US 2010/0137634 A1Published application

Hole jet reactor and a process for the preparation of an isocyanate using the reactor

AssigneeNingbo Wanhua Polyurethanes Co., Ltd.

InventorsJiansheng Ding, Yong hua Shang, Deqiang Ma, Jingquan Hao, Peicheng Luo, Shuang Hu

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Abstract

The present invention relates to a hole-jetting type reactor and its applications, in particular to a process for the production of isocyanates by the phosgenation of aliphatic or aromatic diamines or triamines in the gas phase using this reactor. The present invention achieves a good mixing and reacting result of the gas-phase phosgenation reaction at a high temperature by improving the mixing of reactants in the reactor to reduce the possibility of forming swirls and eliminate negative pressure produced at a local jet area, which can finally reduce back-mixing and formation of solid by-products.

Claims17

Dependent claims

A hole-jetting type reactor, comprising an internal feed tube, and an external feed tube coaxial with the internal feed tube;

wherein an annular space is defined between the two above-mentioned feed tubes;
two ends of the external feed tube are closed;
a convergent channel is coaxially connected to the downstream part of the internal feed tube;
a necking tube is coaxially connected with the convergent channel, wherein the cross sectional area of the necking tube is less than that of the internal feed tube;
a divergent channel is coaxially connected to the downstream part of the necking tube;
a reaction tube is coaxially connected with the divergent channel, wherein the cross sectional area of the reaction tube is greater than that of the necking tube;
and a plurality of holes are made in the wall of the downstream part of the internal feed tube or in the wall of the convergent channel.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/311,263Filed 21 Aug 2007
Priority: CN 200610152393.328 Sep 2006
Published: 3 Jun 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

B01J 19/26
Chemical, physical or physico-chemical processes in general; Their relevant apparatus: nozzle-type reactors, i.e. the distribution of the initial…
B01F 25/3141
Wherein additional components are introduced at the circumference of the conduit: with additional mixing means other than injector mixers
B01F 25/31423
The conduit having a plurality of openings in the axial direction or in the circumferential direction: with a plurality of perforations in the…
B01F 25/433
Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction: mixing tubes wherein the shape of the tube influences…