CN204661592U - A kind of EVOH continuous production system of high production - Google Patents
A kind of EVOH continuous production system of high production Download PDFInfo
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- CN204661592U CN204661592U CN201520233587.0U CN201520233587U CN204661592U CN 204661592 U CN204661592 U CN 204661592U CN 201520233587 U CN201520233587 U CN 201520233587U CN 204661592 U CN204661592 U CN 204661592U
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Abstract
The utility model relates to a kind of EVOH continuous production system of high production.It comprises feeding line (1), be connected with the reactor (3) of ethene admission line (2), and the intermediate storage tank (12) to be connected successively with reactor (3), stripping tower (4) and alcoholysis still (5), it is characterized in that: it also comprises the tempering tank (7) being connected with nitrogen inlet duct line (6), and condenser (13); Feeding line (1) is connected with tempering tank (7); Tempering tank (7) is connected with reactor (3); Tempering tank (7) is also connected with pipeline of giving vent to anger (8); Alcoholysis still (5) is connected with condenser (13), and forms circulation loop through reflux pipeline (14); Condenser (5) is also connected with by-product discharging pipeline (15).The utility model had both reduced the oxygen level in system, improve polymerization conversion and reaction efficiency, sufficiently lower again the content of polymer material in alcoholysis by-product acetic ester compounds.
Description
Technical field
The utility model relates to ethylene-vinyl alcohol copolymer, particularly relates to a kind of EVOH continuous production system of high production.
Background technology
Ethylene-vinyl alcohol copolymer (being called for short EVOH), be a kind of novel high polymer synthetic materials integrating the barrier properties for gases of polyvinyl processibility and vinyl alcohol polymer, be called three large high-barrier resins in the world with polyvinylidene dichloride (PVDC) and polyamide (PA).The 1950's, du pont company's first passage ethene and vinyl acetate (VAc) copolymerization, alcoholysis obtain EVOH resin.It generally can be polymerized obtained by resaponifying by ordinary methods such as letex polymerization, solution polymerization or suspension polymerizations by ethene and vinyl acetate.
At present, primary structure for the production of the system of EVOH is the reactor being simultaneously connected with the feeding lines such as Vinyl Acetate Monomer pipeline, solvent line, initiator pipeline and ethene admission line, be connected with stripping tower and alcoholysis still more successively, to realize the preparation of ethylene-vinyl alcohol copolymer.But the dissolved oxygen in reaction in monomer and solvent can be competed with Raolical polymerizable and consume free radical, and this has inhibition to reaction, causes the ethylene-vinyl alcohol resin obtained to occur the reactive species structures such as great amount of hydroxy group, carbonyl, peroxy the most at last.But in the production method of existing EVOH, do not realize the step of the oxygen level of material in effective reduction system, more do not have corresponding device to arrange; Meanwhile, in the alcoholysis process that EVOH produces, the alcoholysis system that it adopts mainly is connected with feeding line and discharging pipeline a relatively independent alcoholysis device respectively simultaneously; The polymer fluid containing ethylene-vinyl acetate copolymer passed into through feeding line adds from alcoholysis device top, and transesterification reaction and alcoholysis is carried out with the alcohol compound added in alcoholysis device, the gas phase produced or the direct extraction from alcoholysis device of liquid phase by-product acetic ester compounds, but find after testing: the polymer material still containing high level in the gas phase of direct extraction from alcoholysis device or liquid phase by-product acetic ester compounds, the i.e. operation of direct extraction, result in a small amount of polymer material and distillates from gas phase.This will reduce stability and the cycle of operation of the operation of upstream device, decreases the product yield of polymer material.
Utility model content
The purpose of this utility model is the EVOH continuous production system providing a kind of high production, the EVOH continuous production system of this high production both can oxygen level in fully reduction system, to improve polymerization conversion and reaction efficiency, the content of polymer material in the by-product acetic ester compounds of alcoholysis extraction fully can be reduced again.
The utility model object is achieved through the following technical solutions:
A kind of EVOH continuous production system of high production, it comprises feeding line, is connected with the reactor of ethene admission line, and the intermediate storage tank be connected successively with reactor, stripping tower and alcoholysis still, it is characterized in that: it also comprises the tempering tank being connected with nitrogen inlet duct line, and condenser; Described feeding line is connected with described tempering tank; Described tempering tank is connected with described reactor; Described tempering tank is also connected with pipeline of giving vent to anger; Described alcoholysis still is connected with described condenser, and the reflux pipeline through setting up forms a circulation loop; Described condenser is also connected with by-product discharging pipeline.
As further optimization, above-mentioned nitrogen inlet duct line end is arranged at below the liquid level in above-mentioned tempering tank.Above-mentioned nitrogen inlet duct line is also connected with aforesaid reaction vessel.Discharging the liquid starting material in tempering tank and the oxygen in reactor by passing into nitrogen, having reduced oxygen level wherein.
As further optimization, above-mentioned feeding line comprises Vinyl Acetate Monomer pipeline, solvent line and initiator pipeline.Arrange by this Vinyl Acetate Monomer, solvent and initiator added in tempering tank, then pass into nitrogen and carry out deoxygenation, reduce reaction just expect in oxygen level.
As further optimization, above-mentioned reflux pipeline is connected to the top of above-mentioned alcoholysis still.
Above-mentioned alcoholysis still, specifically can adopt belt-type alcoholysis still, autoclave alcoholysis still or tower alcoholysis still.
Also whipping appts is provided with in above-mentioned tempering tank and alcoholysis still.
The utility model has following beneficial effect:
The EVOH continuous production system of the high production in the utility model, fully stir and gas displacement by passing into nitrogen, sufficiently lower reaction in tempering tank just to expect and the oxygen level in reactor, reduce the oxygen level in production system, improve polymerization conversion and reaction efficiency, and in alcoholysis process, carry out feed back further, make partial polymer feed back to alcoholysis device, effectively reduce the polymer material in extraction acetic ester compounds, add the stability that equipment runs, also more effectively establish material balance.
Accompanying drawing explanation
The structural representation of the EVOH continuous production system that Fig. 1 is high production described in the utility model embodiment 1.
The structural representation of the EVOH continuous production system that Fig. 2 is high production described in the utility model embodiment 2.
Embodiment
Be below the utility model preferred embodiment, and be not intended to limit protection domain of the present utility model.
Embodiment 1
As shown in Figure 1: a kind of EVOH continuous production system of high production, it comprises Vinyl Acetate Monomer pipeline 9, solvent line 10 and initiator pipeline 11, be connected with the reactor 3 of ethene admission line 2, the intermediate storage tank 12 be connected successively with reactor 3, stripping tower 4 and alcoholysis still 5, be connected with the tempering tank 7 of nitrogen inlet duct line 6, and condenser 13; Its Vinyl Acetate Monomer pipeline 9, solvent line 10 are all connected with tempering tank 7 with initiator pipeline 11 simultaneously; Be provided with whipping appts in tempering tank 7, be also connected with pipeline 8 of giving vent to anger; This tempering tank 7 is connected with reactor 3; Wherein, nitrogen inlet duct line 6 end is arranged at below the liquid level in tempering tank 7, and this nitrogen inlet duct line 6 is also connected with reactor 3; Be provided with whipping appts in its alcoholysis still 5, be also connected with condenser 13, and the reflux pipeline 14 through setting up forms a circulation loop, and condenser 13 is also connected with by-product discharging pipeline 15.
During production practice application, Vinyl Acetate Monomer, solvent and initiator are added in tempering tank 7 and stir, pass into nitrogen while stirring and mix, replace, oxygen level in system is significantly reduced; Meanwhile, N is used
2to reactor more than 3 time displacement, discharge oxygen, further go out intrasystem oxygen; In addition, in alcoholysis process, alcoholysis still 5 is connected with condenser 13, and carry out feed back through reflux pipeline 14, make partial polymer feed back to alcoholysis still 5, effectively reduce the polymer material in extraction acetic ester compounds, add the stability that equipment runs, also more effectively establish material balance.
Embodiment 2
As shown in Figure 2: a kind of EVOH continuous production system of high production, it comprises feeding line 1, is connected with the reactor 3 of ethene admission line 2, the intermediate storage tank 12 be connected successively with reactor 3, stripping tower 4 and alcoholysis still 5, be connected with the tempering tank 7 of nitrogen inlet duct line 6, and condenser 13; Its feeding line 1 is connected with tempering tank 7; Be provided with whipping appts in tempering tank 7, be also connected with pipeline 8 of giving vent to anger; This tempering tank 7 is connected with reactor 3; Wherein, nitrogen inlet duct line 6 end is arranged at below the liquid level in tempering tank 7, and this nitrogen inlet duct line 6 is also connected with reactor 3; Its alcoholysis still 5 is connected with condenser 13, and the reflux pipeline 14 through setting up forms a circulation loop, and condenser 13 is also connected with by-product discharging pipeline 15.
Claims (9)
1. the EVOH continuous production system of a high production, it comprises feeding line (1), be connected with the reactor (3) of ethene admission line (2), and the intermediate storage tank (12) to be connected successively with reactor (3), stripping tower (4) and alcoholysis still (5), it is characterized in that: it also comprises the tempering tank (7) being connected with nitrogen inlet duct line (6), and condenser (13); Described feeding line (1) is connected with described tempering tank (7); Described tempering tank (7) is connected with described reactor (3); Described tempering tank (7) is also connected with pipeline of giving vent to anger (8); Described alcoholysis still (5) is connected with described condenser (13), and the reflux pipeline (14) through setting up forms a circulation loop; Described condenser (5) is also connected with by-product discharging pipeline (15).
2. the EVOH continuous production system of high production as claimed in claim 1, is characterized in that: described nitrogen inlet duct line (6) end is arranged at below the liquid level in described tempering tank (7); Described nitrogen inlet duct line (6) is also connected with described reactor (3).
3. the EVOH continuous production system of high production as claimed in claim 1 or 2, is characterized in that: described feeding line (1) comprises Vinyl Acetate Monomer pipeline (9), solvent line (10) and initiator pipeline (11).
4. the EVOH continuous production system of high production as claimed in claim 1 or 2, is characterized in that: described reflux pipeline (14) is connected to the top of described alcoholysis still (5).
5. the EVOH continuous production system of high production as claimed in claim 3, is characterized in that: described reflux pipeline (14) is connected to the top of described alcoholysis still (5).
6. the EVOH continuous production system of high production as claimed in claim 1 or 2, is characterized in that: described alcoholysis still (5) adopts belt-type alcoholysis still, autoclave alcoholysis still or tower alcoholysis still; Also whipping appts is provided with in described tempering tank (7) and described alcoholysis still (5).
7. the EVOH continuous production system of high production as claimed in claim 3, is characterized in that: described alcoholysis still (5) adopts belt-type alcoholysis still, autoclave alcoholysis still or tower alcoholysis still; Also whipping appts is provided with in described tempering tank (7) and described alcoholysis still (5).
8. the EVOH continuous production system of high production as claimed in claim 4, is characterized in that: described alcoholysis still (5) adopts belt-type alcoholysis still, autoclave alcoholysis still or tower alcoholysis still; Also whipping appts is provided with in described tempering tank (7) and described alcoholysis still (5).
9. the EVOH continuous production system of high production as claimed in claim 5, is characterized in that: described alcoholysis still (5) adopts belt-type alcoholysis still, autoclave alcoholysis still or tower alcoholysis still; Also whipping appts is provided with in described tempering tank (7) and described alcoholysis still (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520233587.0U CN204661592U (en) | 2015-04-17 | 2015-04-17 | A kind of EVOH continuous production system of high production |
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| CN201520233587.0U CN204661592U (en) | 2015-04-17 | 2015-04-17 | A kind of EVOH continuous production system of high production |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114426612A (en) * | 2020-10-14 | 2022-05-03 | 中国石油化工股份有限公司 | Ethylene-vinyl alcohol copolymer production device |
| CN115894769B (en) * | 2022-11-29 | 2024-05-17 | 清华大学 | Process for preparing ethylene-vinyl alcohol copolymer |
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2015
- 2015-04-17 CN CN201520233587.0U patent/CN204661592U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114426612A (en) * | 2020-10-14 | 2022-05-03 | 中国石油化工股份有限公司 | Ethylene-vinyl alcohol copolymer production device |
| CN115894769B (en) * | 2022-11-29 | 2024-05-17 | 清华大学 | Process for preparing ethylene-vinyl alcohol copolymer |
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