4.
    发明专利
    未知

    公开(公告)号:DE19606877A1

    公开(公告)日:1997-08-28

    申请号:DE19606877

    申请日:1996-02-23

    Applicant: BASF AG

    Abstract: A process for purifying (meth)acrylic acid by phase separation techniques comprises the following steps: (a) a mixture containing (meth)acrylic acid is separated into distinct phases in the presence of an organic solvent, with the composition of the (meth)acrylic acid-rich phase remaining essentially unchanged, and this acid-rich phase is separated; (b) the remaining phase from step (a) is separated into indistinct phases; and (c) one of the phases from step (b) is returned to step (a). Also claimed is preparation of (meth)acrylic acid. Preferably in step (c) the acid-rich phase is returned to step (a). 1-100 (100) wt.% of the phase remaining from step (a) is used in step (b). Pure end product is added to steps (a) and (b). Step (a) involves crystallisation, freezing or sublimation, preferably static and/or dynamic crystallisation, and most preferably a combined static and dynamic crystallisation in which the residue from the dynamic crystallisation is added to the static crystallisation step and the crystallised product from the static crystallisation is returned to the dynamic crystallisation.

    PREPARATION OF PROPENE FROM PROPANE

    公开(公告)号:MY144056A

    公开(公告)日:2011-08-15

    申请号:MYPI20055753

    申请日:2005-12-08

    Applicant: BASF AG

    Abstract: - 23 - PREPARATION OF PROPME FROM.-PROPANE ABSTIACT THE INVENTION RELATES TO A PROCESS FOR PIEPARIN,O PIOPENE FROM PROPANE, COMPRISING THE 5 STEPS: A) A FEED GAS SIREARN A COMPSING PROPANE IS PROVIDED; B) THE FEED PAS STREAM A COMPRISING PROPANE AND AN OXYGENOUS -AS STREARN ARE FED 10 INTO A DEHYDRO.-ENATION ZONE AND PROPANE IS SUBJECTED TO A NONOXIDATIVE CAIALYLIC, AUTOTHEIRRIAL DCHYDROGENATION TO PROPENE TO OBTAIN A PI ODUCI GAS STREAM B CORNPRIS- ING PROPANE, PIOPENE, METHANE. ETHANE. ETHENE, C4' HYDROCWBOJIS, CARBON NIONOX- IDE, CAIBON DIOXIDE, STEAM AND LWDRO2CN, 15 Q THE PRODUCT OAS STREAM B IS COOLED AND SICAM IS IERNOVED BY CONDENS3TION LO OB- IAIN A SICARRI-DEPLETED PRODUCT GAS STICARN C, D) CARBON DIOXIDE IS IENIOVED BY OAS SCRUBBJN2 TO OBTAIN A CARBON DIOXIDE-DEPLETED PRODUCT GAS STREAM D, 20 E) THC PRODUCT -AS STICARN D IS COOLED AND A LIQUID HYDIOCAIBON STREAM EL CORNPLISINO PROPANE, PROPENE, METHANE, ETHANE. ETHERIC AND C@' LI@,DROCARBONS IS IEMOVED BN CONDENSATION IO LEAVE A RESIDUAL GAS STREAM E2 CORNPIISIN.- METHANE, HYDJO,GEN AND CARBON MONOXIDE. 25 F) THE LIQUID HYDROCARBON STREAM EL IS FED INTO A FIRST DISTILLATION ZONE AND SEPARATED DISTILLAIIVELY INTO A STREAM 1-1 COMPIISING PROPANE. PROPENE AND THE C4' HYDIOCAR- BONS AND A STREAM 1`2 COMPRISING ETHANE AND CIHENE. 30 G) THE STICARN FJ IS FED INTO A SECOND DISIFLLANON ZONE AND SEPARATED DISTILLANVELY INTO A PIODUCT STREAM 21 CORNPIISIN2 PROPENE AND A STREAM G2 COMPIISING PROPANE AND THE C4' HYDI OCAI BONS.

    9.
    发明专利
    未知

    公开(公告)号:DE19627847A1

    公开(公告)日:1998-01-15

    申请号:DE19627847

    申请日:1996-07-10

    Applicant: BASF AG

    Abstract: Disclosed is a method of preparing acrylic acid or methacrylic acid by: (a) preparing a gaseous product mixture having essentially the composition of a reaction mixture of catalytic gas-phase oxidation of C3/C4 alkanes, alkenes, alkanols and/or alkanals and/or precursors thereof to form acrylic acid or methacrylic acid, characterized by (b) condensation of the product mixture, (c) crystallization of the acrylic acid or methacrylic acid from the solution obtained in stage (b), and (d) extraction of the resulting crystals from the mother liquor.

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