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    11.
    发明专利
    未知

    公开(公告)号：DE1902461A1

    公开(公告)日：1970-07-23

    申请号：DE1902461

    申请日：1969-01-18

    Applicant: BASF AG

    Inventor： WEITZ DR HANS-MARTIN ,  FUERST DR ERNST

    IPC: B01D11/04 ,  C07C7/10 ,  C10G21/20

    Abstract: 1286891 Extraction to separate aromatic hydrocarbons BADISCHE ANILIN- & SODAFABRIK AG 16 Jan 1970 [18 Jan 1969] 2220/70 Heading C5E Aromatic compounds are recovered from hydrocarbon feeds by extraction with a solvent containing (a) an N-alkylpyrrolidone together with (b) one or more compounds of the Formula I where Y is an alkylene or alkenylene group containing 2 or 3 carbon atoms or an o-phenylene group which can be partially hydrogenated, Z is an oxygen atom or two hydrogen atoms, and where R is an alkylene group of 2 to 12 carbon atoms. The solvent can contain 1-10 wt. per cent water and component (a) can be N-methylpyrrolidone and component (b) is suitably the N-hydroxyethyl derivative of pyrrolidone, maleimide, succinimide, glutarimide, phthalimide or of the imide of tetrahydrophthalic acid. Benzene, toluene, xylene, ethylbenzene, styrene and naphthalene can be separated from feeds such as straight-run gasolines, cracked gasolines, pyrolysis gasolines, low-temperature coking gasolines, reformed gasolines, diesel oils, gas oils and lubricating oils by batchwise or countercurrent liquid-liquid solvent extraction, countercurrent washing of vapours or extractive distillation. Fig. 1 illustrates a solvent extraction in which the feed enters the bottom of the column 1 and the extraction solvent is fed to the top of the column to produce a raffinate P and an extract phase which is removed from the bottom of the column. The extract is distilled at 3 to produce a stream of light hydrocarbons which is condensed at 4 and recycled to the bottom of the column 1, the extracting solvent which is removed from the bottom of the column 3 and recycled to the extraction, and an aromatic vapour stream which is washed at 5 with some of the condensed aromatic product. Fig. 2 (not shown) illustrates the separation of aromatics by countercurrent washing; the feed is vapourized at 7 and washed by a countercurrent of the liquid extraction solvent which is passed into the top of the column 6. The non-aromatic vapour P is condensed and part of the condensate is used to wash the non-aromatic vapour and recycled to the column 6. The extract containing the aromatics is distilled at 8 to provide a light hydrocarbon stream which is recycled to the washing column 6, recovered solvent which is recycled and an aromatic stream which is washed. In an example pure benzene is separated from a mixture of 50 parts by volume nheptane, 40 parts benzene and 10 parts cyclohexene by batchwise solvent extraction with a mixture of equal volumes of N-methylpyrrolidone and N-hydroxyethyl succinimide.

    17.
    发明专利
    未知

    公开(公告)号：DE1272913B

    公开(公告)日：1968-07-18

    申请号：DEB0072428

    申请日：1963-06-26

    Applicant: BASF AG

    Inventor： WEGERICH DR ANTON ,  FUERST DR ERNST ,  HAARER DR ERICH ,  CORR DR HUBERT

    IPC: C07C51/44

    Abstract: A mixture of succinic, glutaric and adipic acids, such as obtained by the oxidation of cyclohexanol, cyclohexanone or cyclohexane is separated by fractional distillation under subatmospheric pressure in the presence of steam. The mixture is introduced from tank 1 into evaporator 2, which is heated to about 200 DEG C. and is maintained at an absolute pressure of 40 to 100 mm. Hg. The mixture then flows down column 4 into a still 5 at 195 DEG to 220 DEG C. into which superheated steam is injected through line 7. The steam laden with acid vapours is conducted from the head of the column into the evaporator, the vapours then passing through line 8 into a condenser 9 and being sprayed therein with an aqueous solution from a receiver 10. Crystals of succinic acid suspended in an aqueous solution are obtained by cooling in a vessel 14, are separated out in a centrifuge 15. The mother liquid is evaporated and the residue is returned to the crude product. The product received in vessel 6 from the still is substantially glutaric and adipic acids. Water is added to convert anhydrides into acids before preheating in 17 and passing the mixture into a column 18. The still 19 of the column is heated to 200 DEG C., a vacuum of 40-50 mm. Hg is maintained at the top of the column, and superheated steam is passed through line 20 into the still. The vapours leaving the head of the column are cooled in a condenser 21 and liquid glutaric acid so formed flows into a receiver 22 while steam with a small amount of succinic acid flows into a condenser 23. A mixture of adipic acid with a small amount of glutaric acid is withdrawn at 27 from the still from which adipic acid may be recovered by crystallization. The columns are provided with packings, baffles, spirals or bubble trays.

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