Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition – Control element responds proportionally to a variable signal...
Patent
1977-07-26
1980-01-22
Turk, Arnold
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
Control element responds proportionally to a variable signal...
260524R, 364500, 422189, 422225, 422235, 562414, B01J 100
Patent
active
041850734
ABSTRACT:
Continuous production of iso- or terephthalic acid in a stirred reaction zone by catalytic air oxidation of m- or p-xylene in the presence of a benzoic acid-water liquid solvent system at constant gauge pressure within the range of 7 to 21 kg/cm.sup.2 wherein oxidation temperature within the range of 175.degree. to 235.degree. C. is maintained substantially constant by the novel control thereof by only varying the flow rate of water condensate reflux to the oxidation zone. The invention further pertains to novel means for achieving such temperature control.
Also, the present invention relates to a novel continuous recovery of the phthalic acid product from the fluid effluent of said continuous process by a process wherein crystalline phthalic acid product is separated from essentially water-free benzoic acid mother liquor; the crystalline product is successively washed with liquid benzoic acid and the corresponding xylene; the washed product is dried; and the water removed from said fluid effluent, the benzoic acid and xylene wash liquors, xylene recovered from product drying, and a major proportion of the benzoic acid mother liquor are charged to the oxidation process.
The invention further relates to a novel combination of apparatus for the continuous conduct of said oxidation and recovery processes.
REFERENCES:
patent: 3150172 (1964-09-01), Serres, Jr. et al.
patent: 3254071 (1966-05-01), Morgan et al.
patent: 3442767 (1969-05-01), Hall
patent: 3705787 (1972-12-01), Carli et al.
patent: 3839435 (1974-10-01), Shigeyasu et al.
patent: 3839436 (1974-10-01), Longland, Jr.
patent: 3846487 (1974-11-01), Shigeyasu et al.
patent: 3859344 (1975-01-01), Shigeyasu et al.
patent: 3887612 (1975-06-01), Shigeyasu et al.
Perry, "Chemical Engineers' Handbook-4th Ed.", McGraw-Hill Book Co., 1963; pp. 22-63 to 22-76.
Marsh David R.
Stark Leonard E.
Ahlers Fred R.
Gilkes Arthur G.
McClain William T.
Standard Oil Company (Indiana)
Turk Arnold
LandOfFree
Apparatus for iso- or terephthalic acid production in and recove does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for iso- or terephthalic acid production in and recove, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for iso- or terephthalic acid production in and recove will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-334335