GB924784A - Improvements in or relating to method and apparatus for production of high vacua - Google Patents

Improvements in or relating to method and apparatus for production of high vacua

Info

Publication number
GB924784A
GB924784A GB8747/61A GB874761A GB924784A GB 924784 A GB924784 A GB 924784A GB 8747/61 A GB8747/61 A GB 8747/61A GB 874761 A GB874761 A GB 874761A GB 924784 A GB924784 A GB 924784A
Authority
GB
United Kingdom
Prior art keywords
ethers
mixtures
boiling point
isomers
halogen
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
GB8747/61A
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.)
KENNETH CLAUDE DEVEREUX HICKMA
Original Assignee
KENNETH CLAUDE DEVEREUX HICKMA
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 KENNETH CLAUDE DEVEREUX HICKMA filed Critical KENNETH CLAUDE DEVEREUX HICKMA
Publication of GB924784A publication Critical patent/GB924784A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/08—Materials not undergoing a change of physical state when used
    • C09K5/10—Liquid materials

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Polyethers (AREA)

Abstract

The working fluid of a diffusion type vacuum pump comprises a polyphenyl ether having from three to seven phenyl groups linked by two to six oxygen atoms arranged in a chain. Separate isomers of the compounds may be used or mixtures of the ortho-, meta-, and para-isomers, and mixtures of polyphenyl ethers of different molecular weights may also be used. The ethers may be prepared by interlinking halogen derivatives and then eliminating the halogen, the last traces of which may be removed by treatment with sodium ethoxide in ethanol. Low boiling point impurities and oxidisable material are removed by prolonged moderate heating under vacuum or bubbling an inert gas or dry air at temperatures below 200 DEG C. through the ethers. For greater purification, the above steps are followed by slow distillation under high vacuum, rejecting the first 1% to 5% and last 1-5%. The boiling point range of the preferred ethers is 160 DEG C. to 300 DEG C. at 0.1 mm. pressure.
GB8747/61A 1960-03-11 1961-03-09 Improvements in or relating to method and apparatus for production of high vacua Expired GB924784A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14222A US3034700A (en) 1960-03-11 1960-03-11 Method of producing high vacuum

Publications (1)

Publication Number Publication Date
GB924784A true GB924784A (en) 1963-05-01

Family

ID=21764194

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8747/61A Expired GB924784A (en) 1960-03-11 1961-03-09 Improvements in or relating to method and apparatus for production of high vacua

Country Status (3)

Country Link
US (1) US3034700A (en)
DE (1) DE1250049B (en)
GB (1) GB924784A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3221058A (en) * 1965-11-30 Aromatic polyethers
US3228910A (en) * 1960-09-22 1966-01-11 Du Pont Process for preparing solid poly-1, 4-phenylene ethers
US3173873A (en) * 1962-01-23 1965-03-16 Monsanto Res Corp Functional fluid compositions
US3355094A (en) * 1963-07-02 1967-11-28 Ceskoslovenska Akademie Ved Diffusion vacuum pump
US3391195A (en) * 1963-12-04 1968-07-02 Monsanto Res Corp Fluorinated polyphenyl ethers
US3923424A (en) * 1974-11-11 1975-12-02 Alvin E Buggele Self-cleansing diffusion pump
US5059002A (en) * 1989-12-21 1991-10-22 Minnesota Mining And Manufacturing Company Second harmonic generation with achiral, straight-chain carbamic acid derivatives

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2951629A (en) * 1958-07-21 1960-09-06 Dow Corning Silicate diffusion pump fluids

Also Published As

Publication number Publication date
US3034700A (en) 1962-05-15
DE1250049B (en) 1967-09-14

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