing chamber, where the inclined plate separator 300 further processes the material to complete the second more refined separation. Finally, the separated sulfuric acid, nitric acid components and a section of nitrification liquid are discharged from the upper discharge port 120 and the lower discharge port 130 respectively. In addition, the bottom of the reactor 100 is provided with a first connecting pipe 410, and the first connecting pipe 410 is connected to the second connecting pipe 420 through a pump 430. The second connecting pipe 420 is provided at the top of the reactor 100 to extract the material from the bottom of the reactor 100, and reflux from the top to the reactor 100 to separate again through the inclined plate separator 300, further promoting the separation of the material under the action of gravity. The present invention significantly reduces the number of required devices, reduces energy consumption, and realizes a continuous and stable separation process.

[0050] Example 2

[0051] Embodiment 2 of the present invention provides a one-stage nitration liquid separator for separating mononitrobenzene from sulfuric acid and nitric acid components by utilizing the separation principle of density difference and incompatibility according to the differences in physical and chemical properties of the components in the mixture.

[0052] See also Figure 1 as well as Figure 2 The one-stage nitration liquid separator provided in the embodiment of the present invention is different from that in the embodiment 1 only in that, in the present embodiment, it also includes a baffle 500, the baffle 500 is tilted, and the bottom is arranged at the liquid inlet end of the separation component, so that the material drawn from the bottom slides up and down on the baffle 500, further increasing the separation effect of the material.

[0053] In this embodiment, the baffle 500 and the liquid outlet end of the second connecting pipe 420 are arranged at an angle.

[0054] The embodiments of the present invention have at least the following advantages:

[0055] The present invention aims at the problems existing in traditional vertical or horizontal gravity separators, such as large floor space, poor initial separation effect, and the need for two separations to ensure separation quality, which results in the need to use two sets of separation devices to meet the separation standards, which not only increases the number of equipment and floor space, but also increases the frequency of use of the pump, thereby increasing energy consumption, failing to achieve the goal of energy saving and consumption reduction, and failing to maximize production efficiency. By making full use of the different physical and chemical properties of each component in the mixture, especially the density difference and the incompatibility principle, nitrobenzene is efficiently separated from sulfuric acid and nitric acid components; in the present invention, the material first enters the first containing chamber, at this stage, the temperature regulating component adjusts the temperature of the material, and the material achieves preliminary separation due to the gravity when falling. Next, the material flows into the second containing chamber through the connected first containing chamber, where the inclined plate separator further processes the material to complete the second more refined separation. Finally, the separated sulfuric acid, nitric acid components and a section of nitrifying liquid are discharged from the upper discharge port and the lower discharge port respectively. In addition, a first connecting pipe is provided at the bottom of the reactor, and the first connecting pipe is connected to the second connecting pipe through a pump. The second connecting pipe is provided at the top of the reactor to extract the material from the bottom of the reactor and return it to the reactor from the top, further increasing the gravity of the material and further promoting the separation of the material under the action of gravity. The present invention significantly reduces the number of required devices, reduces energy consumption, and realizes a continuous and stable separation process. One separation tower can play the role of two separators, greatly reducing the equipment footprint while effectively reducing energy consumption, achieving the purpose of energy saving and consumption reduction, thereby improving production efficiency and economic benefits. The present invention not only optimizes the separation process, but also provides a more compact, efficient and economical option for industrial applications.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A one-stage nitration liquid separator, characterized in that: include: A reactor, comprising a feed inlet, an upper discharge port and a lower discharge port, wherein a partition extending in a horizontal direction is provided in the reactor, one end of the partition is fixedly connected to the inner wall of the reactor, and the other end is spaced apart from the inner wall of the reactor, so as to separate the reactor into two interconnected first accommodating chambers and a second accommodating chamber; A temperature adjustment component is arranged in the first accommodating chamber; A separation component is disposed in the second accommodating cavity; A heat preservation component is arranged at the bottom of the reaction kettle; Wherein, the feed port is connected to the first accommodating chamber, and the upper discharge port and the lower discharge port are connected to the second accommodating chamber.

2. The one-stage nitration liquid separator according to claim 1, characterized in that: A first connecting pipe is provided at the bottom of the reactor. The first connecting pipe is connected to a second connecting pipe through a pump. The outlet of the second connecting pipe is provided at the top of the reactor.

3. The one-stage nitration liquid separator according to claim 2, characterized in that: The first connecting pipe includes a first connecting section communicating with the first accommodating cavity and a second connecting section communicating with the second accommodating cavity.

4. The one-stage nitration liquid separator according to claim 3, characterized in that: Valves are provided on the first connecting section and the second connecting section.

5. The one-stage nitration liquid separator according to any one of claims 1 to 4, characterized in that: It also includes a baffle, which is arranged obliquely, and the bottom of which is arranged at the liquid inlet end of the separation component.

6. The one-stage nitration liquid separator according to claim 5, characterized in that: The baffle plate and the liquid outlet end of the second connecting pipe are arranged at an angle.

7. The one-stage nitration liquid separator according to any one of claims 1 to 4, characterized in that: The temperature adjustment component is a cooling coil, and cooling water flows through the cooling coil.

8. The one-stage nitration liquid separator according to any one of claims 1 to 4, characterized in that: The separation component is an inclined plate separator.

9. The one-stage nitration liquid separator according to any one of claims 1 to 4, characterized in that: The upper discharge port is connected with a receiving groove, the receiving groove opens upward and is connected to the second receiving cavity.

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