Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1993-06-09
1996-03-12
Straub, Gary P.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
423525, 423522, 423531, C07J 700, C01B 1790, C01B 1774
Patent
active
054987903
ABSTRACT:
A process for the preparation of sulfuric acid by burning the oxidizable components of a feed solution obtained as a byproduct of the preparation of 2-hydroxy-4-(methylthio)butyric acid ("HMBA") by hydrolysis of 2-hydroxy-4-(methylthio)butyronitrile ("HMBN"). A combustion gas containing sulfur dioxide is produced. The combustion gas is cooled to condense water and sulfuric acid, then mixed with a source of oxygen to produce a feed gas containing at least about 0.9 moles oxygen per mole sulfur dioxide. The feed gas is passed over a catalyst for the conversion of sulfur dioxide to sulfur trioxide at a temperature effective for the conversion. Sulfur trioxide may be absorbed in concentrated sulfuric acid to generate additional sulfuric acid which may be recycled and used for hydrolysis of HMBN in the preparation of HMBA. The process may be operated as a closed system in which ammonium bisulfate byproduct of HMBA manufacture is used as the source of sulfur for the generation of sulfuric acid used in the hydrolysis of HMBN to HMBA.
REFERENCES:
patent: 2745745 (1956-05-01), Blake et al.
patent: 3175000 (1965-03-01), Gielkens et al.
patent: 3359069 (1967-12-01), Furkert et al.
patent: 3419601 (1968-12-01), Isbell, Jr.
patent: 3549320 (1970-12-01), Isbell
patent: 3647360 (1972-03-01), Jaeger
patent: 3773927 (1973-11-01), Cummins
patent: 3803805 (1974-04-01), Low
patent: 3825657 (1974-07-01), Jenniges
patent: 3954955 (1976-05-01), Furkert
patent: 3991047 (1976-11-01), Moudry et al.
patent: 4049646 (1977-09-01), Furkert
patent: 4054562 (1977-10-01), Furkert
patent: 4153628 (1979-05-01), Gerken et al.
patent: 4177248 (1979-12-01), Richard
patent: 4208390 (1980-06-01), Hirabayashi et al.
patent: 4212855 (1980-07-01), Kerner et al.
patent: 4256721 (1981-03-01), Blakey et al.
patent: 4310690 (1982-01-01), Cummins
patent: 4333917 (1982-06-01), Dorr et al.
patent: 4376107 (1983-03-01), Morgenthaler
patent: 4490347 (1984-12-01), Gelblum
patent: 4524077 (1985-06-01), Ruest et al.
patent: 4678655 (1987-07-01), Twardowski
patent: 4912257 (1990-03-01), Hernandez et al.
patent: 5082645 (1992-01-01), Al-Samadi et al.
Rooij, et al., "Caprolactam Without Any Ammonium Sulfate Byproduct," Mar. 18, 1974, Chemical Engineering.
Food Chemicals Codex, Third Edition, Washington, D.C., National Academy Press, 1981, pp. xvii-xxv, 1-5, 317-318, 571-574.
Austin, George T., "Shreve's Chemical Process Industries" (McGraw-Hill, 1984), pp. 340-343, TP145.S5.
International Search Reprot for PCT Application PCT/US93/10028, filed Oct. 21, 1993, corresponding to U.S. Patent application Ser. No. 08/073,877.
Phillips, Tony-"On Site" Alkylation Spent Acide Regeneration Amsterdam, Netherlands, May 30-31, 1991.
Chemical Marketing Reporter, "Degussa Starts Facility To Recycle Sulfuric Acid", Aug. 16, 1982.
V. A. Preobrashenskii and A. M. Flaksman, "Removal of Organic Impurities From Solutions of Sulfuric Acid and Ammonium Sulfate", The Soviet Chemical Industry, 12:3 (1980), pp. 272-276 and 278-280.
Author-Unknown-"DSM Develops Process Aiming at Total Oleum Regeneration"; Sulphur, Sep./Oct. 1973, p. 33.
"TACB/PSD Permit Application Spent Acid Regeneration Plant", filed by Monsanto Company, Oct., 1992.
Grendel Robert W.
Klopfenstein Jeffrey B.
Prokop Robin K.
Reid Stanley L.
Willock J. Michael
Novus International, Inc.
Straub Gary P.
LandOfFree
Regeneration of sulfuric acid from sulfate by-products of 2-hydr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Regeneration of sulfuric acid from sulfate by-products of 2-hydr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Regeneration of sulfuric acid from sulfate by-products of 2-hydr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2101607