UST980005I4 - Granulation and coating by improved method of heat removal - Google Patents

Granulation and coating by improved method of heat removal Download PDF

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Publication number
UST980005I4
UST980005I4 US05/850,588 US85058877A UST980005I4 US T980005 I4 UST980005 I4 US T980005I4 US 85058877 A US85058877 A US 85058877A US T980005 I4 UST980005 I4 US T980005I4
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US
United States
Prior art keywords
granules
vessel
evaporation
recycle
mist
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
US05/850,588
Inventor
Arthur R. Shirley, Jr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tennessee Valley Authority (ATV)
Original Assignee
Tennessee Valley Authority (ATV)
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 Tennessee Valley Authority (ATV) filed Critical Tennessee Valley Authority (ATV)
Priority to US05/850,588 priority Critical patent/UST980005I4/en
Application granted granted Critical
Publication of UST980005I4 publication Critical patent/UST980005I4/en
Pending legal-status Critical Current

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    • 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
    • B01J2/12—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in rotating drums
    • 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
    • B01J2/006—Coating of the granules without description of the process or the device by which the granules are obtained
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/02—Preparation of sulfur; Purification
    • C01B17/0237—Converting into particles, e.g. by granulation, milling
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/02—Preparation of sulfur; Purification
    • C01B17/0243—Other after-treatment of sulfur
    • C01B17/0248—Other after-treatment of sulfur of particulate sulfur
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C9/00—Fertilisers containing urea or urea compounds
    • C05C9/005—Post-treatment

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Glanulating (AREA)

Abstract

an improved process for the granulation or coating of hygroscopic or nonhygroscopic materials where melt is sprayed onto cascading granules of common or uncommon substrate in an enclosed vessel such as a rotary drum preferably with lifting flights which provide maximum mixing of the granules and the atmosphere enclosed in the unit and where heat given off by solidification of the melt is absorbed by evaporation of water which is atomized as an extremely fine mist into areas of the vessel which are not subtended by falling granules. Evaporation is effected without impingement of the mist on the granules or vessel internals. Air for evaporation is pulled through the vessel concurrent with the flow of granules and its moisture content is regulated below the critical humidity of the granules throughout the vessel. Some recycle of undersize granules discharged from the vessel is maintained for size control; however, examples show the recycle rate decreased by 87 percent over recycle cooled processes as 73 percent of the heat evolved is removed by evaporation of water mist. An equation is developed which mathematically represents the thermodynamics of the process and specific values are presented for variables when granulating sulfur or urea.
US05/850,588 1977-11-11 1977-11-11 Granulation and coating by improved method of heat removal Pending UST980005I4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US05/850,588 UST980005I4 (en) 1977-11-11 1977-11-11 Granulation and coating by improved method of heat removal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/850,588 UST980005I4 (en) 1977-11-11 1977-11-11 Granulation and coating by improved method of heat removal

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/916,988 Continuation-In-Part US4213924A (en) 1978-06-19 1978-06-19 Granulation and coating by improved method of heat removal

Publications (1)

Publication Number Publication Date
UST980005I4 true UST980005I4 (en) 1979-03-06

Family

ID=25308571

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/850,588 Pending UST980005I4 (en) 1977-11-11 1977-11-11 Granulation and coating by improved method of heat removal

Country Status (1)

Country Link
US (1) UST980005I4 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4213924A (en) 1978-06-19 1980-07-22 Tennessee Valley Authority Granulation and coating by improved method of heat removal
US4478171A (en) 1983-09-02 1984-10-23 Olin Corporation Variably displaceable spray nozzles
US4478170A (en) 1983-07-05 1984-10-23 Olin Corporation Spray grainer
US4570567A (en) 1983-09-30 1986-02-18 Olin Corporation Air classification in a spray grainer
US5505885A (en) * 1993-06-29 1996-04-09 Bacardi; Jean M. Granulation of phosphorus pentasulfide with a predetermined reactivity
US5788896A (en) * 1997-02-27 1998-08-04 Alberta Research Council Method of producing micron sized sulphur granules
US20060121280A1 (en) * 2004-11-01 2006-06-08 Novozymes A/S Continuous encapsulation process
US20070116769A1 (en) * 2004-11-01 2007-05-24 Novozymes A/S Continuous encapsulation process

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4213924A (en) 1978-06-19 1980-07-22 Tennessee Valley Authority Granulation and coating by improved method of heat removal
US4478170A (en) 1983-07-05 1984-10-23 Olin Corporation Spray grainer
US4478171A (en) 1983-09-02 1984-10-23 Olin Corporation Variably displaceable spray nozzles
US4570567A (en) 1983-09-30 1986-02-18 Olin Corporation Air classification in a spray grainer
US5505885A (en) * 1993-06-29 1996-04-09 Bacardi; Jean M. Granulation of phosphorus pentasulfide with a predetermined reactivity
US5788896A (en) * 1997-02-27 1998-08-04 Alberta Research Council Method of producing micron sized sulphur granules
US20060121280A1 (en) * 2004-11-01 2006-06-08 Novozymes A/S Continuous encapsulation process
US20070116769A1 (en) * 2004-11-01 2007-05-24 Novozymes A/S Continuous encapsulation process

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