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. 22, 2003
Filed:
Sep. 21, 2001
Applicant:
Inventors:
Yoshihisa Oka, Chigasaki, JP;
Kenichi Takematsu, Yokohama, JP;
Assignee:
Nippon Shokubai Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B08B 9/00 ;
U.S. Cl.
CPC ...
B08B 9/00 ;
Abstract
There is provided a method of efficiently removing polymer stuck to the inside and/or on the surface of packings of a distillation tower, when nitrogen-containing polymerizable monomers (for example, ethyleneimine) are distilled. Said method consists of washing the inside and/or packings of a distillation tower with an acidic liquid (for example, aqueous solution of acetic acid).