PRODUCTION METHOD OF ISOCYANATE

Japanese Patent JP2007023034

A

To provide a production method of an isocyanate, in which chlorine is formed from hydrogen chloride produced at a phosgenation step and is recycled.

The isocyanate is produced by (a) reacting chlorine with carbon monoxide to produce phosgene; (b) reacting the phosgene with an organic amine to form an isocyanate and hydrogen chloride; (c) separating the isocyanate and the hydrogen chloride; (d) arbitrarily purifying the hydrogen chloride; (e) preparing an aqueous hydrogen chloride solution; (f) arbitrarily purifying the aqueous hydrogen chloride solution; (g) subjecting the aqueous hydrogen chloride solution to an electrochemical oxidation treatment to form chlorine; and (h) returning at least a part of the chlorine produced in (g) to (a). In the production method, energy can be saved by suppressing the complicated circulation of a solvent and phosgene to the minimum.

WO/2012/121291	PENTAMETHYLENE DIISOCYANATE, METHOD FOR PRODUCING PENTAMETHYLENE DIISOCYANATE, POLYISOCYANATE COMPOSITION, POLYURETHANE RESIN, AND POLYUREA RESIN
JP4469630	Method for producing diisocyanate
WO/2019/048644	PROCESS FOR QUENCHING A GASEOUS REACTION MIXTURE OBTAINED IN THE GAS PHASE PHOSGENATION OF DIAMINES

BULAN ANDREAS
WEBER RAINER
LORENZ WOLFGANG
MOORMANN GERHARD
KAEMPER FRIEDHELM
KEGGENHOFF BERTHOLD

JP2006191633A

February 01, 2007

July 12, 2006

Click for automatic bibliography generation  

BAYER MATERIALSCIENCE AG

C07C263/10; C01B7/01; C01B7/07; C01B32/80; C07C265/14

JP2001516333A	2001-09-25
JP2003500548A	2003-01-07
JP2004345884A	2004-12-09
JP2001059195A	2001-03-06

US20040069621A1	2004-04-15
WO2004056758A1	2004-07-08
US20040024244A1	2004-02-05

Hidekazu Miyoshi
Masakazu Ito
Yuko Hara

Previous Patent: METHOD FOR PRODUCING m-TOLUENEDIAMINE OR m-TOLUENE DIISOCYANATE

Next Patent: LIP MAKEUP COMPOSITION CONTAINING LOW-MOLECULAR WEIGHT RESIN AND HAVING GOOD ENDURANCE