The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 11, 1978
Filed:
Oct. 06, 1976
Fred A Sherrod, Freeport, TX (US);
Bobby R Ezzell, Angleton, TX (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
The title compounds correspond to formulas O--CH.sub.2 CH.sub.2 NH.sub.3.sup..sym.).sub.2.2HSO.sub.4.sup..crclbar. and )--CH.sub.2 CH.sub.2 NH.sub.3.sup..sym.).sub.2 SO.sub.4.sup..crclbar.. They are prepared by (A) reacting by contacting HOCH.sub.2 CH.sub.2 NH.sub.3.sup..sym. HSO.sub.4.sup..crclbar. with .sup..sym. NH.sub.3 CH.sub.2 CH.sub.2 O--SO.sub.3.sup..crclbar. in the presence of a catalytic amount of sulfuric acid at a temperature greater than about 140.degree. C, thereby forming a reaction product comprising O--CH.sub.2 CH.sub.2 NH.sub.3.sup..sym.).sub.2. 2HSO.sub.4.sup..crclbar. ; and (B) reacting by contacting the reaction product of step (A) or O--CH.sub.2 CH.sub.2 NH.sub.3.sup..sym.).sub.2 . 2HSO.sub.4.sup..crclbar. with a methanol solution of HOCH.sub.2 CH.sub.2 NH.sub.2, thereby forming O--CH.sub.2 CH.sub.2 NH.sub.3.sup..sym.).sub.2 SO.sub.4.sup..crclbar. as a solid precipitate. The latter compound is extremely useful as a chemical intermediate in forming bis(2-aminoethyl) ether.