PREPARATION OF MALEIC ANHYDRIDE FROM N-BUTANE

    公开(公告)号:KR790000806B1

    公开(公告)日:1979-07-12

    申请号:KR740004211

    申请日:1974-12-05

    Abstract: Maleic anhydride(I) was manufd. from butane by oxidn. over catalysts of high life and of the type VaPbVcOx (a,b = 0.1-10, c = 0.01-5, X = Numbers of O atom which satisfy the atomic value of other atoms) Thus, 33.6g V2O5 in 438ml concentrated HCl was treated with 31.3g VO2(C2H3O2) 2HO2, refluxed 1hr, treated with H3PO4, refluxed, dried, and used at 482≦̸C to prepare I in 47-50% yield from a 1:100 butane air mixt.

    CONJUGATE FILAMENT HAVING HIGH NITRILE CONTENT

    公开(公告)号:JPH11241225A

    公开(公告)日:1999-09-07

    申请号:JP35358898

    申请日:1998-12-11

    Abstract: PROBLEM TO BE SOLVED: To obtain a conjugate filament having high nitrile content, excellent in processability and useful for woven or knitted fabric, nonwoven fabric, or the like by including plural specific polymers arranged in core-sheath configuration. SOLUTION: This conjugate filament having high nitrile content comprises two or more kinds of polymers arranged in sheath/core configuration. The sheath polymer is selected from the group consisting of an acrylonitrile olefinic unsaturated polymer composed of 50-95 wt.% acrylonitrile monomer and 5-50 wt.% olefinic unsaturated monomer such as methyl methacrylate, an organic polymer such as a polypropylene and a combination thereof. The sheath component content is 99-1%, preferably 90-10% based on the filament. The core polymer is selected from the group consisting of the above acrylonitrile olefin-based unsaturated polymer, the above organic polymer and a combination thereof, but the core polymer is different in the composition from the sheath polymer. The core component content is 1-99%, preferably 10-90% and is thermally stable.

    PURIFICATION OF ACETONITRILE BY DISTILLING RECOVERY BY DISTILLATION AND ION EXCHANGE RESIN TREATMENT PROCESS

    公开(公告)号:JPH1135542A

    公开(公告)日:1999-02-09

    申请号:JP18375097

    申请日:1997-07-09

    Abstract: PROBLEM TO BE SOLVED: To obtain a highly purified acetonitrile applicable to chromatography in a few process and a low cost by subjecting crude acetonitrile as a by-product in producing acrylonitrile to distillation and an ion exchange resin treatment. SOLUTION: The objective compound is obtained by distilling crude CH3 CN by using three distilling columns having overhead reflux loops of respectively having a reflux ratio higher than (3:1), (3.4:1) and (6.4:1), in turn, under >=1 atm., to remove HCN and generating a bottom product containing (A) a CH3 CN/ water azeotropic mixture and water, separating the component A to (B) a CH3 CN/water azeotropic mixture having a higher CH3 CN concentration and a bottom product containing water under =1 atm., then generating a CH3 CN/water azeotropic mixture containing substantially whole amount of water derived from the component B, a bottom product containing CH3 CN and heavy organic compounds, and a side stream containing (C) a highly purified CH3 CN, thus purifying the component C by an acidic ion exchange resin.

    PREPARATION OF ACRYLONITRILE AND METHACRYLONITRILE

    公开(公告)号:JPH0747271A

    公开(公告)日:1995-02-21

    申请号:JP103491

    申请日:1991-01-09

    Abstract: PURPOSE: To provide high activity for preparation of unsatd. nitriles at a temp. lower than the conventionally used temp. by using a catalyst having the specified structure during ammoxidation of olefins into unsatd. nitriles. CONSTITUTION: Olefin selected from the group consisting of propylene, isobutylene and mixtures thereof is reacted with molecular oxygen contg. gas and ammonia in the gas phase at a temp. of about 260-600 deg.C at an increased pressure in the presence of an oxide catalyst, to convert it into corresponding acrylonitrile, methacrylonitrile and mixtures thereof. During which, the reaction is carried out in the presence of the catalyst having the formula: Aa Kb CSc Mgd Nie Fef Big Mo12 Ox (A is Co, Mn, Cr, P, Sb, Te, Na, Ce, W or mixtures thereof, a is a number of 0-5, b is a number of 0-0.4, c is a number of 0-0.4, provided that the total of b and c is 0.1-0.4, d-g are each 0.2-10, x is a number determined by valencies of other elements present).

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