Polycondensates of sulfonated coal tar fractions

Details Polycondensates of sulfonated coal tar fractions Polycondensates of sulfonated coal tar fractions

1987-01-02

1988-05-17

Sneed, Helen M. S.

Mineral oils: processes and products

Asphalts, tars, pitches and resins; making, treating and...

Chemical modification of asphalt, tar, pitch or resin

208 14, 208 22, 106274, 106284, C10C 306

Patent

active

047448822

ABSTRACT:
A simpler and new process for the polycondensation of a sulfonated coal tar fraction comprising: sulfonating a coal tar fraction having a distillation range of 200.degree. to 240.degree. at normal pressure, with an excess of 20-30% mole of sulfuric acid, as opposed to 105% in the prior art, for 4-8 hours at a temperature of 160.degree. C..+-.10.degree. C. under reflux. The product is diluted with water to render it fluid at about 80.degree. C. and molar ratio of formaldehyde per mole of the sulfonated coal tar fraction is then added gradually at a temperature of about 85.degree. C..+-.5.degree. C., then gradually heated for about 1 to 4 hours at 100.degree. to 106.degree. C., and then further raised to 106.degree. C.-120.degree. C. for 2 to 4 hours. The product is then cooled and neutralized. With this process, new polycondensates with improved properties are produced. The polycondensation including neutralization is completed within 16 hours from the time the formaldehyde is added.

REFERENCES:
patent: 1353003 (1920-09-01), White, Jr.
patent: 2299469 (1942-10-01), D'Antul
patent: 2354868 (1944-08-01), McKinney
patent: 2447004 (1948-08-01), Gamson
patent: 2560642 (1951-07-01), Greeves et al.
patent: 3108060 (1963-10-01), Matthews, II
patent: 3130144 (1964-04-01), Bostwick et al.
patent: 3152978 (1964-10-01), Fierce et al.
patent: 3238182 (1966-03-01), Goodrich
patent: 3275585 (1966-09-01), Baum et al.
patent: 3493404 (1970-02-01), Koons
patent: 3509038 (1970-04-01), Corbett
patent: 3600298 (1971-08-01), Mayumi et al.
patent: 3973971 (1976-08-01), Greco et al.
patent: 4024076 (1977-05-01), Miyaki et al.
patent: 4260423 (1981-04-01), Thomas
patent: 4559128 (1985-12-01), Goodrich

Affiliated with

Also associated with

Rating

Polycondensates of sulfonated coal tar fractions does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polycondensates of sulfonated coal tar fractions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polycondensates of sulfonated coal tar fractions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1880026