CN204007005U

CN204007005U - System for the production of polyamide pellet

Info

Publication number: CN204007005U
Application number: CN201420173233.7U
Authority: CN
Inventors: 查尔斯·R·克尔曼; 托马斯·A·米茨卡
Original assignee: Invista Technologies SARL Switzerland
Current assignee: Invista North America LLC
Priority date: 2013-05-01
Filing date: 2014-04-10
Publication date: 2014-12-10
Anticipated expiration: 2024-04-10
Also published as: TWM507342U

Abstract

The application relates to wet cutting and dry polyamide pellet.System and method described herein is for dry polyamide pellet.In a plurality of embodiments, the utility model provides a kind of system for the production of polyamide pellet.Described system can comprise rotary dryer, described rotary dryer from wet polyamide pellet remove most surfaces water with generating portion the pellet that is dried.Described system can also comprise fluidized bed dryer, and described fluidized bed dryer is dried and sends described partly dry pellet from described rotary dryer to produce dry polyamide pellet.

Description

System for the production of polyamide pellet

The cross reference of related application

The application requires the benefit of priority of the U.S. Provisional Patent Application submitted on May 1st, 2013 number 61/818,111, and it is open is combined in this with its full content by reference.

Technical field

The application relates to wet cutting and dry polyamide pellet.

Background technology

Polyamide is produced by the subunit of the reaction that water is little by little removed to drive therein polymerisation to carry out forward conventionally.The method produces long sticky polymers, and it is extruded conventionally as line material is to allow further processing.After by the sclerosis of line material, can be cut into pellet, also referred to as thin slice or particle.Different from line material or rod, pellet can easily flow, and can easily pack, and can be melted to be formed with afterwards the goods of use.Therefore, pellet is the business form easily of polyamide.

For allowing to extrude, tacky polyamide is heated to hold it in molten condition.After extruding, by line material rapidly cooling with stabilisation line material the sclerosis of accelerating them to prepare for cutting.Water is the useful medium for cooling polyamide thread material.Therefore, conventionally polyamide thread material being immersed in to water in water or after just extruding sprays.Similarly, conventionally use wet comminutor that polyamide thread material is cut into pellet.Yet polyamide is moisture absorption slightly.Be exposed to for a long time water, especially at high temperature, can cause the qualitative change of Partial digestion, fusing and polyamide.Too much be exposed to heat and can cause polyamide flavescence.Therefore should be by polyamide pellet from wet line material with separated for being dried to produce useful commercial product in suitable temperature fast from wet comminutor.Yet, although pellet is dry, to carry out fast ideally, it is not taken under the condition that causes flavescence carries out, and remarkable degraded, hydrolysis and pellet fusing should so lentamente so that not occur yet.

Summary of the invention

Polyamide pellet is removed and pellet dry problem under suitable condition is solved by system and method described herein from water source rapid moving.Water cooling by line material and that wet cutting granulation is introduced is surface water substantially.The center of pellet generally has acceptable water content, unless pellet is exposed to the significantly long time of moisture of or granulation cooling from line material.Therefore, pellet solves a part of problem from introducing the transmission of the position of water.Can use pellet rotary dryer to remove most surfaces water.Yet it may be inadequate using separately rotary dryer.For dried granules fully, the long pellet time of staying that can be in rotary dryer, or can need rotary dryer in high-temperature operation.Long residence time delays to produce.The use of high temperature can cause pellet flavescence.Long residence time and high temperature also need to use significantly many energy.

These problems are by being used two driers to solve: remove the rotary dryer of most of water, and lower transmission (sub-transport) fluidized bed dryer that pellet is dried to specification.

An aspect of theme of the present invention is a kind of system for the production of polyamide pellet, and described system comprises:

A) rotary dryer, described rotary dryer from wet polyamide pellet remove most surfaces water with generating portion the pellet that is dried; With

B) fluidized bed dryer, described fluidized bed dryer is dried and sends the partly dry pellet of spinning drier to produce dry polyamide pellet.

The aspect of other of theme of the present invention is a kind of systems for the production of polyamide pellet, and described system comprises:

A) wet cutting comminutor, described wet cutting comminutor is configured to cut polyamide thread material in water and to be created in the outside of pellet, has the pellet of water layer;

B) rotary dryer, described rotary dryer flashes away water layer; With

C) fluidized bed dryer, described fluidized bed dryer will be dried and send the pellet of spinning drier.

The aspect of other of theme of the present invention is a kind of methods, and described method comprises:

A) the polyamide pellet Rotary drying that will wet, with by most surfaces water from described wet polyamide pellet remove and generating portion the pellet that is dried; With

B) described partly dry pellet is further dry in fluidized bed dryer, described fluidized bed dryer is dried and sends the pellet of spinning drier.

A) the wet cutting under the existence of water of polyamide thread material is had to the pellet of water layer to be created in the outside of pellet;

B) by pellet Rotary drying with flash distillation water layer generating portion the pellet that is dried; With

C) partly dry pellet is further dry in fluidized bed dryer, described fluidized bed dryer is dried and sends the pellet of spinning drier.

Accompanying drawing explanation

Fig. 1 describing herein for the schematic diagram of the feature of the drying system of polyamide production system continuously according to a plurality of embodiments that be example.

The specific embodiment

System and method described herein by rapidly pellet is removed to online material and forms and granulation process in the water that uses and by pellet in the situation that not have large energy to consume effectively dry, effectively reduce polyamide pellet and be exposed to water and absorption water.

The polyamide thread material that polyamide pellet can be extruded by cutting is made.This can use comminutor to complete, and it automatically cuts polyamide thread material with selected interval.Polyamide is when being molten condition from line material die head out time, and line material hardens when they are cooling.Line material can be immersed in water or with water and spray to promote that line material is cooling.In online material cutting process, also can there is water.Therefore, can use in aqueous environment " wet cutting " comminutor of (for example, under water or water spray cutting zone) cutting polyamide thread material.The benefit of water is comprised, for example, molten polyamide cooling fast, dust reduces, and to a certain degree more clean granulation.Yet polyamide pellet can absorb water and polyamide pellet should be dried before storing or packing.Ideally, carrying out rapidly and effectively pellet is dried.

The dry problem of pellet due in pellet, exist variable water and by expection in the process of drying means less than water introduce and occur.For example, the other water of or granulation cooling from line material can expection less than interval introduce (for example,, by dripping or be sprayed on just dry pellet).Add the intermittence of the water of variable and cause poor dry product or increase drying time.Can need other energy so that pellet is dry fully.The configuration of production system can be reduced the incidence that unexpected water is introduced by transformation, but this transformation may cause the size of system or take up an area unfavorable increase, and the configuration again of system may still provide inadequate pellet dry when adopting single drying unit.

The dry problem of polyamide pellet is by adopting two pellet drying units to solve.The first pellet Rotary drying unit removes most of water, and the second fluid bed drying unit completes dry run and transmit pellet away from water source (for example,, away from cooling line material or wet cutting comminutor).

Wet polyamide pellet can produced in polyamide production system continuously, and this system produces water-cooled polyamide thread material.Water-cooled polyamide thread material can be cut in wet cutting comminutor.Wet cutting comminutor can be the wet cutting comminutor of any appropriate.For example; wet cutting comminutor can be to derive from Gala (Eagle Rock; VA) adjusting (tempered) water system comminutor; as Gala SLC comminutor, Gala MAP comminutor or Gala EAC comminutor; the WSD series comminutor that derives from Bay Plastics Machine (Bay City, MI), maybe can derive from Rieter Automatik Gmbh; Grossostheim, the Rieter Automatik USG polymer strands comminutor of Germany.Wet cutting comminutor can have the output of any appropriate; 1L/ minute to about 5000L/ minute according to appointment, about 5L/ minute to about 1000L/ minute, about 10L/ minute to about 100L/ minute or about 1L/ minute or lower or 2L/ minute, 3,4,5,10,15,20,25,50,100,150,200,250,500,750,1000,2000,3000,4000, or about 5000L/ minute or higher.The wet cutting comminutor unit interval can produce the pellet of the amount of any appropriate, according to appointment 1000 pellets/minute to approximately 100,000; 000 pellet/minute, approximately 10,000 pellets/minute to approximately 50; 000,000 pellet/minute, or approximately 1000 pellets/minute or lower; or approximately 2000,5000,10,000,20,000,50; 000,100,000,250,000,500; 000,1,000,000,5; 000; 000,10,000,000,50; 000; 000 or approximately 100,000,000 pellet/minute.The temperature of leaving the pellet of comminutor can be the temperature of any appropriate; 20 ℃ to approximately 250 ℃ according to appointment, or approximately 30 ℃ to approximately 150 ℃, or approximately 35 ℃ to approximately 100 ℃; or approximately 20 ℃ or lower, or approximately 30 ℃, 50,75,100,125,150,175,200,225 or approximately 250 ℃ or higher.The total water content that leaves the pellet of comminutor can be the water content of any appropriate; 0.05 % by weight is to approximately 90 % by weight according to appointment; approximately 0.1 % by weight is to approximately 50 % by weight; 1 % by weight is to approximately 30 % by weight; or approximately 0.05 % by weight or lower, 0.5 % by weight, 1,2,3,4,5,6,8,10,12,14,16,18,20,25,30,35,40,45,50,60,70,80 or approximately 90 % by weight or higher.Pellet can have the diameter of any appropriate, and 3mm is to about 9mm according to appointment, or approximately 4 to about 7mm, or about 3mm or lower, or about 4mm, 5,6,7,8 or about 9mm or higher.Pellet can have the length of any appropriate, 0.05cm is to about 10cm according to appointment, about 0.5cm is to about 5cm, or about 0.1cm or lower, or about 0.15cm, 0.2,0.25,0.3,0.35,0.4,0.5,0.6,0.8,1,1.2,1.4,1.6,1.8,2,2.2,2.4,2.6,2.8,3,3.5,4,4.5,5,6,7,8,9 or more than about 10cm.Comminutor can need with the interval of any appropriate sharpening or maintenance; January was to approximately 200 months according to appointment; or extremely approximately 100 months about February, or about January or shorter, February, 6,12,24,30,36,42,48,54,60,70,80,90,100,125,150,175 or approximately 200 months or longer.

Although the center of polyamide thread material and pellet remains unaffected substantially, in the cooling and granulation process of line material, the use of water is introduced into water on the surface of pellet.Conventionally, drying means removes surface water from pellet.

The first pellet Rotary drying cell location is to receive wet pellet and water from wet cutting comminutor.Pellet can fall, or scans out or be sent in the first pellet Rotary drying unit.

The first pellet Rotary drying unit is generally by remain on pellet in sieve cage and operate to remove water by centrifugal force rotation pellet simultaneously.Hole in sieve have allow water by but pellet is remained on to the hole dimension in drying unit.Can use the center rotor rotation pellet with impeller blade.Impeller blade also can move through pellet drier and move to the second fluid bed drying unit.Stream by pellet for example, by dry gas (, dry air, dry nitrogen, or their combination) rotates.

Although can use dry air that polyamide pellet is dry, the dry inert gas (for example, the air of nitrogen or enriched in nitrogen) that uses dry inert gas or have an oxygen content of minimizing can reduce oxidation.

Can exist in the porch of the first Rotary drying unit agglomerate to filter out pellet, gel and other undesirable particle of caking.This sieve can prevent from having and be greater than about 4cm, or is greater than about 3.5cm, or is greater than about 3cm, or is greater than about 2.5cm, or is greater than about 2cm, or is greater than entering of the length of about 1.5cm or the particle of width.

The atmospheric pressure of rotary dryer can change.For example, rotary dryer can remain under decompression or supercharging.Decompression can comprise that atmospheric pressure reduces 6KPa-14KPa or more.For example, the standard atmospheric pressure that replaces about 760mm Hg (holder), pressure in rotary dryer unit in the dry run of pellet can be less than about 700mm Hg, or be less than about 600mm Hg, or be less than about 500mm Hg, or be less than about 400mm Hg, or be less than about 300mm Hg, or be less than about 200mm Hg, or be less than about 100mm Hg.For example, rotary dryer can be by pellet the drying under reduced pressure at about 300-400mm Hg.

Temperature in rotary dryer can be at approximately 35 ℃ to approximately 200 ℃, or approximately 40 ℃ to approximately 175 ℃, or approximately 45 ℃ to approximately 150 ℃, or in the scope of approximately 50 ℃ to approximately 125 ℃.Lower temperature can reduce flavescence but also can increase drying time.

Can be by the dry time that is enough to remove most of water of pellet.This Time Dependent in the variable of baking temperature and other as water and will be dry the volume of pellet.

The time that removes enough water can change.Rotary dryer and fluidized bed dryer generally remove and desiccated surface water.Therefore, the time of staying of pellet in these unit is less than the inner dry situation of pellet needs.Pellet can have the time of staying of any appropriate in rotary dryer, 1 second to approximately 2 hours according to appointment, or approximately 5 seconds to approximately 20 minutes, or approximately 1 second or shorter, or about 5s, 10,15,20,25,30,35,40,45,50,55,60s, 1.5 minutes, 2,3,4,5,6,7,8,9,10,30 minutes, 1 hour or approximately 2 hours or longer.

Rotary dryer can be the rotary dryer of any appropriate, as derived from Minneapolis, and the rotary dryer of the Carter Day of MN, as Carter Day Spinaway drier, or Carter Day Pressurized Spinaway drier.Rotary dryer can have the output of any appropriate, 1L/ minute to about 5000L/ minute according to appointment, about 5L/ minute to about 1000L/ minute, about 10L/ minute to about 100L/ minute, or about 1L/ minute or shorter, or 2L/ minute, 3,4,5,10,15,20,25,50,100,150,200,250,500,750,1000,2000,3000,4000 or about 5000L/ minute or longer.Rotary dryer can be at the pellet of dry any suitable amount of unit interval, 1000 pellets/minute to approximately 10,000 according to appointment, and 000 pellet/minute, approximately 10,000 pellets/minute to approximately 5,000,000 pellet/minute, or approximately 1000 pellets/minute below, or approximately 2000,5000,10,000,20,000,50,000,100,000,250,000,500,000,1,000,000,5,000,000 or approximately 10,000,000 pellet/minute.Rotary dryer can the RPM rotation with any appropriate by pellet, and 20RPM is to approximately 500 according to appointment, 000RPM, or approximately 1,000RPM is to approximately 200,000RPM, or about 20RPM or slower, or about 50RPM, 100,150,200,250,500,750,1,000,2,000,3,000,4,000,5,000,7,500,10,000,15,000,20,000,25,000,50,000,100,000,150,000,200,000 or approximately 500,000 or faster.Pellet can be exposed to the air blowing or have the gas of speed and the temperature in any appropriate of any appropriate in rotary dryer, 20 ℃ to approximately 300 ℃ according to appointment, or approximately 30 ℃ to approximately 200 ℃, or approximately 20 ℃ or lower, or approximately 30 ℃, 40,50,75,100,125,150,175,200,225,250,275 or approximately 300 ℃ or higher.The total water content that leaves the pellet of rotary dryer can be total water content of any appropriate, 0.1 % by weight is to approximately 10 % by weight according to appointment, or approximately 1 % by weight to approximately 5 % by weight, or approximately 0.1 % by weight or lower, or approximately 0.5 % by weight, 1,2,3,4,5,6,7,8,9 or approximately 10 % by weight or higher.The standard deviation of percentage by weight of total water content of leaving the pellet of rotary dryer can be the standard deviation of any appropriate, 0.001 % by weight is to approximately 1 % by weight according to appointment, or approximately 0.001 % by weight to approximately 0.5 % by weight, or approximately 0.001 % by weight or lower, or approximately 0.005 % by weight, 0.01,0.05,0.1,0.5 or approximately 1 % by weight or higher.

Rotary dryer removes most of water from pellet.The water that most (if not all) is removed is surface water.For example, pellet Rotary drying unit can remove up to 80% from pellet, or up to 82%, or up to 83%, or up to 85%, or up to 86%, or up to 88%, or up to 90%, or up to 91%, or up to 92%, or up to 93%, or up to 94%, or up to 95% water.When pellet leaves pellet Rotary drying unit, pellet has and is less than approximately 15 % by weight, or is less than approximately 12 % by weight, or be less than approximately 10 % by weight, or be less than approximately 8 % by weight, or be less than approximately 7 % by weight, or be less than approximately 6 % by weight, or be less than approximately 5 % by weight, or be less than approximately 4 % by weight, or be less than approximately 3 % by weight, or be less than approximately 2 % by weight, or be less than the water of approximately 1 % by weight, or be less than approximately 0.8 % by weight, or be less than the water of approximately 0.5 % by weight.After the removing of the water of this amount, pellet is sent in fluidized bed drying unit.

Fluidized bed drying cell location is for receiving the pellet from pellet Rotary drying unit.Fluidized bed dryer unit receives pellet and can be via conveyer, or by using air that pellet fluidisation on the weir at the other end place of drier is removed them from receiving area.For example, conveyer can be the conveyer belt of perforation, and its middle punch is enough greatly to allow passing through but being less than pellet of gaseous flow.Conveyer also can vibrate pellet.This vibration can reduce the caking of pellet.In some instances, can use air from the heated drying of perforated plate below by pellet fluidisation until the height of fluidisation pellet allows pellet to drop on the weir of far-end of unit (opposite entrance), this can help avoid the maintenance of conveyer belt, as repaired the maintenance of the obstruction being caused by unusual pellet.

By pellet by the gaseous flow of lifting separated pellet from fluidisation below.Gaseous flow can be air, nitrogen or their combination.For example, gaseous flow can be the air filtering of crossing being dried.As above regard to that rotary dryer points out, although dry air is generally used for dry polyamide pellet, the dry inert gas (for example, the air of nitrogen or enriched in nitrogen) that uses dry inert gas or have an oxygen content of minimizing can reduce oxidation.Fluidized bed drying unit also can adopt dry air, or the atmosphere of the air of nitrogen or enriched in nitrogen.

The example of suitable fluidized bed dryer comprises those that produced by the washingtonian Witte Company in New Jersey (referring to, the website at witte.com/products/fbdryer.php place).Also can use vibrating fluid bed dryer, for example, be generally used for being dried the type for the coated tablet of pharmacy application.This fluidized bed dryer is commercially available comprises Nicomacsrl from a plurality of manufacturers, Via Curiel, 12,20060 Liscate, Milan, Italy.

Also gaseous flow can be heated to promote the dry of pellet.For example, pellet temperature at approximately 80 ℃ to approximately 150 ℃ in the fluidisation stream of air can be heated.Alternatively, the temperature in fluidized bed drying unit can be at approximately 35 ℃ to approximately 200 ℃, or approximately 40 ℃ to approximately 175 ℃, or approximately 45 ℃ to approximately 150 ℃, or in the scope of approximately 50 ℃ to approximately 125 ℃.Lower temperature can reduce flavescence but also can increase drying time.

The air pressure of fluidized bed drying unit also can change.For example, fluidized bed drying unit can be remained under decompression or supercharging.More than decompression can comprise that atmospheric pressure reduces 50-100 holder.For example, the standard atmospheric pressure that replaces about 760mm Hg (holder), pressure in fluidized bed drying unit in the dry run of pellet can be less than about 700mm Hg, or be less than about 600mm Hg, or be less than about 500mm Hg, or be less than about 400mm Hg, or be less than about 300mm Hg, or be less than about 200mm Hg, or be less than about 100mm Hg.For example, fluidized bed drying unit can be by pellet the drying under reduced pressure at about 300-400mm Hg.

In fluidized bed drying unit, the time of dried granules can change.Fluidized bed drying unit is the surface of dried granules substantially also, and it can need the time fewer than the inside of dried granules.Pellet can have the time of staying of any appropriate in fluidized bed dryer, 1 second to approximately 4 hours according to appointment, or approximately 5 seconds to approximately 20 minutes, or approximately 1 second or shorter, or about 5s, 10,15,20,25,30,35,40,45,50,55,60s, 1.5 minutes, 2,3,4,5,6,7,8,9,10,30 minutes, 1 hour, 2,3 or approximately 4 hours or longer.

Fluidized bed drying unit can comprise grader unit.Grader unit allows to remove has difform " particulate " (for example, by the particulate of 20 mesh sieves) arbitrarily, comprises those that keep statically.For example, grader can remove band, bar, fine and other particulate.

Fluidized bed dryer can have the output of any appropriate, 1L/ minute to about 5000L/ minute according to appointment, about 5L/ minute to about 1000L/ minute, about 10L/ minute to about 100L/ minute, or about 1L/ minute or lower, or 2L/ minute, 3,4,5,10,15,20,25,50,100,150,200,250,500,750,1000,2000,3000,4000, or about 5000L/ minute or higher.Fluidized bed dryer can be at the pellet of dry any suitable amount of unit interval, 1000 pellets/minute to approximately 10,000 according to appointment, and 000 pellet/minute, approximately 10,000 pellets/minute to approximately 5,000,000 pellet/minute, or approximately 1000 pellets/minute or lower, or approximately 2000,5000,10,000,20,000,50,000,100,000,250,000,500,000,1,000,000,5,000,000, or approximately 10,000,0000 pellet/minute.Pellet can be exposed in fluidized bed dryer to the air blowing or there is the gas of the speed of any appropriate, so that form fluid bed.Air in fluidized bed dryer or gas can have the temperature of any appropriate, 20 ℃ to approximately 300 ℃ according to appointment, or approximately 30 ℃ to approximately 200 ℃, or below approximately 20 ℃, or approximately 30 ℃, more than 40,50,75,100,125,150,175,200,225,250,275 or approximately 300 ℃.The pellet that leaves fluidized bed dryer can be finished product pellet.

Finished product pellet can usually be dried equably, there is no the difference on interior contrast surface water content.Dry polyamide pellet is passable, for example, has and is less than 0.5 % by weight, is less than 0.4 % by weight, is less than 0.3 % by weight, is less than 0.2 % by weight, is less than 0.1 % by weight, is less than 0.05 % by weight, or is less than the water content of 0.02 % by weight.Dry polyamide pellet product also can have lower than approximately 1.5%, or lower than approximately 1.0%, or lower than approximately 0.5% volatile content.The total water content that leaves the pellet of fluidized bed dryer can be total water content of any appropriate, 0.01 % by weight is to approximately 5 % by weight according to appointment, or approximately 0.01 % by weight to approximately 2 % by weight, or approximately 0.01 % by weight or lower, or approximately 0.05 % by weight, 0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1,1.2,1.4,1.6,1.8,2,2.5,3,3.5,4,4.5 % by weight or approximately 5 % by weight or higher.The standard deviation of percentage by weight of total water content of leaving the pellet of fluidized bed dryer can be the standard deviation of any appropriate, according to appointment 0.000,1 % by weight is to approximately 0.5 % by weight, or approximately 0.001 % by weight to approximately 0.1 % by weight, or approximately 0.000,1 % by weight or lower, or approximately 0.005 % by weight, 0.01,0.05,0.1,0.2,0.3,0.4 % by weight, or approximately 0.5 % by weight or higher.

Total water content of finished product pellet can be total water content of any appropriate, 0.01 % by weight is to approximately 5 % by weight according to appointment, or approximately 0.01 % by weight to approximately 2 % by weight, or approximately 0.01 % by weight or lower, or approximately 0.05 % by weight, 0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1,1.2,1.4,1.6,1.8,2,2.5,3,3.5,4,4.5 % by weight, or approximately 5 % by weight or higher.The standard deviation of the percetage by weight of total water content of finished product pellet can be the standard deviation of any appropriate, according to appointment 0.000,1 % by weight is to approximately 0.5 % by weight, or approximately 0.001 % by weight to approximately 0.1 % by weight, or approximately 0.000,1 % by weight or lower, or approximately 0.005 % by weight, 0.01,0.05,0.1,0.2,0.3,0.4 % by weight, or approximately 0.5 % by weight or higher.The yellowness index of finished product pellet can be the yellowness index of any appropriate, and can be by the method for any appropriate, as ASTM D1925 or ASTM E313 measurement, according to appointment 0.001 to approximately 50, approximately 0.01 to approximately 20, approximately 0.1 to approximately 15, or approximately 0.001 or lower, 0.01,0.1,0.5,1,1.5,2,2.5,3,3.5,4,4.5,5,5.5,6,6.5,7,7.5,8,8.5,9,9.5,10,11,12,13,14,15,20,25,30,40, or approximately 50 or higher.The oxidative degradation index (ODI) of finished product pellet can be the ODI of any appropriate, according to appointment 0.01 to approximately 0.9, or approximately 0.1 to approximately 0.5, or approximately 0.01,0.05,0.1,0.15,0.2,0.25,0.3,0.35,0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.75,0.8,0.85, or approximately 0.9 or higher.The thermal degradation index (TDI) of finished product pellet can be the TDI of any appropriate, according to appointment 0.01 to approximately 0.9, or approximately 0.1 to approximately 0.5, or approximately 0.01,0.05,0.1,0.15,0.2,0.25,0.3,0.35,0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.75,0.8,0.85, or approximately 0.9 or higher.

Example polyamide drying system

Fig. 1 shows example polyamide pellet drying system.This system can comprise rotary dryer unit 10, and it has the reception chute for polyamide pellet 20.Pellet rotates to produce the centrifugal water 50 that removes in rotating flow 30.Pellet keeps sieve 60 that pellet is remained in rotary dryer unit 10, and by dry pellet with to comprise that water removes the water discharge system of delivery pipe 70 isolated.Rotary dryer has the wheel shaft 80 that is operationally configured to rotate pellet maintenance sieve 60.Rotary dryer unit 10 has the upwards gaseous flow 40 moving upward that supports when they are dry and promote pellet.At water 50, after the part of pellet removes, they are sent in the receiving area, fluidized bed drying unit 90 of fluidized bed drying unit 100.Fluidized bed drying unit 100 transmits pellet to leave receiving area 9`0 via the conveyer 120 that may be operably coupled to conveyer motor 130.Gaseous flow 110 upwards flows through conveyer 120.Conveyer 120 also vibrates pellet, and this can reduce caking.Dry pellet is delivered to dried granules case 140.

Can use system and method described herein to produce or be dried nylon 6, nylon 7, nylon 11, nylon 12, nylon 6,6, nylon 6,9; Nylon 6,10, nylon 6,12, or their copolymer.

Method of testing

Thermal degradation index (TDI) is relevant the measuring of thermal history to polymer.Lower TDI refers to more inviolent in process of production temperature history.The available TDI assay method of those skilled in the art is measured polymer 1% (by weight) solution in 90% formic acid in the absorbance of the wavelength of 292nm.

Oxidative degradation index (ODI) is in its high temperature production process, to be exposed to relevant the measuring of oxidizing condition to polymer.Lower ODI refers to more not serious in process of production degraded.It is determined in the absorbance of the wavelength of 260nm by measuring polymer 1% (by weight) solution in 90% formic acid.

Relative viscosity (RV) refers in capillary viscometer in the solution of 25 ℃ of measurements and the ratio of solvent viscosity.The RV measuring by ASTM D789-06 is the basis of a test program and is the 8.4 % by weight solution of polyamide in 90% formic acid (water of 90 % by weight formic acid and 10 % by weight) the viscosity (in centipoise) and the ratio of 90% formic acid from the viscosity (in centipoise) in 25 ℃ of 25 ℃.

Definition

As used herein term " about " can permissible value or certain variable pitch of scope, for example, described value or described range limit 10% in, in 5%, or in 1%.

As used herein term " substantially " refers to major part, or mainly, as at least about 50%, 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, 99.5%, 99.9%, 99.99% or at least about more than 99.999%.

As used herein term " solvent " refers to can dissolved solid, the liquid of liquid or gas.The limiting examples of solvent is siloxanes, organic compound, water, alcohol, ionic liquid and supercritical fluid.

As used herein term " air " refers to the mixture of the gas with the composition approximately identical with the natural composition of the gas of usually obtaining from atmosphere at ground level.In some instances, air is taken from surrounding environment.Air has and comprises about 78% nitrogen, 21% oxygen, 1% argon and 0.04% carbon dioxide, and other the composition of gas in a small amount.

The value of expressing with range format should be usingd and not only comprise the numerical value of clearly narrating as the boundary of scope with flexi mode explanation, and comprises all independent numerical value or the subrange comprising within the scope of this, as each numerical value is stated the same with subrange clearly.For example, the scope of " approximately 0.1% to approximately 5% " or " approximately 0.1% to 5% " should be interpreted as not only comprising approximately 0.1% to approximately 5%, and comprise that independent value in pointed scope (for example, 1%, 2%, 3% and 4%) and subrange (for example, 0.1% to 0.5%, 1.1% to 2.2%, 3.3% to 4.4%).Unless otherwise noted, statement " about X to Y " has the implication identical with " about X is to about Y ".Equally, unless otherwise noted, statement " about X, Y or about Z " has the implication identical with " about X, about Y or about Z ".

In this article, unless context clearly point out in addition, use term " ", " a kind of " or " described " to comprise one or more than one.Unless otherwise noted, use term "or" to refer to the "or" of non-removing property.In addition, should be appreciated that herein adopt and not differently the wording of definition or term only for the object that illustrates and be nonrestrictive.The use of any paragraph heading is contemplated to and helps the understanding of article and be not interpreted as limiting; The information relevant to paragraph heading can be within special paragraph or outside occur.

The method of preparing polyamide by following examples example drying unit and this unit of use, it is contemplated to example embodiment and is nonrestrictive.

conventional method. prepare nylon 6,6 polymer and using it as fused mass the speed with about 58L/ minute by comprising the extruder of the extruder chamber with a plurality of die plate, discharge to produce the nylon wire material of granulation subsequently.Extruder chamber has 10 die plate, and each has 30 capillaries, and each capillary is corresponding to the line material of extruding.Line material for example, from capillary (, die holes) with the speed of the about 6.83M/ of each capillary minute out.Line material out there is 6mm diameter, the temperature of 270 ℃, and approximately 0.1% overall weight percent water, it is mainly internal water.

Embodiment 1: drying-granulating machine.

Provide below conventional method.Line material marches to drying-granulating machine, and it is cut into the long pellet of 2.5mm by line material with the speed of approximately 4.8 hundred ten thousand pellets per minute.

Comminutor approximately every 2 weeks needs cuts out for clean and sharpening.The pellet fusion of about 0.000,1 % by weight.

Embodiment 2: wet granulation, use conveyer belt drier.

Provide below conventional method.Line material marches to wet comminutor, derives from the WSD series comminutor of Bay Plastics Machine (Bay City, MI), and it is cut into the long pellet of 2.5mm by line material with the speed of approximately 4.8 hundred ten thousand pellets per minute.Pellet is covered with water.

Speed with approximately 4.8 hundred ten thousand pellets per minute after pellet enters conveyer belt drier.When pellet enters conveyer belt drier, they have total moisture content of approximately 10 % by weight and the temperature of approximately 80 ℃.Conveyer belt drier has the shuttle belt that keeps pellet, wherein to 100 ℃ of air of blowing up, passes through pellet.Yet, do not form fluid bed.Pellet is kept in drier approximately 5 minutes.Pellet leaves drier with the speed of approximately 4.8 hundred ten thousand pellets per minute.Finished product pellet has total moisture content (standard deviation with approximately 0.2 % by weight) of approximately 0.7 % by weight, and the temperature of approximately 90 ℃.

Wet cutting comminutor approximately every 2 months needs cuts out for clean and sharpening.The pellet fusion of about 0.000,02 % by weight.Finished product pellet has approximately 4 the yellowness index of measuring according to ASTM D1925.Finished product pellet has 0.35 thermal degradation index, and 0.3 oxidative degradation index.

Embodiment 3a: wet granulation, use rotary dryer.

Pellet enters Carter Day Spinaway rotary dryer with the speed of approximately 4.8 hundred ten thousand pellets per minute.When pellet enters rotary dryer, they have total moisture content of approximately 10 % by weight and the temperature of approximately 80 ℃.Rotary dryer by pellet with about 500RPM rotation and pellet is exposed to 100 ℃ of air that are blown into.Pellet is remained in rotary dryer to the average time of approximately 5 minutes.Finished product pellet has total moisture content (standard deviation with approximately 0.2 % by weight) of approximately 0.7 % by weight, and has the temperature of approximately 90 ℃.

Embodiment 3b: wet granulation, use lower transmission fluid bed pellet drier.

Speed with approximately 4.8 hundred ten thousand pellets per minute after pellet enters the fluidized bed dryer of being produced by the washingtonian Witte Company in New Jersey.When pellet enters fluidized bed dryer, they have total moisture content of approximately 10 % by weight and the temperature of approximately 80 ℃.Fluidized bed dryer has the shuttle belt that keeps pellet, wherein to 100 ℃ of air of blowing up, passes through pellet, forms the Air Fluidized bed of pellet.Pellet is remained in fluidized bed dryer to approximately 5 minutes.Pellet leaves fluidized bed dryer with the speed of approximately 4.8 hundred ten thousand pellets per minute.Finished product pellet has total moisture content (standard deviation with approximately 0.2 % by weight) of approximately 0.5 % by weight, and has the temperature of approximately 90 ℃.

Wet cutting comminutor approximately every 2 months needs cuts out for clean and sharpening.The pellet fusion of about 0.000,02 % by weight.Finished product pellet has approximately 5 the yellowness index of measuring according to ASTM D1925.Finished product pellet has 0.4 thermal degradation index, and 0.5 oxidative degradation index.

Embodiment 4: wet granulation, and use Rotary drying and use conveyer belt drier.

Pellet enters Carter Day Spinaway rotary dryer with the speed of approximately 4.8 hundred ten thousand pellets per minute.When pellet enters rotary dryer, they have total moisture content of approximately 10 % by weight and the temperature of approximately 80 ℃.Rotary dryer by pellet with about 500RPM rotation and pellet is exposed to 100 ℃ of air that are blown into.Pellet is remained in rotary dryer to the average time of approximately 30 seconds.

Speed with approximately 4.8 hundred ten thousand pellets per minute after pellet enters conveyer belt drier.When pellet enters conveyer belt drier, they have total moisture content of approximately 0.4 % by weight and the temperature of approximately 90 ℃.Conveyer belt drier has the shuttle belt that keeps pellet, wherein to 100 ℃ of air of blowing up, passes through pellet.Yet, do not form fluid bed.Pellet is kept in drier approximately 2 minutes.Pellet leaves drier with the speed of approximately 4.8 hundred ten thousand pellets per minute.Finished product pellet has total moisture content (standard deviation with approximately 0.2 % by weight) of approximately 0.35 % by weight, and has the temperature of approximately 90 ℃.

Embodiment 5: wet granulation, use rotary dryer and lower transmission fluid bed pellet drier, and in rotary dryer, use 210 ℃.

Pellet enters Carter Day Spinaway rotary dryer with the speed of approximately 4.8 hundred ten thousand pellets per minute.When pellet enters rotary dryer, they have total moisture content of approximately 10 % by weight and the temperature of approximately 80 ℃.Rotary dryer by pellet with about 500RPM rotation and pellet is exposed to 210 ℃ of air that are blown into.Pellet is remained in rotary dryer to the average time of approximately 20 seconds.

Speed with approximately 4.8 hundred ten thousand pellets per minute after pellet enters the fluidized bed dryer of being produced by the washingtonian Witte Company in New Jersey.When pellet enters fluidized bed dryer, they have total moisture content of approximately 0.4 % by weight and the temperature of approximately 150 ℃.Fluidized bed dryer has the shuttle belt that keeps pellet, wherein to 100 ℃ of air of blowing up, passes through pellet, forms the Air Fluidized bed of pellet.Pellet is remained in fluidized bed dryer to approximately 30 seconds.Pellet leaves fluidized bed dryer with the speed of approximately 4.8 hundred ten thousand pellets per minute.Finished product pellet has total moisture content (standard deviation with approximately 0.02 % by weight) of approximately 0.05 % by weight, and has the temperature of approximately 90 ℃.

Wet cutting comminutor approximately every 2 months needs cuts out for clean and sharpening.The pellet fusion of about 0.000,02 % by weight.Finished product pellet has approximately 20 the yellowness index of measuring according to ASTM D1925.Finished product pellet has 0.4 thermal degradation index, and 0.5 oxidative degradation index.Owing to the drying efficiency of fluidized bed dryer, fluidized bed dryer occupies than few approximately 30% the volume of the drying system of embodiment 2 and 4.

Embodiment 6: wet granulation, use rotary dryer and lower transmission fluid bed pellet drier, and in rotary dryer, use 150 ℃.

Pellet enters Carter Day Spinaway rotary dryer with the speed of approximately 4.8 hundred ten thousand pellets per minute.When pellet enters rotary dryer, they have total moisture content of approximately 10 % by weight and the temperature of approximately 80 ℃.Rotary dryer by pellet with about 500RPM rotation and pellet is exposed to 150 ℃ of air that are blown into.Pellet is remained in rotary dryer to the average time of approximately 25 seconds.

Speed with approximately 4.8 hundred ten thousand pellets per minute after pellet enters the fluidized bed dryer of being produced by the washingtonian Witte Company in New Jersey.When pellet enters fluidized bed dryer, they have total moisture content of approximately 0.4 % by weight and the temperature of approximately 125 ℃.Fluidized bed dryer has the shuttle belt that keeps pellet, wherein to 100 ℃ of air of blowing up, passes through pellet, forms the Air Fluidized bed of pellet.Pellet is remained in fluidized bed dryer to approximately 30 seconds.Pellet leaves fluidized bed dryer with the speed of approximately 4.8 hundred ten thousand pellets per minute.Finished product pellet has total moisture content (standard deviation with approximately 0.02 % by weight) of approximately 0.15 % by weight, and has the temperature of approximately 90 ℃.

Wet cutting comminutor approximately every 2 months needs cuts out for clean and sharpening.The pellet fusion of about 0.000,02 % by weight.Finished product pellet has approximately 4 the yellowness index of measuring according to ASTM D1925.Finished product pellet has 0.37 thermal degradation index, and 0.35 oxidative degradation index.Owing to the drying efficiency of fluidized bed dryer, fluidized bed dryer occupies than few approximately 30% the volume of the drying system of embodiment 2 and 4.

Embodiment 7: wet granulation, use rotary dryer and lower transmission fluid bed pellet drier, and in fluidized bed dryer, use 210 ℃.

Speed with approximately 4.8 hundred ten thousand pellets per minute after pellet enters the fluidized bed dryer of being produced by the washingtonian Witte Company in New Jersey.When pellet enters fluidized bed dryer, they have total moisture content of approximately 0.4 % by weight and the temperature of approximately 90 ℃.Fluidized bed dryer has the shuttle belt that keeps pellet, wherein to 210 ℃ of air of blowing up, passes through pellet, forms the Air Fluidized bed of pellet.Pellet is remained in fluidized bed dryer to approximately 20 seconds.Pellet leaves fluidized bed dryer with the speed of approximately 4.8 hundred ten thousand pellets per minute.Finished product pellet has total moisture content (standard deviation with approximately 0.02 % by weight) of approximately 0.05 % by weight and has the temperature of approximately 150 ℃.

Embodiment 8: wet granulation, use rotary dryer and lower transmission fluid bed pellet drier, and in fluidized bed dryer, use 150 ℃.

Conventional method provides below.Line material marches to wet comminutor, derives from the WSD series comminutor of Bay Plastics Machine (Bay City, MI), and it is cut into the long pellet of 2.5mm by line material with the speed of approximately 4.8 hundred ten thousand pellets per minute.Pellet is covered with water.

Speed with approximately 4.8 hundred ten thousand pellets per minute after pellet enters the fluidized bed dryer of being produced by the washingtonian Witte Company in New Jersey.When pellet enters fluidized bed dryer, they have total moisture content of approximately 0.4 % by weight and the temperature of approximately 90 ℃.Fluidized bed dryer has the shuttle belt that keeps pellet, wherein to 150 ℃ of air of blowing up, passes through pellet, forms the Air Fluidized bed of pellet.Pellet is remained in fluidized bed dryer to approximately 25 seconds.Pellet leaves fluidized bed dryer with the speed of approximately 4.8 hundred ten thousand pellets per minute.Finished product pellet has total moisture content (standard deviation with approximately 0.02 % by weight) of approximately 0.15 % by weight and has the temperature of approximately 125 ℃.

Embodiment 9: wet granulation, use rotary dryer and lower transmission fluid bed pellet drier

Speed with approximately 4.8 hundred ten thousand pellets per minute after pellet enters the fluidized bed dryer of being produced by the washingtonian Witte Company in New Jersey.When pellet enters fluidized bed dryer, they have total moisture content of approximately 0.4 % by weight and the temperature of approximately 90 ℃.Fluidized bed dryer has the shuttle belt that keeps pellet, wherein to 100 ℃ of air of blowing up, passes through pellet, forms the Air Fluidized bed of pellet.Pellet is remained in fluidized bed dryer to approximately 30 seconds.Pellet leaves fluidized bed dryer with the speed of approximately 4.8 hundred ten thousand pellets per minute.Finished product pellet has total moisture content (standard deviation with approximately 0.02 % by weight) of approximately 0.15 % by weight and has the temperature of approximately 90 ℃.

Wet cutting comminutor approximately every 2 months needs cuts out for clean and sharpening.The pellet fusion of about 0.000,02 % by weight.Finished product pellet has approximately 1.5 the yellowness index of measuring according to ASTM D1925.Finished product pellet has 0.30 thermal degradation index, and 0.20 oxidative degradation index.Owing to the drying efficiency of fluidized bed dryer, fluidized bed dryer occupies than few approximately 30% the volume of the drying system of embodiment 2 and 4.

Embodiment 10: wet granulation, use rotary dryer and the lower transmission fluid bed pellet drier that uses the dry gas of oxygen minimizing.

Pellet enters Carter Day Spinaway rotary dryer with the speed of approximately 4.8 hundred ten thousand pellets per minute.When pellet enters rotary dryer, they have total moisture content of approximately 10 % by weight and the temperature of approximately 80 ℃.Rotary dryer rotates pellet and pellet is exposed to about 500RPM the air (50% nitrogen, 50% air) of 100 ℃ of enriched in nitrogen that are blown into.Pellet is remained in rotary dryer to the average time of approximately 30 seconds.

Speed with approximately 4.8 hundred ten thousand pellets per minute after pellet enters the fluidized bed dryer of being produced by the washingtonian Witte Company in New Jersey.When pellet enters fluidized bed dryer, they have total moisture content of approximately 0.4 % by weight and the temperature of approximately 90 ℃.Fluidized bed dryer has the shuttle belt that keeps pellet, and wherein the air (50% nitrogen, 50% air) to 100 ℃ of enriched in nitrogen of blowing up passes through pellet, forms the Air Fluidized bed of pellet.Pellet is remained in fluidized bed dryer to approximately 30 seconds.Pellet leaves fluidized bed dryer with the speed of approximately 4.8 hundred ten thousand pellets per minute.Finished product pellet has total moisture content (standard deviation with approximately 0.02 % by weight) of approximately 0.15 % by weight and has the temperature of approximately 90 ℃.

Wet cutting comminutor approximately every 2 months needs cuts out for clean and sharpening.The pellet fusion of about 0.000,02 % by weight.Finished product pellet has approximately 1.4 the yellowness index of measuring according to ASTM D1925.Finished product pellet has 0.30 thermal degradation index, and 0.18 oxidative degradation index.Owing to the drying efficiency of fluidized bed dryer, fluidized bed dryer occupies than few approximately 30% the volume of the drying system of embodiment 2 and 4.

All patents of quoting herein or mentioning and be openly the indication of theme one of ordinary skill in the art's of the present invention level, and each this quoted patent or open be therefore bonded to particularly by reference with individually by reference with its all in conjunction with or herein, provide the degree that its full content is identical.Applicant retains and will physically be bonded to the right in this description from any this patent of quoting or disclosed any and all materials and information.

Concrete method described herein, device and composition are the representatives of preferred embodiment and are examples and do not expect as restriction to the scope of theme of the present invention.After considering this description those skilled in the art can expect other object, aspect and embodiment, and included by theme of the present invention.What one skilled in the art will readily appreciate that is can the present invention disclosed herein be carried out multiple replacement and change and do not departed from the scope of the present invention and spirit.

The theme of the present invention of schematically describing herein can be not have any one or more key elements aptly, or implements in the situation of one or more restrictions, and it is necessary not open particularly herein.The Method and Process of schematically describing herein can be implemented with the order of different steps aptly, and Method and Process is not necessarily limited to herein or the order of the step of pointing out in claim.

Under any circumstance this patent all cannot be interpreted as being defined in herein disclosed instantiation or embodiment or method particularly.Under any circumstance this patent all cannot be interpreted as by appointing any other official or any statement made of employee watch auditor or patent and trademark office to limit, unless adopted clearly this statement particularly and without restriction or reservation in applicant's written reply.

The term adopting and expression are used as illustrative term and are not restrictive; and do not wish to get rid of any equivalent or its part given and feature that describe in the use of this term and expression; but it should be understood that; in the scope of the present invention for required protection, a plurality of modifications are possible.Therefore, will understand is that, although the present invention discloses particularly by preferred embodiment and optional feature, the modifications and variations of concept disclosed herein can be taked by those skilled in the art, and this modifications and variations are considered to be in the scope of the present invention being limited by appended claim of the present invention and statement.

The present invention broadly and has usually been described herein.Drop on general open interior each narrower species and subclass group and also form a part of the present invention.This comprises having the general remark of the present invention that removes restriction or the reverse side restriction of any theme from a class, and with whether point out particularly got rid of material herein has nothing to do.In addition, in the situation that with the term description feature of the present invention of Ma Kushi group or aspect, thereby it will be apparent to one skilled in the art that the present invention is also with the member's of Ma Kushi group any independent member or the term description of subgroup.

Statement:

1. for the production of a system for polyamide pellet, described system comprises:

B) fluidized bed dryer, described fluidized bed dryer is dried and sends described partly dry pellet from described rotary dryer to produce dry polyamide pellet.

2. state the system described in 1, described system also comprises extruder, and described extruder is configured to produce prepares the polyamide thread material of described wet polyamide pellet by it.

3. state the system described in 1 or 2, described system also comprises extruder, and described extruder is configured to produce has approximately 0.01% to 0.5%, or approximately 0.05% to 0.3%, or the line material of the polyamide of the water of approximately 0.1% to 0.25% percetage by weight.

4. the system described in any one in statement 1-3, wherein has the temperature of about 200-300 ℃ from the line material of the polyamide out of the extruder described system.

5. the system described in any one of statement in 1-4, described system also comprises for cooling prepares the water cooling system of the polyamide extruded line material of described wet polyamide pellet by it.

6. the system described in any one of statement in 1-5, described system also comprises wet cutting comminutor, the line material that described wet cutting comminutor is configured to cut polyamide in water is to produce described wet polyamide pellet.

7. the system described in any one of statement in 1-6, wherein said wet polyamide pellet has water layer or in having the form of the slurries of water on their outside.

8. the system described in any one of statement in 1-7, wherein said wet polyamide pellet has approximately 1 % by weight to 50 % by weight, or approximately 1 % by weight to 40 % by weight, or approximately 2 % by weight to 30 % by weight, or the water of the percetage by weight of approximately 3 % by weight to 20 % by weight.

9. the system described in any one of statement in 1-8, wherein wet polyamide pellet has approximately 20 ℃ to approximately 200 ℃, or approximately 30 ℃ to approximately 150 ℃, or the temperature of approximately 35 ℃ to approximately 100 ℃.

10. the system described in any one of statement in 1-9, wherein said wet polyamide pellet has acceptable yellowness index.

System described in any one in 11. statement 1-10, described system is configured to wet polyamide pellet to be delivered to described rotary dryer from comminutor.

System described in any one in 12. statement 1-11, wherein said rotary dryer removes water from described pellet is centrifugal.

System described in any one in 13. statement 1-12, wherein said rotary dryer comprises for keep sieve or the basket of described pellet when removing water.

System described in any one in 14. statement 1-13, wherein said rotary dryer comprises the center rotor with impeller blade.

System described in any one of 15. statements in 1-14, wherein said rotary dryer comprises the gaseous flow of pellet described in lifting.

System described in any one in 16. statement 1-15, wherein said rotary dryer also comprises heater.

System described in any one in 17. statement 1-16, wherein said rotary dryer also comprises heater, described heater is configured to the pellet in described rotary dryer to be maintained at about 25 ℃ to approximately 200 ℃, or approximately 30 ℃ to approximately 180 ℃, or approximately 30 ℃ to approximately 150 ℃, or the temperature of approximately 30 ℃ to approximately 100 ℃.

System described in any one of 18. statements in 1-17, the pellet that described system is configured to generating portion and is dried, described partly dry pellet is when they have the pellet temperature lower than described polyamide pellet melt temperature out time from described rotary dryer.

System described in any one of 19. statements in 1-18, wherein said fluidized bed dryer is configured to receive the partly dry pellet from described rotary dryer.

System described in any one in 20. statement 1-19, wherein said partly dry pellet has approximately more than 0.3% when they enter described fluidized bed dryer, or approximately more than 0.5%, or approximately more than 1.0%, or approximately more than 2.0%, or the about water of more than 3.0% percetage by weight.

System described in any one of 21. statements in 1-20, wherein said fluidized bed dryer comprise support or fluidisation described in the gaseous flow of pellet.

System described in any one in 22. statement 1-21, wherein said fluidized bed dryer comprises for pellet being moved through to the conveyer of described fluidized bed dryer.

System described in any one in 23. statement 1-22, wherein said fluidized bed dryer comprises the conveyer of perforation, the conveyer of described perforation uses the gaseous flow that moves through described perforation.

System described in any one in 24. statement 1-23, wherein said fluidized bed dryer comprises the conveyer that rocks described pellet.

System described in any one in 25. statement 1-24, wherein said fluidized bed dryer comprises heater.

System described in any one in 26. statement 1-25, wherein said fluidized bed dryer comprises heater, described heater heats gaseous flow.

System described in any one in 27. statement 1-26, wherein said fluidized bed dryer comprises heater, and described heater is configured at approximately 25 ℃ to approximately 200 ℃, or approximately 30 ℃ to approximately 180 ℃, or approximately 30 ℃ to approximately 150 ℃, or the temperature heated gaseous of approximately 30 ℃ to approximately 100 ℃ stream.

System described in any one in 28. statement 1-27, wherein said dry pellet is when they have out time from described fluidized bed dryer approximately below 0.5%, or approximately below 0.4%, or approximately below 0.3%, or approximately below 0.2%, or the about water of the percetage by weight below 0.1%.

System described in any one in 29. statement 1-28, described system is arranged to the continuous production of polyamide pellet.

System described in any one in 30. statement 1-29, described system is configured to synthetic nylon 6, nylon 11, nylon 12, nylon 6,6; Nylon 6,9; Nylon 6,10; Nylon 6,12; Or their copolymer.

31. 1 kinds of methods, described method comprises:

A) the polyamide pellet Rotary drying that will wet, with from described wet polyamide pellet, remove most surfaces water with generating portion the pellet that is dried; With

B) described partly dry pellet is further dry to produce dry polyamide pellet in fluidized bed dryer.

Method described in 32. statements 31, described method also comprises by molten polyamide generation polyamide thread material.

The system of 33. statements described in 31 or 32, described system also comprises the line material of extruding to be enough to substantially to avoid the polyamide that the line material spacing distance of line material fusion separates.

Method described in any one of 34. statements in 31-33, described method also comprises polyamide thread material is hung under the condition of described polyamide thread material that is enough to harden, thereby produces the line material of sclerosis.

Method described in any one in 35. statement 31-34, described method also comprises that generation has the polyamide thread material of approximately 5 average diameters to 6.5mm.

Method described in any one in 36. statement 31-35, described method also comprises producing to have approximately 0.01% to 0.5%, or approximately 0.05% to 0.3%, or approximately 0.1% to 0.25%, or the polyamide thread material of the water of approximately 0.05% to 0.25% percetage by weight.

Method described in any one in 37. statement 31-36, described method also comprises the polyamide thread material that produces the temperature with about 200-300 ℃.

Method described in any one in 38. statement 31-37, described method also comprises polyamide thread material water cooling.

Method described in any one in 39. statement 31-38, wherein said wet polyamide pellet is in having the form of the slurries of water.

Method described in any one in 40. statement 31-39, wherein said wet polyamide pellet is covered with water.

Method described in any one in 41. statement 31-40, wherein said wet polyamide pellet has the internal water content of the water of approximately 0.1 percetage by weight.

Method described in any one in 42. statement 31-41, wherein said wet polyamide pellet has approximately 20 ℃ to approximately 200 ℃, or approximately 30 ℃ to approximately 150 ℃, or the temperature of approximately 35 ℃ to approximately 100 ℃.

Method described in any one in 43. statement 31-42, wherein said wet polyamide pellet has acceptable yellowness index.

Method described in any one of 44. statements in 31-43, wherein in the process of Rotary drying by water from centrifugal the removing of described wet polyamide pellet.

Method described in any one in 45. statement 31-44 wherein remains on described wet polyamide pellet in sieve or basket in Rotary drying process when Jiang Shui removes.

Method described in any one in 46. statement 31-45, wherein in Rotary drying, described wet polyamide pellet is dry in gaseous flow.

Method described in any one of 47. statements in 31-46, wherein in Rotary drying process by described wet polyamide pellet at approximately 25 ℃ to approximately 200 ℃, or approximately 30 ℃ to approximately 180 ℃, or approximately 30 ℃ to approximately 150 ℃, or the temperature of approximately 30 ℃ to approximately 100 ℃ heats.

Method described in any one in 48. statement 31-47, described in wherein after Rotary drying, partly dry pellet has approximately more than 0.3%, or approximately more than 0.5%, or approximately more than 1.0%, or approximately more than 2.0%, or the about water of more than 3.0% percetage by weight.

Method described in any one of 49. statements in 31-48, wherein said partly dry pellet by described fluidized bed dryer, support or fluidisation described in the gaseous flow of pellet support or fluidisation.

Method described in any one of 50. statements in 31-49, described in wherein making, partly dry pellet moves through described fluidized bed dryer on conveyer.

Method described in any one of 51. statements in 31-50, described in wherein making, partly dry pellet moves through described fluidized bed dryer on the conveyer of perforation, and the conveyer of described perforation uses the gaseous flow that moves through perforation.

Method described in any one of 52. statements in 31-51, wherein when described partly dry pellet vibrates them when the conveyer in described fluidized bed dryer moves.

Method described in any one of 53. statements in 31-52 wherein heats described partly dry pellet in described fluidized bed dryer.

Method described in any one in 54. statement 31-53, wherein in described fluidized bed dryer by described partly dry pellet at approximately 25 ℃ to approximately 200 ℃, or approximately 30 ℃ to approximately 180 ℃, or approximately 30 ℃ to approximately 150 ℃, or the temperature of approximately 30 ℃ to approximately 100 ℃ heating.

Method described in any one in 55. statement 31-54, wherein said dry pellet has approximately 0.1%, or approximately 0.2%, or approximately 0.3%, or approximately 0.4%, or the water of approximately 0.5% percetage by weight.

Method described in any one in 56. statement 31-55, wherein said pellet is being produced in polyamide production system continuously.

Method described in any one in 57. statement 31-56, wherein said polyamide is nylon 6, nylon 11, nylon 12, nylon 6,6; Nylon 6,9; Nylon 6,10; Nylon 6,12; Or their copolymer.

Following claim is summed up the feature of system and method described herein.

Claims

2. system according to claim 1, described system also comprises extruder, described extruder is configured to produce prepares the polyamide thread material of described wet polyamide pellet by it.

3. system according to claim 1, described system also comprises for cooling prepares the water cooling system of the polyamide extruded line material of described wet polyamide pellet by it.

4. system according to claim 1, described system also comprises the wet cutting comminutor for generation of described wet polyamide pellet.

5. system according to claim 1, described system is configured to transmit described pellet on conveyer by described fluidized bed dryer.

6. system according to claim 1, wherein said fluidized bed dryer comprises the conveyer of the perforation that gaseous flow flows through therein.

7. system according to claim 1, wherein said fluidized bed dryer comprises the conveyer that rocks described pellet.