CN218372128U - N, N' -dicyclohexylcarbodiimide production system - Google Patents
N, N' -dicyclohexylcarbodiimide production system Download PDFInfo
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- CN218372128U CN218372128U CN202123368716.1U CN202123368716U CN218372128U CN 218372128 U CN218372128 U CN 218372128U CN 202123368716 U CN202123368716 U CN 202123368716U CN 218372128 U CN218372128 U CN 218372128U
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Abstract
The utility model belongs to the technical field of N, N '-dicyclohexylcarbodiimide production, in particular to an N, N' -dicyclohexylcarbodiimide production system, a high-pressure reaction kettle is connected with a carbon disulfide dropping line, the upper part of the high-pressure reaction kettle is provided with an exhaust port, the exhaust port is connected with a series-connected multi-stage spray absorption tower, the bottom of each stage of spray absorption tower is connected with a corresponding spray pond, the spray pond is connected with the upper part of the spray absorption tower, an alkali liquor replenishing tank is connected with each stage of spray pond in sequence, and a first stage of spray pond is connected with a recovery tank; the discharge port of the high-pressure reaction kettle is connected with the second reaction kettle through a filter, the recovery tank is connected with the second reaction kettle, the discharge port of the second reaction kettle is connected with the washing kettle, an alkali liquor washing line is connected onto the washing kettle, and the discharge port of the washing kettle is connected with the rectifying tower. The utility model discloses can carry out more thorough recovery with the hydrogen sulfide gas body that produces, the sodium sulfide solution that produces simultaneously can effectual retrieval and utilization, improves the utilization ratio and the production efficiency of material.
Description
Technical Field
The utility model belongs to the technical field of N, N '-dicyclohexylcarbodiimide produces, concretely relates to N, N' -dicyclohexylcarbodiimide production system.
Background
N, N' -dicyclohexylcarbodiimide as a bifunctional crosslinking agentHas a chemical formula of C 13 H 22 N 2 It is a dehydrating agent commonly used in esterification, amidation and other reactions, and can also be used for synthesizing acid anhydride, aldehyde, ketone and isocyanate.
At present, the problems of low production efficiency, poor material utilization rate, low yield and the like exist in the production of N, N' -dicyclohexylcarbodiimide.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the defects in the prior art are overcome, and the N, N' -dicyclohexylcarbodiimide production system is provided, so that the utilization rate of materials can be improved, and the production efficiency is improved.
The utility model discloses an adopt following technical scheme to realize:
the N, N' -dicyclohexylcarbodiimide production system comprises a high-pressure reaction kettle, wherein the high-pressure reaction kettle is connected with a carbon disulfide dripping line, an exhaust port is formed in the upper part of the high-pressure reaction kettle and connected with an absorption device, the absorption device comprises multistage spray absorption towers connected in series, the bottom of each stage of spray absorption tower is connected with a corresponding spray pond, the spray ponds are connected with spray pipes, the spray pipes are connected with the upper parts of the spray absorption towers, an alkali liquor replenishing tank is sequentially connected with the spray ponds at each stage, the exhaust port is connected with a first stage of spray absorption tower through a pressurizing device, and the first stage of spray pond is connected with a recovery tank;
the discharge gate of high-pressure batch autoclave is connected with second reation kettle through the filter, it is connected with second reation kettle to retrieve the jar, and second reation kettle's discharge gate is connected with the washing cauldron, is connected with alkali lye washing line on the washing cauldron, and the discharge gate and the rectifying column of washing cauldron are connected.
Preferably, a pressurizing device is arranged between the multistage spray absorption towers.
Preferably, the top of the rectifying tower is respectively connected with a first condenser and a second condenser, the first condenser is connected with the second condenser, the first condenser and the second condenser are both connected with the rectifying tower, the first condenser and the second condenser are both connected with a vacuum buffer tank, the vacuum buffer tank is connected with a vacuum system, the first condenser and the second condenser are both connected with a cache tank, and the cache tank is connected with the vacuum buffer tank. The melting point of the N, N '-dicyclohexylcarbodiimide is very low and is 35-36 ℃, the N, N' -dicyclohexylcarbodiimide is easy to crystallize, and meanwhile, two groups of condensers which are connected in series and in parallel are arranged, so that the influence on production due to the failure of the condensers can be effectively avoided.
Compared with the prior art, the beneficial effects of the utility model are as follows:
the utility model discloses can carry out more thorough recovery with the hydrogen sulfide gas body that produces, the sodium sulfide solution that produces simultaneously can effectual retrieval and utilization, improves the utilization ratio and the production efficiency of material.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure: 1. a high-pressure reaction kettle; 2. a carbon disulfide dropping line; 3. an exhaust port; 4. a pressurizing device; 5. spraying an absorption tower; 6. a shower pipe; 7. a spray tank; 8. a recovery tank; 9. an alkali liquor replenishing tank; 10. a filter; 11. a second reaction kettle; 12. washing the kettle; 13. an alkaline washing line; 14. a rectifying tower; 15. a first condenser; 16. a second condenser; 17. a buffer tank; 18. a vacuum buffer tank; 19. a vacuum system.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the N, N' -dicyclohexylcarbodiimide production system comprises a high-pressure reaction kettle 1, wherein the high-pressure reaction kettle 1 is connected with a carbon disulfide dropping line 2, an exhaust port 3 is arranged at the upper part of the high-pressure reaction kettle 1, the exhaust port 3 is connected with an absorption device, the absorption device comprises three stages of spraying absorption towers 5 which are connected in series, the bottom of each stage of spraying absorption tower 5 is connected with a corresponding spraying pool 7, the spraying pool 7 is connected with a spraying pipe 6, the spraying pipe 6 is connected with the upper part of the spraying absorption tower 5, an alkali liquor replenishing tank 9 is sequentially connected with each stage of spraying pool 7, the exhaust port 3 is connected with a first stage of spraying absorption tower 5 through a pressurizing device 4, a pressurizing device 4 is arranged between the three stages of spraying absorption towers 5, and the first stage of spraying pool 7 is connected with a recovery tank 8;
the discharge gate of high pressure batch autoclave 1 is connected with second reation kettle 11 through filter 10, recovery jar 8 is connected with second reation kettle 11, and second reation kettle 11's discharge gate is connected with scrubbing kettle 12, is connected with alkali lye washing line 13 on the scrubbing kettle 12, and scrubbing kettle 12's discharge gate is connected with rectifying column 14.
The top of the rectifying tower 14 is respectively connected with a first condenser 15 and a second condenser 16, the first condenser 15 is connected with the second condenser 16, the first condenser 15 and the second condenser 16 are both connected with the rectifying tower 14, the first condenser 15 and the second condenser 16 are both connected with a vacuum buffer tank 18, the vacuum buffer tank 18 is connected with a vacuum system 19, the first condenser 15 and the second condenser 16 are both connected with a buffer tank 17, and the buffer tank 17 is connected with the vacuum buffer tank 18.
When the device works, water and cyclohexylamine are put into a high-pressure reaction kettle 1, then carbon disulfide is dripped through a carbon disulfide dripping line 2 to react, hydrogen sulfide gas generated in the reaction enters a three-stage spray absorption tower 5 through an exhaust port 3, a 30% sodium hydroxide solution in mass fraction is conveyed to each stage of spray tank 7 by an alkali liquor replenishing tank 9, then the sodium hydroxide solution is conveyed to a spray pipe 6 and introduced to the upper part of the spray absorption tower 5 to be sprayed, sodium hydroxide and the hydrogen sulfide gas react to generate sodium sulfide, and after absorption is finished, the sodium sulfide solution in each stage of spray tank 7 is conveyed into a recovery tank 8;
filtering the materials in the high-pressure reaction kettle 1 through a filter 10, conveying the materials into a second reaction kettle 11, adding sodium dodecyl benzene sulfonate and a sodium hypochlorite solution for reaction, adding a sodium sulfide solution in a recovery tank 8 into an organic phase in the second reaction kettle 11 after the materials are hot, conveying the organic phase after liquid separation into a washing kettle 12 after the reaction is finished, adding a sodium hydroxide solution into the washing kettle 12 from an alkali liquor washing line 13 for washing treatment, and conveying a crude product N, N '-dicyclohexylcarbodiimide into a rectifying tower 14 for rectification after the treatment is finished to obtain a finished product N, N' -dicyclohexylcarbodiimide.
Of course, the above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and the technical field of the present invention is equivalent to the changes and improvements made in the actual range of the present invention, which should be attributed to the patent coverage of the present invention.
Claims (3)
1. A N, N' -dicyclohexylcarbodiimide production system is characterized in that: the device comprises a high-pressure reaction kettle (1), wherein the high-pressure reaction kettle (1) is connected with a carbon disulfide dripping line (2), an exhaust port (3) is arranged at the upper part of the high-pressure reaction kettle (1), the exhaust port (3) is connected with an absorption device, the absorption device comprises a plurality of stages of spraying absorption towers (5) which are connected in series, the bottom of each stage of spraying absorption tower (5) is connected with a corresponding spraying pond (7), the spraying pond (7) is connected with a spraying pipe (6), the spraying pipe (6) is connected with the upper part of the spraying absorption tower (5), an alkali liquor replenishing tank (9) is sequentially connected with each stage of spraying pond (7), the exhaust port (3) is connected with a first stage of spraying absorption tower (5) through a pressurizing device (4), and the first stage of spraying pond (7) is connected with a recovery tank (8);
the discharge gate of high pressure batch autoclave (1) is connected with second reation kettle (11) through filter (10), retrieve jar (8) and be connected with second reation kettle (11), the discharge gate of second reation kettle (11) is connected with scrubbing kettle (12), is connected with alkali lye washing line (13) on scrubbing kettle (12), and the discharge gate of scrubbing kettle (12) is connected with rectifying column (14).
2. The N, N' -dicyclohexylcarbodiimide production system according to claim 1, characterized in that: a pressurizing device (4) is arranged between the multi-stage spraying absorption towers (5).
3. The N, N' -dicyclohexylcarbodiimide production system according to claim 1, characterized in that: rectifying column (14) top of the tower is connected with first condenser (15) and second condenser (16) respectively, first condenser (15) are connected with second condenser (16), first condenser (15) and second condenser (16) all are connected with rectifying column (14), first condenser (15) and second condenser (16) all are connected with vacuum buffer tank (18), vacuum buffer tank (18) are connected with vacuum system (19), first condenser (15) and second condenser (16) all are connected with buffer tank (17), buffer tank (17) are connected with vacuum buffer tank (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123368716.1U CN218372128U (en) | 2021-12-29 | 2021-12-29 | N, N' -dicyclohexylcarbodiimide production system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123368716.1U CN218372128U (en) | 2021-12-29 | 2021-12-29 | N, N' -dicyclohexylcarbodiimide production system |
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| CN218372128U true CN218372128U (en) | 2023-01-24 |
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| CN202123368716.1U Active CN218372128U (en) | 2021-12-29 | 2021-12-29 | N, N' -dicyclohexylcarbodiimide production system |
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