CN202346931U - Million-ton grade industrial production system for separating 65/35-DNT (dinitrotoluene) through rectifying method to obtain 80/20-DNT and 2, 6-DNT - Google Patents
Million-ton grade industrial production system for separating 65/35-DNT (dinitrotoluene) through rectifying method to obtain 80/20-DNT and 2, 6-DNT Download PDFInfo
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- CN202346931U CN202346931U CN2011204013746U CN201120401374U CN202346931U CN 202346931 U CN202346931 U CN 202346931U CN 2011204013746 U CN2011204013746 U CN 2011204013746U CN 201120401374 U CN201120401374 U CN 201120401374U CN 202346931 U CN202346931 U CN 202346931U
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Abstract
The utility model discloses a million-ton grade industrial production system for separating 65/35-DNT (dinitrotoluene) through a rectifying method to obtain 80/20-DNT and 2, 6-DNT. The production system comprises a separator, a dryer, a raw material tank, a head tank, a feed preheater, a rectifying tower, an 2, 6-DNT receiving trough, an 80/20-DNT receiving trough and a light fraction receiving trough, wherein the separator is connected with the head tank through the dryer, the head tank is behind and above the raw material tank, the feeding hole of the feed preheater is connected with the discharge hole of the head tank while the discharge hole of the feed preheater is connected with the feeding hole of the rectifying tower; the rectifying tower comprises a tower body, a tower bottom, a reboiler and an overhead condenser; the top of the tower body is connected with the light fraction receiving trough through a light fraction condenser; the upper part of the tower body is internally provided with a liquid receiving tray, the 2, 6-DNT receiving trough is connected with the liquid receiving tray; and the bottom of the tower bottom is connected with a circulating pump, and the discharge hole of the circulating pump is connected with the reboiler and the 80/20-DNT receiving trough. By adopting the million-ton grade industrial production system, the problem of high-temperature pyrolysis and explosion of DNT and the problem of large-scale industrial production and application can be effectively solved.
Description
Technical field
The utility model relates to a kind of production system of utilizing rectification method to separate 65/35-DNT, relates in particular to a kind of rectification method separation 65/35-DNT that utilizes and gets 80/20-DNT and 2, the ton suitability for industrialized production system of 6-DNT.
Background technology
Up to now, separate the main method of DNT (DNT) isomer: the molecular sieve property selected suction symbol method, crystallization process and rectification method, division is following: (1) molecular sieve property selected absorption method: this method expense is higher, and economic worth is not high; (2) crystallization process: no matter be crystallization or the recrystallization that adopts organic solvent or inorganic solvent to carry out, all can not from industrial DNT, isolate pure 2,6-DNT, and cost is than higher; (3) rectification method.
The device that existing rectification method is adopted is that University Of Tianjin produces hundred tonnes rectifying pilot plant per year; Its technical process is narrated as follows: 65/35-DNT at first gets into drying tower; Under vacuum state, distill with steam heating; Light fraction water send wastewater treatment from the cat head extraction, and dry qualified 65/35-DNT gets into decoking tower feed chute from the extraction of drying tower still; The 65/35-DNT of decoking tower feed chute squeezes into the decoking tower through decoking tower fresh feed pump, and with the steam heating distillation, the tower residue tar is made burning disposal under vacuum state, and cat head 65/35-DNT gets into the rectifying tower feed chute; The 65/35-DNT of rectifying tower feed chute gets to rectifying charging header tank with pump, gets into rectifying tower, and with the steam heating distillation, cat head separates extraction 2 under vacuum state, 6-DNT, and the tower still separates extraction 80/20-DNT.But this method output is limited, is not enough to satisfy need of industrial production, and simultaneously, DNT high temperature (the thermolysis temperature of explosion of DNT is 300 ℃) thermolysis down explodes easily.
Summary of the invention
The purpose of the utility model just is to provide a kind of rectification method separation 65/35-DNT that utilizes to get 80/20-DNT and 2, and the ton suitability for industrialized production system of 6-DNT can effectively solve the problem and the large-scale industrial production application problem of thermolysis blast under the DNT high temperature.
To achieve these goals; The technical scheme that the utility model adopts is such: a kind of rectification method separation 65/35-DNT that utilizes gets 80/20-DNT and 2; The ton suitability for industrialized production system of 6-DNT; Comprise separator, moisture eliminator, head tank, header tank, feed preheater, rectifying tower, 2,6-DNT Receiving bin, 80/20-DNT Receiving bin and light fraction Receiving bin;
Said separator has an opening for feed, water port and discharge port, and the discharge port of separator links to each other with the header tank of head tank top behind moisture eliminator and head tank through pipeline, on the pipeline between head tank and the header tank, is provided with a take away pump; Said feed preheater is positioned at the header tank below, and its opening for feed links to each other with the discharge port of header tank through pipeline, and simultaneously, the discharge port of feed preheater links to each other with the opening for feed of rectifying tower;
Said rectifying tower comprises tower body, tower still, reboiler and overhead condenser;
The tower body top links to each other with the light fraction Receiving bin behind the light fraction condensing surface through pipeline;
Also be built-in with liquid dish on tower body top, this liquid dish is positioned at overhead condenser below, and is said 2, and the 6-DNT Receiving bin links to each other with liquid dish;
Said tower still is positioned at the bottom of tower body, and the bottom of tower still links to each other with a recycle pump through pipeline, and the opening for feed of said recycle pump links to each other with the tower still, and discharge port links to each other with the 80/20-DNT Receiving bin with reboiler simultaneously;
The opening for feed of said reboiler links to each other with recycle pump, and discharge port links to each other with tower still top.
Further, the light fraction Receiving bin also is connected with water ring vacuum pump and two-stage Roots vaccum pump successively.The vacuum tightness that makes production system is reduced to-0.0994MPa by-0.090MPa, and the boiling point (top temperature) that makes DNT in the rectifying tower is reduced to 190 ℃ from 230 ℃, guarantees the essential safety operation of device.
Compared with prior art, the advantage of the utility model is:
1. cancelled drying tower, it is dry to press empty drying to substitute the rectifying tower with indirect steam heating and drum, has cancelled the decoking tower, makes whole process flow shorten to the rectifying separation technical process of a tower; After the technological process of production shortened, production cost reduced, and investment cost reduces, and DNT shortened in the residence time of high temperature production system, reduces the pyrolysated probability takes place;
2. rectifying tower adopts water ring vacuum pump series connection two-stage Roots vaccum pump place of water squirt pump to vacuumize; The vacuum tightness that makes production system is reduced to-0.0994MPa by-0.090MPa; The boiling point (top temperature) that makes DNT in the rectifying tower is reduced to 190 ℃ from 230 ℃, guarantees the essential safety operation of device;
3. solved the outlet of the isolated Ortho Nitro Toluene of DNT separation of produced line;
4. industrial scale is amplified to 10000 tons/year from 100 tons of/year pilot scale production equipments.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Embodiment
To combine accompanying drawing that the utility model is described further below.
Embodiment: referring to Fig. 1; A kind of rectification method separation 65/35-DNT that utilizes gets 80/20-DNT and 2; The ton suitability for industrialized production system of 6-DNT; Comprise separator 1, moisture eliminator 2, head tank 3, header tank 4, feeding preheating, 6, rectifying tower 7,2,6-DNT Receiving bin 9,80/20-DNT Receiving bin 10 and light fraction Receiving bin 11; This light fraction Receiving bin also is connected with water ring vacuum pump 13 and two-stage Roots vaccum pump 14 successively; The vacuum tightness that makes production system is reduced to-0.0994MPa by-0.090MPa; The boiling point (top temperature) that makes DNT in the rectifying tower 7 is reduced to 190 ℃ from 230 ℃, guarantees the essential safety operation of device.
Said separator 1 has an opening for feed, water port and discharge port, and the discharge port of separator 1 links to each other with the header tank 4 of head tank 3 tops behind moisture eliminator 2 and head tank 3 through pipeline, on the pipeline between head tank 3 and the header tank 4, is provided with a take away pump 5; Said feed preheater 6 is positioned at header tank 4 belows, and its opening for feed links to each other with the discharge port of header tank 4 through pipeline, and simultaneously, the discharge port of feed preheater 6 links to each other with the opening for feed of rectifying tower 7
Said rectifying tower 7 comprises tower body 71, tower still 72, reboiler 73 and overhead condenser 74; The tower body top links to each other with light fraction Receiving bin 11 behind light fraction condensing surface 8 through pipeline; Also be built-in with liquid dish 75 on tower body 71 tops, this liquid dish 75 is positioned at overhead condenser 74 belows, and is said 2, and 6-DNT Receiving bin 9 links to each other with liquid dish 75; Said tower still 72 is positioned at the bottom of tower body 71, and the bottom of tower still 72 links to each other with a recycle pump 12 through pipeline, and the opening for feed of said recycle pump 12 links to each other with tower still 72, and discharge port links to each other with 80/20-DNT Receiving bin 10 with reboiler 73 simultaneously.
The opening for feed of said reboiler 73 links to each other with recycle pump 12, and discharge port links to each other with tower still 72 tops; It is that full tower provides heat that material is got into the 72 participation rectifying of tower still by reboiler 73 heating vaporization backs.
Utilize the isolating 80/20-DNT of the utility model 65/35-DNT and 2, the 6-DNT process is following: the 65/35-DNT that the Ortho Nitro Toluene two stage nitration is obtained gets in the separator, makes the waste water part in the material separated, discharges; And then moisture eliminator; In moisture eliminator, be heated to 120 ℃ and feed the pressurized air bubble drying simultaneously; Qualified back gets into head tank; Send into header tank with take away pump again, and then after feed preheater is heated to 1140 ℃, get into the rectifying tower tower body, in the filler of tower body, constantly carry out the heat and mass exchange: heavy fraction gets into the tower still and is recycled the pump pump circulation; To the 80/20-DNT Receiving bin, another part entering reboiler is heated vaporization and gets into tower still participation rectifying more qualified part 80/20-DNT from the circulating-pump outlet extraction; Light fraction and 2,6-DNT steam get into tower body top, and 2,6-DNT steam is got into tower body top liquid dish by the overhead condenser condensation, and is qualified 2,6-DNT extraction to 2,6-DNT Receiving bin, another part are back to tower body and continue to participate in rectifying; Light fraction gets into the light fraction Receiving bin after the light fraction condenser condenses.
The advantage of the utility model is:
1. cancelled drying tower, it is dry to press empty drying to substitute the rectifying tower with indirect steam heating and drum, has cancelled the decoking tower, makes whole process flow shorten to the rectifying separation technical process of a tower; After the technological process of production shortened, production cost reduced, and investment cost reduces, and DNT shortened in the residence time of high temperature production system, reduces the pyrolysated probability takes place;
2. rectifying tower adopts water ring vacuum pump series connection two-stage Roots vaccum pump place of water squirt pump to vacuumize; The vacuum tightness that makes production system is reduced to-0.0994MPa by-0.090MPa; The boiling point (top temperature) that makes DNT in the rectifying tower is reduced to 190 ℃ from 230 ℃, guarantees the essential safety operation of device;
3. solved the outlet of the isolated Ortho Nitro Toluene of DNT separation of produced line;
4. industrial scale is amplified to 10000 tons/year from 100 tons of/year pilot scale production equipments.
Claims (2)
1. one kind is utilized rectification method separation 65/35-DNT to get 80/20-DNT and 2; The ton suitability for industrialized production system of 6-DNT; It is characterized in that: comprise separator, moisture eliminator, head tank, header tank, feed preheater, rectifying tower, 2,6-DNT Receiving bin, 80/20-DNT Receiving bin and light fraction Receiving bin;
Said separator has an opening for feed, water port and discharge port, and the discharge port of separator links to each other with the header tank of head tank top behind moisture eliminator and head tank through pipeline, on the pipeline between head tank and the header tank, is provided with a take away pump; Said feed preheater is positioned at the header tank below, and its opening for feed links to each other with the discharge port of header tank through pipeline, and simultaneously, the discharge port of feed preheater links to each other with the opening for feed of rectifying tower;
Said rectifying tower comprises tower body, tower still, reboiler and overhead condenser;
The tower body top links to each other with the light fraction Receiving bin behind the light fraction condensing surface through pipeline;
Also be built-in with liquid dish on tower body top, this liquid dish is positioned at overhead condenser below, and is said 2, and the 6-DNT Receiving bin links to each other with liquid dish;
Said tower still is positioned at the bottom of tower body, and the bottom of tower still links to each other with a recycle pump through pipeline, and the opening for feed of said recycle pump links to each other with the tower still, and discharge port links to each other with the 80/20-DNT Receiving bin with reboiler simultaneously;
The opening for feed of said reboiler links to each other with recycle pump, and discharge port links to each other with tower still top.
2. a kind of rectification method separation 65/35-DNT that utilizes according to claim 1 gets 80/20-DNT and 2, and the ton suitability for industrialized production system of 6-DNT is characterized in that: the light fraction Receiving bin also is connected with water ring vacuum pump and two-stage Roots vaccum pump successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204013746U CN202346931U (en) | 2011-10-20 | 2011-10-20 | Million-ton grade industrial production system for separating 65/35-DNT (dinitrotoluene) through rectifying method to obtain 80/20-DNT and 2, 6-DNT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204013746U CN202346931U (en) | 2011-10-20 | 2011-10-20 | Million-ton grade industrial production system for separating 65/35-DNT (dinitrotoluene) through rectifying method to obtain 80/20-DNT and 2, 6-DNT |
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| Publication Number | Publication Date |
|---|---|
| CN202346931U true CN202346931U (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011204013746U Expired - Fee Related CN202346931U (en) | 2011-10-20 | 2011-10-20 | Million-ton grade industrial production system for separating 65/35-DNT (dinitrotoluene) through rectifying method to obtain 80/20-DNT and 2, 6-DNT |
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| CN (1) | CN202346931U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104251600A (en) * | 2013-06-26 | 2014-12-31 | 航天长征化学工程股份有限公司 | Liquid nitrogen washing device |
| CN104930350A (en) * | 2015-05-11 | 2015-09-23 | 湖北东方化工有限公司 | Paranitrotoluene conveying device and device for preparing trinitrotoluene through nitrification of paranitrotoluene |
-
2011
- 2011-10-20 CN CN2011204013746U patent/CN202346931U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104251600A (en) * | 2013-06-26 | 2014-12-31 | 航天长征化学工程股份有限公司 | Liquid nitrogen washing device |
| CN104930350A (en) * | 2015-05-11 | 2015-09-23 | 湖北东方化工有限公司 | Paranitrotoluene conveying device and device for preparing trinitrotoluene through nitrification of paranitrotoluene |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120725 Termination date: 20151020 |
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| EXPY | Termination of patent right or utility model |