[12] Patent
[11] Patent No.:GC0004566  
[45] Date of Publishing the Grant of the Patent: 31/Dec /2016                32/2016  
Number of the Decision to Grant the Patent:2016/90185
Date of the Decision to Grant the Patent:27/Dec/2016

[21] Application No.:GCC/P/2009/14886

[22] Filing Date:9/12/2009

[30] Priority:

[33] State [32] Priority date [31] Priority No.
DE
11/12/2008
102008061686

[72] Inventors:1- Dr. Klaus BISKUP ،2- Dr. Rainer BRUNS ،3- Dr. Wolfgang LORENZ ،4- Dr. Fritz POHL ،5- Friedhelm STEFFENS ،6- Dr. Volker MICHELE

[73] Owner: BAYER MATERIALSCIENCE AG, Communications, Building K12 , LEVERKUSEN 51368, Germany

[74] Agent: Suleiman I. Al-Ammar Law Office

  

 

  

[51]IPC:
Int. Cl.: C07C 263/10, C07C 265/14 (2006.01)

[56] Cited Documents:

-US 2009221846 A1 (BASF AG) 03 September 2009
-US 5391683 A (RHONE POULENC CHIM) 21February 1995
-US 5449818 A (BAYER AG) 12 September 1995
-US 5449818 A (BAYER AG) 12 September 1995
 
Examiner: Nouf AlNassban

[54] PROCESS FOR THE PREPARATION OF ISOCYANATES IN THE GAS PHASE
[57] Abstract: Aromatic isocyanates are produced by reacting one or more aromatic primary amines with phosgene in the gas phase. The phosgene and primary aromatic amine(s) are reacted at a temperature above the boiling temperature of the amine(s) in a reactor having a reaction space which is essentially rotationally symmetric to the direction of flow. The flow rate, averaged over the cross-section, of the reaction mixture along the axis of the essentially rotationally symmetric reaction space in the section of the reaction space in which the conversion of the amine groups into isocyanate groups is between 4 and 80 % is not more than 8 m/sec. The flow rate averaged over the cross-section of the reaction mixture along the axis of the essentially rotationally symmetric reaction space in the section of the reaction space in which the conversion of the amine groups into isocyanate groups is 4 to 80 % is always below the flow rate averaged over the cross-section at the start of this section.
No. of claims: 14     No. of figures: 1


 

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