GB1115649A - Selective oxidation of graphite from mixture thereof with diamond - Google Patents

Selective oxidation of graphite from mixture thereof with diamond

Info

Publication number
GB1115649A
GB1115649A GB893/68A GB89368A GB1115649A GB 1115649 A GB1115649 A GB 1115649A GB 893/68 A GB893/68 A GB 893/68A GB 89368 A GB89368 A GB 89368A GB 1115649 A GB1115649 A GB 1115649A
Authority
GB
United Kingdom
Prior art keywords
graphite
mixture
diamond
oxidation
oxygen
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
GB893/68A
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and 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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB1115649A publication Critical patent/GB1115649A/en
Expired legal-status Critical Current

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
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/06—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies
    • B01J3/08—Application of shock waves for chemical reactions or for modifying the crystal structure of substances
    • 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
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/06—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies
    • B01J3/062—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies characterised by the composition of the materials to be processed
    • 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
    • B01J2203/00—Processes utilising sub- or super atmospheric pressure
    • B01J2203/06—High pressure synthesis
    • B01J2203/0605—Composition of the material to be processed
    • B01J2203/061—Graphite
    • 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
    • B01J2203/00—Processes utilising sub- or super atmospheric pressure
    • B01J2203/06—High pressure synthesis
    • B01J2203/0605—Composition of the material to be processed
    • B01J2203/062—Diamond
    • 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
    • B01J2203/00—Processes utilising sub- or super atmospheric pressure
    • B01J2203/06—High pressure synthesis
    • B01J2203/0605—Composition of the material to be processed
    • B01J2203/0625—Carbon
    • 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
    • B01J2203/00—Processes utilising sub- or super atmospheric pressure
    • B01J2203/06—High pressure synthesis
    • B01J2203/065—Composition of the material produced
    • B01J2203/0655—Diamond
    • 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
    • B01J2203/00—Processes utilising sub- or super atmospheric pressure
    • B01J2203/06—High pressure synthesis
    • B01J2203/0675—Structural or physico-chemical features of the materials processed
    • B01J2203/068—Crystal growth
    • 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
    • B01J2203/00—Processes utilising sub- or super atmospheric pressure
    • B01J2203/06—High pressure synthesis
    • B01J2203/0675—Structural or physico-chemical features of the materials processed
    • B01J2203/0685—Crystal sintering

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

A process for selectively oxidizing graphite in a mixture thereof with diamond comprises heating the mixture with a lead oxide or lead oxide precursor at a temperature sufficiently high to achieve oxidation of the graphite and sufficiently low to avoid substantial oxidation of the diamond, said temperature being within the range of 350 DEG to 550 DEG C., preferably 380 DEG to 430 DEG C. in the presence of air or oxygen. The oxidation catalyst may be PbO, PbO2, Pb2O3 or Pb3O4, or mixture thereof or an oxygen-containing lead compound which is transformed to a lead oxide in situ, e.g. lead carbonate, hydroxide, nitrate or subacetate. The graphite particle size is preferably less than 1 mm., especially less than 200 microns and the lead compound particle size is preferably less than 1 mm., especially less than 50 microns, and the catalyst and graphite should preferably be intimately mixed. Preferably 5% of lead oxide catalyst, based on the weight of the graphite-diamond mixture, and more preferably 10% to 100%, may be used and oxidation may be carried out merely in an atmosphere of air or oxygen, or air or oxygen may flow through and/or over the mixture which may be shaken or swirled. After oxidation of the graphite the diamond may be recovered by selectively dissolving out the lead oxide with an aqueous acid such as nitric, acetic, hydrochloric, citric or ethylenediaminetetraacetic acid.
GB893/68A 1964-06-05 1965-05-19 Selective oxidation of graphite from mixture thereof with diamond Expired GB1115649A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US37310964A 1964-06-05 1964-06-05
US38875364A 1964-08-11 1964-08-11

Publications (1)

Publication Number Publication Date
GB1115649A true GB1115649A (en) 1968-05-29

Family

ID=27006044

Family Applications (1)

Application Number Title Priority Date Filing Date
GB893/68A Expired GB1115649A (en) 1964-06-05 1965-05-19 Selective oxidation of graphite from mixture thereof with diamond

Country Status (1)

Country Link
GB (1) GB1115649A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2159509A (en) * 1984-05-11 1985-12-04 Nippon Oils & Fats Co Ltd Method for purifying diamond
WO2013044027A1 (en) * 2011-09-21 2013-03-28 Diamond Innovations, Inc. Polycrystalline diamond compacts having improved wear characteristics and methods of making the same
CN112551521A (en) * 2020-11-09 2021-03-26 河南黄河旋风股份有限公司 Environment-friendly diamond purification method based on high-temperature air

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2159509A (en) * 1984-05-11 1985-12-04 Nippon Oils & Fats Co Ltd Method for purifying diamond
WO2013044027A1 (en) * 2011-09-21 2013-03-28 Diamond Innovations, Inc. Polycrystalline diamond compacts having improved wear characteristics and methods of making the same
CN103826735A (en) * 2011-09-21 2014-05-28 戴蒙得创新股份有限公司 Polycrystalline diamond compacts having improved wear characteristics and methods of making the same
US9381483B2 (en) 2011-09-21 2016-07-05 Diamond Innovations, Inc. Polycrystalline diamond compacts having improved wear characteristics, and method of making the same
CN103826735B (en) * 2011-09-21 2017-08-08 戴蒙得创新股份有限公司 Polycrystalline diamond compact and its manufacture method with improved wearing character
CN112551521A (en) * 2020-11-09 2021-03-26 河南黄河旋风股份有限公司 Environment-friendly diamond purification method based on high-temperature air
CN112551521B (en) * 2020-11-09 2022-08-16 河南黄河旋风股份有限公司 Environment-friendly diamond purification method based on high-temperature air

Similar Documents

Publication Publication Date Title
JPS5212126A (en) Process for preparation of methacrylic acid
GB961357A (en) Catalytic compositions
JPS5223589A (en) Catalyst for producing alpha,beta-unsaturaded carboxylic acid
GB1115649A (en) Selective oxidation of graphite from mixture thereof with diamond
GB864846A (en) Improvements in or relating to ceramic members
GB952622A (en) Manufacture of platinum-alumina catalyst
GB1081756A (en) Large crystalline tungsten and a process for its production
JPS5239643A (en) A process for preparing terephtalic acid
JPS5331615A (en) Production of methacrylic acid and catalyst used thereof
GB1399398A (en) Process for the manufacture of saturated aliphatic monocarbo xylic acids
ES392133A1 (en) Manufacture of concentrated nitric acid
FR2261810A1 (en) Mixed oxide catalyst for nitrogen oxides sepn from flue gas - by calcining a dispersion of rare-earth oxides in aluminium oxides
JPS54132519A (en) Method of oxidation of glycol
GB817918A (en) Improvements in or relating to methods of manufacturing radiation-sensitive sinteredbodies containing cadmium sulphide
GB1120401A (en) Process for the production of hydrocyanic acid
GB919052A (en) Improvements in or relating to the manufacture of sintered metallic bodies
JPS535110A (en) Preparation of adipic acid
JPS5256077A (en) Process of oxidation at low temperature
GB1023260A (en) Improvements in or relating to methods of producing semiconductive materials and semiconductor elements made from such material
JPS568332A (en) Preparation of oxygen-containing compound
JPS539755A (en) Preparation of pregnane type steroid-17 alpha-esters
GB1086164A (en) Process for the preparation of 2,3-dichloro-5,6-dicyanobenzoquinone
JPS5398923A (en) Preparation of hydroxyacetic acid
JPS52139684A (en) Air purification catalyst, production thereof, and air purification apparatus
JPS523044A (en) Method of prepring naphthoquinone