CN112497555A - Device and method for preparing high-quality polypropylene product - Google Patents
Device and method for preparing high-quality polypropylene product Download PDFInfo
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- CN112497555A CN112497555A CN202011132434.9A CN202011132434A CN112497555A CN 112497555 A CN112497555 A CN 112497555A CN 202011132434 A CN202011132434 A CN 202011132434A CN 112497555 A CN112497555 A CN 112497555A
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 223
- -1 polypropylene Polymers 0.000 title claims abstract description 223
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 223
- 238000000034 method Methods 0.000 title claims abstract description 49
- 239000000843 powder Substances 0.000 claims abstract description 256
- 238000007872 degassing Methods 0.000 claims abstract description 90
- 239000007789 gas Substances 0.000 claims abstract description 64
- 238000010438 heat treatment Methods 0.000 claims abstract description 41
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 238000011282 treatment Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000005469 granulation Methods 0.000 claims description 3
- 230000003179 granulation Effects 0.000 claims description 3
- 230000003197 catalytic effect Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- 238000013019 agitation Methods 0.000 claims 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 24
- 229910052717 sulfur Inorganic materials 0.000 abstract description 24
- 239000011593 sulfur Substances 0.000 abstract description 24
- 239000012535 impurity Substances 0.000 abstract description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 abstract description 18
- 239000001301 oxygen Substances 0.000 abstract description 18
- 239000012855 volatile organic compound Substances 0.000 description 70
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 21
- 150000001299 aldehydes Chemical class 0.000 description 21
- 150000002576 ketones Chemical class 0.000 description 21
- 239000012071 phase Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 239000002131 composite material Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 239000004594 Masterbatch (MB) Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 229940095686 granule product Drugs 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- XOCUXOWLYLLJLV-UHFFFAOYSA-N [O].[S] Chemical compound [O].[S] XOCUXOWLYLLJLV-UHFFFAOYSA-N 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011342 resin composition Substances 0.000 description 2
- 150000003464 sulfur compounds Chemical class 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000005003 food packaging material Substances 0.000 description 1
- 239000013538 functional additive Substances 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 239000012567 medical material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002159 nanocrystal Substances 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/10—Conditioning or physical treatment of the material to be shaped by grinding, e.g. by triturating; by sieving; by filtering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B2013/005—Degassing undesirable residual components, e.g. gases, unreacted monomers, from material to be moulded
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention discloses a device and a method for preparing a high-quality polypropylene product, wherein the device comprises a powder filter and a powder degassing bin, a powder processor for heating polypropylene powder is arranged between the powder filter and the powder degassing bin, the powder processor is connected with a heating medium system for supplying heat to the powder processor, and a gas-phase outlet of the powder processor is connected with a tail gas filter; the powder filter, the tail gas filter and the gas phase outlet of the powder degassing bin are communicated with a tail gas purifier for purifying the discharged tail gas. The polypropylene powder is subjected to temperature increase by a powder processor and then enters a powder degassing bin for degassing, so that VOC and oxygen-containing impurities can be removed from 2000-15000 mg/kg to 15-100 mg/kg, and the removal rate is 95.0-99.9%; the COS in the sulfur is removed from 200-1000 mu g/kg to less than 1 mu g/kg, and the removal rate is 99.5-99.9%.
Description
Technical Field
The invention relates to a device and a method for removing volatile organic compounds, in particular to a device and a method for preparing high-quality polypropylene products.
Background
Polypropylene is an important synthetic resin product, and a bulk polypropylene product includes: isotactic homopolymerization, syndiotactic homopolymerization, atactic homopolymerization, high crystallinity, metallocene, high impact copolymer, composite material, rubber resin and other varieties. In recent years, with the rapid development of packaging, electronic, automobile and other industries in China, the development of the polypropylene industry in China is greatly promoted. And because the polypropylene product has plasticity, the material thereof is gradually replacing the wooden product, and the high strength toughness and high wear resistance of the polypropylene product gradually replace the mechanical function of metal. In addition, the polypropylene product has good grafting and compounding functions, and has huge application space in the aspects of concrete, textile, packaging, agriculture, forestry, animal husbandry, assistant and fishery. At present, the process technologies for producing bulk polypropylene products include both gas phase and liquid phase processes.
In order to recover unreacted propylene raw materials at the outlet of a polymerization reactor, the polypropylene process in the prior art circularly returns the unreacted propylene raw materials to a first polymerization reactor and a second polymerization reactor in sequence after being pressurized by a compressor, and then carries out polymerization reaction to generate polypropylene powder, so that Volatile Organic Compounds (VOC) and oxygen-containing impurities such as aldehyde, ketone, alcohol and sulfur in the polypropylene powder are continuously accumulated, and the content is continuously increased. In a degassing bin, the operating temperature of the polypropylene powder is 25-80 ℃, the degassing effect is not ideal, 500-600 mg/kg of Volatile Organic Compounds (VOC) and aldehyde, ketone, alcohol and sulfur oxygen-containing impurities are still reserved in the degassed polypropylene powder, so that the extruded and granulated polypropylene granule product still contains a certain amount of Volatile Organic Compounds (VOC) and aldehyde, ketone, alcohol and sulfur oxygen-containing impurity residues, the sulfur in the residues, especially COS, is a source of smell, and the strength of the odor is more than or equal to 1, so that the quality of the polypropylene granule product is influenced.
Patent 201410563146.7 discloses a low VOC polypropylene resin composition and a preparation method thereof, the low VOC polypropylene resin composition comprises the following blended components: polypropylene, VOC inhibitors; the VOC content of the polypropylene composition is remarkably reduced by a method of compounding the VOC inhibitor and the acid absorbent, the operation process is simple, and the polypropylene composition is suitable for the fields of high-grade automotive upholsteries with higher environmental protection requirements, medical and food packaging materials and the like.
Patent 201410563148.6 discloses a VOC inhibiting masterbatch for polypropylene and a preparation method and application thereof, wherein the VOC inhibiting masterbatch for polypropylene comprises the following blended components: polypropylene, cellulose nanocrystals, fully vulcanized powdered silicone rubber; the VOC inhibiting master batch for polypropylene can effectively inhibit the generation of VOC in polypropylene materials, can make the Total Volatile Organic Compound (TVOC) content in the polypropylene materials lower than 50 mu g.C/g, and well solves the defects of the prior art. And the operation process is simple and reliable, the investment cost is low, and the application prospect is wide.
Patent 201511029388.9 discloses a VOC-reducing masterbatch for polypropylene and a preparation method and application thereof, wherein the VOC-reducing masterbatch is prepared by a novel microporous foamed polypropylene carrier, and an aqueous solution VOC remover and a surfactant which are adsorbed on the polypropylene carrier according to mass distribution. The VOC-reduced master batch has good compatibility with polypropylene resin, is completely devolatilized in vacuum without residue, does not influence the subsequent processing and performance of modified polypropylene, effectively reduces the VOC of polypropylene products, makes the polypropylene products more environment-friendly, and meets the requirements of automobile manufacturers on the VOC.
Patent 201710697173.7 discloses a low-odor and low-VOC polypropylene composite material and a preparation device and method thereof, wherein the polypropylene composite material is prepared from polypropylene resin, filler, functional additives, a processing heat stabilizer, a processing lubricant and silicone oil according to the mass part ratio of 55-97: 0-20: 0.5-20: 0.2-1: 0, l-2: 0.05-0.1, water is used as an extracting agent in the preparation process, the extracting agent is added through a water injection port arranged on an extruder, the position of a vacuum port in the extruder is improved, and the aim of removing harmful volatile organic compounds in the composite material stage by stage is finally fulfilled.
In the prior art, the invention patent application No. 201410563146.7 and the invention patent application No. 201410563148.6 and the invention patent application No. 201511029388.9 and the invention patent application No. 201710697173.7 both adopt a method of adding a plurality of additives into polypropylene to prepare a low-VOC polypropylene resin material or a low-VOC polypropylene composite material, so that the production cost of a polypropylene product is increased, the content of COS is not controlled, and the problems of high production cost, low VOC removal rate, residual COS and odor of the polypropylene product exist.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a device for preparing high-quality polypropylene products, which can reduce VOC and oxygen-containing impurities in powder;
it is another object of the present invention to provide a process for the preparation of high quality polypropylene products.
The technical scheme is as follows: the device for preparing the high-quality polypropylene product comprises a powder filter and a powder degassing bin, wherein a powder processor for heating polypropylene powder is arranged between the powder filter and the powder degassing bin, the powder processor is connected with a heating medium system for supplying heat to the powder processor and heating the polypropylene powder in a non-contact mode, and a gas phase outlet of the powder processor is connected with a tail gas filter; and gas phase outlets of the tail gas filter and the powder degassing bin are communicated with the purifier for purifying tail gas.
Preferably, the powder processor is any one of a horizontal stirring powder processor, a vertical stirring powder processor, an inclined stirring powder processor, a sleeve heater, a double-screw heater or a rotary cylinder heater.
Preferably, the outer wall of the powder processor is provided with a jacket for containing a heating medium.
The method for preparing the high-quality polypropylene product by using the device for preparing the high-quality polypropylene product comprises the following steps:
(A) the polypropylene powder discharged from the reaction system enters a powder filter for filtering;
(B) the filtered polypropylene powder enters a powder processor, a heating medium is conveyed to the powder processor through a heating medium system, the polypropylene powder is heated or dried in a non-contact mode, and then the polypropylene powder enters a tail gas filter (4) for filtering;
(C) the heated polypropylene powder enters a powder degassing bin, hot nitrogen is blown into the powder degassing bin to carry out degassing treatment on the polypropylene powder, and then a polypropylene product is prepared by an extrusion granulation process;
wherein, the exhaust tail gas generated in the processes of the steps (A) to (C) is introduced into an exhaust purifier for purification treatment.
Preferably, the polypropylene powder is heated to 90-130 ℃ from 30-80 ℃ in the powder processor (3); the degassing time of the powder degassing bin is 1.0-4.0 hours.
Preferably, the operating pressure of the tail gas filter (4) is 0.04-0.16 MPaA, and the operating temperature is 90-135 ℃; the operation pressure of the powder degassing bin (5) is 0.05-0.17 MPaA, the operation temperature is 90-135 ℃, and the residence time of the polypropylene powder (P4) in the powder degassing bin (5) is 1.0-8.0 hours.
Preferably, the operating pressure of the tail gas filter (4) is 0.05-0.15 MPaA, and the operating temperature is 95-135 ℃; the operating pressure of the powder degassing bin (5) is 0.06-0.16 MPaA, the operating temperature is 95-135 ℃, the residence time of the polypropylene powder in the powder degassing bin (5) is 1.5-8.0 hours,
preferably, the operating pressure of the tail gas filter (4) is 0.06-0.14 MPaA, and the operating temperature is 100-135 ℃; the operation pressure of the powder degassing bin (5) is 0.07-0.15 MPaA, the operation temperature is 100-135 ℃, and the residence time of the polypropylene powder (P4) in the powder degassing bin (5) is 2.0-8.0 hours.
Preferably, in the step (B), the heating medium is at least one of electricity, heat conducting oil, hot air, hot nitrogen, water vapor and hot water.
Preferably, in the step (B), the heating medium is introduced into a jacket on the outer wall of the powder processor for heating or drying the polypropylene powder in a non-contact manner.
Has the advantages that: compared with the prior art, the invention has the following remarkable effects: 1. a powder processor is added between the powder filter and the powder degassing bin, so that VOC and oxygen-containing impurities can be removed from 2000-15000 mg/kg to 15-100 mg/kg, and the removal rate is 95.0-99.9%; removing COS in the sulfur compounds from 200-1000 mu g/kg to below 1 mu g/kg, wherein the removal rate is 99.5-99.9%; 2. no additive or adsorbent needs to be additionally injected into the polypropylene product; 3. can be applied to the preparation of bulk polypropylene products of low cost, low VOC, high quality, isotactic, syndiotactic, atactic, high crystallinity, metallocene, high impact resistance, composite and rubber.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings.
Example 1
As shown in fig. 1, wherein 1 powder filter, 2 plug valves, 3 powder processors, 4 tail gas filters, 5 powder degassing bins, 6 tail gas purifiers, P1, P2, P3, P4 polypropylene powder, N1, N2 hot nitrogen, V1, V2, V3, V4, V5, V6 exhaust tail gas, H1, H2 heating media; the device for preparing the high-quality polypropylene product comprises a powder filter 1, a reaction system and a reaction system, wherein the powder filter 1 is used for filtering polypropylene powder P1 discharged from the reaction system, and the bottom of the powder filter 1 is in an inverted triangular cone shape; the outlet at the bottom of the powder filter 1 is provided with a plug valve 2, polypropylene powder P2 filtered by the powder filter 1 enters the powder processor 3 through the plug valve 2, and the powder processor 3 is horizontal or vertical. The inside and outside of the powder processor 3 are provided with isolation, the powder processor 3 is connected with a heat medium system for supplying heat to the powder processor 3, a heat medium H1 exchanges heat with polypropylene powder P3 in the powder processor 3 through the heat medium system, the heat medium H2 after heat exchange is discharged through the heat medium system, and the heat medium heats the polypropylene powder in a mode of non-direct contact with the polypropylene powder. The gas phase outlet of the powder processor 3 is arranged at the top of the powder processor 3, the gas phase outlet of the powder processor 3 is connected with a tail gas filter 4 for further filtering tail gas V2 generated after the powder processor is processed, and the gas phase outlet of the tail gas filter 4 is connected with a purifier. The material outlet of the powder processor 3 is connected with the degassing bin 5, and the polypropylene powder P4 after heat exchange enters the degassing bin 5. The tail gas filter 4 and the degassing bin 5 are respectively connected with a nitrogen pipeline for introducing hot nitrogen into the tail gas filter 4 and the degassing bin 5 for degassing, gas phase outlets of the powder filter 1, the tail gas filter 4 and the degassing bin 5 are communicated with a purifier 6 for purifying respectively generated tail gases V1, V3 and V4, the purifier removes VOC in the discharged tail gas by adopting a catalytic oxidation method, and the purified discharged tail gas V6 is discharged into the atmosphere after reaching the standard and does not pollute the environment. And (3) sending the degassed polypropylene powder P5 to a downstream extrusion granulation section to obtain a polypropylene product.
The device adopts a gas phase method polypropylene process technology, the polypropylene device is a polypropylene pilot plant, the minimum nominal production capacity can reach 2 ten thousand tons/year, the polypropylene device is a large-scale commercial industrial device of polypropylene, 1-4 production lines can be adopted, the maximum nominal production capacity of each production line can reach 45 ten thousand tons/year, and the maximum nominal production capacity of the polypropylene industrial device can reach 180 ten thousand tons/year.
The nominal production capacity of the embodiment is 20 ten thousand tons/year, the single-line operation is realized, and the specific method for preparing the high-quality polypropylene product comprises the following steps:
(1) polypropylene powder P1 discharged from the reaction system enters a powder filter 1, the operating pressure of the powder filter 1 is 0.15MPaA, and the operating temperature is 44 ℃; discharging the polypropylene powder from the bottom of the filter, and discharging tail gas V1 from the upper part to the purifier 6, wherein the content of Volatile Organic Compounds (VOC), aldehyde, ketone and alcohol oxygen-containing impurities in the polypropylene powder is 4760 mg/kg;
| name (R) | Polypropylene | VOC | Aldehydes | Ketones | Alcohol(s) | Sulfur | COS |
| Data of | 100.0 | 4500 | 40 | 40 | 80 | 100 | 300 |
| Unit of | mol％ | mg/kg | mg/kg | mg/kg | mg/kg | mg/kg | μg/kg |
(2) The powder processor 3 is a horizontal stirring powder processor, polypropylene powder P2 enters the powder processor 3 through a lower plug valve, a heating medium H1 introduced into the jacket is water vapor, and the heating medium H2 after heat exchange with the polypropylene powder in the powder processor 3 is discharged from the other side; heating polypropylene powder P3 in a powder processor, heating the polypropylene powder from 44 ℃ to 118 ℃ in the powder processor 3, and further filtering generated tail gas V2 in a tail gas filter 4, wherein hot nitrogen N2 is introduced into the tail gas filter 4, the filtered tail gas V3 is discharged into a purifier 6 from the upper part, the operating pressure of the tail gas filter 4 is 0.08MPaA, and the operating temperature is 118 ℃.
(3) The polypropylene powder P4 after the heating treatment enters a degassing bin 5, and hot nitrogen N3 is blown into the lower part of the degassing bin 5 to carry out degassing treatment on the polypropylene powder. The operation pressure of the powder degassing bin 5 is 0.09MPaA, the operation temperature is 118 ℃, and the residence time of the polypropylene powder P4 in the powder degassing bin 5 is 3.3 hours. And extruding and granulating the degassed polypropylene powder P5 and performing other subsequent processing treatments to obtain the polypropylene product. The tail gas V4 generated by the degassing bin 5 is discharged to the purifier 6 from the upper outlet of the degassing bin. The composition of the polypropylene powder P5 at the outlet of the powder degassing bin 5 is as follows:
| name (R) | Polypropylene | VOC | Aldehydes | Ketones | Alcohol(s) | Sulfur | COS |
| Data of | 100.0 | <36 | <1 | <1 | <1 | <1 | <1 |
| Unit of | mol％ | mg/kg | mg/kg | mg/kg | mg/kg | mg/kg | μg/kg |
VOC and oxygen-containing impurities of polypropylene powder P5 at the outlet of the powder degassing bin 5 are removed from 4760mg/kg to 40mg/kg, and the removal rate is 99.2 percent; COS in the sulfur is removed from 300 mug/kg to below 1 mug/kg, and the removal rate is 99.7 percent; the final polypropylene granular product is a bulk isotactic homopolymerization, syndiotactic homopolymerization and atactic homopolymerization blending modified polypropylene product with low cost, low VOC and high quality, the odor intensity is 0, no odor is generated, and a better technical effect is achieved.
Example 2
The device is the same as the embodiment 1, and the method is different from the embodiment 1 in that: the nominal production capacity is 30 ten thousand tons per year by adopting a gas phase method polypropylene process technology. The composition of the polypropylene powder P4 at the inlet of the powder degassing bin 5 is as follows:
the powder processor 3 is a vertical stirring powder processor, the polypropylene powder and a heating medium adopt two heat transfer modes of conduction heat transfer and convection heat transfer, and the heating medium is hot water; the operating pressure of the powder filter 1 is 0.15MPaA, and the operating temperature is 47 ℃; heating the polypropylene powder in a powder processor 3 from 47 ℃ to 96 ℃, wherein the operating pressure of a tail gas filter 4 is 0.08MPaA, and the operating temperature is 96 ℃; the operation pressure of the powder degassing bin 5 is 0.09MPaA, the operation temperature is 96 ℃, and the retention time of the polypropylene powder P4 in the powder degassing bin 5 is 1.9 hours. By adopting the equipment and the method, the polypropylene powder P5 at the outlet of the powder degassing bin 5 consists of the following components:
| name (R) | Polypropylene | VOC | Aldehydes | Ketones | Alcohol(s) | Sulfur | COS |
| Data of | 100.0 | <70 | <1 | <1 | <2 | <2 | <1 |
| Unit of | mol％ | mg/kg | mg/kg | mg/kg | mg/kg | mg/kg | μg/kg |
VOC and oxygen-containing impurities of polypropylene powder P5 at the outlet of the powder degassing bin 5 are removed from 4760mg/kg to 76mg/kg, and the removal rate is 98.4 percent; COS in the sulfur is removed from 350 mug/kg to below 1 mug/kg, and the removal rate is 99.7 percent; the final polypropylene granular product is a bulk high-crystallinity polypropylene product with low cost, low VOC and high quality, the odor intensity is 0, no odor is generated, and a better technical effect is achieved.
Example 3
The device is the same as the embodiment 1, and the method is different from the embodiment 1 in that: the polypropylene device adopts a liquid phase method polypropylene process technology, the nominal production capacity of the polypropylene pilot plant is 2 ten thousand tons/year, the single line operation is carried out, and the polypropylene powder P4 imported from the powder degassing bin 5 consists of the following components:
| name (R) | Polypropylene | VOC | Aldehydes | Ketones | Alcohol(s) | Sulfur | COS |
| Data of | 100.0 | 13600 | 120 | 120 | 250 | 200 | 700 |
| Unit of | mol％ | mg/kg | mg/kg | mg/kg | mg/kg | mg/kg | μg/kg |
The powder processor 3 is a sleeve heater, the polypropylene powder and a heating medium adopt a non-contact heat transfer mode and two heat transfer modes of conduction heat transfer and convection heat transfer, and the heating medium is hot air; the operating pressure of the powder filter 1 is 0.16MPaA, and the operating temperature is 49 ℃; heating the polypropylene powder in a powder processor 3 from 49 ℃ to 107 ℃, wherein the operating pressure of a tail gas filter 4 is 0.09MPaA, and the operating temperature is 107 ℃; the operation pressure of the powder degassing bin 5 is 0.10MPaA, the operation temperature is 107 ℃, and the residence time of the polypropylene powder P4 in the powder degassing bin 5 is 2.3 hours. By adopting the equipment and the method, the polypropylene powder P5 at the outlet of the powder degassing bin 5 consists of the following components:
| name (R) | Polypropylene | VOC | Aldehydes | Ketones | Alcohol(s) | Sulfur | COS |
| Data of | 100.0 | <40 | <1 | <1 | <1 | <1 | <1 |
| Unit of | mol％ | mg/kg | mg/kg | mg/kg | mg/kg | mg/kg | μg/kg |
VOC and oxygen-containing impurities of polypropylene powder P5 at the outlet of the powder degassing bin 5 are removed from 14290mg/kg to 44mg/kg, and the removal rate is 99.7 percent; COS in the sulfur is removed from 700 mu g/kg to below 1 mu g/kg, and the removal rate is 99.9 percent; the final polypropylene granular product is a bulk high-crystallinity, metallocene and high-impact copolymer blending modified polypropylene product with low cost, low VOC and high quality, the odor intensity is 0, no odor is generated, and a better technical effect is achieved.
Example 4
The device is the same as the embodiment 1, and the method is different from the embodiment 1 in that: the polypropylene device adopts a gas phase method polypropylene process technology, the nominal production capacity of the polypropylene industrial device is 180 ten thousand tons/year, the four-line operation is realized, the single-line production scale is 45 ten thousand tons/year, and the composition of polypropylene powder P4 imported from the powder degassing bin 5 is as follows:
| name (R) | Polypropylene | VOC | Aldehydes | Ketones | Alcohol(s) | Sulfur | COS |
| Data of | 100.0 | 10000 | 100 | 100 | 200 | 200 | 550 |
| Unit of | mol％ | mg/kg | mg/kg | mg/kg | mg/kg | mg/kg | μg/kg |
The powder processor 3 is a double-screw heater, the polypropylene powder and a heating medium adopt a non-contact heat transfer mode and a heat transfer mode of conduction heat transfer, and the heating medium is an electric heater; the operating pressure of the powder filter 1 is 0.18MPaA, and the operating temperature is 62 ℃; heating the polypropylene powder in a powder processor 3 from 62 ℃ to 99 ℃, wherein the operation pressure of a tail gas filter 4 is 0.11MPaA, and the operation temperature is 99 ℃; the operation pressure of the powder degassing bin 5 is 0.12MPaA, the operation temperature is 99 ℃, and the retention time of the polypropylene powder P4 in the powder degassing bin 5 is 2.1 hours. By adopting the equipment and the method, the polypropylene powder (P5) at the outlet of the powder degassing bin 5 comprises the following components:
| name (R) | Polypropylene | VOC | Aldehydes | Ketones | Alcohol(s) | Sulfur | COS |
| Data of | 100.0 | <55 | <1 | <1 | <1 | <1 | <1 |
| Unit of | mol％ | mg/kg | mg/kg | mg/kg | mg/kg | mg/kg | μg/kg |
VOC and oxygen-containing impurities of polypropylene powder P5 at the outlet of the powder degassing bin 5 are removed from 10600mg/kg to 59mg/kg, and the removal rate is 99.4 percent; removing COS in the sulfur compounds from 550 mu g/kg to below 1 mu g/kg, wherein the removal rate is 99.8 percent; the final polypropylene granular product is a bulk composite polypropylene product with low cost, low VOC and high quality, the odor intensity is 0, no odor is generated, and a better technical effect is achieved.
Example 5
The device is the same as the embodiment 1, and the method is different from the embodiment 1 in that: the polypropylene device adopts a liquid phase method polypropylene process technology, the nominal production capacity of the polypropylene industrial device is 45 ten thousand tons/year, the polypropylene industrial device operates in a single line, and the polypropylene powder P4 imported from the powder degassing bin 5 consists of the following components:
| name (R) | Polypropylene | VOC | Aldehydes | Ketones | Alcohol(s) | Sulfur | COS |
| Data of | 100.0 | 1870 | 20 | 20 | 40 | 50 | 200 |
| Unit of | mol％ | mg/kg | mg/kg | mg/kg | mg/kg | mg/kg | μg/kg |
The powder processor 3 is a rotary cylinder heater, the polypropylene powder and a heating medium adopt a non-contact heat transfer mode and a convection heat transfer mode, and the heating medium is water vapor; the operating pressure of the powder filter 1 is 0.11MPaA, and the operating temperature is 25 ℃; heating the polypropylene powder in a powder processor 3 from 25 ℃ to 90 ℃, wherein the operating pressure of a tail gas filter 4 is 0.04MPaA, and the operating temperature is 90 ℃; the operation pressure of the powder degassing bin 5 is 0.05MPaA, the operation temperature is 90 ℃, and the residence time of the polypropylene powder P4 in the powder degassing bin 5 is 1.0 hour. By adopting the equipment and the method, the polypropylene powder P5 at the outlet of the powder degassing bin 5 consists of the following components:
| name (R) | Polypropylene | VOC | Aldehydes | Ketones | Alcohol(s) | Sulfur | COS |
| Data of | 100.0 | <94 | <1 | <1 | <2 | <2 | <1 |
| Unit of | mol％ | mg/kg | mg/kg | mg/kg | mg/kg | mg/kg | μg/kg |
VOC and oxygen-containing impurities of polypropylene powder P5 at the outlet of the powder degassing bin 5 are removed from 2000mg/kg to 100mg/kg, and the removal rate is 95.0 percent; COS in the sulfur is removed from 200 mug/kg to below 1 mug/kg, and the removal rate is 99.5 percent; the final polypropylene granular product is a bulk rubber resin polypropylene product with low cost, low VOC and high quality, the odor intensity is 0, no odor is generated, and a better technical effect is achieved.
Example 6
In the same embodiment 1, the polypropylene device adopts a gas phase method polypropylene process technology, the nominal production capacity of the polypropylene industrial device is 45 ten thousand tons/year, the polypropylene industrial device operates in a single line, and the polypropylene powder (P4) imported from the powder degassing bin (5) comprises the following components:
| name (R) | Polypropylene | VOC | Aldehydes | Ketones | Alcohol(s) | Sulfur | COS |
| Data of | 100.0 | 14100 | 150 | 150 | 300 | 300 | 1000 |
| Unit of | mol％ | mg/kg | mg/kg | mg/kg | mg/kg | mg/kg | μg/kg |
The powder processor 3 is an inclined stirring powder processor, the polypropylene powder and the heating medium adopt a non-contact heat mass transfer mode and a parallel flow contact transfer mode, and the heating medium is hot nitrogen; the operating pressure of the powder filter (1) is 0.23MPaA, and the operating temperature is 80 ℃; heating the polypropylene powder in a powder processor 3 from 80 ℃ to 135 ℃, wherein the operation pressure of a tail gas filter (4) is 0.16MPaA, and the operation temperature is 135 ℃; the operation pressure of the powder degassing bin (5) is 0.17MPaA, the operation temperature is 135 ℃, and the retention time of the polypropylene powder (P4) in the powder degassing bin (5) is 8.0 hours. By adopting the equipment and the method of the invention, the polypropylene powder (P5) at the outlet of the powder degassing bin (5) comprises the following components:
| name (R) | Polypropylene | VOC | Aldehydes | Ketones | Alcohol(s) | Sulfur | COS |
| Data of | 100.0 | <16 | <1 | <1 | <1 | <1 | <1 |
| Unit of | mol％ | mg/kg | mg/kg | mg/kg | mg/kg | mg/kg | μg/kg |
VOC and oxygen-containing impurities of polypropylene powder (P5) at the outlet of the powder degassing bin (5) are removed from 15000mg/kg to 15mg/kg, and the removal rate is 99.9 percent; COS in the sulfur is removed from 1000 mug/kg to below 1 mug/kg, and the removal rate is 99.9 percent; the final polypropylene granular product is a bulk syndiotactic homopolymerization and high impact copolymer blending modified polypropylene product with low cost, low VOC and high quality, the odor intensity is 0, no odor is generated, and a better technical effect is obtained.
Comparative example
In the polypropylene process flow in the prior art, the operating temperature of polypropylene powder in a degassing bin is 25-80 ℃, the degassing effect is poor, 500-600 mg/kg of Volatile Organic Compounds (VOC) and aldehyde, ketone, alcohol and sulfur oxygen-containing impurities are still reserved in the degassed polypropylene powder, a certain amount of Volatile Organic Compounds (VOC) and aldehyde, ketone, alcohol and sulfur oxygen-containing impurities are still contained in a polypropylene granular product obtained by extruding and granulating the polypropylene powder, the content of sulfur in the polypropylene granular product is 100-200 mu g/kg, and the odor intensity is not less than 1, so that residual odor of the polypropylene granular product is caused.
From examples 1 to 6, it can be seen that:
(1) the polypropylene powder enters a powder processor, is heated to 90-135 ℃, and the content of Volatile Organic Compounds (VOC), aldehyde, ketone and alcohol oxygen-containing impurities in the degassed polypropylene powder is reduced from 2000-15000 mg/kg to 15-100 mg/kg; the heating temperature of the polypropylene powder is continuously increased, and the content of Volatile Organic Compounds (VOC), aldehyde, ketone and alcohol oxygen-containing impurities in the finally degassed polypropylene powder is continuously reduced;
(2) degassing the polypropylene powder in a powder degassing bin for 1.0-8.0 hours, wherein the content of Volatile Organic Compounds (VOC), aldehyde, ketone and alcohol oxygen-containing impurities in the degassed polypropylene powder is reduced from 2000-15000 mg/kg to 15-100 mg/kg; therefore, the degassing time of the polypropylene powder is continuously increased, and the content of Volatile Organic Compounds (VOC), aldehyde, ketone and alcohol oxygen-containing impurities in the finally degassed polypropylene powder is continuously reduced;
(3) the polypropylene powder enters a powder processor, is heated to 90-135 ℃, then enters a powder degassing bin for degassing treatment, the degassing time is 1.0-8.0 hours, the COS of the sulfur in the degassed polypropylene powder is removed from 200-1000 mu g/kg to below 1 mu g/kg, the odor intensity of the polypropylene granule product is 0, and the polypropylene granule product is odorless; the heating temperature of the polypropylene powder is continuously improved, the degassing time is continuously increased, the quality index of the polypropylene granule product after final degassing is always COS below 1 mu g/kg, and the odor intensity is 0;
(4) the polypropylene powder enters a powder processor, is heated to 90-135 ℃, and then enters a powder degassing bin for degassing treatment, wherein the degassing time is 1.0-8.0 hours, the removal rate of VOC and oxygen-containing impurities in the polypropylene powder is 95.0-99.9%, and the removal rate of COS in sulfur is 99.5-99.9%;
(5) the nominal production capacity of the polypropylene industrial device is 2-180 ten thousand tons/year, VOC and oxygen-containing impurities in the heated and degassed polypropylene powder are removed from 2000-15000 mg/kg to 15-100 mg/kg, and COS in sulfur is removed from 200-1000 mu g/kg to below 1 mu g/kg;
(6) the nominal production capacity of the polypropylene industrial device is 2-180 ten thousand tons/year, the removal rate of VOC and oxygen-containing impurities in the polypropylene powder after heating and degassing is 95.0-99.9%, and the removal rate of COS in sulfur is 99.5-99.9%.
Claims (10)
1. A device for preparing high-quality polypropylene products comprises a powder filter (1) and a powder degassing bin (5), and is characterized in that a powder processor (3) for heating polypropylene powder is arranged between the powder filter (1) and the powder degassing bin (5), the powder processor (3) is connected with a heat medium system for supplying heat to the powder processor (3) and heating the polypropylene powder in a non-contact manner, and a gas phase outlet of the powder processor (3) is connected with a tail gas filter (4); and gas phase outlets of the powder filter (1), the tail gas filter (4) and the powder degassing bin (5) are communicated with a tail gas purifier (6) to purify tail gas.
2. The apparatus for producing a high-quality polypropylene product according to claim 1, wherein the powder processor (3) is any one of a horizontal type agitation powder processor, a vertical type agitation powder processor, an inclined type agitation powder processor, a double-screw heater, or a rotary cylinder heater.
3. The apparatus for producing a high-quality polypropylene product according to claim 1, wherein the outer wall of the powder processor (3) is provided with a jacket for containing a heating medium.
4. A method for producing a high-quality polypropylene product using the apparatus for producing a high-quality polypropylene product according to claim 1, comprising the steps of:
(A) the polypropylene powder discharged from the reaction system enters a powder filter (1) for filtering;
(B) the filtered polypropylene powder enters a powder processor (3), a heating medium is conveyed to the powder processor (3) through a heating medium system, the polypropylene powder is heated or dried in a non-contact mode, and then the polypropylene powder enters a tail gas filter (4) for filtering;
(C) the heated polypropylene powder enters a powder degassing bin (5), hot nitrogen is blown into the powder degassing bin (5) to carry out degassing treatment on the polypropylene powder, and then a polypropylene product is prepared by an extrusion granulation process;
wherein, the exhaust tail gas generated in the processes of the steps (A) to (C) is introduced into an exhaust gas purifier (6) for purification treatment.
5. The method for producing high-quality polypropylene product using the apparatus for producing high-quality polypropylene product according to claim 4, wherein the polypropylene powder is heated from 25 to 80 ℃ to 90 to 135 ℃ in the powder processor (3).
6. The method for preparing a high-quality polypropylene product using the apparatus for preparing a high-quality polypropylene product according to claim 4, wherein the powder filter (1) has an operating pressure of 0.11 to 0.23MPaA and an operating temperature of 25 to 80 ℃; the operating pressure of the tail gas filter (4) is 0.04-0.16 MPaA, and the operating temperature is 90-135 ℃; the operation pressure of the powder degassing bin (5) is 0.05-0.17 MPaA, the operation temperature is 90-135 ℃, and the residence time of the polypropylene powder (P4) in the powder degassing bin (5) is 1.0-8.0 hours.
7. The method for preparing a high-quality polypropylene product using the apparatus for preparing a high-quality polypropylene product according to claim 4, wherein the powder filter (1) has an operating pressure of 0.12 to 0.22MPaA and an operating temperature of 30 to 75 ℃; the operating pressure of the tail gas filter (4) is 0.05-0.15 MPaA, and the operating temperature is 95-135 ℃; the operation pressure of the powder degassing bin (5) is 0.06-0.16 MPaA, the operation temperature is 95-135 ℃, and the retention time of the polypropylene powder (P4) in the powder degassing bin (5) is 1.5-8.0 hours.
8. The method for preparing a high-quality polypropylene product using the apparatus for preparing a high-quality polypropylene product according to claim 4, wherein the powder filter (1) has an operating pressure of 0.13 to 0.21MPaA and an operating temperature of 35 to 70 ℃; the operating pressure of the tail gas filter (4) is 0.06-0.14 MPaA, and the operating temperature is 100-135 ℃; the operation pressure of the powder degassing bin (5) is 0.07-0.15 MPaA, the operation temperature is 100-135 ℃, and the retention time of the polypropylene powder (P4) in the powder degassing bin (5) is 2.0-8.0 hours.
9. The method for preparing a high-quality polypropylene product using an apparatus for preparing a high-quality polypropylene product according to claim 4, wherein in the step (B), the heating medium is at least one of electricity, heat transfer oil, hot air, hot nitrogen, water vapor and hot water.
10. The method for preparing the high-quality polypropylene product by using the device for preparing the high-quality polypropylene product according to claim 4, wherein the tail gases discharged by the powder filter (1), the tail gas filter (4) and the powder degassing bin (5) are combined and then sent to a tail gas purifier (6), and the VOC in the tail gases is removed by adopting a catalytic oxidation method.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114381033A (en) * | 2022-01-18 | 2022-04-22 | 佛山市南海和琦润高分子材料有限公司 | Laser etching auxiliary agent for plastic products, production equipment and processing technology |
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| CN105482151A (en) * | 2015-12-17 | 2016-04-13 | 北方华锦化学工业集团有限公司 | Polypropylene discharged powder recycling system |
| CN209257273U (en) * | 2018-11-02 | 2019-08-16 | 浙江卫星能源有限公司 | A kind of drying device of polypropylene powder |
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| US4820463A (en) * | 1986-05-06 | 1989-04-11 | Bp Chemicals Limited | Process of degassing and pelletizing polyolefins |
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Application publication date: 20210316 |