CN103084043B - A kind of efficient spraying solvent recovering system and technique thereof - Google Patents
A kind of efficient spraying solvent recovering system and technique thereof Download PDFInfo
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- CN103084043B CN103084043B CN201110343266.2A CN201110343266A CN103084043B CN 103084043 B CN103084043 B CN 103084043B CN 201110343266 A CN201110343266 A CN 201110343266A CN 103084043 B CN103084043 B CN 103084043B
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- 239000002904 solvent Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005507 spraying Methods 0.000 title claims abstract description 19
- 238000010521 absorption reaction Methods 0.000 claims abstract description 77
- 239000007788 liquid Substances 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 79
- 239000007921 spray Substances 0.000 claims description 20
- 125000004122 cyclic group Chemical group 0.000 claims description 19
- 239000007864 aqueous solution Substances 0.000 claims description 9
- 230000002745 absorbent Effects 0.000 claims description 8
- 239000002250 absorbent Substances 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 5
- 239000013505 freshwater Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000001035 drying Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 15
- 230000008929 regeneration Effects 0.000 description 5
- 238000011069 regeneration method Methods 0.000 description 5
- 239000002808 molecular sieve Substances 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000000935 solvent evaporation Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The open a kind of efficient spraying solvent recovering system of the present invention and technique thereof, it adopts chemical industry absorption tower pattern, absorbs the nmp solvent in gas with water.The gas containing nmp solvent of discharging in application or drying device reaches the recycling of solvent by the gas gas-heat exchanger of this recovery system, reducing temperature twice absorption tower.By the recycling completely of solvent, really avoid unnecessary exhaust emissions to cause air-polluting situation, and then effectively improve environmental benefit.Remarkable advantage of the present invention is: 1, operating power consumption is low, processes every ten thousand mark cube gas power consumptions lower than 23kw.h; 2, in tail gas, NMP content is low, lower than below 30ppm; 3, liquid does not flow backwards, and pipeline is without leakage; 4, running device is few, and maintenance cost reduces; 5, the heat energy in hot blast is fully used.
Description
Technical field
This patent is system about NMP (1-METHYLPYRROLIDONE) solvent recovery in the dry gas of a kind of loop circuit and technique thereof.A closed circulation is formed by application or between drying unit and this recovery process,
Background technology
NMP (1-METHYLPYRROLIDONE) is efficient selective solvent, has nontoxicity, higher boiling, corrosivity is little, solubility is large, viscosity is low, volatility is low, the advantage such as good stability, easily recovery.Purposes is widely had, main following several respects in various industry:
(1) NMP is used as the solvent etc. of polyvinylidene fluoride, and the electrode auxiliary material of lithium ion battery.
(2) can be used for photoresist and remove liquid, LCD liquid crystal material is produced;
(3) solvent that medicine is produced is applied to;
(4) semicon industry precision instrument, wiring board clean.
When NMP is as solvent, the solvent recovery of its dried tail gas is energy-saving and cost-reducing key point always, and the qualified discharge of tail gas is also one of controlling difficulties;
NMP recovery process main at present has two kinds, is respectively molecular sieve technique, runner technique.
1, molecular sieve technique:
Adopt cooling water, chilled water directly hot gas to be cooled to less than 10 DEG C, then to be absorbed by molecular sieve;
The advantage of this technique is: primary equipment investment cost is low
The weak point of this technique has: one, energy consumption is large, processes every ten thousand mark cube gas power consumptions at about 40kw.h; Two, in tail gas, NMP content is high, at more than 80ppm; Three, liquid easily flows backwards air inlet duct, causes a large amount of leakage; Four, running device is many, and noise is large, and maintenance cost is high.
2, runner technique
Runner technique is the VOC molecular sieve pinwheel technique developed by Japan: runner is separated into 3 regions, one be treatment region, one be cooling zone, a Ge Shi desorption district, VOC runner rotates in the course of the work slowly, need gas to be processed from the gas becoming relative clean after treatment region flows through containing organic solvent, in the gas after process, the content of organic solvent is minimum is down to below 50ppm.Another part flows through from cooling zone under the effect of regeneration blower fan containing the air of organic solvent, then after being heated to certain temperature, flow through from rotary wheel regeneration region, because rotary wheel regeneration region is reproduced air heat, the organic solvent evaporation being adsorbed on regeneration zone is out taken away with regeneration air.After waste gas is concentrated to certain concentration, utilize freezing that NMP condensation just can be made to reclaim.
This technological advantage is: in tail gas, NMP content is lower, can reach 50PPM, compare environmental protection, and exhaust-gas treatment directly can discharge air well.
The shortcoming of this technique is: one, because complete set of equipments needs import, and equipment investment volume is large; Two, energy consumption is large, processes every ten thousand mark cube gas power consumptions and reaches 45kw.h.
Summary of the invention
The object of the present invention is to provide a kind of efficient spraying solvent recovering system and technique thereof, it makes the nmp solvent that application or drying unit volatilize substantially all reclaim in native system, not only energy-conserving and environment-protective, make unnecessary gas qualified discharge, with season, the solvent of volatilization is recycled, and then reduces the consumption of solvent.
For achieving the above object, technical solution of the present invention is:
One efficiently sprays solvent recovering system, forms primarily of the gas gas-heat exchanger 01 sequentially connected, one-level absorption column of gas 02, blower fan 04, secondary gas absorption tower 05; Described one-level absorption column of gas 02 connects an one-level absorbing liquid circulating pump 03 and forms a closed high concentration spraying solvent cyclic absorption loop; Described secondary gas absorption tower 05 sequentially connects secondary absorbing liquid circulating pump 06, liquid-liquid heat exchanger 07 and forms a closed low concentration spraying solvent cyclic absorption loop.
Adopt the recovery process flow process of the efficient spraying solvent recovering system of said structure:
1. the gas containing nmp solvent enters one-level absorption column of gas 02 after gas gas-heat exchanger 01 with recyclegas heat exchange, this one-level absorption column of gas 02 tower top spray high-concentration absorbent liquid, delivers to tower top by first order absorption liquid circulating pump 03 after this high-concentration absorbent liquid is down to tower reactor and carries out cyclic absorption;
2. the gas after one-level absorption column of gas 02 absorbs is by the pressurization of blower fan 04, enter secondary gas absorption tower 05, two-level absorption tower 05 tower top spray low-concentration absorption liquid, this low-concentration absorption liquid is sequentially delivered to tower top by secondary absorbing liquid circulating pump 06, liquid-liquid heat exchanger 07 after lowering the temperature after being down to tower reactor and is carried out cyclic absorption, adopts fresh water of adding to carry out third time absorption at tower top;
3. the gas 2. fully absorbed through step deliver to gas gas-heat exchanger 01 heat up Posterior circle use, the direct emptying of redundance gas.
The usefulness of technique scheme is:
The present invention adopts chemical industry absorption tower pattern, absorbs the nmp solvent in gas with water.The gas containing nmp solvent of discharging in application or drying device reaches the recycling of solvent by the gas gas-heat exchanger of this recovery system, reducing temperature twice absorption tower.By the recycling completely of solvent, really avoid unnecessary exhaust emissions to cause air-polluting situation, and then effectively improve environmental benefit.Remarkable advantage of the present invention is: 1, operating power consumption is low, processes every ten thousand mark cube gas power consumptions lower than 23kw.h; 2, in tail gas, NMP content is low, lower than below 30ppm; 3, liquid does not flow backwards, and pipeline is without leakage; 4, running device is few, and maintenance cost reduces; 5, the heat energy in hot blast is fully used.
Accompanying drawing explanation
Fig. 1: present system structural representation.
Detailed description of the invention
Existing accompanying drawings apparatus of the present invention and process implementing process:
Primary clustering symbol description: gas gas-heat exchanger 01, one-level absorption column of gas 02, first order absorption liquid circulating pump 03, blower fan 04, two-level absorption tower 05, secondary absorbing liquid circulating pump 06, liquid-liquid heat exchanger 07.
As shown in Figure 1, one of the present invention efficiently sprays solvent recovering system, forms primarily of the gas gas-heat exchanger 01 sequentially connected, one-level absorption column of gas 02, blower fan 04, secondary gas absorption tower 05.
Described one-level absorption column of gas 02 connects an one-level absorbing liquid circulating pump 03 and forms a closed high concentration spraying solvent cyclic absorption loop.
Described secondary gas absorption tower 05 sequentially connects secondary absorbing liquid circulating pump 06, liquid-liquid heat exchanger 07 and forms a closed low concentration spraying solvent cyclic absorption loop.
Adopt the recovery process process step of the efficient spraying solvent recovering system of said structure as follows:
1. the gas containing nmp solvent enters one-level absorption column of gas 02 after gas gas-heat exchanger 01 with recyclegas heat exchange, and this one-level absorption column of gas 02 tower top spray high-concentration absorbent liquid, this high-concentration absorbent liquid is the NMP aqueous solution containing 75 ~ 90%.Deliver to tower top by first order absorption liquid circulating pump 03 after this high-concentration absorbent liquid is down to tower reactor and carry out cyclic absorption, form a closed high concentration spraying solvent cyclic absorption loop.Circulation fluid temperature in this high concentration spraying solvent cyclic absorption loop controls at 50 ~ 70 DEG C.
2. the gas after step 1. one-level absorption column of gas 02 absorption, by the pressurization of blower fan 04, enters secondary gas absorption tower 05, and this tower top, secondary gas absorption tower 05 spray low-concentration absorption liquid, this low-concentration absorption liquid is the NMP aqueous solution containing 20 ~ 40%.This low-concentration absorption liquid is down to after tower reactor by after secondary absorbing liquid circulating pump 05 adherence pressure, deliver to tower top by liquid-liquid heat exchanger 07 cooling and carry out cyclic absorption, form a closed low concentration spraying solvent cyclic absorption loop, the circulation fluid temperature in this low concentration spraying solvent cyclic absorption loop controls at 15 ~ 40 DEG C.Tower top adopt fresh add water carry out third time absorb (every ten thousand mark cube gases adds water rate control at 50l/h ~ 250l/h; Control first grade absorption tower NMP aqueous solution extraction concentration and need be greater than 80%).
3. the gas 2. fully absorbed through step deliver to gas gas-heat exchanger 01 heat up Posterior circle use, the direct emptying of redundance gas (controlling the scale of construction of dropping a hint by system pressure).
This patent operating power consumption is low, and every ten thousand mark cube gas treatment power consumptions are lower than 22kw.h; In tail gas, NMP content is low, can control at below 30ppm; Liquid does not flow backwards, and pipeline can not produce leakage; Running device is few, and maintenance cost reduces; Heat energy in hot blast is fully used.
Claims (9)
1. efficiently spray a solvent recovering system, be characterised in that: this system is primarily of the gas gas-heat exchanger sequentially connected, one-level absorption column of gas, blower fan, secondary gas absorption tower composition; Described one-level absorption column of gas connects an one-level absorbing liquid circulating pump and forms a closed high concentration spraying solvent cyclic absorption loop; Described secondary gas absorption tower sequentially connects a secondary absorbing liquid circulating pump, a liquid-liquid heat exchanger forms a closed low concentration spraying solvent cyclic absorption loop; The technological process utilizing this efficiently to spray solvent recovering system is as follows:
1. the gas containing nmp solvent enters one-level absorption column of gas after gas gas-heat exchanger and recyclegas heat exchange, this one-level GAS ABSORPTION column overhead spray high-concentration absorbent liquid, delivers to tower top by first order absorption liquid circulating pump after this high-concentration absorbent liquid is down to tower reactor and carries out cyclic absorption;
2. the gas after one-level absorption column of gas absorbs is by the pressurization of blower fan, enter secondary gas absorption tower, two-level absorption tower tower top spray low-concentration absorption liquid, this low-concentration absorption liquid is sequentially delivered to tower top carried out cyclic absorption by secondary absorbing liquid circulating pump, liquid-liquid heat exchanger after being down to tower reactor, and tower top adopts fresh water of adding to carry out third time absorption;
3. the gas 2. fully absorbed through step is delivered to gas gas-heat exchanger intensification Posterior circle and is used, the direct emptying of redundance gas.
2. one as claimed in claim 1 efficiently sprays solvent recovering system, it is characterized in that: the technological process of this system is as follows: the step high-concentration absorbent liquid that 1. middle one-level GAS ABSORPTION column overhead sprays is the NMP aqueous solution of concentration 75 ~ 90%; The step low-concentration absorption liquid that 2. middle secondary gas absorbing tower top spray is drenched is the NMP aqueous solution of concentration 20 ~ 40%.
3. one as claimed in claim 2 efficiently sprays solvent recovering system, it is characterized in that: the circulation fluid temperature in the high concentration spraying solvent cyclic absorption loop formed by one-level absorption column of gas and first order absorption liquid circulating pump controls at 50 ~ 70 DEG C.
4. one as claimed in claim 2 efficiently sprays solvent recovering system, is characterised in that: the circulation fluid temperature in the low concentration spraying solvent cyclic absorption loop formed by secondary gas absorption tower, secondary absorbing liquid circulating pump and a liquid-liquid heat exchanger controls at 15 ~ 40 DEG C.
5. one as claimed in claim 3 efficiently sprays solvent recovering system, is characterised in that: the circulation fluid temperature in the low concentration spraying solvent cyclic absorption loop formed by secondary gas absorption tower, secondary absorbing liquid circulating pump and a liquid-liquid heat exchanger controls at 15 ~ 40 DEG C.
6. one as claimed in claim 2 efficiently sprays solvent recovering system, is characterised in that: step 2. in, in secondary gas absorption tower, every ten thousand mark cube gases adds water rate control at 50l/h ~ 250l/h; NMP aqueous solution extraction concentration need be greater than 80%.
7. one as claimed in claim 3 efficiently sprays solvent recovering system, is characterised in that: step 2. in, in secondary gas absorption tower, every ten thousand mark cube gases adds water rate control at 50l/h ~ 250l/h; NMP aqueous solution extraction concentration need be greater than 80%.
8. one as claimed in claim 4 efficiently sprays solvent recovering system, is characterised in that: step 2. in, in secondary gas absorption tower, every ten thousand mark cube gases adds water rate control at 50l/h ~ 250l/h; NMP aqueous solution extraction concentration need be greater than 80%.
9. one as claimed in claim 5 efficiently sprays solvent recovering system, is characterised in that: step 2. in, in secondary gas absorption tower, every ten thousand mark cube gases adds water rate control at 50l/h ~ 250l/h; NMP aqueous solution extraction concentration need be greater than 80%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110343266.2A CN103084043B (en) | 2011-11-03 | 2011-11-03 | A kind of efficient spraying solvent recovering system and technique thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110343266.2A CN103084043B (en) | 2011-11-03 | 2011-11-03 | A kind of efficient spraying solvent recovering system and technique thereof |
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| CN103084043A CN103084043A (en) | 2013-05-08 |
| CN103084043B true CN103084043B (en) | 2015-09-16 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103920359B (en) * | 2014-04-14 | 2016-05-11 | 湖州新利商标制带有限公司 | A kind of trademark belt coating solvent recovery unit and recovery method |
| CN104107616A (en) * | 2014-08-14 | 2014-10-22 | 叶大煜 | NMP (N-Methyl Pyrrolidone) gas treating equipment and treating process thereof |
| CN104274993A (en) * | 2014-09-23 | 2015-01-14 | 马军 | Device for recycling organic solvent from waste color-coated aluminum production gas |
| CN105148684A (en) * | 2015-08-15 | 2015-12-16 | 慈溪市赛思德环保科技有限公司 | Novel spray equipment |
| CN105056706A (en) * | 2015-08-19 | 2015-11-18 | 常州大学 | Methanol waste gas recycling system based on secondary absorption |
| CN108404604B (en) * | 2018-03-23 | 2023-11-28 | 中创新航技术研究院(江苏)有限公司 | Circulating type low dew point NMP (N-methyl pyrrolidone) recovery system and operation method thereof |
| CN111871150A (en) * | 2020-07-13 | 2020-11-03 | 刘德国 | Tower recovery system of NMP |
| CN116173713A (en) * | 2023-03-20 | 2023-05-30 | 重庆中润新材料股份有限公司 | Treatment method for tail gas generated in methylamine and NMP production |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102120098A (en) * | 2011-01-24 | 2011-07-13 | 宁波伊司达锂电池有限公司 | Device and method for recycling N-methylpyrrolidone in process of producing lithium battery |
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