CN102603934B - Degassing process of high density polyethylene - Google Patents
Degassing process of high density polyethylene Download PDFInfo
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Abstract
The invention provides a degassing technology capable of effectively removing the odor of high density polyethylene (HDPE). The polyethylene (PE) material particles with a certain particle size are steamed and inactivated by low-pressure steam in a steamer, are fluidized and dried by hot nitrogen in a fluidized drier, and are added with an auxiliary and the like to achieve the purposes of inactivating a catalyst, removing a catalyst oxide and effectively reducing volatile matters, so that the technology provided by the invention thoroughly solves the problem of the odor of a product, and remarkably improves the product quality.
Description
Technical field
The present invention relates to a kind of novel high density polyethylene(HDPE) production technology, particularly, relate to the Degassing Technology of high density polyethylene(HDPE).
Background technology
Polyethylene (PE) is the most important derived product of ethene, is a kind of thermoplastic resin that ethene makes through polymerization.Polyethylene accounts for 70% of world's polyolefine consumption, accounts for 44% of total thermoplasticity general-purpose plastics consumption.Polyvinyl originally is divided into three major types, i.e. Low Density Polyethylene (LDPE), high density polyethylene(HDPE) (HDPE) and LLDPE (LLDPE).At present, China's polyethylene production with compare in addition larger gap abroad.On the one hand, domestic unit scale is less than normal, and material consumption, energy consumption are high; On the other hand, in product structure, kind is fewer, and especially the expensive goods ratio is low.
High density polyethylene(HDPE) (High Density Polyethylene is called for short HDPE) is high, the nonpolar thermoplastic resin of a kind of degree of crystallinity.The milky appearance of ortho states HDPE, its meagre cross section is to a certain degree translucent.Polyethylene (being called for short PE) has most industry and lives with the good characteristic of chemical.HDPE does not have corrodibility, and non-hygroscopic, can be used for wrapping material, and in addition, HDPE has good non-conductive performance, and the insulative dielectric constant is high, makes it be well suited for the parcel electric wire.In there is fabulous shock resistance to the PE of high molecular grade, this characteristic even still keeps at normal temperature under-40 ℃ of low temperature.
High density polyethylene(HDPE) production technique device, most ethene polymerization process by slurry that adopt the Mitsui oiling.The most common production method of PE is by slurry process or gas phase processing method, and minority solution phase processing is also arranged.All these reaction process are all the thermopositive reaction participated in by vinyl monomer, 'alpha '-olefin monomers, catalyst system (the more than a kind of compound of possibility) and various types of hydrocarbon diluent, and hydrogen and some catalyzer are used for controlling synthetic PE molecular weight.Slurry-phase reactor is generally stirring tank or a kind of large-sized annular reactor more commonly used, and slip can circulation stirring therein.When ethene contacts with catalyzer one with comonomer (as required), will form polyethylene particle.After removing thinner, polyethylene particle or powder are dried, more according to dosage add additive, just produce pellet.With the modern production line of the large-scale reactor of twin screw extruder, can per hour produce PE and reach more than 40000 pounds.The performance of improving new grade HDPE that is developed as of raw catalyst contributes.Two kinds of the most frequently used catalyzer are respectively that to take the chromated oxide of Philips be basic catalyzer and titanium compound-aluminum alkyl catalyst.
This production technique adopts two still serial or parallel connection operations, and product comprises the types such as blowing, injection moulding, extrusion molding, its good quality of product, and processing characteristics is better.But the subject matter existed in prior art is that product has larger smell, through overtesting and analysis, find that smell is mainly that fugitive constituent and the volatilization of catalyst oxidation thing residual in product is caused, concentration approximately has 0.3% (3000ppm).
Therefore a kind of novel high density polyethylene(HDPE) Degassing Technology need to be developed in this area, to eliminate the smell of PE product, improves the quality of products.
Summary of the invention
Main purpose of the present invention is to provide a kind of novel high density polyethylene(HDPE) Degassing Technology, to reduce the volatile content in polyethylene product, thoroughly solves the smell problem of product, further Improving The Quality of Products.
The invention provides a kind of degasification technique of high density polyethylene(HDPE), described degasification technique comprises step:
(a) the high density polyethylene(HDPE) powder is after gas solid separation, and the powder solid is transferred pneumatic transmission and enters steamer, and 100-110 ℃ of use, the following steam of 1.2MPa are eliminated residual catalyst activity in polyethylene powder;
(b) the high density polyethylene(HDPE) powder through the decatize deactivation enters in fluidized bed dryer, stops more than 2 minutes, and 90-110 ℃ of drying, remove fugitive constituent and catalyst oxidation thing;
(c) from fluidized bed dryer, high density polyethylene(HDPE) powder out is transferred pneumatic transmission and enters interchanger to be cooled to 55-65 ℃.
In above-mentioned steps (b) and step (c), conveying gas is conveyed into auxiliary agent respectively in steamer and fluidized bed dryer, described auxiliary agent be the alkaline-earth metal salt one or more, the mixture of aluminum oxide and C2-C4 alkyl alcohol.
Above-mentioned steps (a) is mainly to eliminate catalyst activity, simultaneously, under steam and promoter effect, also can remove small portion fugitive constituent and catalyst oxidation thing.
The particle diameter of above-specified high density polyethylene powder is 100 μ m-5mm.
Above-mentioned gas solid separation adopts cyclonic separator or cyclonic separator and sack cleaner.
Establish sack cleaner between one side on above-mentioned steamer top and fluidized bed dryer, described sack cleaner is separated the powder solid in the steamer ascending gas, delivers in fluidized bed dryer.
The gas solid separation machine is established on above-mentioned fluidized bed dryer one end top, and the powder solid that described gas solid separation machine is taken the fluidized bed dryer ascending gas out of is separated, and sends back in fluidized bed dryer.
The gas solid separation machine on above-mentioned fluidized bed dryer one end top is sack cleaner.
The particle diameter of above-specified high density polyethylene powder is 500 μ m-4mm.
The residence time of above-specified high density polyethylene powder in fluidized bed dryer is 3-4 minute.
The above-specified high density polyethylene powder is transferred gas and sends in fluidized bed dryer with the speed of 0.8m/s-4m/s.
The poly Degassing Technology of above-specified high density, is characterized in that, described high density polyethylene(HDPE) powder is transferred gas and sends in fluidized bed dryer with the speed of 1m/s-3m/s.
Above-mentioned alkaline earth salt is modification magnesium borate or calcium chloride; Described C2-C4 alkyl alcohol is ethanol, propyl alcohol or butanols, is preferably technical grade ethanol.
Abovementioned alkyl alcohol content is 60-80%wt, and above-mentioned alumina content is 5-10%wt, and surplus is alkaline earth salt.Described alkaline earth salt is modification magnesium borate or calcium chloride.Described alkyl alcohol is ethanol.
Above-mentioned auxiliary dosage is 100-10000ppm.Preferably, described auxiliary dosage is 1000-6000ppm.
Above-mentioned conveying gas is nitrogen or rare gas element.
Above-mentioned interchanger is finned tube heat exchanger.Find by analysis, the smell in the PE product is mainly caused by residual volatile component and catalyst oxidation thing, and residual volatile component is hexane solvent.For effectively removing the smell in the PE product, in the present invention, adopt auxiliary agent to add the industrial technology means such as (harmless), decatize deactivation and fluidized drying and processed.
At first, add auxiliary agent in the PE powder, the particle diameter of PE powder is 100 μ m-5mm, say exactly to be 500 μ m-4mm, the auxiliary agent added be mainly the alkaline-earth metal salt one or more (as the modification magnesium borate, metal halide is as calcium chloride etc.), the mixture of C2-C4 alkyl alcohol and aluminum oxide, the consumption of auxiliary agent is 100-10000ppm, is more preferably 1000-6000ppm.The purpose of adding auxiliary agent is to increase the specific surface area of material, is beneficial to the volatilization of volatile matter in degassed processing.
Secondly, the decatize deactivation, pass into low pressure (being less than or equal to 1.2MPa) steam and make original trace catalyst inactivation in the PE material in steamer, the purpose of this technical finesse is to eliminate the remaining activity of the catalyzer in the PE material, promotes the volatilization of catalyst oxidation thing.Low-pressure steam and hot nitrogen are entered by the bottom of steamer, flow from bottom to top; And the PE material (approximately 80 ℃) of heat adds from the top of steamer, by gravity, flow downward, in this course, the PE material fully contacts with low-pressure steam is reverse, mass-and heat-transfer, to reach the purpose that promotes catalyst oxidation thing and fugitive constituent volatilization, wherein, the temperature of low-pressure steam and hot nitrogen is 100-110 ℃, and the temperature of the hot nitrogen entered from the steamer bottom is 110-130 ℃.
Again, fluidized drying, at a certain temperature, make the PE material stop certain hour to reach dry purpose in fluidized-bed.Specifically, the PE material of heat is by the bottom input of fluidized bed dryer under the blowing of the hot nitrogen of 90-110 ℃ of left and right, and rolling is from bottom to top flowed, and makes the fugitive constituent further volatilization in fluidized-bed in the PE material, and concentration is down to below 300ppm.In this process, the conveying gas operating speed of fluidized bed dryer is about 0.8m/s-4m/s, is more preferably 1m/s-3m/s.Like this, more than the residence time of PE material in fluidized bed dryer can reach 2min, most optimal retention time is 3min-4min.
Above-mentioned PE product degassing technology not yet has precedent at present at home, on the basis of the production technique of high density polyethylene(HDPE), is aided with corresponding treatment system and carries out degassed drying operation, not only can eliminate the smell in product, and quality that can improving product.Detect to find, adopt the volatile matter in the high density polyethylene(HDPE) that this technology produces to be down to below 0.03% from 0.3% original left and right, make original technical grade wrapping material upgrade to the food grade wrapping material.
The accompanying drawing explanation
Fig. 1 is liquid process flow diagram of the present invention.
Fig. 2 is gas phase process flow diagram of the present invention.
The schematic diagram of the de-gassing vessel that Fig. 3 is high density polyethylene(HDPE).
1, steamer; 11, cyclonic separator; 12, sack cleaner; 2, fluidized bed dryer; 22, sack cleaner; 3, interchanger III; 4, interchanger I; 5, interchanger IV; 6, whizzer; 7, lime set tank I; 8, lime set tank II; 9, feed bin; 91, cyclonic separator; 10, switching valve; 13, interchanger II.
Embodiment
The degasification technique of high density polyethylene(HDPE) of the present invention comprises step:
(a) the high density polyethylene(HDPE) powder is after gas solid separation, and the powder solid is transferred pneumatic transmission and enters steamer, and 100-110 ℃ of use, the following steam of 1.2MPa are eliminated the catalyst activity in polyethylene powder;
(b) be transferred pneumatic transmission through the high density polyethylene(HDPE) powder of decatize deactivation and enter in the fluidisation bed dryer, stop more than 2 minutes, 90-110 ℃ of drying, remove fugitive constituent and catalyst oxidation thing;
(c) from fluidized bed dryer, high density polyethylene(HDPE) powder out is transferred pneumatic transmission and enters in interchanger to be cooled to 55-65 ℃.
Preferably, the gas solid separation machine is established on described steamer and fluidized bed dryer top.
Conveying gas of the present invention can be nitrogen or rare gas element.Conveying gas of the present invention can recycle, has saved the energy.As shown in Figure 1, the de-gassing vessel of high density polyethylene(HDPE) of the present invention mainly consists of steamer 1, fluidized bed dryer 2, interchanger 3, interchanger 13 and air transporting arrangement etc.Steamer 1 top, with cyclonic separator 11 (being the gas solid separation unit 1 in Fig. 2), also can be furnished with sack cleaner (being sign in figure), in addition so that gas solid separation is more thorough.Cyclonic separator 11 is connected between the whizzer 6 and steamer 1 of PE Production Flow Chart, and sack cleaner 12 (the gas solid separation machine 2 in Fig. 2) is connected between steamer 1 top one side and fluidized bed dryer 2.One switching valve 10 is arranged between whizzer 6 and cyclonic separator 11, and by the conversion of switching valve 10, the PE Production Flow Chart can be transformed into the present invention from conventional path and put the degasification technique path.Conventional path is that whizzer 6 is to cyclonic separator 91 (being the gas solid separation unit 4 in Fig. 2) to feed bin 9, then granulation; Gas solid separation unit 4 can be also to add sack cleaner between cyclonic separator 91 and feed bin.Between cyclonic separator 11 and switching valve 10, an interchanger 13 (being the interchanger I in Fig. 2) is arranged.This covering device interchanger has drawn 4 main interchanger, and all the other interchanger are not shown in detail, and mainly regulates the temperature of conveying gas to be applicable to the temperature of reaction of all parts.Fluidized bed dryer 2 one end tops connect sack cleaner 22 (being the gas solid separation machine 3 in Fig. 2), the powder solid that this gas solid separation machine is taken the fluidized bed dryer ascending gas out of is separated, send back in fluidized bed dryer, the isolated gas of a part enters flare system and does vent gas treatment, another part, through interchanger 4, lime set tank II and interchanger 5, is sent into recycle in steamer 1 and fluidized bed dryer 2 again.
Air transporting arrangement is steamer and moisture eliminator supplying nitrogen, and recycle nitrogen.
Polyethylene (PE) (85 ℃ of left and right) from whizzer 6 is powder, its particle diameter is about 100 μ m-5mm, preferably, particle diameter is at 500 μ m-4mm, powder is by under the effect of the nitrogen (80 ℃ of left and right) of air transporting arrangement, is admitted in the cyclonic separator 11 on steamer top and carries out gas-solid body separation.Isolated solid polyethylene directly enters in steamer 1, and isolated gas enters sack cleaner 12, and the nitrogen separated from sack cleaner 12 enters nitrogen circulating system, and isolated solid particulate enters in fluidized bed dryer 2.Polyethylene particle (PE, 80 ℃ of left and right) in steamer from top to bottom by gravity flowage and with steamer in pass into low-pressure steam (100-110 ℃, pressure is less than 1.2MPa, comparatively ideal temperature range is 103-108 ℃.), hot nitrogen (110-130 ℃, preferably 120 ℃ of left and right) anti-phase contact mass transfer conducts heat, low-pressure steam makes original trace catalyst inactivation.Polyethylene after decatize (PE, 90 ℃ of left and right) is drawn off and is entered in fluidized bed dryer 2 further dry by discharge nozzle, feed auger by the rotary valve of steamer 1 bottom.Polyethylene particle (FE in moisture eliminator, 90 ℃ of left and right) at hot nitrogen (90-110 ℃, 100 ℃ of left and right preferably) under blowing, rolling is from bottom to top flowed and is further removed fugitive constituent to 270ppm, sack cleaner 22 is established on moisture eliminator top, after the solid that ascending gas is taken out of separates, send into fluidized bed dryer 2, the isolated gas of a part enters flare system and does vent gas treatment, another part, through interchanger 4, lime set tank II and interchanger 5, is sent into recycle in steamer 1 and fluidized bed dryer 2 again.
In fluidized bed dryer 2, PE powder out, through finned tube heat exchanger 3 heat exchange, is cooled to 55-65 ℃ by 90 ℃ of left and right, preferably, 60 ℃ of left and right, cooled PE enters feed bin 9 and then granulation through gas solid separation unit 4 (being cyclonic separator 91).
Can also add auxiliary agent and carry out the sterilization deactivation in steamer and moisture eliminator, and increase material specific surface area.The composition of auxiliary agent is: the mixture of one or more of alkaline-earth metal salt (as modification magnesium borate, calcium chloride etc.), aluminum oxide and C2-C4 alkyl alcohol.Auxiliary dosage is 100-10000ppm, better, and auxiliary dosage is 1000-6000ppm.Auxiliary agent is sent in steamer and moisture eliminator by pneumatic conveyer.Wherein, the shared mass percent 60-80%wt of alkyl alcohol, preferred alcohol, alumina content is 5-10%wt, surplus is alkaline earth salt.Described alkaline earth salt is modification magnesium borate and/or calcium chloride.
What pneumatic conveyer was carried can be nitrogen or rare gas element.Rare gas element can be helium, neon, argon gas etc.
By steamer, moisture eliminator expellant gas, through the sack cleaner 12 on top separately and the blower fan be connected by it after 22 dedustings (in figure for indicating), drawn, and through lime set tank 8, dehumidify again after being cooled to 50 ℃ of left and right by interchanger 4, follow bad the use after interchanger 5 heating.Gas phase composition regular monitoring, regularly extraction, regularly mend nitrogen, for controlling in real time.Supplement flow and go the extraction flow relevant with the process matched therewith scale, being controlled by central control system, can be set in certain scope, more satisfactory flow range is 0-500Nm
3/ h.The gas of extraction or recycle and reuse, or be incorporated to the torch pipe network.Interchanger I, II are comprised of finned tube, can be directly cooling with air.The circulation conveying gas, discharge N after the volatilizable lease making lime set tank I that auxiliary agent absorbs, II condensation
2continuation is used in reaction as circulation gas.
Degasifying device of the present invention can be connected with the ordinary process system by switching valve.As shown in figures 1 and 3, from revolving drier out, 2 paths being arranged, is 1. conventional route, 2., for having increased the route after degassing process of the present invention, by switching valve, can between 2 paths, freely switch.
Fig. 2 is the gas phase schema.By steamer, moisture eliminator gas out after the gas solid separation unit 1 on top separately (in Fig. 3 11), gas solid separation machine 2 (in Fig. 3 22) dedusting by it connected induced draft fan draw, and through lime set tank II (in Fig. 3 8) dehumidifying, recycle again after interchanger I (in Fig. 3 4) is cooled to 50 ℃ of left and right.Fresh nitrogen and circulating nitrogen gas are as conveying gas, the gas delivery finished product is after interchanger II (in Fig. 3 13), after gas solid separation unit 4 (in Fig. 3 91) by it connected induced draft fan draw, and minute two-way, one tunnel after lime set tank I (in Fig. 3 7) dehumidification by condensation as conveying gas, the whizzer outlet material is transported to gas solid separation unit 1 or 4, gas after gas solid separation unit 1 (in Fig. 3 11) and gas-solid separating machine group 4 (in Fig. 3 91) recycles after lime set tank I dehumidifying.Gas phase composition regular monitoring, regularly extraction, regularly mend nitrogen.From the tail gas of gas solid separation machine 3 (22 Fig. 3) extraction, pass through recycle and reuse or be incorporated to the torch official website and process.
Volatile content after table 1 auxiliary dosage and processing
As shown in Table 1, from 6000ppm, be raised to 10000ppm, the effect of removing volatile matter is also not obvious, and therefore, degassing process preferred promoter consumption of the present invention is 1000-6000ppm.PPM (English: Parts Per Million, be called for short ppm), be defined as 1,000,000/, 1ppm be 1,000,000/, be mass percent.
According to embodiments of the invention describing the present invention property and nonrestrictive description, but should be understood that in the situation that do not break away from relevant protection domain defined by the claims, those skilled in the art can make various changes and/or modification.
Claims (39)
1. the degasification technique of a high density polyethylene(HDPE), is characterized in that, described degasification technique comprises step:
(a) the high density polyethylene(HDPE) powder is after gas solid separation, and the powder solid is transferred pneumatic transmission and enters steamer, with the 100-110 ° of following steam of C, 1.2MPa, eliminates residual catalyst activity in polyethylene powder;
(b) the high density polyethylene(HDPE) powder through the decatize deactivation enters in fluidized bed dryer, stops more than 2 minutes, and 90-110 ° of C drying, remove fugitive constituent and catalyst oxidation thing;
(c) from fluidized bed dryer, high density polyethylene(HDPE) powder out is transferred pneumatic transmission and enters interchanger to be cooled to 55-65 ° of C;
In described step (b) and step (c), conveying gas is conveyed into auxiliary agent respectively in steamer and fluidized bed dryer, described auxiliary agent be the alkaline-earth metal salt one or more, the mixture of aluminum oxide and C2-C4 alkyl alcohol.
2. according to the degasification technique of the high density polyethylene(HDPE) of claim 1, it is characterized in that, the particle diameter of described high density polyethylene(HDPE) powder is 100 μ m-5mm.
3. the degasification technique of high density polyethylene(HDPE) according to claim 1, is characterized in that, described gas solid separation adopts cyclonic separator or cyclonic separator and sack cleaner.
4. the degasification technique of high density polyethylene(HDPE) according to claim 1, it is characterized in that, establish sack cleaner between one side on described steamer top and fluidized bed dryer, described sack cleaner is separated the powder solid in the steamer ascending gas, delivers in fluidized bed dryer.
5. according to the degasification technique of the described high density polyethylene(HDPE) of the arbitrary claim of claim 1-4, it is characterized in that, the gas solid separation machine is established on described fluidized bed dryer one end top, the powder solid that described gas solid separation machine is taken the fluidized bed dryer ascending gas out of is separated, and sends back in fluidized bed dryer.
6. the degasification technique of high density polyethylene(HDPE) according to claim 5, is characterized in that, described gas solid separation machine is sack cleaner.
7. according to the degasification technique of the described high density polyethylene(HDPE) of the arbitrary claim of claim 1-4, it is characterized in that, the particle diameter of described high density polyethylene(HDPE) powder is 500 μ m-4mm.
8. the degasification technique of high density polyethylene(HDPE) according to claim 5, is characterized in that, the particle diameter of described high density polyethylene(HDPE) powder is 500 μ m-4mm.
9. the degasification technique of high density polyethylene(HDPE) according to claim 6, is characterized in that, the particle diameter of described high density polyethylene(HDPE) powder is 500 μ m-4mm.
10. according to the degasification technique of the described high density polyethylene(HDPE) of the arbitrary claim of claim 1-4, it is characterized in that, the described residence time of high density polyethylene(HDPE) powder in fluidized bed dryer is 3 – 4 minutes.
11. the degasification technique of high density polyethylene(HDPE), is characterized in that according to claim 5, the described residence time of high density polyethylene(HDPE) powder in fluidized bed dryer is 3 – 4 minutes.
12. the degasification technique of high density polyethylene(HDPE), is characterized in that according to claim 6, the described residence time of high density polyethylene(HDPE) powder in fluidized bed dryer is 3 – 4 minutes.
13. the degasification technique of high density polyethylene(HDPE), is characterized in that according to claim 7, described high density polyethylene(HDPE) powder is transferred gas and sends in fluidized bed dryer with the speed of 0.8m/s-4m/s.
14. the degasification technique of high density polyethylene(HDPE), is characterized in that according to claim 8, described high density polyethylene(HDPE) powder is transferred gas and sends in fluidized bed dryer with the speed of 0.8m/s-4m/s.
15. the degasification technique of high density polyethylene(HDPE), is characterized in that according to claim 9, described high density polyethylene(HDPE) powder is transferred gas and sends in fluidized bed dryer with the speed of 0.8m/s-4m/s.
16. the degasification technique of high density polyethylene(HDPE), is characterized in that according to claim 10, described high density polyethylene(HDPE) powder is transferred gas and sends in fluidized bed dryer with the speed of 1m/s-3m/s.
17. the degasification technique according to the described high density polyethylene(HDPE) of claim 11, is characterized in that, described high density polyethylene(HDPE) powder is transferred gas and sends in fluidized bed dryer with the speed of 1m/s-3m/s.
18. the degasification technique according to the described high density polyethylene(HDPE) of claim 12, is characterized in that, described high density polyethylene(HDPE) powder is transferred gas and sends in fluidized bed dryer with the speed of 1m/s-3m/s.
19. the degasification technique according to the described high density polyethylene(HDPE) of the arbitrary claim of claim 2-4,13-18, is characterized in that, described alkaline earth salt is modification magnesium borate or calcium chloride; Described C2-C4 alkyl alcohol is ethanol, propyl alcohol or butanols.
20. the degasification technique of high density polyethylene(HDPE), is characterized in that according to claim 5, described alkaline earth salt is modification magnesium borate or calcium chloride; Described C2-C4 alkyl alcohol is ethanol, propyl alcohol or butanols.
21. the degasification technique of high density polyethylene(HDPE), is characterized in that according to claim 6, described alkaline earth salt is modification magnesium borate or calcium chloride; Described C2-C4 alkyl alcohol is ethanol, propyl alcohol or butanols.
22. the degasification technique according to the described high density polyethylene(HDPE) of claim 19, is characterized in that, described alkyl alcohol content is 60-80%wt, and described alumina content is 5-10%wt, and surplus is alkaline earth salt.
23. the degasification technique according to the described high density polyethylene(HDPE) of claim 20, is characterized in that, described alkyl alcohol content is 60-80%wt, and described alumina content is 5-10%wt, and surplus is alkaline earth salt.
24. the degasification technique according to the described high density polyethylene(HDPE) of claim 21, is characterized in that, described alkyl alcohol content is 60-80%wt, and described alumina content is 5-10%wt, and surplus is alkaline earth salt.
25. the degasification technique according to the described high density polyethylene(HDPE) of the arbitrary claim of claim 22-24, is characterized in that, described alkyl alcohol is ethanol.
26. the degasification technique according to claim 2-4,13-18, the described high density polyethylene(HDPE) of the arbitrary claim of 22-24 is characterized in that described auxiliary dosage is 100-10000ppm.
27. the degasification technique of high density polyethylene(HDPE), is characterized in that according to claim 5, described auxiliary dosage is 100-10000ppm.
28. the degasification technique of high density polyethylene(HDPE), is characterized in that according to claim 6, described auxiliary dosage is 100-10000ppm.
29. the degasification technique according to the described high density polyethylene(HDPE) of claim 25, is characterized in that, described auxiliary dosage is 100-10000ppm.
30. the degasification technique according to the described high density polyethylene(HDPE) of the arbitrary claim of claim 22-24, is characterized in that, described auxiliary dosage is 1000-6000ppm.
31. the degasification technique according to the described high density polyethylene(HDPE) of claim 25, is characterized in that, described auxiliary dosage is 1000-6000ppm.
32. the degasification technique according to claim 1-4,13-18, the described high density polyethylene(HDPE) of the arbitrary claim of 22-24 is characterized in that described conveying gas is nitrogen or rare gas element.
33. the degasification technique of high density polyethylene(HDPE), is characterized in that according to claim 5, described conveying gas is nitrogen or rare gas element.
34. the degasification technique of high density polyethylene(HDPE), is characterized in that according to claim 6, described conveying gas is nitrogen or rare gas element.
35. the degasification technique according to the described high density polyethylene(HDPE) of claim 25, is characterized in that, described conveying gas is nitrogen or rare gas element.
36. the degasification technique according to claim 1-4,13-18, the described high density polyethylene(HDPE) of the arbitrary claim of 22-24 is characterized in that described interchanger is finned tube heat exchanger.
37. the degasification technique of high density polyethylene(HDPE), is characterized in that according to claim 5, described interchanger is finned tube heat exchanger.
38. the degasification technique of high density polyethylene(HDPE), is characterized in that according to claim 6, described interchanger is finned tube heat exchanger.
39. the degasification technique according to the described high density polyethylene(HDPE) of claim 25, is characterized in that, described interchanger is finned tube heat exchanger.
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| CN110845642A (en) * | 2019-10-18 | 2020-02-28 | 中国石油化工股份有限公司 | Production device and method for low-VOC (volatile organic compound) polyethylene product by slurry process |
| CN112480291B (en) * | 2020-12-10 | 2023-04-07 | 天华化工机械及自动化研究设计院有限公司 | Method for further improving quality of polypropylene product produced by gas phase method |
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| CN101896324A (en) * | 2007-12-18 | 2010-11-24 | 波利亚里斯技术有限公司 | Removing volatile compounds from polymer pellets |
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