CN104892511A - System for improving recovery quality of caprolactam monomer - Google Patents
System for improving recovery quality of caprolactam monomer Download PDFInfo
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- CN104892511A CN104892511A CN201410506079.5A CN201410506079A CN104892511A CN 104892511 A CN104892511 A CN 104892511A CN 201410506079 A CN201410506079 A CN 201410506079A CN 104892511 A CN104892511 A CN 104892511A
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- cracking
- condenser
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- caprolactam monomer
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Abstract
The invention discloses a system for improving the recovery quality of a caprolactam monomer. The system comprises a cracking kettle, a cracking condenser, preheaters, a heater and a biphenyl evaporator. A mixed material sequentially passes the preheaters and the heater and reaches the cracking kettle to perform cracking; after the mixed material cracks, a gaseous monomer is conveyed to the cracking condenser through a pipeline at the top of the cracking kettle and is condensed in the cracking condenser, and a liquid material is discharged from the bottom of the cracking kettle through a material discharging pump; the biphenyl evaporator is in pipe connection with the heater. The system for improving the recovery quality of the caprolactam monomer can achieve improvement on the quality of an intermediate of a monomer recovery system, reduces the content of a cylic oligomer, improves the product quality, reduces the production cost and improves the quality of slicings.
Description
Technical field
The present invention is specifically related to a kind of system improving caprolactam monomer recovery quality.
Background technology
Caprolactam polymerization is a balanced reaction, after final polyreaction terminates, have in material about about 10% be oligopolymer or monomer, in order to cost-saving, to re-use after these MONOMER RECOVERY, again squeeze into paradigmatic system again with the mixing of fresh hexanolactam.
Because have cyclic polymer in oligopolymer, be cyclic dimer, cyclic trimer mostly, these cyclic polymers cannot be opened segment and again participate in polyreaction under current processing condition, and the existence of these oligopolymer can affect the quality of section.Therefore, need the segment of oligopolymer to open, decompose, make it again to participate in polyreaction.
In order to the segment opening these oligopolymer has introduced cracking still, under elevated pressure conditions, the segment of these oligopolymer is opened the polymerization be then convenient to below, improve product quality.
Summary of the invention
For solving the problems of the technologies described above, the present invention proposes a kind of system improving caprolactam monomer recovery quality, oligopolymer can be cracked into monomer by this system, improves polymerization product quality.
For achieving the above object, technical scheme of the present invention is as follows:
Improve the system that caprolactam monomer reclaims quality, comprise cracking still, cracking condenser, preheater, well heater and biphenyl vaporizer;
Mixture arrives cracking in cracking still through preheater and well heater successively, the gaseous monomer after cracking from the Cemented filling at cracking still top to cracking condenser condensation; Liquid material after cracking exports through discharging pump bottom cracking still;
Described biphenyl vaporizer is connected with described heater conduit.
Preferably, described well heater is provided with coupled gas-liquid separator one.
Preferably, the still air outlet pipeline with it of described cracking still is connected with gas-liquid separator two, and described cracking still bottom discharge mouth is connected with gas-liquid separator three.
Preferably, described cracking condenser is equipped with water-sealed tank.
Preferably, described preheater is provided with heat medium circulation pump.
The present invention's advantage is compared with prior art:
Improve the quality of Monomer Recovery System intermediate, reduce wherein cyclic oligomer levels, improve quality product, reduce production cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below.
Fig. 1 is a kind of structural representation improving the system of caprolactam monomer recovery quality disclosed in the embodiment of the present invention 1.
1. cracking still 2. cracking condenser 3. preheater 4. well heater 5. biphenyl vaporizer 6. discharging pump 7. gas-liquid separator 1 gas-liquid separator 2 9. gas-liquid separator 3 10. water-sealed tank 11. heat medium circulation pump
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.
Embodiment 1.
As shown in Figure 1, a kind of system improving caprolactam monomer recovery quality, comprises cracking still 1, cracking condenser 2, preheater 3, well heater 4 and biphenyl vaporizer 5;
Mixture arrives cracking in cracking still 1 through preheater 3 and well heater 4 successively, the gaseous monomer after cracking from the Cemented filling at cracking still top to cracking condenser 2 condensation; Liquid material after cracking exports through discharging pump 6 bottom cracking still; Described biphenyl vaporizer 5 is connected with described well heater 4 pipeline.
Because the hexanolactam of fresh hexanolactam and recovery is first mixed together then to enter cracking still by we, thus bottom cracking still out be exactly the hexanolactam of melting.
Described well heater 4 is provided with coupled gas-liquid separator 1, and the still air outlet pipeline with it of described cracking still is connected with gas-liquid separator 28, and described cracking still bottom discharge mouth is connected with gas-liquid separator 39.Material injected system can be mixed with air, and the effect of gas-liquid separator three is exactly discharged by air.In addition because heating medium temperature is so high, heating medium has inside circulated for a long time and has had waste gas unavoidably, also needs to discharge.
Described cracking condenser is equipped with water-sealed tank 10.
Described preheater is provided with heat medium circulation pump 11.
The present invention's advantage is compared with prior art:
Improve the quality of Monomer Recovery System intermediate, reduce wherein cyclic oligomer levels, improve quality product, reduce production cost.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. improve the system that caprolactam monomer reclaims quality, it is characterized in that, comprise cracking still, cracking condenser, preheater, well heater and biphenyl vaporizer;
Mixture arrives cracking in cracking still through preheater and well heater successively, the gaseous monomer after cracking from the Cemented filling at cracking still top to cracking condenser condensation; Liquid material after cracking exports through discharging pump bottom cracking still;
Described biphenyl vaporizer is connected with described heater conduit.
2. a kind of system improving caprolactam monomer recovery quality according to claim 1, it is characterized in that, described well heater is provided with coupled gas-liquid separator one.
3. a kind of system improving caprolactam monomer recovery quality according to claim 1 and 2, it is characterized in that, the still air outlet pipeline with it of described cracking still is connected with gas-liquid separator two, and described cracking still bottom discharge mouth is connected with gas-liquid separator three.
4. a kind of system improving caprolactam monomer recovery quality according to claim 3, it is characterized in that, described cracking condenser is equipped with water-sealed tank.
5. a kind of system improving caprolactam monomer recovery quality according to claim 4, it is characterized in that, described preheater is provided with heat medium circulation pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410506079.5A CN104892511A (en) | 2014-09-26 | 2014-09-26 | System for improving recovery quality of caprolactam monomer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410506079.5A CN104892511A (en) | 2014-09-26 | 2014-09-26 | System for improving recovery quality of caprolactam monomer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104892511A true CN104892511A (en) | 2015-09-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410506079.5A Pending CN104892511A (en) | 2014-09-26 | 2014-09-26 | System for improving recovery quality of caprolactam monomer |
Country Status (1)
| Country | Link |
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| CN (1) | CN104892511A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107051345A (en) * | 2017-01-25 | 2017-08-18 | 江苏永通新材料科技有限公司 | A kind of oligomer separator for being used to produce polyamide section |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3925365A (en) * | 1974-02-11 | 1975-12-09 | Kanebo Ltd | Method for isolating epsilon-caprolactam material |
| EP0670307A2 (en) * | 1994-03-04 | 1995-09-06 | Basf Corporation | Process for the purification of crude caprolactam |
| WO1997006137A1 (en) * | 1995-08-10 | 1997-02-20 | Alliedsignal Inc. | Recovery of caprolactam from nylon-6 scrap |
| CN1169718A (en) * | 1994-12-12 | 1998-01-07 | 巴斯福股份公司 | Method of obtaining caprolactam by cracking of molten polycaprolactam |
| CN203763871U (en) * | 2014-03-10 | 2014-08-13 | 浙江美邦实业集团有限公司 | Novel concentrated solution tank for caprolactam recovery |
-
2014
- 2014-09-26 CN CN201410506079.5A patent/CN104892511A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3925365A (en) * | 1974-02-11 | 1975-12-09 | Kanebo Ltd | Method for isolating epsilon-caprolactam material |
| EP0670307A2 (en) * | 1994-03-04 | 1995-09-06 | Basf Corporation | Process for the purification of crude caprolactam |
| CN1169718A (en) * | 1994-12-12 | 1998-01-07 | 巴斯福股份公司 | Method of obtaining caprolactam by cracking of molten polycaprolactam |
| WO1997006137A1 (en) * | 1995-08-10 | 1997-02-20 | Alliedsignal Inc. | Recovery of caprolactam from nylon-6 scrap |
| CN203763871U (en) * | 2014-03-10 | 2014-08-13 | 浙江美邦实业集团有限公司 | Novel concentrated solution tank for caprolactam recovery |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107051345A (en) * | 2017-01-25 | 2017-08-18 | 江苏永通新材料科技有限公司 | A kind of oligomer separator for being used to produce polyamide section |
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Application publication date: 20150909 |
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| WD01 | Invention patent application deemed withdrawn after publication |