A kind of urea method ionic liquid catalysis prepares the method for toluene diisocyanate

A technology of toluene diisocyanate and ionic liquid, which is applied in the field of organic synthesis, can solve the problems of high cost, low yield, and environmental pollution, and achieve the effects of reducing production cost, good catalytic performance, and beneficial to industrial application
CN104276982BActive Publication Date: 2016-01-13陕西煤业化工技术开发中心有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
陕西煤业化工技术开发中心有限责任公司
Publication Date
2016-01-13

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Abstract

The invention provides application of an ionic liquid in preparing toluene diisocynate and a method for preparing the toluene diisocynate from urea under the catalysis of the ionic liquid. The method is used for preparing the toluene diisocynate by taking toluenediamine and urea as the raw materials, reacting the raw materials to generate toluene diurea under the catalytic action of the ionic liquid and then pyrolyzing the toluene diurea. The method does not need highly toxic phosgene and an extra solvent; the ionic liquid is adopted as a catalyst; on one hand, the ionic liquid is good in catalytic effect, easy to remove and environment-friendly, and on the other hand, a metal catalyst in the prior art is not used, so that the reaction of the method for preparing the toluene diisocynate from urea under the catalysis of the ionic liquid does not require harsh device materials and operating conditions, consequently, the production cost is greatly reduced, and the method is advantageous to industrial application.
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Description

technical field

[0001] The invention relates to a method for preparing toluene diisocyanate through a non-phosgene method catalyzed by an ionic liquid, belonging to the field of organic synthesis. technical background

[0002] Toluene diisocyanate (TDI) is an important raw material for the production of polyurethane. It is widely used in the synthesis of polyurethane foam, coatings, adhesives, pesticides and rubber. With the rapid development of the polyurethane industry, the demand for TDI is becoming more and more extensive. The traditional TDI synthesis method generally adopts the phosgene method (such as patent documents US3441586, CN103339105A, US8030522B2). The product hydrochloric acid corrodes equipment and other defects. Therefore, the development of a synthetic technology for the production of TDI by a non-phosgene method has positive practical significance and broad application prospects.

[0003] Patent document WP0156977 discloses a method for preparing TDI wi...

Claims

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