Organic compounds -- part of the class 532-570 series – Organic compounds – Isocyanate esters
Reexamination Certificate
2011-03-01
2011-03-01
Sullivan, Daniel M (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Isocyanate esters
Reexamination Certificate
active
07897805
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.
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Notification Concerning Transmittal of International Preliminary Report on Patentability (Form PCT/IB/326), International Preliminary Report on Patentability (Form PCT/IB/373), Written Opinion of the International Search Authority (Form PCT/ISA/237) mailed in corresponding International Patent Application No. PCT/JP2006/304447, Sep. 20, 2007, The International Bureau of WIPO, Geneva, CH.
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Office Action issued on Dec. 21, 2010, in corresponding Japanese Patent Application No. 2005-068264.
Hirata Fumiaki
Imaizumi Tsugio
Maeba Kouji
Naito Takao
Saeki Takuya
Buchanan & Ingersoll & Rooney PC
Mitsui Chemicals Inc.
Sullivan Daniel M
Valenrod Yevegeny
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