Urea → Carbamic acid, (2-butoxyethyl)ester

温度

135 °C

60 parts of urea are mixed with 177 parts of butylglycol and 3 parts of a cation exchanger which is commercially available under the registered name Lewatit CA 9259 and, having been treated in accordance with Example (1 a), contains nickel, in a stirred apparatus. The mixture is heated to 135° C., whilst stirring. It is then heated for 10 hours at 140° C. After cooling, the mixture is filtered and the excess butylglycol is distilled from the filtrate under reduced pressure. 158 parts of n-butoxyethyl carbamate (corresponding to 98% of theory, based on urea) are obtained. On distillation of the end product in a high vacuum, a residue of only 0.9% by weight is left. The pure butoxyethyl carbamate has a boiling point 118°-120° C. at 0.2 mm Hg.

1. temperatureIt is then heated for 10 hours at 140° C
2. temperatureAfter cooling
3. filtrationthe mixture is filtered
4. distillationthe excess butylglycol is distilled from the filtrate under reduced pressure

ORDレコード

ord-b2f605f8e7b74eff9c2e3e6670945b4d

出典データセット

uspto-grants-1979_05

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US04156784