Refining device for producing toluene diisocyanate and co-producing ortho toludiamine through phosgene method
A technology of toluene diisocyanate and o-toluene diamine, which is applied in the field of refining equipment for the production of toluene diisocyanate and co-production of o-toluene diamine by the phosgenation method, can solve the problems affecting the yield of phosgenation reaction and the loss of output, and reduce the Effects of operating cost, quality improvement, and consumption reduction
Inactive Publication Date: 2018-10-16
福建省东南电化股份有限公司
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Problems solved by technology
Because OTD will generate a cyclic urea in the phosgenation reaction, and further react with TDI to produce a polymerizable cyclic biuret, and the cyclic biuret and TDI will further polymerize to generate polymerized tar and consume more TDI, resulting in yield loss , thus affecting the yield of the phosgenation reaction
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[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0015] see figure 1 , the present invention provides a technical solution: a refining device for producing toluene diisocyanate and co-producing o-toluene diamine by phosgene method, comprising an OTD refining tower 1, an OTD refining tower, a raw material inlet, an OTD side line extraction outlet, and product cooling Valves are provided on the pipelines of the primary condenser, the reflux tank and the secondary condenser, and the inside of the OTD refining t...
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The invention discloses a refining device for producing toluene diisocyanate and co-producing ortho toludiamine (OTD) through a phosgene method. The refining device comprises an OTD refining tower, wherein a gas-phase opening of the OTD refining tower and a feeding opening of a first-grade condenser are mutually communicated; a liquid-phase outlet of the first-grade condenser and a feeding openingA of a refluxing tank are mutually communicated; a gas-phase outlet of the first-grade condenser and a feeding opening of a second-grade condenser are mutually communicated; a gas-phase outlet of thesecond-grade condenser is connected with an incineration system; crude OTD can be purified through the OTD refining tower, the first-grade condenser, the second-grade condenser and the refluxing tank, and the quality of an OTD product is improved; MTD (Meta-Toluenediamine) in tower kettle liquid in the OTD refining tower can be recycled through an ortho removing tower; the MTD is circularly recycled from the tower kettle liquid of the OTD refining tower, so that the operation elasticity of the ortho removing tower at the upstream can be improved; graded condensation can be realized through the first-grade condenser and the second-grade condenser and the dosage of refrigerating fluid can be reduced, so that the operation cost is reduced.
Description
technical field [0001] The invention relates to the technical field of chemical distillation, and specifically relates to a refining device for producing toluene diisocyanate and o-toluene diamine through a phosgene method. Background technique [0002] O-toluenediamine (OTD) is mainly used as intermediates in dyes, pesticides, medicines and organic synthesis, and can also be used as analytical reagents, vulcanization accelerators, saccharin, etc. [0003] OTD is a by-product of the process of producing toluene diisocyanate (TDI) by phosgene method. Since m-toluene diamine (MTD) is an important intermediate product in the production process of toluene diisocyanate (TDI), its purity has a great influence on TDI products. The production process is as follows: m-dinitrotoluene (DNT) is partially hydrogenated and reduced to m-toluene diamine (MTD) in the hydrogenation reaction, and some impurities in DNT will also be hydrogenated and reduced, including o-dinitrotoluene It is re...
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IPC IPC(8): C07C263/10C07C263/20C07C265/14C07C209/86C07C211/51
CPCC07C209/86C07C263/10C07C263/20C07C265/14C07C211/51
Inventor 张振兴张耕危振添林说安
Owner 福建省东南电化股份有限公司