CN101451712B - End gas recovering and utilizing process for methylmethacrylate producing device - Google Patents
End gas recovering and utilizing process for methylmethacrylate producing device Download PDFInfo
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- CN101451712B CN101451712B CN2009100664054A CN200910066405A CN101451712B CN 101451712 B CN101451712 B CN 101451712B CN 2009100664054 A CN2009100664054 A CN 2009100664054A CN 200910066405 A CN200910066405 A CN 200910066405A CN 101451712 B CN101451712 B CN 101451712B
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Abstract
The invention discloses a tail gas recycling technique in a methyl methacrylate generating device. A methyl methacrylate esterifying unit and a methyl methacrylate refining unit buffer tank for collecting tail gas are arranged. The tail gas is pressurized to 0.15-0.18MP by a fan and then is sent into an incinerator in a vitriol recycling device matching with the device of the invention to be incinerated so as to change waste into useful materials. The fan is added with nitrogen heated by a heater at an inlet thereof to stabilize gas transmission flow of the fan and prevent sulphur oxide from being crystallized. Advantage of the invention is that methyl methacrylate tail gas is not exhausted into air, thus decreasing environment pollution, changing waste into useful materials used as power fuel of the incineratorn and fully using waste. By the technique, a set of methyl methacrylate generating device of which the output is 100,000 tons per year can save over 2000,000 RMB each year. So the economic benefit and the social benefit are obvious.
Description
Technical field
The present invention relates to a kind of production technique of organic chemicals methyl methacrylate
Background technology
The production technology of methyl methacrylate mainly based on acetone cyanohydrin (ACH) method, accounts for 83% of worldwide production ability in the world.The acetone cyanohydrin method is constantly improved and improvement through long-term, advanced technology, mature and reliable, good product quality, obtained extensive employing, this technology has effectively been utilized petrochemical complex by product prussic acid, and the yield height of methyl methacrylate, be the production technology one big advantage of methyl methacrylate.
The tail gas that present domestic methylmethacrylate producing device produced, contain methyl methacrylate and sulfur oxide, the wherein easy polymerization of methyl methacrylate, the easy crystallization of sulfur oxide, methyl methacrylate polymerization in course of conveying, sulfur oxide crystallization meeting blocking pipeline and equipment can not be discharged to flare system, usually directly the high-altitude is discharged to atmosphere, causes atmospheric pollution.Along with domestic environment protection treating requires more and more strictness, it is unallowed directly being discharged to atmosphere.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, the technology that tail gas recycle is also utilized in a kind of methylmethacrylate producing device is provided.
Tail gas recycle in a kind of methylmethacrylate producing device, utilize technology, it is characterized in that:
1, is provided with methylmethacrylate producing device esterification unit tail gas buffer V-1, be provided with methylmethacrylate producing device refined unit methyl methacrylate tail gas buffer V-2, working pressure-2～0.5kPa of esterification unit tail gas buffer V-1 and methyl methacrylate tail gas buffer V-2,15～80 ℃ of working temperatures, design pressure-3～100kPa, 120 ℃ of design temperatures;
2, meet gas blower K-1 behind esterification unit tail gas buffer V-1, the methyl methacrylate tail gas buffer V-2 for guaranteeing steady running, charge flow rate is stable, needs to mend nitrogen.Cross when low when free air temperature, can be provided with nitrogen heater E-1, in time mend hot nitrogen, to improve exhaust temperature, for preventing that sulfur oxide from the pipeline intercrystalline of carrying tail gas, preventing its blocking pipe, 20～80 ℃ of gas blower K-1 medium working temperatures, its top hole pressure 0.1～0.18MPaG;
3, be provided with the automatization interlock protection device, outlet, source line obstruction as gas blower K-1, its pressure anomaly, by the pressure unit output signal, send DDC automatic control system, the machine K-1 that in time turns off the blast operation, close its inlet mouth valve, open the emptying valve, methyl methacrylate device safety, smooth running are guaranteed in pressure release in time;
4, the outlet of gas blower K-1 is provided with spark arrester F-1, and fricative electrical spark is scurried to pipeline when preventing gas blower K-1 operation, prevents from so cause medium to explode;
5, gas blower K-1 pressurization tail gas is delivered to sulfuric acid and is reclaimed unitary incinerator, as power fuel.
A, be provided with crude methacrylic acid methyl esters production equipment esterification unit tail gas buffer V-1, be provided with methylmethacrylate producing device refined unit finished product methyl methacrylate tail gas buffer V-2, working pressure-2～0.5kPa of esterification unit tail gas buffer V-1 and methyl methacrylate tail gas buffer V-2,15～80 ℃ of working temperatures, design pressure-3～100kPa, 120 ℃ of design temperatures;
Meet gas blower K-1 behind B, esterification unit tail gas buffer V-1 and the methyl methacrylate tail gas buffer V-2,20～80 ℃ of gas blower K-1 medium working temperatures, its top hole pressure 0.1～0.18MPaG;
C, gas blower K-1 ingress are provided with nitrogen and replenish pipe, add nitrogen, and be stable to guarantee gas blower K-1 charge flow rate;
D, gas blower K-1 exit are provided with spark arrester F-1, and the tail gas after the pressurization is delivered to the incinerator of sulphuric acid recovery device through pipeline, and burning acts as a fuel.
Implement beneficial effect of the present invention:
1, guarantees the tail gas of methyl methacrylate device esterification unit tail gas and the tail gas safe transport of rectification cell, directly be not disposed to atmosphere, reduce pollution, obvious social benefit physical environment.
2, Zhuan Zhi tail gas is utilized, the power fuel of the incinerator that reclaims as the unit sulfuric acid of forming a complete production network, turn waste into wealth, making it the energy is reclaimed, to produce 100000 tons of methyl methacrylate devices per year is example, but 600～800 tons of only this item fuel saving in every year oil are saved working cost 180～2,400,000 yuan.Tail gas is able to steady safe transport in addition, long period ordinary production that in addition can assurance device, and its economic benefit also is significant.
Description of drawings
Fig. 1 process flow diagram of the present invention
Embodiment
Below in conjunction with accompanying drawing and specific examples the present invention is made detailed description further.
To produce the example that is designed to of 100,000 tons of methyl methacrylate device exhaust delivery systems per year, set forth situation of the present invention.
1, establishes crude methacrylic acid methyl esters tail gas buffer and finished product methyl methacrylate tail gas buffer respectively at gas blower K-1 inlet, separate liquid and solid in the waste gas, prevent to stop up gas blower K-1, prevent that simultaneously esterification unit tail gas has channeling to rectification cell, influencing the quality of finished product methyl methacrylate.
The tail gas that the methyl methacrylate device produces is mainly from esterification unit, rectification cell.See Table 1 concrete the composition.
Table 1
| Media name | Unit | Esterification unit waste gas | Rectification cell waste gas | Add up to | Proportion % |
| Methyl alcohol | kg/h | 17.1 | 2.5 | 19.6 | 3.0 |
| Water | kg/h | 2.3 | 0.8 | 3.1 | 0.5 |
| Methyl methacrylate | kg/h | 14.1 | 1.4 | 15.5 | 2.3 |
| Carbon monoxide | kg/h | 187.4 | 0.1 | 187.5 | 28.4 |
| Sulfurous gas | kg/h | 17.4 | 5.6 | 23 | 3.5 |
| Acetone | kg/h | 49.7 | 21.2 | 70.9 | 10.7 |
| Dimethyl ether | kg/h | 159.7 | 50.9 | 210.6 | 31.9 |
| Methyl-formiate | kg/h | 5.3 | 14.9 | 20.2 | 3.1 |
| Methyl acetate | kg/h | 0.1 | 0.2 | 0.3 | 0.0 |
| Air | kg/h | 33.5 | 76.7 | 110.2 | 16.7 |
| Total flow rate | kg/h | 486.6 | 174.2 | 660.8 | 100.0 |
| Temperature | ℃ | 10～20 | 10～15 | ||
| Pressure | MPaG | 0 | 0 | ||
Scurry mutually in order to prevent esterification unit and rectification cell tail gas, influence final product quality, esterification unit and rectification cell tail gas are established manifold trunk and tail gas buffer respectively, described crude methacrylic acid methyl esters tail gas is the waste gas of esterification unit, described finished product methyl methacrylate tail gas is rectification cell waste gas, its parameter, component are listed in table 1, and manifold trunk adopts vertical, and take-off pipe 45 degree mitereds are to manifold trunk.Tail gas after gathering enters esterification unit tail gas buffer V-1, methyl methacrylate tail gas buffer V-2 respectively, in jar, stop 40～120 seconds laggard promoting the circulation of qi bodies and liquid separation, behind the waste collection jar, give the sulfuric acid apparatus of this matched with devices to be reclaimed behind the liquid collecting after the separation.Tail gas buffer import, outlet are provided with pressure superelevation warning, in case pipeline stops up, operator can in time find timely processing.Esterification unit tail gas buffer V-1, methyl methacrylate tail gas buffer V-2 top are provided with wire mesh demister; prevent that liquid or solid from entering tail gas supercharging blower K-1; on tail gas supercharging blower K-1 inlet duct, be provided with line strainer; to filter methyl methacrylate polymer in the pipeline, the safe operation of protection tail gas supercharging blower K-1.
2, be provided with nitrogen heater, control steam inlet amount guarantees the tail gas delivery temperature.
Free air temperature is low, 16.83 ℃ at sulfur oxide zero pour, for preventing sulfur oxide crystallization hanging tube wall blocking pipe, be provided with nitrogen heater E-1, in tail gas, replenish the part heated nitrogen winter, the tail gas delivery temperature maintains 60～80 ℃, guarantees system safety operation, and the control of exhaust temperature is to realize by the feed valve of gas blower K-1 temperature in automatic control system heating steam.
3, be provided with the nitrogen supplementary cords, realize that gas blower K-1 charge flow rate is stable, guarantee the steady running of gas blower K-1.
When methyl methacrylate device load variations, during the exhaust flow fluctuation, stable in order to guarantee gas blower K-1 inlet flow rate, being provided with nitrogen in the tail gas delivery system makes up line, the nitrogen magnitude of recruitment is regulated nitrogen feed by flow control system and is realized automatically, thereby guarantees the steady running of gas blower K-1.
4, be provided with the safety interlocking protection, in case gas blower K-1 enters the mouth, latch up phenomenon appears in outlet line, locking system starts automatically; gas blower K-1 imported valve is closed, and gas blower K-1 is out of service, is disposed to atmospheric switch-valve and opens; guarantee safety relief, thus the assurance device safe operation.
When the manometric pressure of source line of tail gas supercharging blower K-1 reached 0.05MPaG, gas blower K-1 import trip valve cut out, gas blower K-1 is out of service, is disposed to atmospheric emergency cutting off valve simultaneously and opens.
When the manometric pressure of outlet line of tail gas supercharging blower K-1 reached 0.2MPaG, gas blower K-1 import trip valve cut out, gas blower K-1 is out of service, is disposed to atmospheric emergency cutting off valve simultaneously and opens.
Be provided with safety valve at gas blower K-1 outlet line, gas blower K-1 top hole pressure is 0.1～0.18MPaG under standard state, when superelevation arrives 0.22MPaG, and the safety valve jumping up pressure release.Be provided with manual pressure release valve simultaneously,, manually after the pressure release, carry out maintenance process in case gas blower K-1 outlet line stops up.
5, be provided with spark arrester F-1 in gas blower K-1 import and export, prevent to scurry to pipeline to cause exploding because of the friction of gas blower K-1 self part produces electrical spark.The whole electrostatic groundings of whole line of pipes of while.Guarantee the delivery system safe operation.
6, sulfuric acid is one of main raw material during methyl methacrylate is produced, the spent acid solution of methyl methacrylate device by-product contains a large amount of sulfuric acid and hydrogen sulfate ammonia, common auxiliary construction sulphuric acid recovery device, generate sulfur oxide and then generate sulfuric acid after adopting the incinerator Pintsch process, return the recycling of methyl methacrylate device, to reduce production costs, prevent pollution to environment.At sulphuric acid recovery device, it burns unit power is oil fuel/gas, and the tail gas that the methyl methacrylate device is produced adds to incinerator and acts as a fuel, and the consumption of oil/gas capable of saving fuel is saved cost.Tail gas does not drain into atmosphere simultaneously, helps environment protection.
Claims (2)
- Tail gas recycle in the methylmethacrylate producing device, utilize technology, it is characterized in that:A, be provided with crude methacrylic acid methyl esters production equipment esterification unit tail gas buffer (V-1); Be provided with methylmethacrylate producing device refined unit finished product methyl methacrylate tail gas buffer (V-2), working pressure-2～the 0.5kPa of esterification unit tail gas buffer (V-1) and methyl methacrylate tail gas buffer (V-2), 15～80 ℃ of working temperatures, design pressure-3～100kPa, 120 ℃ of design temperatures;Connect gas blower (K-1) behind B, esterification unit tail gas buffer (V-1) and the methyl methacrylate tail gas buffer (V-2), 20～80 ℃ of gas blower (K-1) medium working temperatures, its top hole pressure 0.1～0.18MPaG;C, gas blower (K-1) ingress are provided with nitrogen and replenish pipe, add nitrogen, and be stable to guarantee gas blower (K-1) charge flow rate;D, gas blower (K-1) exit are provided with spark arrester (F-1), and the tail gas after the pressurization is delivered to the incinerator of sulphuric acid recovery device through pipeline, and burning acts as a fuel.
- According to the tail gas recycle in the described methylmethacrylate producing device of claim 1, utilize technology, it is characterized in that, described gas blower (K-1) ingress is provided with nitrogen and replenishes pipe, the nitrogen of adding heats through nitrogen heater (E-1), when free air temperature is low, be controlled at 60～80 ℃ to guarantee gas blower (K-1) temperature out.
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| CN2009100664054A CN101451712B (en) | 2009-01-01 | 2009-01-01 | End gas recovering and utilizing process for methylmethacrylate producing device |
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| CN2009100664054A CN101451712B (en) | 2009-01-01 | 2009-01-01 | End gas recovering and utilizing process for methylmethacrylate producing device |
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| CN101451712B true CN101451712B (en) | 2011-01-26 |
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| CN104139938B (en) * | 2014-08-01 | 2016-08-24 | 南京大学盐城环保技术与工程研究院 | A kind of storage tank tidal air collection and purification system and method |
| CN110496575A (en) * | 2019-07-17 | 2019-11-26 | 江苏新东风化工科技有限公司 | A kind of esterification production after-treatment system and its treatment process |
| CN111219722A (en) * | 2020-03-02 | 2020-06-02 | 广西金源生物化工实业有限公司 | A pressurization burner for low pressure waste gas |
| CN113461845B (en) * | 2020-03-30 | 2023-03-31 | 中石油吉林化工工程有限公司 | PMMA apparatus for producing |
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Address after: Changyi District of Jilin city of Jilin Province on the 132002 road at the eastern end of Lake Jilin Trade Building Patentee after: Jilin Design Institute of Northeast Refining & Chemical Engineering Co., Ltd., CNPC Address before: Changyi District of Jilin city of Jilin Province on the 132022 road at the eastern end of Lake Jilin Trade Building Patentee before: PetroChina Northeast Refining & Chemical Engineering Co., Ltd. Jilin Design Institute |
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Effective date of registration: 20190923 Address after: 132002 3-6 and 9-13 floors of Block A, Jihua Economic and Trade Center, Tongtan Road, Changyi District, Jilin Province Patentee after: PetroChina Jilin Chemical Engineering Co., Ltd. Address before: Changyi District of Jilin city of Jilin Province on the 132002 road at the eastern end of Lake Jilin Trade Building Patentee before: Jilin Design Institute of Northeast Refining & Chemical Engineering Co., Ltd., CNPC |
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