Alkali washing device for isooctyl nitrate crude product

Abstract

The utility model belongs to the technical field of isooctyl nitrate production equipment, and discloses an isooctyl nitrate crude product alkali washing device which comprises a fiber membrane contactor and a separation tank which are communicated, the top of the fiber membrane contactor is provided with a first liquid inlet pipe used for leading in an isooctyl nitrate crude product and a second liquid inlet pipe used for leading in alkali liquor, and the first liquid inlet pipe and the second liquid inlet pipe are communicated with each other. The first liquid inlet pipe penetrates along the top of the fiber membrane contactor, a buffer mechanism is arranged below the first liquid inlet pipe, the buffer mechanism comprises a splitter plate and a buffer cavity with an opening in the top, a pipe opening of the first liquid inlet pipe is located in the buffer cavity, the buffer cavity is formed in the center of the top of the splitter plate, and through holes are evenly distributed in the splitter plate. According to the utility model, the buffer cavity is matched with the splitter plate to buffer the crude isooctyl nitrate introduced into the fibrous membrane contactor, so that the generation of foam is reduced, and the crude isooctyl nitrate is ensured to be fully deacidified.

Description

TECHNICAL FIELD

[0001] The utility model belongs to nitric acid isooctyl ester production equipment technical field, especially relates to a nitric acid isooctyl ester crude product caustic washing device. BACKGROUND

[0002] The nitric acid isooctyl ester production includes isooctyl alcohol purification, mixed acid preparation, digestion reaction, caustic washing acid removal, washing and drying, wherein, the nitric acid isoooctyl ester crude product is obtained after digestion reaction, needs to utilize lye to neutralize residual acid, the equipment generally selected is adopted fiber membrane contactor and separation tank, the lye is contacted with the nitric acid isoooctyl ester crude product in the fiber membrane contactor and is deacidified, and the nitric acid isooctyl ester and the lye are guided out after being separated in layers in the separation tank.

[0003] Because the nitric acid isooctyl ester crude product contains unreacted mononitrate, free acid (such as nitric acid) or residual catalyst (such as sulfuric acid), foam is easily generated by collision when entering the fiber membrane contactor, the foam is easy to block the liquid-liquid contact interface, and the lye and the nitric acid isooctyl ester crude product contact deacidification is affected. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of nitric acid isooctyl ester crude product caustic washing device, to solve the problem that the nitric acid isooctyl ester crude product enters fiber membrane contactor and is collided to generate foam in prior art in the above background art, and then affect the lye and the nitric acid isooctyl ester crude product contact deacidification.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0006] A kind of nitric acid isooctyl ester crude product caustic washing device, including the fiber membrane contactor and separation tank of intercommunication, the top of the fiber membrane contactor is equipped with the first liquid inlet pipe for guiding into nitric acid isooctyl ester crude product respectively, and the second liquid inlet pipe for guiding into lye, the first liquid inlet pipe is penetrated along the top of fiber membrane contactor, and buffer mechanism is arranged below the first liquid inlet pipe, the buffer mechanism includes shunt plate and the buffer cavity with top opening, the tube opening of the first liquid inlet pipe is located in the buffer cavity, the buffer cavity is arranged in the top center of shunt plate, and the shunt plate is evenly arranged with through hole.

[0007] Further, the lower portion of the shunt plate is provided with a plurality of ring tubes nested from outside to inside, the ring tubes are communicated with each other, the outermost ring tube is connected with the inner wall of the fiber membrane contactor, the second liquid inlet pipe is communicated with the outermost ring tube, and the bottom of the ring tube is provided with a liquid outlet hole.

[0008] Further, the support rod is arranged between the buffer cavity and the inner wall of the fiber membrane contactor, the shunt plate is sleeved outside the buffer cavity and is vertically slidably connected with the inner wall of the fiber membrane contactor, the outer side of the fiber membrane contactor is provided with an electric telescopic rod, the telescopic end of the electric telescopic rod penetrates into the fiber membrane contactor and is vertically connected with the shunt plate, and the bottom of the shunt plate is provided with a semicircular annular pipe which is located above the gap between adjacent ring pipes and has a diameter greater than the interval of the adjacent ring pipes.

[0009] Compared with the defects and deficiencies of the prior art, the utility model has the following beneficial effects.

[0010] 1. The utility model provides a nitric acid isooctyl ester crude product caustic washing device, nitric acid isooctyl ester crude product is introduced into the fiber membrane contactor by the first liquid inlet pipe, because the pipe orifice of the first liquid inlet pipe is located in the buffer cavity, and the nitric acid isooctyl ester crude product is overflowed to the shunt plate after buffering in the buffer cavity, the nitric acid isooctyl ester crude product is uniformly dispersed after the shunt plate and flows down to the through -hole, and the buffering mechanism effectively buffers the nitric acid isooctyl ester crude product into the fiber membrane contactor, thereby reducing the generation of foam, and guaranteeing that the lye and nitric acid isooctyl ester crude material react and remove acid.

[0011] 2. The ring pipe cooperates with the shunt plate of interval nested layout, which is helpful for the uniform distribution of the lye and nitric acid isooctyl ester crude product and downward flow, the electric telescopic rod drives the shunt plate to slide, the interval of the semicircular annular pipe and the ring pipe is adjusted, thereby the flow of the nitric acid isooctyl ester crude product is regulated, which is helpful for the nitric acid isooctyl ester crude product and lye to fully contact and remove acid. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structure schematic view of the nitric acid isooctyl ester crude product caustic washing device in the utility model.

[0013] Figure 2 It is a structure schematic view of the ring pipe arranged in the fiber membrane contactor in the utility model.

[0014] Figure 3 It is a structure schematic view of the buffering mechanism arranged in the fiber membrane contactor in the utility model.

[0015] Figure 4 It is a connection structure schematic view of the buffer cavity and the shunt plate in the utility model.

[0016] Figure 5 It is a structure schematic view of the semicircular annular pipe arranged on the bottom surface of the shunt plate in the utility model.

[0017] In the figure: 1, fiber membrane contactor; 11, sliding rail; 2, separation tank; 3, first liquid inlet pipe; 4, second liquid inlet pipe; 5, liquid homogenizing mechanism; 51, ring pipe; 52, liquid outlet hole; 6, buffer mechanism; 61, buffer cavity; 62, flow distribution plate; 63, through hole; 64, electric telescopic rod; 65, semicircular ring pipe; 66, chute. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail with the help of the drawings and examples. It should be understood that the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0019] Reference Figures 1-3 A kind of crude isooctyl nitrate caustic washing device, including fiber membrane contactor 1 and separation tank 2 communicated sequentially, lye is introduced from the upper portion of fiber membrane contactor 1, lye has begun to circulate before starting deacidification, to wet the metal fiber in fiber membrane contactor 1, lye flows along metal fiber downward and forms liquid film, crude isooctyl nitrate is introduced from the top of fiber membrane contactor 1, isooctyl nitrate is contacted with lye, so that excess acid in crude product is extracted into lye, after caustic washing deacidification, isooctyl nitrate and lye flow into separation tank 2, organic phase isooctyl nitrate floats, aqueous phase lye containing salt sinks to the bottom of separation tank 2, isooctyl nitrate is led out along the upper outlet of separation tank 2, lye is led out through the lower outlet of separation tank 2.

[0020] Fiber membrane contactor 1 top has first liquid inlet pipe 3, first liquid inlet pipe 3 is used to introduce crude isooctyl nitrate, the bottom of fiber membrane contactor 1 is communicated with the top of separation tank 2 on one side, and liquid homogenizing mechanism 5 is arranged below first liquid inlet pipe 3.

[0021] Liquid homogenizing mechanism 5 includes ring pipes 51 that are sequentially sleeved from outside to inside, the ring pipes 51 are communicated, connecting rods are arranged between the ring pipes 51, the outermost ring pipe 51 is fixed to the inner wall of fiber membrane contactor 1, the vertical side wall of fiber membrane contactor 1 is provided with second liquid inlet pipe 4, the second liquid inlet pipe 4 is communicated with the outermost ring pipe 51, the second liquid inlet pipe 4 is communicated with lye supply pipeline, the bottom of the ring pipe 51 is uniformly provided with liquid outlet hole 52, after lye flows into the ring pipe 51, the lye flows to fiber membrane filament through the liquid outlet hole 52, and the spacing between different adjacent ring pipes 51 is the same.

[0022] The upper portion of the ring pipe 51 is provided with buffer mechanism 6, the buffer mechanism 6 includes buffer cavity 61 with an open top and flow distribution plate 62, the bottom end of first liquid inlet pipe 3 is located in buffer cavity 61, the side wall of buffer cavity 61 is higher than the bottom end of first liquid inlet pipe 3, the buffer cavity 61 is arranged on the top surface of flow distribution plate 62, the edge of flow distribution plate 62 is connected with the inner wall of fiber membrane contactor 1, and flow distribution plate 62 is uniformly provided with through hole 63.

[0023] The crude isooctyl nitrate enters the fiber membrane contactor 1 through the first liquid inlet pipe 3, overflows to the flow divider plate 62 through the side wall of the buffer chamber 61, and flows downward through the through holes 63 uniformly arranged on the flow divider plate 62. On the one hand, it helps to reduce the foam generated when the crude isooctyl nitrate enters the fiber membrane contactor 1, and on the other hand, it helps to uniformly disperse the crude isooctyl nitrate.

[0024] In one embodiment, referring to Figure 4 and Figure 5 , the flow divider plate 62 is slidingly sleeved on the vertical side wall of the buffer chamber 61, and the flow divider plate 62 is slidingly connected with the inner wall of the fiber membrane contactor 1. Specifically, the inner wall of the fiber membrane contactor 1 is provided with a plurality of slide rails 11 arranged uniformly along the circumferential direction of the inner wall of the fiber membrane contactor 1, and the edge of the flow divider plate 62 is provided with a sliding groove 66 slidingly matched with the slide rails 11. A support rod is arranged between the buffer chamber 61 and the inner wall of the fiber membrane contactor 1, and the support rod is used to fix the position of the buffer chamber 61. An electric telescopic rod 64 is arranged outside the fiber membrane contactor 1, the telescopic end of the electric telescopic rod 64 penetrates into the fiber membrane contactor 1 along the vertical direction, and the end thereof is connected with the top surface of the flow divider plate 62 perpendicularly. The bottom of the flow divider plate 62 is provided with a plurality of semicircular ring pipes 65, and the semicircular ring pipes 65 are arranged above the gaps between adjacent ring pipes 51. The plurality of semicircular ring pipes 65 are arranged in a spaced nested manner, and the diameter of the semicircular ring pipe 65 is greater than the distance between adjacent ring pipes 51. The flow divider plate 62 always keeps slidingly matched with the buffer chamber 61.

[0025] The flow divider plate 62 is driven by the electric telescopic rod 64 to slide vertically along the side wall of the buffer chamber 61, so as to adjust the distance between the semicircular ring pipes 65 and the ring pipes 51. When the flow divider plate 62 is driven by the electric telescopic rod 64 to move downward, the semicircular ring pipes 65 gradually approach the gaps between adjacent ring pipes 51, and the distance between the ring pipes 51 and the semicircular ring pipes 65 gradually decreases, thereby reducing the flow of the crude isooctyl nitrate. When the flow divider plate 62 is driven by the electric telescopic rod 64 to move upward, the semicircular ring pipes 65 gradually move away from the gaps between adjacent ring pipes 51, and the distance between the ring pipes 51 and the semicircular ring pipes 65 gradually increases, thereby increasing the flow of the crude isooctyl nitrate.

[0026] The control of the electric telescopic rod 64 can adopt a PLC controller or remote control, and the specific control mode belongs to the prior art, which will not be described again.

[0027] It should be noted that the electric telescopic rod 64 can be selected from the Thomson Electrak® HD series. The rod body of the electric telescopic rod 64 located in the fiber membrane contactor 1 can be sleeved with an acid and alkali resistant telescopic sheath to ensure the normal use of the electric telescopic rod 64. The sheath material can be selected from silica glass fiber cloth.

[0028] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for caustic washing of crude isooctyl nitrate, comprising a communicating fiber membrane contactor (1) and a separation tank (2), the top of the fiber membrane contactor (1) is provided with a first liquid inlet pipe (3) for introducing crude isooctyl nitrate and a second liquid inlet pipe (4) for introducing caustic liquid, characterized in that, The first liquid inlet pipe (3) penetrates along the top of the fiber membrane contactor (1), and a buffer mechanism (6) is arranged below the first liquid inlet pipe (3), wherein the buffer mechanism (6) comprises a shunt plate (62) and a top-opened buffer cavity (61), the pipe opening of the first liquid inlet pipe (3) is located in the buffer cavity (61), the buffer cavity (61) is arranged at the top center of the shunt plate (62), and the shunt plate (62) is uniformly provided with through holes (63).

2. The crude isooctyl nitrate caustic wash unit of claim 1 wherein, A plurality of ring pipes (51) are arranged below the shunt plate (62) and are spaced and nested from outside to inside, the ring pipes (51) are communicated with each other, the outermost ring pipe (51) is connected with the inner wall of the fiber membrane contactor (1), the second liquid inlet pipe (4) is communicated with the outermost ring pipe (51), and the bottom of the ring pipe (51) is provided with a liquid outlet hole (52).

3. The crude isooctyl nitrate caustic wash apparatus of claim 2, wherein, A supporting rod is arranged between the buffer cavity (61) and the inner wall of the fiber membrane contactor (1), the shunt plate (62) is slidingly sleeved outside the buffer cavity (61), the shunt plate (62) is slidingly matched with the inner wall of the fiber membrane contactor (1) in the vertical direction, an electric telescopic rod (64) is arranged outside the fiber membrane contactor (1), the telescopic end of the electric telescopic rod (64) penetrates into the fiber membrane contactor (1) and is connected with the shunt plate (62) in the vertical direction, the bottom of the shunt plate (62) is provided with a semicircular ring pipe (65), the semicircular ring pipe (65) is located above the gap between adjacent ring pipes (51), and the diameter of the semicircular ring pipe (65) is greater than the spacing between adjacent ring pipes (51).

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