CN103845966A - High-temperature chloroethylene gas purification and oil removal process - Google Patents
High-temperature chloroethylene gas purification and oil removal process Download PDFInfo
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- CN103845966A CN103845966A CN201410055306.7A CN201410055306A CN103845966A CN 103845966 A CN103845966 A CN 103845966A CN 201410055306 A CN201410055306 A CN 201410055306A CN 103845966 A CN103845966 A CN 103845966A
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Abstract
The invention relates to a high-temperature chloroethylene gas purification and oil removal process. The process comprises the following steps: performing water washing, alkaline washing, compression and rectification processes on crude chloroethylene gas from a synthesis section, wherein a chloroethylene oil removal device is arranged after the compression process, and high-temperature chloroethylene gas from the outlet of the compression process enters the chloroethylene oil removal device to be treated and then enters the rectification processes. Finally, the oil content in the high-temperature chloroethylene gas subjected to the compression process is reduced to be 0.1ppm or below, so that the problem that the quality of a polyvinyl chloride product is influenced due to the oil content in the chloroethylene gas in polyvinyl chloride production for a long time is solved. In addition, because only the chloroethylene oil removal device is increased in the original process, the process has the advantages of small amount of increased equipment, low investment, easiness in implementation and simple and reasonable process, and the aims of environment friendliness and safety production can be achieved. The process can be widely applied to a polyvinyl chloride production process, particularly a high-temperature chloroethylene gas purification and oil removal process.
Description
Technical field
The present invention relates to a kind of method of gas oil removing, be particularly applicable to high-temperature chlorine ethylene gas and purify oil removing process.
Background technology
Current production of vinyl chloride by calcium carbide method industry, production capacity is seriously superfluous, utilization of capacity less than 55%, resin price is always in low level operation, and product price is hung upside down, and enterprise's pressure is very large.Under current environment, only improve the quality of products, improve the stability of product, the competitiveness that improves enterprise is only the road of enterprise development, existence.
Thick vinyl chloride gas will be by being condensed into liquid, then improve the quality of products by rectifier unit.In order to save cold, reduce costs, improving vinyl chloride gas pressure is an important procedure before rectifier unit.The compressor that in industry, vinyl chloride compression adopts is mostly helical-lobe compressor, this stable equipment operation, maintenance rate is lower, safety coefficient is high, but have the following disadvantages: the one,, in compressor bank, olein separator can only be controlled at vinyl chloride gas oil content 3ppm left and right, and VCM oil-containing decomposes in polymerization process, and the dispersion to vinyl chloride resin, transparency, color, ageing resistance have a certain impact; The 2nd,, compressor outlet gas band oil mass is many, and oil-containing in the heat transmission equipment waste discharge of follow-up system, to environment; The 3rd,, vinyl chloride compressor outlet gas is 80 ~ 95 DEG C of temperature, the high temperature of pressure 0.54 ~ 0.60MPa, gases at high pressure, in gas, oil-containing is difficult for removing, and has inflammable and explosive potential safety hazard.In order to improve the quality of products, protection of the environment, safety in production, improve the competitiveness of enterprise, VCM oil removing is the difficult problem that needs are captured.
Summary of the invention
Thereby the invention solves in current vinyl chloride resin industry due to vinyl chloride gas oil-containing affect product quality, to problems such as environments, thereby provide one not only can remove oil content in vinyl chloride gas, and technique is simple, easy to operate, the high-temperature chlorine ethylene gas of less investment, instant effect purifies oil removing process.
The technical solution used in the present invention is: high-temperature chlorine ethylene gas of the present invention purifies oil removing process, from the thick vinyl chloride gas of synthesizing section, successively after washing, alkali cleaning, compression, rectification working process, enters polymerization workshop section; Vinyl chloride oil expeller is set after compression section, from the high-temperature chlorine ethylene gas of compression section outlet, enters after vinyl chloride oil expeller is processed and enter rectification working process.
Described high-temperature chlorine ethylene gas purifies oil removing process, and its vinyl chloride gas oil expeller comprises the cylindrical shell of a sealing, and cylindrical shell upper end is provided with upper cover, and upper cover top is provided with gaseous phase outlet pipe, in upper cover, is provided with baffle plate I with cylindrical shell junction; In cylindrical shell, bottom is provided with gaseous phase outlet pipe, and gaseous phase outlet pipe one end is positioned at cylindrical shell lateral surface, and the other end is positioned in the gripper shoe that is arranged on cylindrical shell medial surface; Cylindrical shell lower end is provided with low head, and the outer junction of low head and cylindrical shell is provided with discharge port, and in low head, bottom is provided with baffle plate II, and low head bottom is provided with sewage draining exit; Between baffle plate I and baffle plate II, be provided with adsorbent.
Described high-temperature chlorine ethylene gas purifies oil removing process, in its vinyl chloride gas oil expeller gaseous phase outlet pipe, is provided with filter.Adopt this structure to be conducive to further process gaseous phase outlet gas, improve oil removal efficiency.
Described high-temperature chlorine ethylene gas purifies oil removing process, and in its vinyl chloride gas oil expeller cylindrical shell, gas phase inlet tube is provided with multiple holes, and gas phase inlet tube arranged outside has steel wire, and steel wire is wrapped in gas phase inlet tube.Adopt this structure to be conducive to vinyl chloride gas to be uniformly distributed, making increases contact area between vinyl chloride gas and adsorbent, is conducive to improve oil removal rate.Degradation problem under the oil removal rate that this structure has been avoided being caused by adsorbent obstruction gas phase air inlet pipe.The grid order of steel wire is several to be selected according to actual conditions.
Described high-temperature chlorine ethylene gas purifies oil removing process, the downward-sloping setting of its vinyl chloride gas oil expeller discharge port, and 45 ° ~ 60 ° of angles between cylindrical shell.Adopt this structure to be convenient to discharging operation.
Described high-temperature chlorine ethylene gas purifies oil removing process, and vinyl chloride oil expeller is at least two.One opens one for subsequent usely, and the equipment after switching carries out pressure release, displacement, by observing degree of saturation, the coal ash deposition rate of adsorbent, and optionally removable parts or all adsorbent.
Described high-temperature chlorine ethylene gas purifies oil removing process, the control of this process using DCS system.Be conducive to accurate operation, reduce labour intensity, easy to control.
Described high-temperature chlorine ethylene gas purifies oil removing process, and after oil removing, VCM oil-containing reaches below 0.1ppm.
Beneficial effect of the present invention: the present invention, by set up vinyl chloride gas oil expeller after original compression section, makes oil-containing in vinyl chloride gas reduce on the one hand, has reached the object of improving the quality of products; When removing on the other hand in vinyl chloride gas oil, reach the object of environmental protection and safety in production.The present invention finally can make oil-containing in the high-temperature chlorine ethylene gas after compression section be down to below 0.1ppm, affects the problem of polyvinyl chloride product quality thereby solved vinyl chloride gas oil-containing in Production of PVC for a long time.In addition due to owing to only having increased vinyl chloride oil expeller in original technique, have advantages of that the equipment of increase is few, it is little to invest, implemented and technique advantages of simple, can reach the object of environmental protection and safety in production.The present invention can be widely used in Production of PVC technique, and particularly high-temperature chlorine ethylene gas purifies in oil removing process.
Brief description of the drawings
Fig. 1 is the process chart of the embodiment of the present invention;
Fig. 2 is the structural representation of degreasing unit in Fig. 1;
In Fig. 1-2: 1 is that vinyl chloride oil expeller I, 2 is that vinyl chloride oil expeller II, 3 is that gaseous phase outlet pipe, 4 is that filter, 5 is that baffle plate I, 6 is that upper cover, 7 is that cylindrical shell, 8 is that adsorbent, 9 is that gripper shoe, 10 is that discharge port, 11 is that baffle plate II, 12 is that sewage draining exit, 13 is that low head, 14 is gas phase inlet tube.
Detailed description of the invention:
In accompanying drawing 1, high-temperature chlorine ethylene gas of the present invention purifies oil removing process, from the thick vinyl chloride gas of synthesizing section, successively after washing, alkali cleaning, compression, rectification working process, enter polymerization workshop section, it is characterized in that: vinyl chloride oil expeller is set after compression section, from the high-temperature chlorine ethylene gas of compression section outlet, enter after vinyl chloride oil expeller is processed and enter rectification working process.
Another embodiment difference is that above-mentioned vinyl chloride gas oil expeller comprises the cylindrical shell of a sealing, and cylindrical shell upper end is provided with upper cover, and upper cover top is provided with gaseous phase outlet pipe, in upper cover, is provided with baffle plate I with cylindrical shell junction; In cylindrical shell, bottom is provided with gaseous phase outlet pipe, and gaseous phase outlet pipe one end is positioned at cylindrical shell lateral surface, and the other end is positioned in the gripper shoe that is arranged on cylindrical shell medial surface; Cylindrical shell lower end is provided with low head, and the outer junction of low head and cylindrical shell is provided with discharge port, and in low head, bottom is provided with baffle plate II, and low head bottom is provided with sewage draining exit; Between baffle plate I and baffle plate II, be provided with adsorbent.
Another embodiment difference is to be provided with filter in above-mentioned vinyl chloride gas oil expeller gaseous phase outlet pipe.
Another embodiment difference is that in above-mentioned vinyl chloride gas oil expeller cylindrical shell, gas phase inlet tube is provided with multiple holes, and gas phase inlet tube arranged outside has steel wire, and steel wire is wrapped in gas phase inlet tube.
Another embodiment difference is the downward-sloping setting of above-mentioned vinyl chloride gas oil expeller discharge port, and 45 ° of angles between cylindrical shell.
Another embodiment difference is the downward-sloping setting of above-mentioned vinyl chloride gas oil expeller discharge port, and 60 ° of angles between cylindrical shell.
Another embodiment difference is that vinyl chloride oil expeller is two.
Another embodiment difference is that vinyl chloride oil expeller is three.
Another embodiment difference is the control of this process using DCS system.
Another embodiment difference is after oil removing, and VCM oil-containing reaches 0.1ppm.
Another embodiment difference is after oil removing, and VCM oil-containing reaches 0.08ppm.
Another embodiment difference is after oil removing, and VCM oil-containing reaches 0.05ppm.
Claims (8)
1. a high-temperature chlorine ethylene gas purifies oil removing process, from the thick vinyl chloride gas of synthesizing section, successively after washing, alkali cleaning, compression, rectification working process, enter polymerization workshop section, it is characterized in that: vinyl chloride oil expeller is set after compression section, from the high-temperature chlorine ethylene gas of compression section outlet, enter after vinyl chloride oil expeller is processed and enter rectification working process.
2. high-temperature chlorine ethylene gas according to claim 1 purifies oil removing process, it is characterized in that: vinyl chloride gas oil expeller comprises the cylindrical shell of a sealing, cylindrical shell upper end is provided with upper cover, and upper cover top is provided with gaseous phase outlet pipe, in upper cover, is provided with baffle plate I with cylindrical shell junction; In cylindrical shell, bottom is provided with gaseous phase outlet pipe, and gaseous phase outlet pipe one end is positioned at cylindrical shell lateral surface, and the other end is positioned in the gripper shoe that is arranged on cylindrical shell medial surface; Cylindrical shell lower end is provided with low head, and the outer junction of low head and cylindrical shell is provided with discharge port, and in low head, bottom is provided with baffle plate II, and low head bottom is provided with sewage draining exit; Between baffle plate I and baffle plate II, be provided with adsorbent.
3. high-temperature chlorine ethylene gas according to claim 2 purifies oil removing process, it is characterized in that: in above-mentioned vinyl chloride gas oil expeller gaseous phase outlet pipe, be provided with filter.
4. high-temperature chlorine ethylene gas according to claim 3 purifies oil removing process, it is characterized in that: in above-mentioned vinyl chloride gas oil expeller cylindrical shell, gas phase inlet tube is provided with multiple holes, gas phase inlet tube arranged outside has steel wire, and steel wire is wrapped in gas phase inlet tube.
5. high-temperature chlorine ethylene gas according to claim 4 purifies oil removing process, it is characterized in that: the downward-sloping setting of above-mentioned vinyl chloride gas oil expeller discharge port, and 45 ° ~ 60 ° of angles between cylindrical shell.
6. high-temperature chlorine ethylene gas according to claim 1 purifies oil removing process, it is characterized in that: vinyl chloride oil expeller is at least two.
7. high-temperature chlorine ethylene gas according to claim 1 purifies oil removing process, it is characterized in that: the control of this process using DCS system.
8. purify oil removing process according to the high-temperature chlorine ethylene gas described in claim 1-7, it is characterized in that: after oil removing, VCM oil-containing reaches below 0.1ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410055306.7A CN103845966A (en) | 2014-02-19 | 2014-02-19 | High-temperature chloroethylene gas purification and oil removal process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410055306.7A CN103845966A (en) | 2014-02-19 | 2014-02-19 | High-temperature chloroethylene gas purification and oil removal process |
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| CN103845966A true CN103845966A (en) | 2014-06-11 |
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| CN201410055306.7A Pending CN103845966A (en) | 2014-02-19 | 2014-02-19 | High-temperature chloroethylene gas purification and oil removal process |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3691239A (en) * | 1969-05-05 | 1972-09-12 | Continental Oil Co | Process for purification of ethylene dichloride |
| US3807138A (en) * | 1972-04-24 | 1974-04-30 | Gaf Corp | Recovery and purification of vinyl chloride venting from pvc reactors |
| CN1778453A (en) * | 2004-11-24 | 2006-05-31 | 黄立维 | Removal of gasified harmful substance from airflow |
| CN203355562U (en) * | 2013-05-16 | 2013-12-25 | 浙江保尔力胶带有限公司 | Layered absorption tank |
-
2014
- 2014-02-19 CN CN201410055306.7A patent/CN103845966A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3691239A (en) * | 1969-05-05 | 1972-09-12 | Continental Oil Co | Process for purification of ethylene dichloride |
| US3807138A (en) * | 1972-04-24 | 1974-04-30 | Gaf Corp | Recovery and purification of vinyl chloride venting from pvc reactors |
| CN1778453A (en) * | 2004-11-24 | 2006-05-31 | 黄立维 | Removal of gasified harmful substance from airflow |
| CN203355562U (en) * | 2013-05-16 | 2013-12-25 | 浙江保尔力胶带有限公司 | Layered absorption tank |
Non-Patent Citations (2)
| Title |
|---|
| 郑石子等: "《聚氯乙烯生产与操作》", 31 January 2008, article "第24章 粗氯乙烯净化和压缩部分", pages: 266 * |
| 郑石子等: "《聚氯乙烯生产与操作》", 31 January 2008, 化学工业出版社 * |
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Application publication date: 20140611 |