Production of dithiodiglycol

Details Production of dithiodiglycol Production of dithiodiglycol

2005-05-17

2005-05-17

Price, Elvis O. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Sulfur containing

C568S018000, C568S020000, C568S021000, C568S061000, C568S062000, C568S063000

Reexamination Certificate

active

06894194

ABSTRACT:
In a process to make dithiodiglycol by oxidation of β-mercaptoethanol with sulfur, an improved product is recovered when a 1-10 mol % excess of β-mercaptoethanol is used and hydrogen sulfide is removed by vacuum or nitrogen sparge. A typical product contains 88.1 mol % (92.0 wt %) dithiodiglycol, 2.3 mol % (2.9 wt %) trithiodiglycol and 9.6 mol % (5.1 wt %) unreacted β-mercaptoethanol. Reaction of this product with 35 to 50 wt % solution hydrogen peroxide reduces residual β-mercaptoethanol to less than 0.02 wt % mercaptan. Residual water of about 3.6 wt % after hydrogen peroxide treatment is reduced to less than 1 wt % by vacuum stripping and/or nitrogen sparge or with a wiped film evaporator.

REFERENCES:
patent: 3299146 (1967-01-01), Gillette et al.
patent: 3755461 (1973-08-01), Kvasnikoff et al.
patent: 4067901 (1978-01-01), Gladstone et al.
patent: 4721813 (1988-01-01), Mark et al.
patent: 4937385 (1990-06-01), Buchholz et al.
patent: 5001269 (1991-03-01), Gongora et al.
patent: 5026915 (1991-06-01), Buchholz et al.
patent: 5068445 (1991-11-01), Arretz
patent: 5312993 (1994-05-01), Arretz
patent: 1 081 134 (2001-03-01), None
CPCHem,Material safety data sheet for di0(2-hydroxyethyl)disulfide(May 21, 2001) (CAS#1892-29-1).

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