CN204803243U - Propylene dehydration combined system - Google Patents
Propylene dehydration combined system Download PDFInfo
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- CN204803243U CN204803243U CN201520369012.1U CN201520369012U CN204803243U CN 204803243 U CN204803243 U CN 204803243U CN 201520369012 U CN201520369012 U CN 201520369012U CN 204803243 U CN204803243 U CN 204803243U
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- molecular sieve
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- caustic soda
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Abstract
The utility model discloses a propylene dehydration combined system has solved traditional propylene when dehydration because the increase of water content brought for polymerization in the device raw materials of the upper reaches influence, and technical scheme is including the coalescer, solid caustic soda tower, 3A molecular sieve dehydration column and the 13X molecular sieve dehydration column that connect gradually, the bottom and the waste water jar of coalescer are connected, the bottom and the salkali waste collection tank of solid caustic soda tower are connected. Simultaneously more can saving investment than other schemes of adoption, reduce the bed and switch over inferior scalar sum regeneration frequency to reduce workman's intensity of labour, reduced the energy consumption, make manufacturing cost greatly reduced.
Description
Technical field
The present invention relates to the dewatering system of chemical industry, specifically a kind of propylene dehydration combined system.
Background technology
Current domestic polypropylene plant Raw propylene dehydration generally adopts one or both dewatering units to combine, although substantially can the smooth running of holding device when normal operation, but when water-content in upstream device raw material increase suddenly to cause in raw material propylene water-content to increase (water-content reaches about 600ppm) time, propylene is dewatered, and requirement that precision reaches polyreaction is very difficult.If when only adopting mol sieve beds, when water-content in raw material propylene increases, molecular sieve tower load increases, and within the regeneration period of design, bed can be penetrated, and water-content can not be removed to the precision that polyreaction needs, and brings very large impact to polyreaction; According to coalescer and the combination of molecular sieve tower, although most of free-water can be removed, still have a fraction of free-water and enter into molecular sieve tower, the shortening in regenerating molecular sieve cycle can be caused, thus cause the bed switching times of molecular sieve tower and the increase of regeneration frequency, because regeneration needs very large power consumption and nitrogen consumption, be unfavorable for the energy consumption and the production cost that reduce device.During according to solid caustic soda tower and the combination of molecular sieve tower, although can almost remove whole free-waters, when in propylene, water content is larger, solid caustic soda dilution is too fast, consumes a large amount of solid caustic soda, needs frequently more to renew alkali in process of production, adds labour intensity.And the waste lye not only contaminate environment produced, and deal with and need to consume steam and water.Even when the water content in propylene is too large, too fast due to solid caustic soda dilution, cause and cut that alkali lye line blocks and to arrange alkali smooth, alkali lye exceedes inlet line and is carried into downstream by propylene, makes solid caustic soda tower ineffective.Therefore, so far, when water content in raw material propylene is higher and polyreaction is higher to water-content accuracy requirement, the dehydration of propylene there is no good way process.
Summary of the invention
The object of the invention is to solve the problems of the technologies described above, providing the propylene dehydration combined system that a kind of structure is simple, volume is little, strong adaptability, dehydrating effect are good, cost of investment is low.
Technical scheme comprises the coalescer, solid caustic soda tower, 3A molecular sieve water separation tower and the 13X molecular sieve water separation tower that connect successively, and the bottom of described coalescer is connected with waste water tank, and the bottom of described solid caustic soda tower is connected with salkali waste holding tank.
Described solid caustic soda tower, 3A molecular sieve water separation tower and 13X molecular sieve water separation tower are two of serial or parallel connection.
Wire cloth filter core or fiber-like filter core is filled with in described coalescer.
For produced problem in background technology, contriver improves existing dewatering system, adopts coalescer, solid caustic soda tower, 3A molecular sieve water separation tower, 13X molecular sieve water separation tower to connect successively, and above-mentioned adjunction order is identical with technical process, can not put upside down.
The inner filling metal silk screen filter core of coalescer or fiber-like filter core are as coalescing element.Micro free water in raw material propylene emulsified with the small droplets formal distribution of disperse phase in propylene external phase, when propylene is by coalescing element, small droplets and coalescing element carry out that collision rift is captured, the large drop of coalescent formation, and finally under the action of gravity of self, from propylene external phase, sedimentation comes off.Adopt deposition dehydrating that the particle diameter of its sedimentation can not be made to be less than the free-water of 10 μm so first remove in raw material propylene with coalescer.The removal efficiency of coalescer to this kind of free-water reaches more than 99.5%.
Send into solid caustic soda tower at the raw material propylene after coalescer process, be filled with solid caustic soda in solid caustic soda tower, solid caustic soda refers to solid-state NaOH, is commonly called as sheet alkali, has strong water absorption character.Be seated in water in the solid caustic soda adsorbs propylene in solid caustic soda tower can deliquescence until become high alkali liquid and discharge at the bottom of tower.This kind of method can remove for the free-water of Large stone and small particle size, and removal efficiency almost can reach 100%, but can not remove the saturation water in propylene, is therefore specially adapted to connect after coalescer use.Outside solid caustic soda decapacitation water suction simultaneously, remove CO in addition
2and H
2the function of S, because the CO after solid caustic soda water suction in the high alkali liquid that becomes and propylene
2and H
2s reaction generates Na
2cO
3and Na
2s.
As its name suggests, in 3A molecular sieve water separation tower, be filled with 3A molecular sieve layer, in 13X molecular sieve tower, be filled with 13X molecular sieve layer.Molecular sieve is a kind of silicon aluminate crystal, vesicular structure, there is extremely strong adsorptivity, the small molecules that diameter is less than aperture can be adsorbed, the propylene molecules being greater than aperture is not then adsorbed, the molecular sieve that propylene dehydration uses mainly contains 3A molecular sieve and 13X molecular sieve, and these molecular sieves still have larger loading capacity under very low steam partial pressure, so can remove the saturation water in propylene.3A molecular sieve can make the water-content in propylene be removed to below 1ppm, and the equilibrium water adsorption amount of 13X molecular sieve is larger than 3A molecular sieve, and water-content in propylene can be made to control to below 0.1ppm.Simultaneously because the aperture ratio 3A molecular sieve bore diameter of 13X molecular sieve is large, can some impurity such as CO absorption 2, CO, alcohol, ether, so 13X mol sieve beds is placed on the final step of flow process, enter the last control of water and other impurity indexs before polyreaction as propylene.And, because 13X molecular sieve production process is complicated, price is higher, the 3A molecular sieve tower that price of connecting before 13X molecular sieve tower is more cheap, can also reduce loadings and the regeneration times of 13X molecular sieve layer, to reduce equipment volume, construction investment and production cost.
Further, described solid caustic soda tower, 3A molecular sieve water separation tower and 13X molecular sieve water separation tower are two, the mode of serial or parallel connection can connect, can select series-parallel mode according to the number of water-content in propylene during actual production between two identical towers.
The utility model system can make water-content in propylene be reduced to 0.1ppm (mass percent) below, is specially adapted to the processed of the large raw material propylene of water content.
The utility model structure is simple, easy and simple to handle, volume is little, dehydrating effect is good.
Accompanying drawing explanation
Fig. 1 is present system figure.
Wherein, 1-coalescer, 2-solid caustic soda tower, 3-3A molecular sieve water separation tower, 4-13X molecular sieve water separation tower, 5-waste water tank, 6-salkali waste holding tank.
Embodiment
Below in conjunction with accompanying drawing, explanation is further explained to the utility model:
As shown in Figure 1, coalescer 1, solid caustic soda tower 2,3A molecular sieve water separation tower 3 are connected successively with 13X molecular sieve water separation tower 4, and the bottom of described coalescer 1 is connected with waste water tank 5, and the bottom of described solid caustic soda tower 2 is connected with salkali waste holding tank 6.Coalescing element in described coalescer 1 is wire cloth filter core or fiber-like filter core, is filled with solid caustic soda in described solid caustic soda tower 2, is filled with 3A mol sieve beds in described 3A molecular sieve water separation tower 3, in 13X molecular sieve tower 4, be filled with 13X mol sieve beds.
Technical process:
Raw material propylene (water content is about 600ppm) is by after coalescer 1, isolated water is expelled to waste water tank 5 by bottom, the hypomere sending into solid caustic soda tower 2 discharged by propylene from coalescer 1 top, propylene is discharged from top after the solid caustic soda bed in solid caustic soda tower 2 processes further again, isolated waste lye is discharged and is entered salkali waste holding tank 6 bottom solid caustic soda tower 2, solid caustic soda tower 2 arranges two, and centre arranges connecting pipeline, realize two towers can connect also can be in parallel object.Water-content not high maybe need adopts single tower when changing solid caustic soda; During water-content height, two towers can serial operation.From solid caustic soda tower 2 propylene out respectively successively by 3A molecular sieve water separation tower and 13X molecular sieve water separation tower, be all bottom feed, top discharge.3A molecular sieve water separation tower and 13X molecular sieve water separation tower arrange two all as required, and centre arranges connecting pipeline, realize two towers can connect also can be in parallel object.Generally adopt single tower; When the fluctuation of upper water content is very large, two towers can serial operation.3A molecular sieve water separation tower and 13X molecular sieve water separation tower all can arrange regeneration pipeline, regularly to carry out regenerative operation.In raw material propylene after present system process water content be down to 0.1ppm (mass percent) below after enter subsequent fine technique.
Claims (3)
1. a propylene dehydration combined system, it is characterized in that, comprise the coalescer, solid caustic soda tower, 3A molecular sieve water separation tower and the 13X molecular sieve water separation tower that connect successively, the bottom of described coalescer is connected with waste water tank, and the bottom of described solid caustic soda tower is connected with salkali waste holding tank.
2. propylene dehydration combined system as claimed in claim 1, it is characterized in that, described solid caustic soda tower, 3A molecular sieve water separation tower and 13X molecular sieve water separation tower are two of serial or parallel connection.
3. propylene dehydration combined system as claimed in claim 1, is characterized in that, be filled with wire cloth filter core or fiber-like filter core in described coalescer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520369012.1U CN204803243U (en) | 2015-06-01 | 2015-06-01 | Propylene dehydration combined system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520369012.1U CN204803243U (en) | 2015-06-01 | 2015-06-01 | Propylene dehydration combined system |
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| Publication Number | Publication Date |
|---|---|
| CN204803243U true CN204803243U (en) | 2015-11-25 |
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| CN201520369012.1U Active CN204803243U (en) | 2015-06-01 | 2015-06-01 | Propylene dehydration combined system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105688615A (en) * | 2016-04-05 | 2016-06-22 | 华东理工大学 | Method and device for deep dehydration for combined type propylene |
-
2015
- 2015-06-01 CN CN201520369012.1U patent/CN204803243U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105688615A (en) * | 2016-04-05 | 2016-06-22 | 华东理工大学 | Method and device for deep dehydration for combined type propylene |
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