WO2020053668A1 - Dispositif et procédé de préparation de poudres séchées par pulvérisation - Google Patents

Dispositif et procédé de préparation de poudres séchées par pulvérisation Download PDF

Info

Publication number
WO2020053668A1
WO2020053668A1 PCT/IB2019/052481 IB2019052481W WO2020053668A1 WO 2020053668 A1 WO2020053668 A1 WO 2020053668A1 IB 2019052481 W IB2019052481 W IB 2019052481W WO 2020053668 A1 WO2020053668 A1 WO 2020053668A1
Authority
WO
WIPO (PCT)
Prior art keywords
dried powders
spray dried
drying chamber
pressure nozzle
low pressure
Prior art date
Application number
PCT/IB2019/052481
Other languages
English (en)
Inventor
Tapas Chatterjee
Original Assignee
Tapas Chatterjee
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tapas Chatterjee filed Critical Tapas Chatterjee
Publication of WO2020053668A1 publication Critical patent/WO2020053668A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/16—Evaporating by spraying
    • B01D1/18—Evaporating by spraying to obtain dry solids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/10—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour carrying the materials or objects to be dried with it
    • F26B3/12—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour carrying the materials or objects to be dried with it in the form of a spray, i.e. sprayed or dispersed emulsions or suspensions

Definitions

  • the invention generally relates to devices and processes for spray drying.
  • the invention relates to devices and processes for preparing spray dried powders having particle size in excess of 2000 pm.
  • Spray drying has existed as a basic materials processing operation since the late l800s.
  • the spray drying typically involves injecting a wet material in the form of droplets into a chamber and bringing the droplets in contact with a drying fluid, thereby producing a spray dried powders that is discharged from the drying chamber.
  • Injection of the wet material into the drying chamber may be done using a nozzle, atomizer, or the like.
  • the drying fluid is provided as a gas at high elevated temperature, e.g., temperatures on the order of 35-200° C.
  • spray dried powders as produced by a spray drying device have a limitation on the size of the powders thus produced.
  • spray dried powders as produced by a spray drying device have a size variation of about 50 to 400 pm.
  • a re- wet agglomeration system is adopted, in which spray dried powders are wetted with 8 to 10% water in a special wetting chamber and dried in a separate drying chamber. This process however requires a separate drying chamber, a fluidized bed dryer, which poses a series of disadvantages in terms of operation, size, cost, etc.
  • a device for preparing a spray-dried powders comprising a drying chamber defining a top end and an opposing bottom end.
  • the device further comprises a high pressure nozzle located at about the top end of the drying chamber, the high pressure nozzle being adapted to supply an atomized stream of feed liquid and primary drying gas into the drying chamber.
  • the device further comprises an outlet located at about the bottom end, the outlet being adapted to withdraw spray dried powders thus formed in the drying chamber.
  • the device further comprises a size -based classification unit adapted to receive the spray dried powders and classify the same into a first class of spray dried powders and at least one further class of spray dried powders.
  • the device further comprises a low pressure nozzle located at about the top end of the drying chamber, the low pressure nozzle being adapted to receive the at least one further class of spray dried powders, a stream of steam and optionally a secondary drying gas and supply the same to the drying chamber.
  • a process for preparing spray dried powders comprises providing a drying chamber defining a top end and an opposing bottom end.
  • the process further comprises supplying, by a high pressure nozzle located at about the top end of the drying chamber, an atomized stream of feed liquid and primary drying gas into the drying chamber.
  • the process further comprises withdrawing, by an outlet located at about the bottom end of the drying chamber, spray dried powders thus formed in the drying chamber.
  • the process further comprises classifying, by a size-based classification unit, the spray dried powders into a first class of spray dried powders and at least one further class of spray dried powders.
  • the process further comprises receiving, by a low pressure nozzle located at about the top end of the drying chamber, the at least one further class of spray dried powders, a stream of steam and optionally a secondary drying gas.
  • the process further comprises supplying, by the low pressure nozzle, the at least one further class of spray dried powders, a stream of steam and optionally a secondary drying gas to the drying chamber.
  • Figure 1 demonstrates a diagram of the device for spray drying in accordance with an embodiment of the invention.
  • Figure 2 demonstrates a flow chart of the process for preparing spray dried powders in accordance with an embodiment of the invention.
  • the device (100) comprises a drying chamber (102) defining a top end (104) and an opposing bottom end (106).
  • the device (100) further comprises a high pressure nozzle (108) is located at about the top end (104) of the drying chamber (102).
  • the high pressure nozzle (108) is adapted to supply an atomized stream of feed liquid and primary drying gas into the drying chamber (102).
  • the device (100) further comprises an outlet (110) located at about the bottom end (106).
  • the outlet (110) is adapted to withdraw spray dried powders thus formed in the drying chamber (102).
  • the device (100) further comprises a size-based classification unit (112) adapted to receive the spray dried powders and classify the same into a first class of spray dried powders and at least one further class of spray dried powders.
  • the device further comprises a low pressure nozzle (114) located at about the top end (104) of the drying chamber (102), the low pressure nozzle (114) being adapted to receive the at least one further class of spray dried powders, a stream of steam and optionally a secondary drying gas and supply the same to the drying chamber (102).
  • the device (100) further comprises a grinding unit (116) for grinding the at least one further class of spray dried powders prior to feeding the same to the low pressure nozzle (114).
  • the device (100) further comprises a transporting unit (118) adapted to transport the at least one further class of spray dried powders to the grinding unit (116) or the low pressure nozzle (114).
  • the high pressure nozzle (108) and the low pressure nozzle (114) are separated by a distance greater than 10% of the diameter of the drying chamber (102).
  • the drying chamber is provided with an expansion zone (120) at about an intermediate location and at least one gas withdrawing means (122) at the expansion zone (120) for withdrawing exhaust gas there-from.
  • the gas withdrawal means (122) is operably coupled to a solid-gas separator (124) for separating solids present in the exhaust gas.
  • the solid-gas separator (124) is operably coupled to the transporting unit (118) so as to feed the solid separated from the exhaust gas to the grinding unit (116) or the low pressure nozzle (114).
  • the high pressure nozzle (108) is operably coupled to a first pump (126) supplying the feed liquid and to a second pump (128) supplying primary drying gas.
  • the high pressure nozzle (108) is further adapted to receive a stream of steam and inject the same into the drying chamber (102).
  • the stream of steam may be mixed with the primary drying gas and introduced into the drying chamber (102). By mixing the stream of steam with the primary drying gas, the temperature of the primary drying gas can be increased.
  • a part of the primary drying gas is withdrawn as secondary drying gas and fed to the low pressure nozzle (114).
  • the low pressure nozzle (114) is operably coupled to a steam supply means (130) for receiving there-from the stream of steam.
  • the stream of steam is brought in contact with the at least one further class of spray dried powders so as to re-wet the same.
  • the secondary drying gas is optionally mixed with a stream of steam so as to increase a temperature of the secondary drying gas.
  • an additional drying means (132) for drying the spray dried powders withdrawn from the outlet (110).
  • the additional drying means (132) may receive a tertiary drying gas.
  • the tertiary drying gas may optionally include a stream of steam.
  • the additional drying means (132) may be provided with at least one gas venting means (134) for venting used gas there-from.
  • the gas venting means (134) is operably coupled to the solid-gas separator (124) for separating solids present in the used gas.
  • the additional drying means (132) may be provided between the outlet (110) and the size -based classification unit (112). In another embodiment of the invention, the additional drying means (132) and the size-based classification unit (112) may be integrated as a single entity.
  • the method (200) comprises providing (202) a drying chamber defining a top end and an opposing bottom end.
  • the method (200) further comprises supplying (204), by a high pressure nozzle located at about the top end of the drying chamber, an atomized stream of feed liquid and primary drying gas into the drying chamber.
  • the method (200) further comprises withdrawing (206), by an outlet located at about the bottom end of the drying chamber, spray dried powders thus formed in the drying chamber.
  • the method (200) further comprises classifying (208), by a size -based classification unit, the spray dried powders into a first class of spray dried powders and at least one further class of spray dried powders.
  • the method (200) further comprises receiving (210), by a low pressure nozzle located at about the top end of the drying chamber, the at least one further class of spray dried powders, a stream of steam and optionally a secondary drying gas.
  • the method (200) further comprises supplying (212), by the low pressure nozzle, the at least one further class of spray dried powders, a stream of steam and optionally a secondary drying gas to the drying chamber.
  • the method (200) may further comprise grinding (214), by a grinding unit, the at least one further class of spray dried powders prior to feeding the same to the low pressure nozzle.
  • the method (200) may further comprise withdrawing (216), exhaust gas from the drying chamber; separating (218) solids present in the exhaust gas; and transporting (220) the solids thus separated to the low pressure nozzle for feeing to the drying chamber.
  • the spray drier device produces small-sized spray dried powders, whose size can be controlled on the basis controlling the operating conditions of the drying chamber and the operating conditions of the high pressure nozzle.
  • the spray drier device produces small-sized spray dried powders having particle size in the range of 30 to 500 pm.
  • both the high pressure nozzle and the low pressure nozzle will be operated.
  • the size of the spray dried powders may be in excess of 2000 pm.
  • the process will start with the operation of the high pressure nozzle, which produces spray dried powders whose size is characterized by the operating conditions of the drying chamber and the operating conditions of the high pressure nozzle.
  • the spray dried powders thus produced will be withdrawn from the bottom of the drying chamber and fed to the low pressure nozzle.
  • the low pressure nozzle which now starts to operate in conjunction with the high pressure nozzle, will re-wet the spray dried powders thus received using the stream of steam and introduce the re-wet powders into the drying chamber.
  • the re- wet powders will agglomerate and produce big sized spray dried powders.
  • the agglomerated big sized spray dried powders are collected at the bottom.
  • a first class of spray dried powders whose size is equal to or greater than the desired size (Big Sized Spray Dried Powders) and a second class of spray dried powders whose size lesser than he desired size (Small Sized Spray Dried Powders) are produced.
  • the first class of spray dried powders is separated from the second class of spray dried powders.
  • the second class of spray dried powders is fed to the low pressure nozzle, while the first class of spray dried powders is extracted from the spray drier and packaged.
  • Example 3 Production of Small Sized Spray Dried Powders As Well As Big Sized Spray Dried Powders:
  • the small-sized spray dried powders may have size in the range of 30 to 500 pm, while the big-sized spray dried powders may have a size in excess of 2000 pm.
  • the process will start with the operation of the high pressure nozzle, which produces spray dried powders whose size is characterized by the operating conditions of the drying chamber and the operating conditions of the high pressure nozzle.
  • the spray dried powders thus produced will be withdrawn from the bottom of the drying chamber and fed to the low pressure nozzle.
  • the low pressure nozzle which now starts to operate in conjunction with the high pressure nozzle, will re-wet the spray dried powders thus received using the stream of steam and introduce the re-wet powders into the drying chamber.
  • the re-wet powders will agglomerate and produce big sized spray dried powders.
  • the agglomerated big sized spray dried powders are collected at the bottom.
  • a first class of spray dried powders whose size is equal to or greater than the desired size big-sized spray dried powders
  • a second class of spray dried powders whose size lesser than he desired size small-sized spray dried powders
  • the first class of spray dried powders is separated from the second class of spray dried powders.
  • the first class of spray dried powders (big-sized spray dried powders) is extracted from the spray drier and packaged
  • the second class of spray dried powders is split into two parts with a first part of the second class of spray dried powders being fed to the low pressure nozzle and a second part of the second class of spray dried powders being extracted from the spray drier and packaged.
  • Example 4 Production of Spray Dried Powders Having Three or More Distinct Sizes:
  • both the high pressure nozzle and the low pressure nozzle will be operated.
  • the intention may be to produce small- sized spray dried powders that may have size in the range of 30 to 500 pm, big-sized spray dried powders having size in excess of 2000 pm, and medium- sized spray dried powders whose size may be between 500 and 2000 pm (for example, 900 to 1200 pm).
  • the process will start with the operation of the high pressure nozzle, which produces small-sized spray dried powders (i.e. having particle size in the range of 30 to 500 pm).
  • a part of the small-sized spray dried powders will be withdrawn from the bottom of the drying chamber and fed to the low pressure nozzle.
  • a remaining part of the small-sized spray dried powders may be extracted from the spray drier and packaged.
  • the low pressure nozzle which now starts to operate in conjunction with the high pressure nozzle, will re-wet the small-sized spray dried powders thus received using the stream of steam and introduce the re-wet powders into the drying chamber.
  • the re-wet powders will agglomerate and produce medium-sized spray dried powders (i.e. having particle size in the range of 30 to 500 pm) and big-sized spray dried powders (i.e. having particle size in excess of 2000 pm).
  • the agglomerated medium-sized spray dried powders and big-sized particles are collected at the bottom.
  • the small-sized spray dried powders, the medium sized spray dried powders, and the big-sized spray dried powders are separated from one another.
  • a part of the small-sized spray dried powders and a part of the medium-sized spray dried powders may be extracted from the spray drier and packaged.
  • a remaining part of the small-sized spray dried powders and a remaining part of the medium-sized spray dried powders will be fed to the low pressure nozzle.
  • the low pressure nozzle will re-wet the small-sized spray dried powders and the medium sized spray dried powders thus received using the stream of steam and introduce the re-wet powders into the drying chamber.
  • This process is continued so as to produce small-sized spray dried powders that may have size in the range of 30 to 500 pm, big-sized spray dried powders having size in excess of 2000 pm, and medium-sized spray dried powders whose size may be between 500 and 2000 pm (for example, 900 to 1200 pm).
  • One of the advantages of the present invention is the capability to produce spray dried powders having a variety of sizes whose sizes can be accurately controlled. Another advantage of the present invention is that two or more sizes of spray dried powders can be simultaneously produced and thus the time period can be substantially reduced. Yet another advantage of the present invention is all the different sizes of spray dried product are provided within a single drying chamber and hence, the need to have two or more drying chambers is avoided. Because all the different sizes of spray dried product are provided within a single drying chamber, the necessity to have (a) storing units, (b) transportation units (c) controlling units and other ancillary equipments is avoided. While certain present preferred embodiments of the invention have been illustrated and described herein, it is to be understood that the invention is not limited thereto. Clearly, the invention may be otherwise variously embodied, and practiced within the scope of the following claims.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Drying Of Solid Materials (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

L'invention concerne un dispositif et un procédé de préparation de poudres séchées par pulvérisation. Le dispositif comprend une chambre de séchage définissant une extrémité supérieure et une extrémité inférieure opposée ; une buse à haute pression située approximativement au niveau de l'extrémité supérieure de la chambre de séchage, la buse à haute pression étant conçue pour alimenter la chambre de séchage en un courant atomisé de liquide d'alimentation et de gaz de séchage primaire ; une sortie située approximativement au niveau de l'extrémité inférieure, la sortie étant conçue pour retirer les poudres séchées par pulvérisation ainsi formées dans la chambre de séchage ; une unité de classification en fonction des dimensions conçue pour recevoir les poudres séchées par pulvérisation et pour les classer en une première classe de poudres séchées par pulvérisation et au moins une classe supplémentaire de poudres séchées par pulvérisation ; et une buse à basse pression située approximativement au niveau de l'extrémité supérieure de la chambre de séchage, la buse à basse pression étant conçue pour recevoir ladite classe supplémentaire de poudres séchées par pulvérisation, un courant de vapeur et éventuellement un gaz de séchage secondaire et pour alimenter la chambre de séchage en ces derniers.
PCT/IB2019/052481 2018-09-10 2019-03-27 Dispositif et procédé de préparation de poudres séchées par pulvérisation WO2020053668A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201811034072 2018-09-10
IN201811034072 2018-09-10

Publications (1)

Publication Number Publication Date
WO2020053668A1 true WO2020053668A1 (fr) 2020-03-19

Family

ID=69777058

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2019/052481 WO2020053668A1 (fr) 2018-09-10 2019-03-27 Dispositif et procédé de préparation de poudres séchées par pulvérisation

Country Status (1)

Country Link
WO (1) WO2020053668A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6845571B1 (en) * 1999-06-16 2005-01-25 Merck Patent Gmbh Spray-drying installation and a method for using the same
EP1991329B1 (fr) * 2006-02-21 2012-11-21 Council of Scientific & Industrial Research Atomiseur a impact a roue à jet utilisé dans l'atomisation et procede pour preparer une pulverisation finement dispersee d'une boue / d'un liquide

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6845571B1 (en) * 1999-06-16 2005-01-25 Merck Patent Gmbh Spray-drying installation and a method for using the same
EP1991329B1 (fr) * 2006-02-21 2012-11-21 Council of Scientific & Industrial Research Atomiseur a impact a roue à jet utilisé dans l'atomisation et procede pour preparer une pulverisation finement dispersee d'une boue / d'un liquide

Similar Documents

Publication Publication Date Title
US6132478A (en) Coal-water slurry producing process, system therefor, and slurry transfer mechanism
US2560807A (en) Method of explosive pulverization
CN1935958B (zh) 用于从原料煤生产固体燃料的方法和设备
CN101243164B (zh) 以煤作原料的固体燃料的制造方法及制造装置
CN110475636A (zh) 雾化粉末的制造方法和磁芯的制造方法
WO2020065413A1 (fr) Appareil de séchoir à pulvérisation ayant un pulvérisateur pouvant être remplacé
CN109053615B (zh) 一种三聚氰胺的生产系统及方法
KR102100887B1 (ko) 초본계 바이오매스의 연속 가수분해 방법
WO2020053668A1 (fr) Dispositif et procédé de préparation de poudres séchées par pulvérisation
CA1135100A (fr) Methode de cuisson de la cellulose
EP0844020B1 (fr) Procédé et dispositif pour la pulvérisation de particules de substances solides dans une réaction hydrothermale en continu
CN105461780A (zh) 一种低成本茶皂素高效连续提取工艺
CN104130360A (zh) 一种多聚甲醛生产工艺方法
CN101148394A (zh) 一种采用加、减压技术分离甲基氯硅烷和氯甲烷的方法
CN100444943C (zh) 水力空化增强超临界辅助雾化制备微粒的系统及其方法
JP2006225555A (ja) ガスハイドレート製造装置およびガスハイドレート製造方法
KR101571250B1 (ko) 중탄산나트륨 제조 장치 및 그 제조 방법
US5383940A (en) Process of producing solid sodium cyanide
US20130092602A1 (en) Continuous Reaction System Comprising Subcritical Or Supercritical Liquid As Solvent And Reactant As Solid
CN109289230A (zh) 一种闭路循环-惰性粒子流化床连续化升华凝华分离精制装置及精制工艺
KR870001236B1 (ko) 우레아 제조방법
US4539010A (en) Coal preparation
CN110102226A (zh) 一种生物质热解液沸腾床反应器中颗粒移出工艺和装置
CN100584534C (zh) 一种硬质合金混合料的振动干燥方法及装置
CN215799242U (zh) 尿素合成未反应物再利用装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19861172

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19861172

Country of ref document: EP

Kind code of ref document: A1