Dichlorohydrin recovery device

Abstract

The utility model relates to a dichloropropanol recovery device. The dichloropropanol recovery device comprises a recovery kettle, a reboiler, a cooler and a recovery tank, the side wall of the top of the recovery kettle is provided with a feeding pipeline which is communicated with the inside and is used for feeding materials; a material conveying pipeline used for communication is arranged between the recovery kettle and the reboiler, and a circulating pump is arranged on the material conveying pipeline and used for pumping materials in the recovery kettle into the reboiler; the top of the reboiler is communicated with the side wall of the top of the recovery kettle through a steam outlet pipeline; the top of the recovery kettle is communicated with the top of the cooler through a steam conveying pipeline; and the bottom of the cooler is communicated with the top of the recovery tank through a liquid conveying pipeline. The device has the effects of reducing the waste of dichloropropanol, increasing the yield of the device and reducing the unit consumption of raw materials.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of chemical equipment, in particular to a dichloropropanol recovery device. BACKGROUND

[0002] Dichloropropanol is an important organic intermediate, which is an important raw material for synthesizing ganciclovir in the medical field, can be used as an intermediate for synthesizing famotidine, and is one of raw materials for synthesizing fluconazole. In the chemical industry, dichloropropanol is a key intermediate for producing epoxide chloropropane. Dichloropropanol can be used to manufacture crosslinking agents of some high molecular materials, which can improve the strength, heat resistance, corrosion resistance and other properties of the materials, and is widely used in the rubber and plastic industries. Dichloropropanol is used in the production process of some water treatment agents, which helps to improve the purification effect and stability of the water treatment agent on water quality. In addition, dichloropropanol has important applications in the fields of surfactants, dye intermediates and metal surface treatment.

[0003] When dichloropropanol is distilled in the dichloropropanol tower, a part of dichloropropanol is contained in the kettle, and after separation by the layered tank, the bottom material is directly sent to the incinerator for incineration treatment. About 13% of dichloropropanol in the bottom material of the layered tank is directly treated, which causes waste of the intermediate product dichloropropanol and affects the yield.

[0004] According to the related technology in the above, the dichloropropanol material at the bottom of the layered tank is directly sent to the incinerator for incineration treatment, so that more dichloropropanol is wasted. Content of the utility model

[0005] In order to reduce the waste of dichloropropanol, the application provides a dichloropropanol recovery device.

[0006] The dichloropropanol recovery device provided by the application adopts the following technical scheme:

[0007] A dichloropropanol recovery device, comprising a recovery kettle, a reboiler, a cooler and a recovery tank; a feed line for feeding material into the inside is arranged on the side wall of the top of the recovery kettle;

[0008] A feed line for communication is arranged between the recovery kettle and the reboiler, and a circulating pump is arranged on the feed line, which is used for pumping the material in the recovery kettle into the reboiler;

[0009] The top of the reboiler is communicated with the top side wall of the recovery kettle through a steam outlet line; the top of the recovery kettle is communicated with the top of the cooler through a steam conveying line; and the bottom of the cooler is communicated with the top of the recovery tank through a liquid conveying line.

[0010] By adopting the technical scheme, the dichloropropanol material after being layered in the layered tank is input into the recovery kettle from the feed pipeline, the dichloropropanol material in the recovery kettle is pumped into the reboiler by the circulating pump for distillation, the dichloropropanol vapor after being distilled can be transported from the top of the reboiler to the top of the recovery kettle, and then transported to the cooler through the top of the recovery kettle, and then flowed into the recovery tank after being cooled by the cooler. The dichloropropanol in the dichloropropanol material can be recovered.

[0011] Optionally, the bottom of the recovery kettle is provided with a stripping steam pipeline communicating with the inside, and a stripping steam control valve is arranged on the stripping steam pipeline.

[0012] By adopting the technical scheme, when the liquid level of the dichloropropanol material in the recovery kettle changes little, the steam is introduced into the recovery kettle through the stripping steam pipeline, so that the steam can directly contact the dichloropropanol material, and the dichloropropanol material is distilled to extract the remaining dichloropropanol.

[0013] Optionally, the recovery kettle is provided with a liquid level meter for detecting the liquid level of the material, and the liquid level meter and the recovery kettle are connected through a quick joint.

[0014] By adopting the technical scheme, the liquid level meter is arranged to enable the liquid level change in the recovery kettle to be observed more intuitively, and the quick joint is arranged to enable the liquid level meter to be detachably installed on the recovery kettle, so as to facilitate replacement of the liquid level meter.

[0015] Optionally, the quick joint comprises female joints arranged at two ends of the liquid level meter and a male joint communicating with the inside of the recovery kettle and cooperating with the female joint; the female joint comprises a joint pipe communicating with the liquid level meter, a plurality of limiting balls arranged in a circumferential direction of the joint pipe, a limiting sleeve sleeved on an end portion of the joint pipe and used for abutting cooperation with the limiting balls, an abutting spring sleeved on the joint pipe, and a sealing ring arranged on an inner side wall of the joint pipe and used for cooperating with the male joint; the male joint is circumferentially provided with a clamping groove used for clamping cooperation with the limiting balls; an outer side wall of the joint pipe is provided with a limiting convex ring, one end of the abutting spring abuts against the limiting convex ring, and the other end abuts against an inner end face of the limiting sleeve, so as to drive the limiting sleeve to always have a tendency to move away from the liquid level meter.

[0016] By adopting the technical scheme, the specific structure of the quick connector is disclosed. Before the female connector is sleeved on the male connector, the limiting sleeve is moved towards the liquid level meter, so that the abutting spring is compressed. At this time, the connector pipe sleeve is sleeved on the male connector, so that the end of the male connector abuts against the sealing ring. The limiting sleeve can be moved away from the liquid level meter under the action of the abutting spring, so that the limiting ball is squeezed into the clamping groove, and the inner side wall of the limiting sleeve can abut against the limiting ball, so that the limiting ball always abuts against the clamping groove, so as to realize the connection and fixation between the connector pipe and the male connector.

[0017] Optionally, the reboiler is provided with a steam input pipeline on the sidewall of the upper portion for steam to enter and a steam output pipeline on the sidewall of the lower portion for steam to output, and a first steam control valve is arranged on the steam input pipeline, and a second steam control valve is arranged on the steam output pipeline.

[0018] By adopting the technical scheme, steam is introduced into the reboiler, so that dichloropropanol in the reboiler can be distilled. The arrangement of the steam control valve enables the amount of steam to be controlled, so that the distillation process is more stable.

[0019] Optionally, a waste liquid pipeline is arranged between the circulating pump and the reboiler, and a waste liquid control valve is arranged on the waste liquid pipeline.

[0020] By adopting the technical scheme, after most of the dichloropropanol material in the recovery kettle is distilled, the dichloropropanol waste in the recovery kettle can be output from the waste liquid pipeline to the incinerator by the circulating pump for incineration.

[0021] Optionally, the cooler is provided with a water inlet pipeline at the sidewall of the upper portion and a water outlet pipeline at the sidewall of the lower portion.

[0022] By adopting the technical scheme, the arrangement of the water inlet pipeline and the water outlet pipeline enables cooling water to continuously enter the cooler, so that the dichloropropanol steam entering the cooler can be continuously cooled and liquefied.

[0023] Optionally, the recovery tank is provided with a tail gas pipeline communicating with the inside.

[0024] By adopting the technical scheme, the arrangement of the tail gas pipeline enables the tail gas in the recovery tank to be discharged through the tail gas pipeline.

[0025] Optionally, the bottom of the recovery tank is provided with a material transfer pipeline for transferring dichloropropanol located in the recovery tank.

[0026] By adopting the technical scheme, the arrangement of the material transfer pipeline enables dichloropropanol in the recovery tank to be transferred through the material transfer pipeline.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. A dichloropropanol recovery device, by adding dichloropropanol material into the recovery kettle, the circulating pump pumps the dichloropropanol in the recovery kettle into the reboiler, the reboiler distills the dichloropropanol material, so that the dichloropropanol vapor is input from the top of the recovery kettle, then transported to the cooler from the top of the recovery kettle, liquefied after cooling in the cooler, and finally flows into the recovery tank, so as to extract the dichloropropanol in the dichloropropanol material;

[0029] 2. By setting a stripping steam pipeline at the bottom of the recovery kettle, when the dichloropropanol content in the dichloropropanol material in the recovery kettle is low, steam is introduced into the recovery kettle through the stripping steam pipeline, so that the steam directly contacts with the dichloropropanol material, to realize stripping of the dichloropropanol;

[0030] 3. By setting a liquid level meter on the recovery kettle, the liquid level of the dichloropropanol material in the recovery kettle can be obtained more intuitively. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application.

[0032] Figure 2 is a schematic diagram of the recovery kettle in the embodiment of the present application.

[0033] Figure 3 is a schematic diagram of the quick connector in the embodiment of the present application.

[0034] Figure 4 is a schematic diagram of the circulating pump in the embodiment of the present application.

[0035] Figure 5 is a schematic diagram of the reboiler in the embodiment of the present application.

[0036] Explanation of reference signs: 1, recovery kettle; 11, feed line; 111, feed control valve; 12, feed line; 121, first line; 1211, first feed control valve; 1212, second feed control valve; 122, second line; 1221, third control valve; 13, steam outlet line; 14, steam feed line; 15, stripping steam line; 151, stripping steam control valve; 2, circulating pump; 3, reboiler; 31, steam input line; 311, first steam control valve; 32, steam output line; 321, second steam control valve; 4, cooler; 41, water inlet line; 411, water inlet control valve; 42, water outlet line; 421, water outlet control valve; 43, liquid feed line; 5, recovery tank; 51, tail gas line; 511, tail gas valve; 52, transfer line; 521, transfer valve; 6, liquid level meter; 7, quick coupling; 71, female coupling; 711, coupling pipe; 7111, ball hole; 7112, ball limiting ring; 7113, limiting convex ring; 712, limiting ball; 713, abutting spring; 714, limiting sleeve; 7141, limiting main body; 7142, limiting part; 7143, abutting part; 71431, guide ring surface; 715, sealing ring; 72, male coupling; 721, clamping groove; 722, sealing groove; 8, waste liquid line; 81, waste liquid control valve. DETAILED DESCRIPTION

[0037] The following will be described in detail with reference to the accompanying drawings. Figures 1-5 The application is further described in detail.

[0038] The embodiment of the application discloses a dichloropropanol recovery device.

[0039] Reference will be made to Figure 1 The dichloropropanol recovery device comprises a recovery kettle 1, a circulating pump 2, a reboiler 3, a cooler 4 and a recovery tank 5.

[0040] Reference will be made to Figure 1 A feed line 11 in communication with the inside is arranged on the side wall of the top of the recovery kettle 1, and the other end of the feed line 11 is connected with a layered tank, so that dichloropropanol material at the bottom of the layered tank can be transported into the recovery kettle 1. A feed control valve 111 is arranged on the feed line 11.

[0041] Reference will be made to Figure 1 and Figure 2 A liquid level meter 6 is further arranged on the outside of the recovery kettle 1, for monitoring the liquid level height of dichloropropanol material in the recovery kettle 1. The liquid level meter 6 and the recovery kettle 1 are connected through a quick coupling 7.

[0042] Reference will be made to Figure 1 and Figure 3, the quick joint 7 comprises a female joint 71 arranged at two ends of the liquid level meter 6 and a male joint 72 arranged on the outer wall of the recovery kettle 1 and communicated with the inside of the recovery kettle 1. The female joint 71 comprises a joint pipe 711 communicated with the liquid level meter 6, a plurality of limiting balls 712 circumferentially arranged in the joint pipe 711 away from the liquid level meter 6, an abutting spring 713 sleeved on the outer wall of the male joint 72, a limiting sleeve 714 sleeved on the outer side of the joint pipe 711 and a sealing ring 715 arranged in the joint pipe 711.

[0043] With reference to Figure 1 and Figure 3 , the joint pipe 711 is circumferentially provided with a plurality of ball holes 7111 penetrating the inner and outer surfaces at the end away from the liquid level meter 6, and the limiting balls 712 are arranged in the ball holes 7111. Among them, the diameter of the ball hole 7111 towards the inner wall of the joint pipe 711 is smaller than the diameter of the outer wall of the joint pipe 711, so as to avoid the limiting balls 712 from escaping from the ball hole 7111 towards the inside of the joint pipe 711. The joint pipe 711 is provided with a ball limiting ring 7112 at the end away from the liquid level meter 6, and the outer wall of the joint pipe 711 is further provided with a limiting convex ring 7113.

[0044] With reference to Figure 1 and Figure 3 , the limiting sleeve 714 comprises a limiting main body 7141, a limiting portion 7142 arranged in the limiting main body 7141 towards the liquid level meter 6 and an abutting portion 7143 arranged in the limiting main body 7141 away from the liquid level meter 6. The abutting portion 7143 is further provided with an inclined guide ring surface 71431 on the side away from the liquid level meter 6. The limiting convex ring 7113 is located between the limiting portion 7142 and the abutting portion 7143. Among them, one end of the abutting spring 713 abuts on the end of the limiting portion 7142 away from the liquid level meter 6, and the other end of the abutting spring 713 abuts on the end of the abutting portion 7143 close to the liquid level meter 6, so as to drive the limiting sleeve 714 to always have a tendency to move away from the liquid level meter 6. When the limiting portion 7142 abuts on the limiting convex ring 7113, the abutting portion 7143 is located on the upper side of the ball hole 7111, and the bottom of the abutting portion 7143 abuts on the limiting ball 712.

[0045] With reference to Figure 1 and Figure 3 , the outer wall of the male joint 72 is provided with a clamping groove 721 for clamping the limiting ball 712. The end of the male joint 72 is further provided with a sealing groove 722, when the connecting pipe is inserted into the joint pipe 711, the limiting ball 712 can be clamped into the clamping groove 721, and the groove bottom of the sealing groove 722 can abut on the sealing ring 715.

[0046] With reference to Figure 1 and Figure 3When the female joint 71 is fitted on the male joint 72, the limiting sleeve 714 is pushed towards the liquid level meter 6, thereby compressing the abutting spring 713, at this time, the abutting part 7143 is separated from the upper end opening of the ball hole 7111, so that the limiting ball 712 can move up and down. When the groove bottom of the sealing groove 722 of the male joint 72 abuts against the sealing ring 715, the limiting sleeve 714 is loosened, and the limiting sleeve 714 can move towards the recovery kettle 1 under the action of the abutting spring 713, the guide ring surface 71431 can drive the limiting ball 712 to move towards the bottom of the ball hole 7111, and the bottom of the limiting ball 712 can be clamped into the clamping groove 721. When the limiting part 7142 abuts against the limiting convex ring 7113, the bottom of the abutting part 7143 can abut against the limiting ball 712, thereby limiting the limiting ball 712 from being separated from the clamping groove 721, so as to fix the female joint 71 and the male joint 72.

[0047] With reference to Figure 1 And Figure 4 The bottom of the recovery kettle 1 and the reboiler 3 are communicated through the feed pipeline 12. The feed pipeline 12 includes a first pipeline 121 and a second pipeline 122, one end of the first pipeline 121 away from the recovery kettle 1 is communicated with one end of the circulating pump 2, and the other end of the second pipeline 122 away from the reboiler 3 is communicated with the other end of the circulating pump 2. Among them, the first pipeline 121 is provided with a first feed control valve 1211 at the end close to the recovery kettle 1 and a second feed control valve 1212 at the end close to the circulating pump 2. When the first feed control valve 1211 and the second feed control valve 1212 are both opened, the dichloropropanol material in the recovery kettle 1 can be pumped into the reboiler 3 for distillation. The second pipeline 122 is also provided with a third control valve 1221 at the side close to the circulating pump 2.

[0048] With reference to Figure 1 The top of the recovery kettle 1 is provided with a steam outlet pipeline 13 communicated with and a steam conveying pipeline 14 communicated with the cooler 4. After the dichloropropanol material is distilled in the reboiler 3, dichloropropanol steam can be generated, which can be input from the top of the reboiler 3 to the top inside of the recovery kettle 1 along the steam outlet pipeline 13, and then the dichloropropanol steam is conveyed to the cooler 4 along the steam conveying pipeline 14 from the top of the recovery kettle 1. Among them, the liquefied dichloropropanol in the process of passing through the steam outlet pipeline 13 and the inside of the recovery kettle 1 can flow back into the recovery kettle 1.

[0049] With reference to Figure 1 And Figure 5The reboiler 3 is provided with a steam input pipeline 31 on the upper side wall and a first steam control valve 311 on the steam input pipeline 31. The reboiler 3 is provided with a steam output pipeline 32 on the lower side wall and a second steam control valve 321 on the steam output pipeline 32. By continuously inputting steam from the steam input pipeline 31 into the reboiler 3, the dichloropropanol material in the reboiler 3 can be continuously distilled. By controlling the opening and closing degrees of the first steam control valve 311 and the second steam control valve 321, the temperature in the reboiler 3 can be controlled.

[0050] Referring to Figure 1 and Figure 2 , the bottom of the recovery kettle 1 is also provided with a stripping steam pipeline 15 communicating with the inside, and a stripping steam control valve 151 is arranged on the stripping steam pipeline 15. When the dichloropropanol material in the recovery kettle 1 is distilled by the reboiler 3, the concentration of dichloropropanol in the dichloropropanol material is low, and the effect of distillation by the reboiler 3 is not obvious, that is, the liquid level change of the liquid level meter 6 is not obvious, the first material feeding control valve 1211, the second material feeding control valve 1212, the circulating pump 2 and the reboiler 3 are closed, and steam is introduced into the recovery kettle 1 through the stripping steam pipeline 15, so that the steam directly contacts with the dichloropropanol material to strip the dichloropropanol and further extract the dichloropropanol.

[0051] Referring to Figure 1 and Figure 4 , in order to be able to discharge the waste liquid in the recovery kettle 1, the second pipeline 122 is communicated with a waste liquid pipeline 8 and a waste liquid control valve 81 is arranged on the waste liquid pipeline 8. When the concentration of dichloropropanol in the dichloropropanol material in the recovery kettle 1 is lower than 1%, the dichloropropanol material in the recovery kettle 1 is pumped out by the circulating pump 2 and flows out from the waste liquid pipeline 8 for incineration.

[0052] Referring to Figure 1 , the upper side wall of the cooler 4 is provided with a water inlet pipeline 41 and a water inlet control valve 411 is arranged on the water inlet pipeline 41. The lower side wall of the cooler 4 is provided with a water outlet pipeline 42 and a water outlet control valve 421 is arranged on the water outlet pipeline 42. The bottom of the cooler 4 is communicated with the top of the recovery tank through a liquid conveying pipeline 43. When the dichloropropanol steam enters the cooler 4 from the steam conveying pipeline 14, the cooler 4 can liquefy the dichloropropanol, and the liquefied dichloropropanol can flow into the recovery tank 5 along the liquid conveying pipeline 43.

[0053] Referring to Figure 1 , the top of the recovery tank 5 is provided with a tail gas pipeline 51 communicating with the inside, and a tail gas valve 511 is arranged on the tail gas pipeline 51. The side wall of the recovery tank 5 is also provided with a material moving pipeline 52, and a material moving valve 521 is arranged on the material moving pipeline 52. The dichloropropanol in the recovery tank 5 can be extracted by controlling the opening and closing degrees of the material moving valve 521.

[0054] In combination Figures 1 to 5 The implementation principle of the dichloropropanol recovery device is as follows: dichloropropanol material is delivered into the recovery kettle 1, the circulating pump 2 pumps the dichloropropanol material in the recovery kettle 1 into the reboiler 3. Steam enters the reboiler 3 from the steam input pipeline 31, so that the dichloropropanol material can be distilled. The distilled dichloropropanol vapor is delivered into the top of the recovery kettle 1 from the vapor delivery pipeline 14, wherein most of the dichloropropanol vapor is delivered into the cooler 4 along the vapor delivery pipeline 14 at the top, and a small amount of dichloropropanol liquefied due to cooling can return to the dichloropropanol material in the recovery kettle 1. When the liquid level in the liquid level gauge 6 does not change significantly, the reboiler 3 is closed, and steam is introduced into the recovery kettle 1 through the stripping steam pipeline 15, so that the steam directly contacts the dichloropropanol material, thereby stripping the dichloropropanol. The cooler 4 can cool the dichloropropanol vapor to liquefy the dichloropropanol vapor, which finally flows into the recovery tank 5.

[0055] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made on the basis of the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A dichloropropanol recovery apparatus, characterized by, The recovery kettle (1), reboiler (3), cooler (4) and recovery tank (5) are included; the recovery kettle (1) is provided with a feeding pipeline (11) on the side wall of the top for feeding materials into the interior; A feeding pipeline (12) is arranged between the recovery kettle (1) and the reboiler (3) for communication, and a circulating pump (2) is arranged on the feeding pipeline (12) for pumping the materials in the recovery kettle (1) into the reboiler (3); The top of the reboiler (3) is communicated with the top side wall of the recovery kettle (1) through a steam outlet pipeline (13); the top of the recovery kettle (1) is communicated with the top of the cooler (4) through a steam feeding pipeline (14); and the bottom of the cooler (4) is communicated with the top of the recovery tank (5) through a liquid feeding pipeline (43).

2. A dichloropropanol recovery apparatus according to claim 1, wherein The bottom of the recovery kettle (1) is provided with a stripping steam pipeline (15) communicated with the interior, and the stripping steam pipeline (15) is provided with a stripping steam control valve (151).

3. A dichloropropanol recovery apparatus according to claim 1, wherein The recovery kettle (1) is provided with a liquid level meter (6) for detecting the liquid level of the materials, and the liquid level meter (6) and the recovery kettle (1) are connected through a quick connector (7).

4. A dichloropropanol recovery apparatus according to claim 3, wherein The quick connector (7) includes a female connector (71) arranged at both ends of the liquid level meter (6) and a male connector (72) communicated with the interior of the recovery kettle (1) and matched with the female connector (71); the female connector (71) includes a connector pipe (711) communicated with the liquid level meter (6), a plurality of limiting balls (712) circumferentially arranged on the connector pipe (711), a limiting sleeve (714) sleeved on the end of the connector pipe (711) and used for abutting matching with the limiting balls (712), an abutting spring (713) sleeved on the connector pipe (711), and a sealing ring (715) arranged on the inner side wall of the connector pipe (711) and used for matching with the male connector (72); the male connector (72) is circumferentially provided with a clamping groove (721) used for clamping matching with the limiting balls (712); the outer side wall of the connector pipe (711) is provided with a limiting convex ring (7113), one end of the abutting spring (713) abuts against the limiting convex ring (7113) and the other end abuts against the inner end face of the limiting sleeve (714), so as to drive the limiting sleeve (714) to always have a tendency to move away from the liquid level meter (6).

5. A dichloropropanol recovery apparatus according to claim 1, wherein The reboiler (3) is provided with a steam input pipeline (31) on the side wall of the upper part for feeding steam and a steam output pipeline (32) on the side wall of the lower part for outputting steam, the steam input pipeline (31) is provided with a first steam control valve (311), and the steam output pipeline (32) is provided with a second steam control valve (321).

6. A dichloropropanol recovery apparatus according to claim 1, wherein The feeding pipeline (12) is provided with a waste liquid pipeline (8) between the circulating pump (2) and the reboiler (3), and a waste liquid control valve (81) is arranged on the waste liquid pipeline (8).

7. A dichloropropanol recovery apparatus according to claim 1, wherein The cooler (4) is provided with an inlet water pipeline (41) at the upper side wall and an outlet water pipeline (42) at the lower side wall.

8. A dichloropropanol recovery apparatus according to claim 1, wherein The top of the recovery tank (5) is provided with a tail gas pipeline (51) communicating with the inside.

9. A dichloropropanol recovery apparatus according to claim 1, wherein The bottom of the recovery tank (5) is provided with a material transfer pipeline (52) for transferring dichloropropanol in the recovery tank (5).

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