Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Patent
1994-02-18
1995-01-17
Siegel, Alan
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
570177, 570178, C07C 2200, C07C 1738
Patent
active
053827252
ABSTRACT:
1,3-dihalobenzene, particularly 1,3-dichlorobenzene, is produced in high efficiency from a mixture containing the subject compound and its corresponding 1,4-isomer by a special process in which the dihalobenzene mixture is treated with polyethylene glycols of varying molecular weight and the resulting slurry is filtered to remove a complex of 1,4-dihalobenzene and polyethylene glycol as a solid and the 1,3-dihalobenzene as the filtrate.
The 1,4-dihalobenzene complexed with the polyethylene glycol can be recovered by a flash distillation under vacuum and the residue containing the polyethylene glycol can be recycled.
The purity of the 1,3-dihalobenzene obtained by this process can further be improved by subjecting the product obtained after the polyethylene glycol treatment to a low temperature crystallization process where 1,3-dihalobenzene can be selectively crystallized to a purity of above 99%.
REFERENCES:
patent: 2798891 (1957-07-01), Schaeffer et al.
patent: 2958708 (1960-11-01), Fleck et al.
patent: 3170961 (1965-02-01), Britton et al.
patent: 4996380 (1991-02-01), McCulloch et al.
Desai Kantilal B.
George Jacob
Schoeffler Francis M.
Siegel Alan
Standard Chlorine of Delaware Inc.
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