Method and apparatus for preparing purified terephtalic acid

Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

562485, 562414, 562483, 562409, C07C 51487

Patent

active

057673110

ABSTRACT:
A method and apparatus for purifying crude terephthalic acid from a liquid dispersion thereof also containing impurities selected from unreacted starting materials, solvents, products of side reactions and/or other undesired materials is provided. The method comprises the steps of filtering the dispersion to form a crude terephthalic acid filter cake, dissolving the filter cake in a selective crystallization solvent at an elevated temperature to form a solution, crystallizing purified terephthalic acid from the solution in the crystallization solvent by reducing the temperature of the solution, and separating the crystallized purified terephthalic acid from the solution. According to the invention, the selective crystallization solvent is non-aqueous, non-corrosive and essentially non-reactive with terephthalic acid. Preferably, the selective crystallization solvent is N-methyl pyrrolidone. The method and apparatus produces purified terephthalic acid having a purity desired for use in forming polyester resin and other products at an economically attractive rate and at operating conditions of reduced severity which require a lower capital investment and simplified processing.

REFERENCES:
patent: 2636899 (1953-04-01), Burrows et al.
patent: 2833816 (1958-05-01), Saffer et al.
patent: 2833817 (1958-05-01), Saffer et al.
patent: 2891992 (1959-06-01), Raecks et al.
patent: 2905709 (1959-09-01), Scheak et al.
patent: 2923736 (1960-02-01), Maclean
patent: 2949483 (1960-08-01), Ham
patent: 3330863 (1967-07-01), Read et al.
patent: 3388156 (1968-06-01), Sakurai et al.
patent: 3431296 (1969-03-01), Ichikawa et al.
patent: 3465035 (1969-09-01), Nakaguchi et al.
patent: 3497552 (1970-02-01), Olsen
patent: 3574727 (1971-04-01), Taylor et al.
patent: 3584039 (1971-06-01), Meyer
patent: 3766257 (1973-10-01), Wimer et al.
patent: 3766258 (1973-10-01), Engelbrecht et al.
patent: 3859344 (1975-01-01), Shigeyasu et al.
patent: 3953502 (1976-04-01), Fassell et al.
patent: 4053506 (1977-10-01), Park et al.
patent: 4081464 (1978-03-01), Marsh et al.
patent: 4165337 (1979-08-01), Yoshinaka et al.
patent: 4197412 (1980-04-01), Kimura et al.
patent: 4201871 (1980-05-01), Tanouchi et al.
patent: 4201872 (1980-05-01), Kimura et al.
patent: 4228299 (1980-10-01), Ferguson et al.
patent: 4230882 (1980-10-01), Seko et al.
patent: 4245078 (1981-01-01), Suzuki et al.
patent: 4260817 (1981-04-01), Thompson et al.
patent: 4263452 (1981-04-01), Komatsu et al.
patent: 4268690 (1981-05-01), Komatsu et al.
patent: 4275230 (1981-06-01), Donaldson
patent: 4281179 (1981-07-01), Komatsu et al.
patent: 4286101 (1981-08-01), Hashizume et al.
patent: 4297507 (1981-10-01), Komatsu et al.
patent: 4314073 (1982-02-01), Crooks
patent: 4317923 (1982-03-01), Imai
patent: 4331824 (1982-05-01), Ikeda et al.
patent: 4334090 (1982-06-01), Donaldson
patent: 4340752 (1982-07-01), List et al.
patent: 4345089 (1982-08-01), Nagura et al.
patent: 4357475 (1982-11-01), Hanotier et al.
patent: 4380662 (1983-04-01), Hanotier et al.
patent: 4415479 (1983-11-01), Puskas et al.
patent: 4438279 (1984-03-01), Packer et al.
patent: 4447646 (1984-05-01), Johnson et al.
patent: 4459418 (1984-07-01), Greenshields
patent: 4467110 (1984-08-01), Puskas et al.
patent: 4467111 (1984-08-01), Puskas et al.
patent: 4485244 (1984-11-01), Fox et al.
patent: 4490554 (1984-12-01), Tanaka et al.
patent: 4500732 (1985-02-01), Petty-Weeks et al.
patent: 4537980 (1985-08-01), Greenshields
patent: 4540493 (1985-09-01), Dickerson et al.
patent: 4605763 (1986-08-01), Kiefer et al.
patent: 4625059 (1986-11-01), Shibano et al.
patent: 4626598 (1986-12-01), Packer et al.
patent: 4629715 (1986-12-01), Schroeder
patent: 4652674 (1987-03-01), James et al.
patent: 4675108 (1987-06-01), Dickerson et al.
patent: 4675438 (1987-06-01), Schwartz et al.
patent: 4728630 (1988-03-01), Schroeder et al.
patent: 4772748 (1988-09-01), Hashizume et al.
patent: 4782181 (1988-11-01), James
patent: 4791226 (1988-12-01), Puskas et al.
patent: 4808751 (1989-02-01), Schroeder et al.
patent: 4827026 (1989-05-01), Brugge et al.
patent: 4833269 (1989-05-01), Schroeder
patent: 4877900 (1989-10-01), Tamaru et al.
patent: 4886901 (1989-12-01), Holzhauer et al.
patent: 4892972 (1990-01-01), Schroeder et al.
patent: 4933491 (1990-06-01), Albertins et al.
patent: 4933492 (1990-06-01), Schroeder et al.
patent: 4937378 (1990-06-01), Schroeder
patent: 4939297 (1990-07-01), Browder et al.
patent: 4948921 (1990-08-01), Green et al.
patent: 5068410 (1991-11-01), Tanaka et al.
patent: 5095144 (1992-03-01), Sato et al.
patent: 5095145 (1992-03-01), Rosen
patent: 5095146 (1992-03-01), Zeitlin et al.
patent: 5097066 (1992-03-01), Holzhauer et al.
patent: 5107020 (1992-04-01), Reeve
patent: 5110984 (1992-05-01), Janulis
patent: 5113015 (1992-05-01), Palmer et al.
patent: 5132450 (1992-07-01), Tanaka et al.
patent: 5159109 (1992-10-01), Rosen et al.
patent: 5166420 (1992-11-01), Shiraki et al.
patent: 5169977 (1992-12-01), Tanaka et al.
patent: 5175352 (1992-12-01), Iwane et al.
patent: 5175355 (1992-12-01), Streich et al.
patent: 5183933 (1993-02-01), Harper et al.
patent: 5189209 (1993-02-01), Ohta et al.
patent: 5200557 (1993-04-01), Gee et al.
patent: 5254719 (1993-10-01), Holzhauer et al.
patent: 5256817 (1993-10-01), Sikkenga et al.
patent: 5292934 (1994-03-01), Sikkenga et al.
patent: 5304676 (1994-04-01), Hindmarsh et al.
patent: 5306845 (1994-04-01), Yokohama et al.
patent: 5344969 (1994-09-01), Iwane et al.
patent: 5354898 (1994-10-01), Schroeder
patent: 5362908 (1994-11-01), Schroeder et al.
Tr. Vses. Nauch.-Issled. Proekt. Inst. Monomerov (1970), 2(2), 26-32; From: Ref. Zh., Khim. 1971, Abstr. No. 1N166; V.N. Kulakov, et al.; "Purification of Aromatic Dicarboxylic Acids Obtained by Liquid-Phase Oxidation of Dialkyl Derivatives of Aromatic Hydrocarbons".
Kulakov et al ;ZH.,Khim. Abstr. No. 1N166, 1971.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method and apparatus for preparing purified terephtalic acid does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for preparing purified terephtalic acid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for preparing purified terephtalic acid will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1727377

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.