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. 12, 1977
Filed:
Apr. 18, 1975
Boris Nikolaevich Gorbunov, Volgograd, SU;
Galina Dmitrievna Efremova, Volgograd, SU;
Evgeny Maximovich Kukartsev, Volzhsky Volgogradskoi, SU;
Lidia Vladimirovna Erokhina, Volzhsky Volgogradskoi, SU;
Anatoly Ivanovich Lukashov, Moscow, SU;
Vitaly Vasilievich Orlyansky, Volzhsky Volgogradskoi oblasti, SU;
Alexandr Pavlovich Khardin, Volgograd, SU;
Ideya Antonovna Churikova, Volzhsky Volgogradskoi oblasti, SU;
Daniil Iosifovich Valdman, Volzhsky Volgogradskoi oblasti, SU;
Other;
Abstract
The method of preparing 4,4-dimethyldioxane-1,3 consists in the interaction of isobutylene and formaldehyde in an aqueous medium at from 90.degree. to 115.degree. C in the presence of a catalyst, the capacity of which such inorganic salts of mineral acids may be used with the pH value of the aqueous solutions whereof being within 2.2 to 4.5, resulting in the formation of an organic and an aqueous phase containing the end product, followed by the separation of said phases, washing the organic phase with water, and isolation of the end product. When a catalyst of such salts is used, the acidity of the aqueous solutions of which is either invariable or decreases with an increase in the salt concentration, it is expedient that the aqueous phase and the wash water be evaporated to a level of from 85 to 90 percent to form a fraction containing the unreacted formaldehyde, and a distillation residue which is in fact an oil bed and a salt bed with the latter, after having been separated, being returned to the stage of interaction of the starting reagents.