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 vacuaInfo
- 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
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.
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2951629A (en) * | 1958-07-21 | 1960-09-06 | Dow Corning | Silicate diffusion pump fluids |
-
0
- DE DENDAT1250049D patent/DE1250049B/de active Pending
-
1960
- 1960-03-11 US US14222A patent/US3034700A/en not_active Expired - Lifetime
-
1961
- 1961-03-09 GB GB8747/61A patent/GB924784A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1250049B (en) | 1967-09-14 |
US3034700A (en) | 1962-05-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5267810A (en) | High vacuum pump | |
GB924784A (en) | Improvements in or relating to method and apparatus for production of high vacua | |
JPS521554A (en) | Heat exchanger for turbo fluid machine | |
GB884184A (en) | Improvements in or relating to the production of new compounds from wood | |
ES403793A1 (en) | Procedure for the obtaining of terpenic mixtures. (Machine-translation by Google Translate, not legally binding) | |
FR1501187A (en) | Process for preparing microporous flat articles, permeable to water vapor, based on polyether urethanes | |
JPS5219347A (en) | Method to cool down transport pipe line of low temperature liquefied g as | |
GB824639A (en) | Process of purifying maleic anhydride | |
JPS51141970A (en) | Air cylinder | |
FR953476A (en) | Process for the extraction of various products, by treatment of wood and plant substances and resulting products | |
ES288798A1 (en) | Procedure for the production of olefins (Machine-translation by Google Translate, not legally binding) | |
JPS5250686A (en) | Production of semiconductor device | |
JPS51114707A (en) | Air exhausting apparatus for a rotating body | |
BE611652A (en) | Process for the preparation of new prègnadienes, inter alia from Delta <1,4> -3,20dioxo-6alpha-fluoro-16alpha-methyl-11beta, 14alpha17alpha, 21-tetrahydroxy-pregnadiene | |
JPS5323867A (en) | Production of distilled water | |
GB1031833A (en) | Process for treating tungsten | |
ES211268A1 (en) | Procedure and installation for superdepuration of alcohol in the vacuum (Machine-translation by Google Translate, not legally binding) | |
FR974218A (en) | Process for the industrial liquefaction of gases, in particular absolute hydrochloric acid | |
JPS51131392A (en) | Fluid choromatography | |
JPS51130742A (en) | Cooling method of hydraulic machine | |
ES283615A1 (en) | A procedure to purify methanol (Machine-translation by Google Translate, not legally binding) | |
FR1274403A (en) | Process for the preparation of new dioxygenated androstanes in 11, 18 | |
JPS5220913A (en) | Vacuum heat treatment apparatus | |
BE587714A (en) | Process for the preparation of new cyclic ethers, in particular 18-O-ethers of 17-desmethoxy-17-alkoxy (lower) -deserpidic acids. | |
JPS5222372A (en) | Tubular body cleaning equipment of quartz tube for diffustion |