CN103143237A - Toluene-containing tail gas recycling process in refractory mica tape production - Google Patents
Toluene-containing tail gas recycling process in refractory mica tape production Download PDFInfo
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- CN103143237A CN103143237A CN2013100820735A CN201310082073A CN103143237A CN 103143237 A CN103143237 A CN 103143237A CN 2013100820735 A CN2013100820735 A CN 2013100820735A CN 201310082073 A CN201310082073 A CN 201310082073A CN 103143237 A CN103143237 A CN 103143237A
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Abstract
The invention relates to a toluene-containing tail gas recycling process in refractory mica tape production and belongs to the technical fields of resource recycling and environmental protection. Based on the conventional absorptive method, the toluene-containing tail gas recycling process is characterized in that an organic acid salt or inorganic acid (ether) salt aqueous solution is used as absorption liquid, so that the absorbing effect is better, the production safety problem of the conventional absorption method is effectively solved, toluene is recycled and the absorption liquid is recycled without generating secondary pollution; and the environmental protection problem of the toluene tail gas is solved and the toluene solvent is effectively recycled, therefore, the toluene-containing tail gas recycling process belongs to the energy-saving emission-reducing advantage project. The toluene-containing tail gas recycling process disclosed by the invention is simple; the treated tail gas reaches the national environmental protection emission requirements; the resources are saved; the toluene solvent is recycled; and the relevant national industrial polices for encouraging the chemical industries to save energy and reduce emission are satisfied. Besides, the toluene-containing tail gas not only can be used for recycling the toluene-containing tail gas in the refractory mica tape production, but also can be popularized to the recycling of toluene-containing tail gas in other fields.
Description
Technical field
The present invention relates to contain the toluene solvent recovery technology from vent gas in a kind of fire-resistant isinglass belt production, belong to resource circulation utilization and environmental technology field.
Background technology
Toluene as solvent, finally needs drying in fire-resistant isinglass belt is produced, thereby toluene evaporate in workshop air, has a strong impact on air quality, and produces larger environmental issue, as not reclaimed or processing, affects production environment.Toluene is as volatile organic matter (Voc), and environment and animals and plants and health are caused great injury, and the toluene degree of depth is poisoning has considerable influence to nervous centralis, can occur neural strong excited or suppress performance, as the symptom such as restless, stupefied, drowsiness.If toluene is diffused in air, produce photochemical reaction with nitrogen oxide under action of ultraviolet radiation, the mankind and ecological environment generation are had a strong impact on.
Toluene vent gas treatment technology has absorption method, catalytic oxidation, biological treatment, plasma technique facture and absorption process.Absorption method active carbon commonly used is made adsorbent, active carbon has that specific area is large, the aperture is little and narrowly distributing, adsorbance is large, adsorption rate is fast, filtration resistance is little, energy of adsorption high-technology characteristics, being widely used in various industrial tail gas processes, absorbing process generally adopts the circular regeneration method, after regeneration, toluene is reclaimed in circulation, and the frequent replacing of adsorbent is this method disadvantage; Catalytic oxidation is the other method that organic tail gas purifies, and its key problem in technology is catalyst, and this method can not be recycled the useful resources in tail gas, and catalyst stability and price are used this law to be difficult to promote; Biological treatment be mat love smelly vacation is unicellular has degradation capability to process toluene tail gas to organic matter, bibliographical information is with A
1The smelly unicellular bacterial classification of type love is carried on the hydrophobicity polyethylene hollow fiber membrane, processes toluene tail gas, and the clearance of toluene reaches 86.0～97.0%, and the method key is the cultivation of bacterial classification, and treating capacity is smaller; Plasma treatment technique is newer vent gas treatment technology, is to utilize pulsed corona reactor that toluene is degraded, and the toluene removal rate can reach 100%, but the Pulse Corona Techology energy consumption is larger; Absorption process is traditional and ripe tail gas treatment process, applicability is wide, absorption process is to utilize the dissolubility of toluene in some solvent, adopts the oil-based solvent absorption cleaning of higher boiling, low-vapor pressure to contain toluene tail gas, this treatment process investment less, cost saving.Gas toluene tradition absorption process is take organic solvent as absorption liquid, make and contain toluene tail gas and contact in the absorption tower with organic solvent, gas toluene is absorbed by organic solvent, the absorption liquid that contains toluene after absorption is recycled toluene through rectifying column rectifying again, and the organic solvent after distillation desorption is cycled to used in absorption after cooling.The device that the tradition absorption process reclaims toluene comprises the unit operations such as absorption tower, rectifying column.The organic solvent that uses comprises diesel oil etc., and these organic solvents are inflammable and explosive, and production process exists larger insecurity, less use.
Summary of the invention
The purpose of this invention is to provide in a kind of fire-resistant isinglass belt production and contain the toluene solvent recovery technology from vent gas, overcome the insecurity that organic solvent is inflammable and explosive, the production process existence is larger such as comprising diesel oil in existing absorption process because of employing, the present invention makes not only that in tail gas, toluene effectively reclaims, and the absorption liquid reusable edible that uses in reclaiming, effectively solved the improvement environmental issue that contains toluene tail gas, made to contain toluene tail gas and reach relevant emission standards.
The objective of the invention is to be achieved through the following technical solutions, contain the toluene solvent recovery technology from vent gas in a kind of fire-resistant isinglass belt production, it is characterized in that, described technique comprises the following steps:
(1) bottom that contains toluene tail gas self-absorption tower of discharging in the fire-resistant isinglass belt process units is introduced, carrying out gas-liquid counter current with the absorption liquid of the acylate that enters from the absorption tower top spray or inorganic acid ester (salt) aqueous solution under 20 ℃～70 ℃, 0.1MPa contacts, complete the toluene absorption process, piptonychia benzene gas rear self-absorption tower top discharge up to standard;
(2) in the absorption tower when the absorptivity of toluene tail gas reaches 75～90%, contain the toluene absorption liquid and enter storage tank, to contain toluene absorption liquid heater via heating through pump enters desorber carry out desorb under 90 ℃～120 ℃, 0.1MPa, the desorber tower top obtains toluene-water azeotropic mixture, enter the layering of layering groove after the azeotropic mixture condensation, toluene is rich on the upper strata, obtains toluene after super-dry;
(3) reach 95% when above when above-mentioned absorption liquid desorption rate, the toluene that produces after desorb is taken out from the layering groove produce recycling; Absorption liquid after desorb is cooled to 20 ℃～50 ℃ from desorber introducing storage tank to be recycled by being pumped to the absorption tower.
The absorption liquid of described acylate or inorganic acid ester (salt) aqueous solution adopts the compound of one or more acylates or inorganic acid ester (salt) compounds.
In described acylate or inorganic acid ester (salt) aqueous solution, organic acid is acetic acid, oxalic acid, phthalic acid, terephthalic acid (TPA), M-phthalic acid, citric acid, naphthoic acid, benzene sulfonic acid, pyrovinic acid, p-methyl benzenesulfonic acid, (position, contraposition or ortho position) xylene monosulfonic acid, isopropyl sulfonic acid, and corresponding acylate is above-mentioned organic acid sodium salt, sylvite, ammonium salt; Inorganic acid is carbonic acid, silicic acid, sulfuric acid, phosphoric acid, and corresponding inorganic acid ester (salt) is sodium salt, sylvite, the ammonium salt of above-mentioned inorganic acid.
The mass percent concentration of the aqueous solution is 1～15%.
The liquid-gas ratio scope of absorption process is 0.8kg/kg～18.8 kg/kg.
The present invention is on the basis of traditional absorption process, adopt acylate or inorganic acid (ester) saline solution as absorption liquid, assimilation effect is better, efficiently solve traditional absorption process production safety problem, reclaim toluene, absorption liquid recycles, do not produce secondary pollution, both solve the environmental issue of toluene tail gas, effectively reclaimed again toluene solvant, belonged to the energy-saving and emission-reduction strong event.Treatment process of the present invention is simple, tail gas after processing reaches the environment protection emission requirement of national regulation, saved resource, realize recycling of toluene solvant, meet country and chemical industry is encouraged the related industry policy of energy-saving and emission-reduction, the present invention not only is used for the recovery that fire-resistant isinglass belt production contains toluene tail gas, can also extend to the recovery that other field contains toluene tail gas.
Description of drawings
Fig. 1 is that the present invention absorbs treatment process process sketch.
The specific embodiment
Further illustrate in conjunction with the accompanying drawings and embodiments the present invention, the present invention absorbs the treatment process process as shown in Figure 1.Absorb treatment process and condition stub as follows: contain toluene tail gas and enter the absorption tower, with 0.8kg
Absorption liquid/ kg
Gas～18.8 kg
Absorption liquid/ kg
GasLiquid-gas ratio, under 20 ℃～70 ℃ and 0.1MPa, concentration of aqueous solution 1～15%(mass percent concentration of absorption liquid), carry out the gas-liquid counter current contact, complete the toluene absorption process; After absorption liquid absorbs, the rear discharging up to standard of piptonychia benzene gas; Contain the toluene absorption liquid and enter storage tank, will contain the heating of toluene absorption liquid heater via with pump and enter the desorber desorb, the desorber tower top obtains toluene-water azeotropic mixture, enters the layering of layering groove after the azeotropic mixture condensation, and toluene is rich on the upper strata, obtains toluene after super-dry; Absorption liquid through desorb enters storage tank, and absorption liquid is transported to the absorption tower tower top after cooler is cooling with pump, for absorbing reuse.
One or more mixed aqueous solutions that absorption liquid of the present invention is following material comprise the compound of acylate or inorganic acid ester (salt) compounds.
The present invention's absorption liquid aqueous solution used is by the aqueous solution of the materials such as acylate or inorganic acid ester (salt).Organic acid is acetic acid, oxalic acid, phthalic acid, terephthalic acid (TPA), M-phthalic acid, citric acid, naphthoic acid, benzene sulfonic acid, pyrovinic acid, p-methyl benzenesulfonic acid, (position, contraposition or ortho position) xylene monosulfonic acid, isopropyl sulfonic acid, and corresponding acylate is above-mentioned organic acid sodium salt, sylvite, ammonium salt etc.Inorganic acid is carbonic acid, silicic acid, sulfuric acid, phosphoric acid, and corresponding inorganic acid ester (salt) is sodium salt, sylvite, the ammonium salt of above-mentioned inorganic acid.
Absorption liquid concentration of aqueous solution 1～15%(mass percent concentration that the present invention is used), more excellent concentration range 5～9%(mass percent concentration).
Absorption process of the present invention, the liquid-gas ratio scope of absorption operation is 0.8kg
Absorption liquid/ kg
Gas～18.8 kg
Absorption liquid/ kg
Gas, more excellent gas liquid ratio scope is 4.2 kg
Absorption liquid/ kg
Gas～9.6 kg
Absorption liquid/ kg
Gas
Absorption liquid of the present invention absorbs to process and contains toluene tail gas method and make not only that in tail gas, toluene effectively reclaims, and absorption liquid is recycling, has effectively solved the improvement environmental issue that contains toluene tail gas, makes to contain toluene tail gas and reach relevant emission standards.
Embodiment 1
Contain toluene 1250mg/m
3Tail gas enter the absorption tower, use the 9%(mass percent) sodium citrate aqueous solution (adding in right amount sodium metasilicate), with 4.5kg
Absorption liquid/ kg
GasLiquid-gas ratio, under 40 ℃ and 0.1MPa, carry out the gas-liquid counter current contact, complete the toluene absorption process; After absorption liquid absorbs, toluene concentration 42.3 mg/m in the piptonychia benzene gas
3Contain the toluene absorption liquid and enter storage tank, will contain the heating of toluene absorption liquid heater via with pump and enter the desorber desorb, the desorber tower top obtains toluene-water azeotropic mixture, enters the layering of layering groove after the azeotropic mixture condensation, and toluene is rich on the upper strata, obtains toluene after super-dry; Absorption liquid through desorb enters storage tank, and absorption liquid is transported to the absorption tower tower top after cooler is cooling with pump, for absorbing reuse.
Embodiment 2
Contain toluene 850mg/m
3Tail gas enter the absorption tower, use the 5%(mass percent) aqueous sodium acetate solution (adding in right amount paratoluenesulfonic acid sodium salt), with 4.0kg
Absorption liquid/ kg
GasLiquid-gas ratio, under 35 ℃ and 0.1MPa, carry out the gas-liquid counter current contact, complete the toluene absorption process; After absorption liquid absorbs, toluene concentration 22.3 mg/m in the piptonychia benzene gas
3Contain the toluene absorption liquid and enter storage tank, will contain the heating of toluene absorption liquid heater via with pump and enter the desorber desorb, the desorber tower top obtains toluene-water azeotropic mixture, enters the layering of layering groove after the azeotropic mixture condensation, and toluene is rich on the upper strata, obtains toluene after super-dry; Absorption liquid through desorb enters storage tank, and absorption liquid is transported to the absorption tower tower top after cooler is cooling with pump, for absorbing reuse.
Embodiment 3
Contain toluene 650mg/m
3Tail gas enter the absorption tower, use the 4%(mass percent) xylene monosulfonic acid sodium water solution (adding in right amount sodium carbonate), with 3.6kg
Absorption liquid/ kg
GasLiquid-gas ratio, under 25 ℃ and 0.1MPa, carry out the gas-liquid counter current contact, complete the toluene absorption process; After absorption liquid absorbs, toluene concentration 16.3 mg/m in the piptonychia benzene gas
3Contain the toluene absorption liquid and enter storage tank, will contain the heating of toluene absorption liquid heater via with pump and enter the desorber desorb, the desorber tower top obtains toluene-water azeotropic mixture, enters the layering of layering groove after the azeotropic mixture condensation, and toluene is rich on the upper strata, obtains toluene after super-dry; Absorption liquid through desorb enters storage tank, and absorption liquid is transported to the absorption tower tower top after cooler is cooling with pump, for absorbing reuse.
Embodiment 4
Contain toluene 460mg/m
3Tail gas enter the absorption tower, use the 5%(mass percent) isopropyl sulfonic acid sodium water solution (adding in right amount sodium metasilicate), with 3.2kg
Absorption liquid/ kg
GasLiquid-gas ratio, under 25 ℃ and 0.1MPa, carry out the gas-liquid counter current contact, complete the toluene absorption process; After absorption liquid absorbs, toluene concentration 13.3 mg/m in the piptonychia benzene gas
3Contain the toluene absorption liquid and enter storage tank, will contain the heating of toluene absorption liquid heater via with pump and enter the desorber desorb, the desorber tower top obtains toluene-water azeotropic mixture, enters the layering of layering groove after the azeotropic mixture condensation, and toluene is rich on the upper strata, obtains toluene after super-dry; Absorption liquid through desorb enters storage tank, and absorption liquid is transported to the absorption tower tower top after cooler is cooling with pump, for absorbing reuse.
Claims (5)
1. contain the toluene solvent recovery technology from vent gas in a fire-resistant isinglass belt production, it is characterized in that, described technique comprises the following steps:
(1) bottom that contains toluene tail gas self-absorption tower of discharging in the fire-resistant isinglass belt process units is introduced, carrying out gas-liquid counter current with the absorption liquid of the acylate that enters from the absorption tower top spray or inorganic acid ester (salt) aqueous solution under 20 ℃～70 ℃, 0.1MPa contacts, complete the toluene absorption process, piptonychia benzene gas rear self-absorption tower top discharge up to standard;
(2) in the absorption tower when the absorptivity of toluene tail gas reaches 75～90%, contain the toluene absorption liquid and enter storage tank, to contain toluene absorption liquid heater via heating through pump enters desorber carry out desorb under 90 ℃～120 ℃, 0.1MPa, the desorber tower top obtains toluene-water azeotropic mixture, enter the layering of layering groove after the azeotropic mixture condensation, toluene is rich on the upper strata, obtains toluene after super-dry;
(3) reach 95% when above when above-mentioned absorption liquid desorption rate, the toluene that produces after desorb is taken out from the layering groove produce recycling; Absorption liquid after desorb is cooled to 20 ℃～50 ℃ from desorber introducing storage tank to be recycled by being pumped to the absorption tower.
2. toluene solvent recovery technology from vent gas during fire-resistant isinglass belt according to claim 1 is produced, it is characterized in that, the absorption liquid of described acylate or inorganic acid ester (salt) aqueous solution adopts the compound of one or more acylates or inorganic acid ester (salt) compounds.
3. toluene solvent recovery technology from vent gas during fire-resistant isinglass belt according to claim 1 and 2 is produced, it is characterized in that, in described acylate or inorganic acid ester (salt) aqueous solution, organic acid is acetic acid, oxalic acid, phthalic acid, terephthalic acid (TPA), M-phthalic acid, citric acid, naphthoic acid, benzene sulfonic acid, pyrovinic acid, p-methyl benzenesulfonic acid, (position, contraposition or ortho position) xylene monosulfonic acid, isopropyl sulfonic acid, and corresponding acylate is above-mentioned organic acid sodium salt, sylvite, ammonium salt; Inorganic acid is carbonic acid, silicic acid, sulfuric acid, phosphoric acid, and corresponding inorganic acid ester (salt) is sodium salt, sylvite, the ammonium salt of above-mentioned inorganic acid.
4. toluene solvent recovery technology from vent gas during fire-resistant isinglass belt according to claim 2 is produced is characterized in that the mass percent concentration of the aqueous solution is 1～15%.
5. toluene solvent recovery technology from vent gas during fire-resistant isinglass belt according to claim 1 is produced is characterized in that the liquid-gas ratio scope of absorption process is 0.8kg/kg～18.8 kg/kg.
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| CN2013100820735A CN103143237A (en) | 2013-03-15 | 2013-03-15 | Toluene-containing tail gas recycling process in refractory mica tape production |
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| CN2013100820735A CN103143237A (en) | 2013-03-15 | 2013-03-15 | Toluene-containing tail gas recycling process in refractory mica tape production |
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Cited By (6)
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| CN103752138A (en) * | 2014-01-22 | 2014-04-30 | 北京嘉品源软件有限公司 | Waste gas filtering system and method |
| CN107303456A (en) * | 2016-04-21 | 2017-10-31 | 李润超 | A kind of device of Collecting and dealing uncontrollable discharge gas |
| CN109529545A (en) * | 2018-12-12 | 2019-03-29 | 安徽金禾实业股份有限公司 | A kind of methyl acetoacetate exhaust gas treating method and device |
| CN109596559A (en) * | 2018-11-08 | 2019-04-09 | 苏州宝化炭黑有限公司 | The associated detecting method and detection system of carbon black tail gas each component content |
| CN112675663A (en) * | 2020-11-26 | 2021-04-20 | 浙江工业大学 | Toluene tail gas treatment method |
| CN115487667A (en) * | 2022-09-15 | 2022-12-20 | 湖南湘渝科技有限公司 | Tail gas absorption process for caramel color production by using common method |
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Cited By (8)
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| CN103752138A (en) * | 2014-01-22 | 2014-04-30 | 北京嘉品源软件有限公司 | Waste gas filtering system and method |
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| CN109529545A (en) * | 2018-12-12 | 2019-03-29 | 安徽金禾实业股份有限公司 | A kind of methyl acetoacetate exhaust gas treating method and device |
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| CN115487667A (en) * | 2022-09-15 | 2022-12-20 | 湖南湘渝科技有限公司 | Tail gas absorption process for caramel color production by using common method |
| CN115487667B (en) * | 2022-09-15 | 2024-03-26 | 湖南湘渝科技有限公司 | Tail gas absorption process for caramel color production by common method |
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Application publication date: 20130612 |