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:
Dec. 26, 1978
Filed:
Aug. 25, 1977
Maciej Kiedik, Gliwice, PL;
Edward Grzywa, Warsaw, PL;
Jozef Kolt, Zabrze, PL;
Kazimierz Terelak, Kedzierzyn-Kozle, PL;
Jerzy Czyz, Kedzierzyn-Kozle, PL;
Anna Niezgoda, Kedzierzyn-Kozle, PL;
Instytut Ciezkiej Syntezy Organicznej 'Blachownia', Kedzierzyn-Kozla, PL;
Abstract
The essence of the invention consists in heating the dian waste in the presence of sodium hypophosphite as a catalyst in amount of 0.01 - 0.5% by weight at a temperature of 150 to 250.degree. C and under reduced pressure in the range of 5 to 50 mm Hg. As a result a destillate is obtained containing as main components phenol, o- and p-isopropenyl-phenol and their dimers at yield of about 40-74% by weight calculated in relation to the initial amount of dian waste. The distillate obtained was made up with fresh phenol or with phenol and acetone and brought into contact with strongly acid cation exchanger, such as Wofatit KPS, Zerolit 225, Wofatit OK-80, in consequence the o- and p-isopropenylphenol and their dimers reacted with phenol to obtain the dian, the latter being then separated by known methods.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile