GB571527A - Improvements in or relating to the production of crystalline nitroguanidine in an extremely fine state of subdivision - Google Patents

Improvements in or relating to the production of crystalline nitroguanidine in an extremely fine state of subdivision

Info

Publication number
GB571527A
GB571527A GB7487/42A GB748742A GB571527A GB 571527 A GB571527 A GB 571527A GB 7487/42 A GB7487/42 A GB 7487/42A GB 748742 A GB748742 A GB 748742A GB 571527 A GB571527 A GB 571527A
Authority
GB
United Kingdom
Prior art keywords
crystals
nitroguanidine
solution
tank
pipe
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.)
Expired
Application number
GB7487/42A
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.)
Wyeth Holdings LLC
Original Assignee
American Cyanamid Co
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 American Cyanamid Co filed Critical American Cyanamid Co
Publication of GB571527A publication Critical patent/GB571527A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0004—Crystallisation cooling by heat exchange
    • B01D9/0009—Crystallisation cooling by heat exchange by direct heat exchange with added cooling fluid
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

571,527. Crystallizing nitroguanidine. AMERICAN CYANAMID CO. June 2, 1942, No. 7487. Convention date, June 27, 1941. [Class 32] Finely divided crystals of guanidine are obtained by finely dividing a guanidine solution, e.g., by spraying, to form a mist of droplets and supersaturating the solution by cooling or concentration to form fine crystals suspended in the droplets and recovering the crystals therefrom. Nitroguanidine from a make-up tank 1 is fed through a filter 16 and feed tank 5 to a pipe 13 where it is mixed with steam 14 and sprayed through nozzles 15 against a counter-current of air admitted at 11 and drawn off through a pipe 12. A slurry is collected in a trough 19 and after separation of the crystals in a filter 21 is recirculated to the tank 1. Part of the slurry is fed through flushing pipe 18 to wash down the walls of the spraying vessel 10. Modified spray chambers are described which may be of conical formation with provision for admitting air at various heights in the chamber. The Specification as open to inspection under Sect. 91 refers to the crystallization of any solution. This subject-matter does not appear in the Specification as accepted.
GB7487/42A 1941-06-27 1942-06-02 Improvements in or relating to the production of crystalline nitroguanidine in an extremely fine state of subdivision Expired GB571527A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US571527XA 1941-06-27 1941-06-27
US260847XA 1942-12-10 1942-12-10

Publications (1)

Publication Number Publication Date
GB571527A true GB571527A (en) 1945-08-29

Family

ID=26700758

Family Applications (2)

Application Number Title Priority Date Filing Date
GB7487/42A Expired GB571527A (en) 1941-06-27 1942-06-02 Improvements in or relating to the production of crystalline nitroguanidine in an extremely fine state of subdivision
GB18898/43A Expired GB576505A (en) 1941-06-27 1943-11-12 Spray crystallizing apparatus and process

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB18898/43A Expired GB576505A (en) 1941-06-27 1943-11-12 Spray crystallizing apparatus and process

Country Status (2)

Country Link
CH (1) CH260847A (en)
GB (2) GB571527A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1004090B (en) * 1955-10-22 1957-03-07 Chemisches Werk Lowi G M B H Process for the production of nitroguanidine with a high specific surface
CN114288703A (en) * 2022-01-25 2022-04-08 车强 Crystallization and separation equipment for boric acid production

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4702799A (en) * 1985-09-03 1987-10-27 Nestec S.A. Dryer and drying method
DE3807543A1 (en) * 1988-03-08 1989-09-21 Roehm Gmbh METHOD FOR PRODUCING SPRAY-DRYED EMULSION POLYMERISATES
CN110204461B (en) * 2019-05-15 2022-04-05 西安万德能源化学股份有限公司 Nitroguanidine crystal and microchannel crystallization process and device of nitroguanidine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1004090B (en) * 1955-10-22 1957-03-07 Chemisches Werk Lowi G M B H Process for the production of nitroguanidine with a high specific surface
CN114288703A (en) * 2022-01-25 2022-04-08 车强 Crystallization and separation equipment for boric acid production
CN114288703B (en) * 2022-01-25 2023-08-25 南京吉才汇科技有限公司 Crystallization separation equipment for boric acid production

Also Published As

Publication number Publication date
GB576505A (en) 1946-04-08
CH260847A (en) 1949-04-15

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