CN113831209B - System for reducing generation of fine powder of polypropylene device - Google Patents
System for reducing generation of fine powder of polypropylene device Download PDFInfo
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- CN113831209B CN113831209B CN202111272295.4A CN202111272295A CN113831209B CN 113831209 B CN113831209 B CN 113831209B CN 202111272295 A CN202111272295 A CN 202111272295A CN 113831209 B CN113831209 B CN 113831209B
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- propylene
- water content
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- water
- reverse osmosis
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- -1 polypropylene Polymers 0.000 title claims abstract description 14
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 11
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 11
- 239000000843 powder Substances 0.000 title abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 119
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims abstract description 100
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims abstract description 100
- 238000006243 chemical reaction Methods 0.000 claims abstract description 36
- 239000002994 raw material Substances 0.000 claims abstract description 30
- 238000007670 refining Methods 0.000 claims abstract description 12
- 239000000178 monomer Substances 0.000 claims abstract description 4
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 4
- 238000001223 reverse osmosis Methods 0.000 claims description 31
- 238000002347 injection Methods 0.000 claims description 28
- 239000007924 injection Substances 0.000 claims description 28
- 230000001105 regulatory effect Effects 0.000 claims description 26
- 239000012528 membrane Substances 0.000 claims description 22
- 229910052785 arsenic Inorganic materials 0.000 claims description 20
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims description 20
- 230000018044 dehydration Effects 0.000 claims description 20
- 238000006297 dehydration reaction Methods 0.000 claims description 20
- 230000003009 desulfurizing effect Effects 0.000 claims description 9
- 238000006477 desulfuration reaction Methods 0.000 claims description 7
- 230000023556 desulfurization Effects 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 11
- 239000003054 catalyst Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000012429 reaction media Substances 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/144—Purification; Separation; Use of additives using membranes, e.g. selective permeation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Water Supply & Treatment (AREA)
- Water Treatment By Sorption (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a system for reducing generation of fine powder of a polypropylene device. Comprises a propylene refining unit, a reaction unit for carrying out polymerization reaction on propylene monomers, and a raw material propylene water content control unit for controlling the water content of raw material propylene to be fed into the reaction unit, which are sequentially arranged. The water content of the raw material propylene entering the reaction device is controlled to be 20-25ppm, so that the fine powder generated in the reaction device is obviously reduced, the waste collection tank almost contains no fine powder, the catalyst adding condition of the reaction device is not changed, and the unit consumption and the reaction load are not obviously changed.
Description
Technical Field
The invention belongs to the technical field of polypropylene production, and particularly relates to a system for reducing generation of fine powder of a polypropylene device.
Background
In the polypropylene production process, raw material propylene is firstly sent to a propylene refining unit for dehydration, desulfurization, dearsenification and other treatments, then enters a reaction unit, and then the obtained polymer is subjected to steps of flash evaporation separation, vapor drying, extrusion granulation and the like, so that finished polypropylene particles are finally obtained, wherein the main purpose of the flash evaporation separation is to separate propylene remained on the polymer. After entering the reaction device, partial polymer fine powder is inevitably generated in the reaction process due to the influence of granularity of the catalyst, impurity content of the reaction medium and actual reaction operation conditions, and is carried into a subsequent working section. When a large amount of polymer fine powder is brought into the flash separation device, the propylene washing tower and a small flash pipeline between the propylene washing tower and a bag filter are blocked, so that a system is paralyzed, and the stable operation of the device is seriously affected. And for the device that has the desicator to carry out the steaming drying, the powder that filters through the bag filter is carried out by steam, nitrogen gas, after entering the scrubbing tower, subsides, then overflow to the waste collection pond, when the production volume of polymer fine powder is great, the fine powder washing effect of steaming drying unit can be worsened, cause the powder content in the nitrogen gas more, the mist separator frequently blocks up, and the fan that probably gets into the desicator causes fan interlocking or trouble, in addition, also can gather a large amount of products in the waste collection pond, make the product become the waste product, cause certain economic loss, the intensity of labour of also increasing the operating personnel of collecting the fine powder still causes great pollution to the surrounding environment, be unfavorable for the safe and stable operation of device, also be unfavorable for energy saving and emission reduction.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a system for reducing the generation of fine powder of a polypropylene device.
A system for reducing the generation of fine powder of a polypropylene device comprises a propylene refining unit, a reaction unit for carrying out polymerization reaction on propylene monomers, and a raw propylene water content control unit for controlling the water content of raw propylene to be fed into the reaction unit, which are sequentially arranged.
Further, the propylene refining unit comprises a first dehydration tower, a light component removal tower for removing CO 2、CO、O2, a first desulfurization tower, a second dehydration tower and a first arsenic removal tower which are connected in sequence through pipelines.
Further, the raw material propylene water content control unit controls the water content of the raw material propylene to be fed into the reaction unit to 20 to 25ppm.
Further, the raw material propylene water content control unit comprises a second desulfurizing tower, a second dearsenifying tower, a second water content analyzer, a propylene mass flowmeter and a propylene flow regulating valve which are connected in sequence in a pipeline manner; the second desulfurizing tower is connected with the first dehydrating tower in parallel; after the outlet pipeline of the propylene flow regulating valve is converged with the pipeline after the first arsenic removal tower, the propylene flow regulating valve is connected to a reaction unit through a pipeline provided with a first water content analyzer; the device also comprises a water injection control device, an outlet of the water injection control device is connected between the second arsenic removal tower and the second water content analyzer, and an inlet of the water injection control device is connected with a water adding pipeline.
Further, a propylene filter is connected with the rear part of the first arsenic removal tower through a pipeline; the outlet pipe of the propylene flow regulating valve is connected with the outlet pipe of the propylene filter and then connected with the reaction unit.
Further, the raw material propylene water content control unit also comprises a mixer, the second dearsenifying tower and the water injection control device are connected at the inlet of the mixer, and the outlet of the mixer is connected with the propylene mass flowmeter.
Further, the mixer is a static mixer.
Further, the water injection control device comprises a water injection regulating valve and a reverse osmosis device provided with a reverse osmosis membrane, and an outlet of the reverse osmosis device is connected between the second arsenic removal tower and the second water content analyzer; the pressure of water is higher than that of propylene, in particular, 0.1-0.5MPa.
Further, the reverse osmosis device is provided with two sets of freely switchable reverse osmosis membranes with different water yields, wherein the front of one set of reverse osmosis membrane is provided with a regulating valve, the water yield of one set of reverse osmosis membrane enables the propylene water content between the second dearsenification tower and the second water content analyzer to be below 10ppm, and the water yield of the other set of reverse osmosis membrane enables the propylene water content between the second dearsenification tower and the second water content analyzer to be 10-30ppm.
Further, through setting up respectively and establishing a governing valve before two sets of reverse osmosis membranes, the condition of using of control reverse osmosis membrane.
In actual production application, if the water content obtained by the first water content analyzer is higher than 25ppm, closing a water injection regulating valve of the water injection control device, reducing the opening of a propylene flow regulating valve through PID control of a propylene mass flowmeter, thereby improving dehydration efficiency, analyzing whether the water content meets 20-25ppm by the first water content analyzer, correspondingly adjusting a set value of the propylene mass flowmeter, and finally enabling the water content obtained by the first water content analyzer to meet 20-25ppm. If the water content obtained by the first water content analyzer is lower than 20ppm, the water content needs to be increased, and at this time, the water content can be analyzed by the second water content analyzer on the one hand, and the amount of water needed to be added can be determined by combining the flow obtained by the propylene mass flowmeter.
Compared with the prior art, the invention has the beneficial effects that: the water content of raw material propylene entering the reaction device is controlled to be 20-25ppm, so that the fine powder generated in the reaction device is obviously reduced, the waste collection tank almost contains no fine powder, the catalyst adding condition of the reaction device is not changed, and the unit consumption and the reaction load are not obviously changed; by arranging two sets of freely switchable reverse osmosis membranes with different water yields, the water injection quantity of the water injection control device is controlled more accurately.
Drawings
Fig. 1: the system for reducing the generation of fines in a polypropylene unit described in example 1.
Fig. 2: a system for reducing the generation of fines in a polypropylene unit as described in example 2.
Fig. 3: schematic of the apparatus described in comparative example 1.
In the figure: 1. the system comprises a first dehydration tower, a second dehydration tower, a desulfurizing tower, a first arsenic removal tower, a propylene filter, a first water content analyzer, a third dehydration tower, a second arsenic removal tower, a water injection control device, a mixer, a water content analyzer, a propylene mass flowmeter, a propylene flow regulating valve and a propylene flow regulating valve.
Detailed Description
The present invention is explained by way of illustration, but not limitation, and the technical solutions obtained under the teaching of the inventive concept should be included in the protection scope of the present patent.
The invention discloses a system for reducing the generation of fine powder of a polypropylene device, which comprises a propylene refining unit, a reaction unit for carrying out polymerization reaction on propylene monomers, and a raw material propylene water content control unit for controlling the water content of raw material propylene to be fed into the reaction unit, wherein the propylene refining unit and the reaction unit are sequentially arranged.
Example 1
In this embodiment, as shown in fig. 1, the propylene refining unit includes a first dehydration tower 1, a light component removal tower 2 for removing CO 2、CO、O2, a first desulfurization tower 3, a second dehydration tower 4, and a first dearsenification tower 5, which are connected in series by pipelines.
Further, the raw material propylene water content control unit controls the water content of the raw material propylene to be fed into the reaction unit to 20 to 25ppm.
Further, the raw material propylene water content control unit comprises a second desulfurizing tower 8, a second dearsenifying tower 9, a second water content analyzer 11, a propylene mass flowmeter 12 and a propylene flow regulating valve 13 which are connected in sequence in a pipeline manner; the second desulfurizing tower 8 is connected with the first dehydrating tower 1 in parallel; after the outlet pipeline of the propylene flow regulating valve 13 is converged with the pipeline after the first arsenic removal tower 5, the propylene flow regulating valve is connected to a reaction unit through a pipeline provided with a first water content analyzer 7; the device also comprises a water injection control device 10.1, wherein an outlet of the water injection control device 10.1 is connected between the second arsenic removal tower 9 and the second water content analyzer 11, and an inlet of the water injection control device 10.1 is connected with a water adding pipeline.
Further, a propylene filter 6 is also connected with the rear of the first arsenic removal tower 5 in a pipeline manner; the outlet pipe of the propylene flow rate regulating valve 13 joins the outlet pipe of the propylene filter 6 and is connected to the reaction unit.
Further, the raw material propylene water content control unit also comprises a mixer 10.2, the second dearsenifying tower 9 and the water injection control device 10.1 are connected at the inlet of the mixer 10.2, and the outlet of the mixer 10.2 is connected to a propylene mass flowmeter 12.
Further, the mixer 10.2 is a static mixer. In fact, dynamic mixers, such as buffer tanks with stirring, etc. can also be used.
Further, the water injection control device 10.1 comprises a water injection regulating valve and a reverse osmosis device provided with a reverse osmosis membrane, and an outlet of the reverse osmosis device is connected between the second dearsenifying tower 9 and the second water content analyzer 11; the pressure of the water is higher than the pressure of the raw propylene.
Further, the reverse osmosis device is provided with two sets of freely switchable reverse osmosis membranes with different water yields, wherein the front of one set of reverse osmosis membrane is provided with a regulating valve, the water yield of the one set of reverse osmosis membrane enables the propylene water content between the second dearsenification tower 9 and the second water content analyzer 11 to be below 10ppm, and the water yield of the other set of reverse osmosis membrane enables the propylene water content between the second dearsenification tower 9 and the second water content analyzer 11 to be 10-30ppm.
Further, through setting up respectively and establishing a governing valve before two sets of reverse osmosis membranes, the condition of using of control reverse osmosis membrane.
Example 2
In this embodiment, as shown in fig. 2, the propylene refining unit includes a first dehydration tower 1, a light component removal tower 2 for removing CO 2、CO、O2, a first desulfurization tower 3, a second dehydration tower 4, and a first dearsenification tower 5, which are connected in series by pipelines.
Further, the raw material propylene water content control unit controls the water content of the raw material propylene to be fed into the reaction unit to 20 to 25ppm.
Further, the raw material propylene water content control unit comprises a second desulfurizing tower 8, a second dearsenifying tower 9, a second water content analyzer 11, a propylene mass flowmeter 12 and a propylene flow regulating valve 13 which are connected in sequence in a pipeline manner; the second desulfurizing tower 8 is connected with the first dehydrating tower 1 in parallel; after the outlet pipeline of the propylene flow regulating valve 13 is converged with the pipeline after the first arsenic removal tower 5, the propylene flow regulating valve is connected to a reaction unit through a pipeline provided with a first water content analyzer 7; the device also comprises a water injection control device 10.1, wherein an outlet of the water injection control device 10.1 is connected between the second arsenic removal tower 9 and the second water content analyzer 11, and an inlet of the water injection control device 10.1 is connected with a water adding pipeline. The water injection control device 10.1 in this embodiment may be a control valve with high control sensitivity or a combination of a metering pump and a control valve.
It can be seen that the difference between this embodiment and the first embodiment is that the common water injection control device 10.1 is used, and the first embodiment is slightly inferior in terms of control sensitivity, but the core scheme is not changed, so that the purpose of controlling the powder product wasted in the waste collection tank can be still achieved.
Comparative example 1
In this comparative example, as shown in fig. 3, the propylene refining unit comprises a first dehydration tower 1, a light component removal tower 2 for removing CO 2、CO、O2, a first desulfurization tower 3, a second dehydration tower 4, a first dearsenification tower 5, a propylene filter 6, and a raw material-free propylene water content control unit, which are connected in sequence through pipelines.
Raw material propylene is dehydrated through a first dehydration tower 1 connected with a pipeline in sequence, light components such as CO 2、CO、O2 and the like are removed through a pipeline connection light component removal tower 2, sulfur components are removed through a first desulfurization tower 3, a second dehydration tower 4 is dehydrated, arsenic components are removed through a first arsenic removal tower 5 in sequence, and refined propylene enters a reaction unit after impurity removal through a propylene filter 6. The dehydration effect depends on the dehydration effect of the dehydration tower, the water content in the raw material propylene is determined, and the water content in the raw material propylene cannot be accurately controlled.
Through practical comparison, when the system provided by the embodiment is not used for further controlling the water content of raw propylene, when the feeding amount of the raw propylene is 19.5t/h and the water content is below 20ppm through normal refining process treatment, the waste collection tank needs to be cleaned 60 times per month, and about 16 bags of powder can be cleaned by cleaning the waste collection tank each time, and about 20kg of waste per bag is obtained, so that the powder wasted per month is 19.2t, and the labor cost and the time cost for cleaning the powder are very high. By using the system provided in the embodiment 1 and the embodiment 2, when the water content of the raw materials is controlled to be 20-25ppm, the waste collection tank is cleaned 10 times per month, only 1.5-2 bags are used each time, and the waste powder can be saved by 18.8-18.9t per month. And correspondingly, the unit consumption of the catalyst is increased by about 0.0005kg/t, and the increment is very small. Table 1 shows the effects of the embodiments of example 1, example 2, and comparative example 3.
Table 1 effects of implementation of the technical scheme
When the water content of the raw material is above 25ppm, the practice shows that the catalyst in the reaction system is extremely easy to poison, the reaction load is unstable, the production safety problem is easy to cause, and when the water content of the raw material propylene is controlled to be 20-25ppm, the load of the reaction unit is stable, and the device runs stably.
Through the system that this embodiment provided, can reduce pipeline, heat exchanger, equipment because of the possibility that the powder was blockked up, reduce and examine maintenance work load, reduced a large amount of manual labor volume, prolonged the life and the online life of equipment, still promoted economic benefits, improved device surrounding environment, do benefit to energy saving and emission reduction.
Claims (3)
1. A system for reducing the generation of fines in a polypropylene unit, comprising: comprises a propylene refining unit, a reaction unit for carrying out polymerization reaction on propylene monomers, and a raw material propylene water content control unit for controlling the water content of raw material propylene to be fed into the reaction unit, which are sequentially arranged;
The raw material propylene water content control unit controls the water content of the raw material propylene to be fed into the reaction unit to be 20-25ppm;
The raw material propylene water content control unit comprises a second desulfurizing tower (8), a second dearsenifying tower (9), a second water content analyzer (11), a propylene mass flowmeter (12) and a propylene flow regulating valve (13) which are connected in sequence in a pipeline manner; the second desulfurizing tower (8) is connected with the first dehydrating tower (1) in parallel; after the outlet pipeline of the propylene flow regulating valve (13) is converged with the pipeline behind the first arsenic removal tower (5), the propylene flow regulating valve is connected to a reaction unit through a pipeline provided with a first water content analyzer (7); the device also comprises a water injection control device (10.1), wherein an outlet of the water injection control device (10.1) is connected between the second arsenic removal tower (9) and the second water content analyzer (11), and an inlet of the water injection control device (10.1) is connected with a water adding pipeline;
a propylene filter (6) is also connected with the back of the first arsenic removal tower (5) through a pipeline; the outlet pipeline of the propylene flow regulating valve (13) is connected with the outlet pipeline of the propylene filter (6) and then connected with the reaction unit;
the raw material propylene water content control unit also comprises a mixer (10.2), the second arsenic removal tower (9) and the water injection control device (10.1) are connected with the inlet of the mixer (10.2), and the outlet of the mixer (10.2) is connected with a propylene mass flowmeter (12);
the mixer (10.2) is a static mixer;
The water injection control device (10.1) comprises a water injection regulating valve and a reverse osmosis device provided with a reverse osmosis membrane, and an outlet of the reverse osmosis device is connected between the second arsenic removal tower (9) and the second water content analyzer (11); the pressure of water is higher than that of raw propylene;
The reverse osmosis device is provided with two sets of freely switchable reverse osmosis membranes with different water yields, wherein the front of one set of reverse osmosis membrane is provided with a regulating valve, the water yield of the one set of reverse osmosis membrane enables the propylene water content between the second dearsenification tower (9) and the second water content analyzer (11) to be below 10ppm, and the water yield of the other set of reverse osmosis membrane enables the propylene water content between the second dearsenification tower (9) and the second water content analyzer (11) to be 10-30ppm.
2. A system for reducing the generation of fines in a polypropylene plant as defined in claim 1 wherein: the propylene refining unit comprises a first dehydration tower (1), a light component removal tower (2) for removing CO 2、CO、O2, a first desulfurization tower (3), a second dehydration tower (4) and a first arsenic removal tower (5) which are connected in sequence through pipelines.
3. A system for reducing the production of propylene plant fines as defined in claim 1, wherein: the use of the reverse osmosis membranes is controlled by arranging one regulating valve in front of the two reverse osmosis membranes.
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| CN202111272295.4A CN113831209B (en) | 2021-10-29 | 2021-10-29 | System for reducing generation of fine powder of polypropylene device |
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| CN202111272295.4A CN113831209B (en) | 2021-10-29 | 2021-10-29 | System for reducing generation of fine powder of polypropylene device |
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