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:
May. 18, 2010
Filed:
Mar. 17, 2006
Masaaki Sasaki, Kamisu, JP;
Hirofumi Takahashi, Omuta, JP;
Kouji Maeba, Kamisu, JP;
Takao Naito, Kamisu, JP;
Kouichirou Terada, Kuga-gun, JP;
Takashi Yamaguchi, Minato-ku, JP;
Takuya Saeki, Minato-ku, JP;
Masaaki Sasaki, Kamisu, JP;
Hirofumi Takahashi, Omuta, JP;
Kouji Maeba, Kamisu, JP;
Takao Naito, Kamisu, JP;
Kouichirou Terada, Kuga-gun, JP;
Takashi Yamaguchi, Minato-ku, JP;
Takuya Saeki, Minato-ku, JP;
Mitsui Chemicals, Inc., Minato-Ku, Tokyo, JP;
Abstract
A polyisocyanate production system is provided that can stably produce chlorine from hydrogen chloride produced secondarily while reacting stably between carbonyl chloride and polyamine and can perform an effective treatment of the hydrochloric gas produced secondarily. A hydrochloric gas control unitcontrols a flow-rate control valveto keep constant an amount of hydrogen chloride supplied from a hydrogen chloride purifying tankto a hydrogen chloride oxidation reactorvia a second hydrochloric-gas connection lineto be constant, and also controls a pressure control valvebased on an inner pressure of the hydrogen chloride purifying tankinput from a pressure sensorto discharge the hydrochloric gas from the hydrogen chloride purifying tankto the hydrogen chloride absorbing columnvia a first hydrochloric-gas connection line, so as to keep an inner pressure of the hydrogen chloride purifying tankto be constant.