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:
Mar. 01, 2011
Filed:
Mar. 08, 2006
Masaaki Sasaki, Kamisu, JP;
Takao Naito, Kamisu, JP;
Fumiaki Hirata, Sodegaura, JP;
Masato Saruwatari, Omuta, JP;
Hirofumi Takahashi, Kamisu, JP;
Kouji Maeba, Kamisu, JP;
Tsugio Imaizumi, Kamisu, JP;
Takuya Saeki, Omuta, JP;
Takashi Yamaguchi, Omuta, JP;
Kouichirou Terada, Omuta, JP;
Masaaki Sasaki, Kamisu, JP;
Takao Naito, Kamisu, JP;
Fumiaki Hirata, Sodegaura, JP;
Masato Saruwatari, Omuta, JP;
Hirofumi Takahashi, Kamisu, JP;
Kouji Maeba, Kamisu, JP;
Tsugio Imaizumi, Kamisu, JP;
Takuya Saeki, Omuta, JP;
Takashi Yamaguchi, Omuta, JP;
Kouichirou Terada, Omuta, JP;
Mitsui Chemicals, Inc., Minato-ku, Tokyo, JP;
Abstract
A polyisocyanate production method that can allow effective use of hydrogen chloride produced secondarily in a polyisocyanate production process, while allowing reduction of environmental burdens, and a polyisocyanate production system for performing the polyisocyanate production method. After chlorine is allowed to react with carbon monoxide to produce carbonyl chloride in a carbonyl chloride producing reactor, the carbonyl chloride produced in the carbonyl chloride producing reactor is allowed to react with polyamine in an isocyanate producing reactor to produce polyisocyanate. Then, after hydrochloric gas produced secondarily in the isocyanate producing reactor is purified in a hydrogen chloride purifying column, the purified hydrochloric gas is oxidized in a hydrogen chloride oxidizing reactor to produce chlorine. Thereafter, the chlorine thus produced is supplied to the carbonyl chloride producing reactor from a chlorine resupply line, so that it is allowed to react with carbon monoxide to produce carbonyl chloride.