GB711254A - Process for the manufacture of boron nitride - Google Patents

Process for the manufacture of boron nitride

Info

Publication number
GB711254A
GB711254A GB21268/52A GB2126852A GB711254A GB 711254 A GB711254 A GB 711254A GB 21268/52 A GB21268/52 A GB 21268/52A GB 2126852 A GB2126852 A GB 2126852A GB 711254 A GB711254 A GB 711254A
Authority
GB
United Kingdom
Prior art keywords
tube
boron
temperature
boron nitride
graphite
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
GB21268/52A
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.)
Norton Grinding Wheel Co Ltd
Original Assignee
Norton Grinding Wheel Co Ltd
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 Norton Grinding Wheel Co Ltd filed Critical Norton Grinding Wheel Co Ltd
Publication of GB711254A publication Critical patent/GB711254A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00—Nitrogen; Compounds thereof
    • C01B21/06—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron
    • C01B21/064—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with boron
    • C01B21/0643—Preparation from boron halides

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Ceramic Products (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

Boron nitride is produced by passing chlorine gas through boron carbide heated to above 300 DEG C out of contact with air or oxygen, immediately mixing the boron trichloride produced with ammonia and immediately heating the mixture to 500 DEG C and ultimately raising the temperature of the mixture to at least 1600 DEG C out of contact with air or oxygen, and filtering the reaction product to remove boron nitride. Dry chlorine is fed at 12 into graphite tube 15 surrounded by casing 15a containing heat-insulating material. Tube 15 is packed with lumps or grains of boron carbide and heated by a resistance heater to about 400 DEG C. The boron trichloride formed is passed directly to 20 and passes through tube 21 into graphite tube 23, which is heated by current supplied through water cooled electrode clamps <PICT:0711254/III/1> and bus bars 24, 25, and is surrounded by casings 23a, 23b containing heat-insulating material. The tube 21 ends at a point where the temperature in tube 23 is at least 500 DEG C. Excess ammonia enters at 26 and after mixing with the boron trichloride passes through graphite baffles 30, which create turbulence where the temperature is at least 1800 DEG C. Graphite tube 27 is provided for measuring the temperature by optical pyrometer. The reaction products pass out through air or water cooled pipe 32 to woven glass fabric filter 41 for removal of boron nitride. Hydrogen chloride may be recovered from the waste gases, mainly nitrogen and hydrogen, by scrubbing. The filter may be at 335 DEG C. or above, e.g. above 500 DEG C., but is preferably kept at below 100 DEG C.
GB21268/52A 1951-08-25 1952-08-25 Process for the manufacture of boron nitride Expired GB711254A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US711254XA 1951-08-25 1951-08-25

Publications (1)

Publication Number Publication Date
GB711254A true GB711254A (en) 1954-06-30

Family

ID=22099388

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21268/52A Expired GB711254A (en) 1951-08-25 1952-08-25 Process for the manufacture of boron nitride

Country Status (3)

Country Link
DE (1) DE956578C (en)
FR (1) FR1065685A (en)
GB (1) GB711254A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2834650A (en) * 1955-10-04 1958-05-13 Union Carbide Corp Production of boron nitride
GB2304104A (en) * 1995-08-12 1997-03-12 Epichem Ltd Process for producing boron trichloride
EP2878578A1 (en) * 2012-07-27 2015-06-03 Hanwha Chemical Corporation Porous boron nitride and method for manufacturing same

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE342047C (en) * 1919-03-22 1921-10-12 Friedrich Meyer Dr Process and device for the production of pure boron nitride
US2369214A (en) * 1944-03-28 1945-02-13 Frank H Wilson Method of purifying boron trichloride

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2834650A (en) * 1955-10-04 1958-05-13 Union Carbide Corp Production of boron nitride
GB2304104A (en) * 1995-08-12 1997-03-12 Epichem Ltd Process for producing boron trichloride
EP2878578A1 (en) * 2012-07-27 2015-06-03 Hanwha Chemical Corporation Porous boron nitride and method for manufacturing same
EP2878578A4 (en) * 2012-07-27 2016-09-28 Hanwha Chemical Corp Porous boron nitride and method for manufacturing same

Also Published As

Publication number Publication date
DE956578C (en) 1957-01-24
FR1065685A (en) 1954-05-28

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