Apparatus for preparing high-boiling-point heat-sensitive substance, and its application method
An application method and heat-sensitive technology, applied in chemical instruments and methods, preparation of isocyanic acid derivatives, preparation of organic compounds, etc., can solve the problem of not being able to effectively reduce the boiling point of high-boiling heat-sensitive substances, the flow rate of the gas phase reaction mixture cannot be too high, Problems such as increased thermal decomposition of products, to achieve rapid and effective capture and absorption, reduce residence time, and increase yield
Active Publication Date: 2007-03-28
WANHUA CHEMICAL (NINGBO) CO LTD
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Problems solved by technology
The disadvantage of this method is that the flow rate of the gas phase reaction mixture cannot be too high, because the high flow rate of the gas phase reaction product flows into the solvent tank and cannot cool down quickly, which will cause the substance to decompose
[0004] US2004 / 0068137A1 uses an inert solvent at 100-170°C to spray the product in a fan shape in the kettle to quench the product and perform absorption treatment. However, this method is carried out under normal pressure and cannot effectively reduce the boiling point of high-boiling heat-sensitive substances. As a result, side reactions occur, especially It leads to the increase of thermal decomposition of the product in the reactor or the early condensation of the product, thus forming a solid residue and depositing on the wall of the reactor
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[0027] HMDA, phosgene, which has been heated to a temperature of 350 °C at a pressure of -350 mmbar in an upstream reactor, at 370 °C N 2 Diluent and gas-adjacent dichlorobenzene solvent pass through the nozzle extending into the gas-phase tubular reactor, continuously flow into the reactor, and react; the reactor is connected with the downstream diisocyanate absorption and condensation device and HCl, COCl 2 connected to the recycling unit.
[0028] Under negative pressure, the phosgenation product quickly flows into the mixing chamber of the jet vacuum pump, fully mixes with the high-speed solvent flow, and is cooled instantaneously; Cooling, the educt is further captured and absorbed, the diluent and unreacted phosgene entrained part of the solvent and products flow into the condenser under normal pressure, and the non-condensable gas further enters HCl, COCl 2 The recovery device absorbs treatment, thereby improving the post-treatment efficiency of photochemical liquid. ...
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The invention relates to a device for preparing high-boiling point thermosensitive matters and the application method thereof, belonging to the technical field of preparing devices of high-boiling point thermosensitive matters, characterized in comprising gas phase tube reactor making photo gasification reaction, negative pressure generating jet vacuum pump, storage tank, and condenser, where the gas phase tube reactor is connected with a mixing chamber in the jet vacuum pump, the mixing chamber is connected via Venturi pipe with the storage tank, the storage tank is connected with the condenser to HCl and COCl2 recovery units, the bottom of the storage tank is connected via rotating pump with a reacting solution processing system and a fresh solvent mixing condenser, and the fresh solvent mixing condenser is connected with a centralizing chamber in the jet vacuum pump. And it prolongs the service life of the reaction pipe; and makes the photo gasification product quickly and effectively collected and absorbed and instantly cooled.
Description
1. Technical field [0001] The invention relates to a device for preparing high-boiling point heat-sensitive substances and an application method thereof, and belongs to the technical field of preparation devices and application methods for high-boiling point heat-sensitive substances. 2. Background technology [0002] High-boiling heat-sensitive substances are easy to condense in the gas phase, and coke and hang on the wall to form deposits (eg, cracking products, polymerization by-products). An example is the gas-phase phosgenation of aromatic or aliphatic polyamino functional groups in a tubular reactor to prepare (poly)isocyanates. EP-A699657, EP-A676392, EP-A570799 describe the respective normal introduction of the reaction mixture in gas phase form into the reactor. [0003] In EP0289840’s description of the gas-phase phosgenation of diamines, in view of the thermal sensitivity of the product diisocyanate at a reaction temperature of 300-500°C in this system, the paten...
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Login to View More IPC IPC(8): C07C263/10B01J8/06B01J19/00
Inventor 马德强郝敬泉尚永华孙中平王勇李建峰
Owner WANHUA CHEMICAL (NINGBO) CO LTD