Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1982-11-01
1984-04-03
Mars, Howard T.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C07C 4148, C07C 4158
Patent
active
044409591
ABSTRACT:
The invention relates to an improved process for the manufacture of chloroacetaldehyde dimethyl acetal in which low-boiling constituents are distilled off completely or partially from the reaction mixture obtained by the reaction of vinyl acetate and chlorine in stoichiometric amounts in the presence of excess methanol, when the addition of chlorine is complete. The remaining liquid residue is neutralized with solid substances, such as oxides or carbonates of calcium and magnesium, while maintaining a temperature of from 20.degree. to 60.degree. C., until the aqueous extract has a pH of greater than 5. When neutralization is complete, the reaction mixture is in the form of two separate liquid phases. Once the upper organic layer has been separated off, it is fractionally distilled, pure chloroacetaldehyde dimethyl acetal being obtained as the main fraction yields of more than 90%, calculated on the vinyl acetate used.
REFERENCES:
patent: 2330570 (1943-09-01), Filachione
patent: 2411826 (1946-11-01), Filachione
patent: 4130592 (1978-12-01), Vogt et al.
Filachione, J.A.C.S. 61 (1939) pp. 1705-1706.
Mars Howard T.
Wacker-Chemie GmbH
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