CN1074433A - The novel process of separation of high-concentration divinylbenzene - Google Patents
The novel process of separation of high-concentration divinylbenzene Download PDFInfo
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- CN1074433A CN1074433A CN 92114191 CN92114191A CN1074433A CN 1074433 A CN1074433 A CN 1074433A CN 92114191 CN92114191 CN 92114191 CN 92114191 A CN92114191 A CN 92114191A CN 1074433 A CN1074433 A CN 1074433A
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- tower
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- divinylbenzene
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Abstract
The present invention relates to separation of high-concentration divinylbenzene technology novel method.This processing method is compared with traditional separating technology, it is characterized in that being provided with two independent still formulas series connection decompression topping still systems and replaced a topping still in the former technology, and in two topping stills, be filled with screen waviness packings, also carried out the methodology that at the bottom of topping still cat head, tower, adds stopper simultaneously simultaneously.Because the present invention has the effect that reduces the still temperature, and product content is reached more than 50%, operation is reliable, remarkable in economical benefits.
Description
The invention belongs to the separation method of divinylbenzene.
Divinylbenzene is a main industrial chemicals of producing various resins.Product is divided into Three Estate by contained divinylbenzene amount (weight percentage): first grade content 〉=50%, seconds content 〉=40%, three grade product content 〉=35%.Domestic production producer, product can only reach seconds at present, and required first grade is entirely by import.
Divinylbenzene is that the by product diethylbenzene mixture of isomers with producing phenylethane from alkylation of benzene is a raw material, dehydrogenation generates divinylbenzene under the effect of Fe-series catalyst, in the dehydrogenation liquid except the principal product divinylbenzene, EST, and unreacted diethylbenzene in addition and a spot of benzene,toluene,xylene, ethylbenzene, vinylbenzene, Vinyl toluene etc.This dehydrogenation liquid through the still-process of topping still, low boil tower, rectifying tower, obtains product by the rectifying tower cat head more at last, and its technical process as shown in Figure 1.Wherein 1 is dehydrogenation furnace, and 2 is topping still, and 3 are the low tower that boils, and 4 is rectifying tower.In this production process, the distillation tower that is adopted, what have is tray column, and what have is the granular filler tower, is guaranteeing have under the prerequisite of enough separation theorem plates, the service temperature of tower is too high, the column bottom temperature of topping still is generally more than 105 ℃, because divinylbenzene belongs to easy polymkeric substance, therefore in sepn process, stifled tower takes place in the polymerization that usually causes divinylbenzene owing to temperature in the topping still tower is too high, causes production to carry out.In order to reduce stifled tower phenomenon, add the stopper measure although taked in the production at the opening for feed place of tower, but because the domestic inhibitor heat resistance is poor, so stifled tower phenomenon still takes place again and again, for keeping ordinary production, can only reduce the purity of product, the content of divinylbenzene is about 42%, and product is in the level of seconds always.External this identical product of producing, its gordian technique has been to adopt special stopper, and this stopper production technology is very secret.Therefore, we must be based on using homemade existing stopper, realize producing one-level qualified product purpose, and its gordian technique is to change existing traditional separating process so.
The object of the present invention is to provide a kind of new process of divinylbenzene of separation of high-concentration, this processing method can make the content (weight percentage) of divinylbenzene reach more than 50%.
Realize purpose of the present invention, its gordian technique is to have adopted two independent still formulas series connection decompression topping still systems to replace a topping still in the former technology, and in two topping stills, adopt the screen waviness packings of high-level efficiency low pressure drop to replace column plate audaciously, meanwhile, cat head at first topping still, be respectively equipped with the inlet that adds of stopper at the bottom of the tower, carry out the methodology that at the bottom of cat head, tower, adds stopper simultaneously.
Accompanying drawing 2 is process flow diagrams of the present invention.Wherein 5 is dehydrogenation furnace, and 6 are decompression topping still I, filling screen waviness packings in the tower, and 7 for decompression topping still II, also loads screen waviness packings in the tower, and this two tower is provided with tower still and overhead condenser separately, and 8 are the low tower that boils, and 9 is rectifying tower.
2 couples of the present invention are specifically described in conjunction with the accompanying drawings: after the diethylbenzene isomer mixture that is transported by preceding operation enters dehydrogenation furnace 5, under the Fe-series catalyst effect, carry out dehydrogenation reaction in high temperature more than 600 ℃ and generate divinylbenzene, in this dehydrogenation liquid except that the principal product divinylbenzene, by products such as vinyl xylene, ethyl vinyl benzene, and unreacted diethylbenzene in addition and a spot of benzene,toluene,xylene, ethylbenzene, vinylbenzene, Vinyl toluene, first and second benzene, naphthalene.The dehydrogenation liquid that contains above-mentioned all multicomponents at first enters decompression topping still I after leaving dehydrogenation furnace, through still-process, overhead product goes the low tower that boils further to distill, bottom product is as the charging of decompression topping still II, and the overhead product of decompression topping still II is back to the bottom of decompression topping still I, and its bottom product goes rectifying tower 9 to separate again.In two independent still formulas series connection decompression topping still systems, top backflow place of tower I and bottom feed place are equipped with the inlet that adds of stopper, carry out stopper and advance the tower methodology simultaneously at the bottom of cat head, tower with phegma and feeding liquid respectively.The overhead product of decompression topping still I enters the low tower 8 that boils after distillation, and the low-boiling-point substance of this cat head output is as solvent or fuel, and the product at the bottom of its tower is back to dehydrogenation furnace.The bottom product of decompression topping still II is to contain mixtures such as divinylbenzene more than 50% and EST, naphthalene, tar.This mixed solution is delivered to rectifying tower 9 and is further distilled, and can obtain to contain high density divinylbenzene product more than 50%, output naphthalene, tar at the bottom of its tower at its cat head.
The present invention compares with existing divinylbenzene separation process scheme, on apparatus, established a decompression topping still system more, still, because the present invention has reduced the operating temperature (still temperature≤85 ℃) of topping still effectively, reduced significantly the autohemagglutination of divinylbenzene, this is not only effective Guaranteed the continuity of production process, also greatly improved simultaneously the quality of product, make product reach primes. Therefore, the present invention has products of separated quality height, and operation is reliable, the characteristics of remarkable in economical benefits.
Manufacturer facts have proved according to East China, and divinylbenzene concentration can be stabilized in 56-58%, and product quality has reached the imported from America level, and production operation is stable normal, and economic benefit can reach 3,000,000 yuan of years, and product does not need reimportation.
Claims (1)
1, by product diethylbenzene isomer mixture with producing phenylethane from alkylation of benzene is a raw material, under the Fe-series catalyst effect, generate the mixed solution that contains divinylbenzene through the high-temperature dehydrogenation reaction, and then through topping still, the low tower that boils, the fractionation by distillation of rectifying tower, realize the novel process of separation of high-concentration divinylbenzene, it is characterized in that: in this technology, be provided with two independent still formulas series connection decompression topping still systems, and in two topping stills filling screen waviness packings and at the bottom of the cat head of topping still I and tower, be respectively equipped with the inlet that adds of stopper, carry out the same respectively phegma of stopper, feeding liquid is simultaneously from cat head at the bottom of the tower, advance the methodology of tower at the bottom of the tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92114191 CN1074433A (en) | 1992-12-07 | 1992-12-07 | The novel process of separation of high-concentration divinylbenzene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92114191 CN1074433A (en) | 1992-12-07 | 1992-12-07 | The novel process of separation of high-concentration divinylbenzene |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1074433A true CN1074433A (en) | 1993-07-21 |
Family
ID=4946825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92114191 Pending CN1074433A (en) | 1992-12-07 | 1992-12-07 | The novel process of separation of high-concentration divinylbenzene |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1074433A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074008C (en) * | 1997-08-13 | 2001-10-31 | 山东东大化学工业(集团)公司 | Diethenyl benzene used for ion exchange resin |
| CN112209795A (en) * | 2019-07-12 | 2021-01-12 | 中国石油化工股份有限公司 | Production method of divinylbenzene for ion exchange resin |
-
1992
- 1992-12-07 CN CN 92114191 patent/CN1074433A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074008C (en) * | 1997-08-13 | 2001-10-31 | 山东东大化学工业(集团)公司 | Diethenyl benzene used for ion exchange resin |
| CN112209795A (en) * | 2019-07-12 | 2021-01-12 | 中国石油化工股份有限公司 | Production method of divinylbenzene for ion exchange resin |
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| PB01 | Publication | ||
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |