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    TEREPHTHALIC ACID RECOVERY BY CONTINUOUS FLASH CRYSTALLIZATION
    43.
    发明授权
    TEREPHTHALIC ACID RECOVERY BY CONTINUOUS FLASH CRYSTALLIZATION 失效

    公开(公告)号：KR810001026B1

    公开(公告)日：1981-08-31

    申请号：KR740003367

    申请日：1974-08-20

    Applicant: STANDARD OIL CO

    Inventor： FISHER J

    IPC: C07C51/42 ,  C07C63/26

    Abstract: For the recovery of crystalline terephthalic acid product having a miximum p-toluic acid content not exceeding 150 ppm from a liquid aq. soln. substantially satd. with terephthalic acid contg. 500-6000 ppm of p-toluic acid at a temp. in the range of 400-550oF, the improved process comprising continuously charging such aq. soln. to the first of two or more series connected flash solvent evaporation and stirred crystn. zones each operated at a successively lower temp. wherein at least the zones operated at a temp. within and below the range of 360-320oF crystallize decreasing proportions of originally dissolved terephthalic acid.

    SYNTHESIS OF MALEIC ANHYDRIDE
    44.
    发明授权
    SYNTHESIS OF MALEIC ANHYDRIDE 失效

    公开(公告)号：KR810000376B1

    公开(公告)日：1981-04-24

    申请号：KR780000935

    申请日：1978-04-03

    Applicant: STANDARD OIL CO LTD THE

    Inventor： WONG E ,  MILBERGER E

    IPC: C07D307/60

    Abstract: Title compds. (I) were manufd. by contacting unsatd. org. compds. with O2 at 250-600≦̸C in the presence of catalyst(II; A = Nb, Zr, Ti, Ta; E = hydrazinehydrate, Mo powder, W, Mg, Al, or Ni; a = 0.01-6, C = 0-0.2, e,f = 1-9; X = Number which satisfies other element's valence). Thus, passing 73:1 air-C4H10 over this catalyst at 419≦̸C gives I with conversion 75.37%.

    PREPARATION OF MALEIC ANHYDRIDE
    45.
    发明授权
    PREPARATION OF MALEIC ANHYDRIDE 失效

    公开(公告)号：KR810000332B1

    公开(公告)日：1981-04-20

    申请号：KR780000936

    申请日：1978-04-03

    Applicant: STANDARD OIL CO OHIO

    Inventor： BREMER N ,  MILBERGER E ,  WONG E

    IPC: C07D307/60

    Abstract: Maleic anhydride was prepd. by oxydation of n-butane, n-butene, 1,3-butadiene or these compd.'s mixt. with O2 at 250 - 600≦̸C vapor phase in the presence of improved catalyst which was composed of oxide of Ti and P necessarily and didn't comprised Ba. Thus, titanium dioxide 19.98 g, 85.4% phosphoric acid 28.69 g, vanadium pentoxide 84.2 g and distilled water 600 ml were mixed to make slurry. This aq. slurry was refluxed for 2 hr, evapd., dried at 110≦̸C for 12 hr, calcined at 427≦̸C for 2 hr and crushed to 10 - 30 mesh to give Til.OP1.0-Ox useful catalyst.

    XYLENE-FORMALDEHYDE RESIN COMPOSITION AND PROCESS
    46.
    发明授权
    XYLENE-FORMALDEHYDE RESIN COMPOSITION AND PROCESS 失效

    公开(公告)号：KR800001710B1

    公开(公告)日：1980-12-31

    申请号：KR770001947

    申请日：1977-08-22

    Applicant: STANDARD OIL CO OHIO

    Inventor： BALL L ,  AZIZ W ,  ROSEN I

    IPC: C08G10/02

    Abstract: Title resin with high mol. wt., low content, and high m. p., was prerd. by treating xylene with HCHO in the presence of an acid catalyst in a closed reaction vessel in the absened of air. Thus, 212 g m-xylene and 63.15 g p-formaldehyde were heated in a closed reaction vessel in the absence of air to 900C, mixed with 9.19 g HCIO4 and heated 3 hr while water was removed, giving after purifn. a polymer with softening point 1650C, glass temp. 1230C, mol. wt. 20,400, Gardner color 2, Brabender plasticorder torque at 35 rpm 830-650 mg after 13 min at 1800C, intrinsic viscosilty 0.12, and shore D hardness 84.

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