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    • 4. 发明专利
    • GAS GENERATOR
    • JPH0776255A
    • 1995-03-20
    • JP16966994
    • 1994-07-21
    • DYNAMIT NOBEL AG
    • YOOZEFU KURAFUTOGERITSUTO SHIYAIDERAA
    • B01J7/00B60R21/26B60R21/264
    • PURPOSE: To improve damming and sealing of a gas generator by providing a rolled-up overlapping damming strip which is brought into contact with a wall at least partially in order to dam outflow openings of an ignition unit of a gas-generating agent in the inside of an inner tube. CONSTITUTION: A tubular gas generator 6 for an impact protection air bag of a motor vehicle has an outer tube 12 made of special steel, and gas exit openings 14 are formed on a peripheral wall of the outer tube. A special steel inner tube 16 arranged coaxially in relation to the outer tube 12 is stored in an inner tube of the outer tube 12. Both ends of the outer tube 12 are closed by disk-like closing covers 28, and disk members 27 are supported, on the one hand, by pellets and, on the other hand, by closing covers 28. A rolled-up overlapping damming strip 2 is provided between a gas-generating agent as the pellets and the inner tube 16. The damming strip is a steel strip that can be avoided a welding process or a bonding process for damming, and which can be obtained opening gas pressure that is constant at all temperature.
    • 9. 发明专利
    • JPH0525867B2
    • 1993-04-14
    • JP2711081
    • 1981-02-27
    • DYNAMIT NOBEL AG
    • OIGEN HADAMOFUSUKIIANTON SHEENGENHAINTSU SHUREEDAA
    • C07C63/26C07C27/02C07C51/00C07C51/09C07C67/00
    • Terephthalic acid, (I), is prepd. from dimethyl terephthalate, (II), as intermediate prod., by (a) p-xylene and/or p-Me toluate (III) oxidn. with O2-contg. gases in the presence of heavy metal-contg. oxidn. catalysts at increased temp. and pressure; (b) oxidn. mixt. esterification with MeOH at increased temp. and pressure; (c) crude ester sepn. by distn. into a (III)-rich fraction, which is returned to oxidn., a residue fraction and crude (II). (d) The crude-(II) is hydrolysed continuously with water, at crude-(II): water wt. ratio 3:1 to 0.1:1, at 350 to 180 deg.C and under a pressure sufficient to maintain the liq. phase. (e) (I) is crystallised out at 300 to 100 deg.C. (f) The mother liquor is replaced by desalted water and (I) is recovered from the reaction mixt. Novelty comprises (i) introducing hot steam, at 300 to 180 deg.C, at the bottom of a multi-step hydrolysis reactor, and hot crude-(II), at 350 to 140 deg.C, to the head of the reactor. (ii) At conversion 90% or over, a reaction mixt. is drawn off at bottom as liq. phase or as solid phases suspended in the liq. phase, while an MeOH-water mixt. is drawn off at head, at 300 to 150 deg.C. (iii) The mixt. is condensed. (iv) A condensate pt. is recycled to hydrolysis reactor head, and the other pt. is returned to the process. (I) obtd. can be directly esterified with ethylene glycol and converted to fibre- and film-forming polyesters. Recycling of mono-methyl terephthalate-contg. mother liquor is unnecessary.