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Reactor used for preparing gas-phase hydrogen cyanide

A reactor, hydrogen cyanide technology, applied in the preparation/purification/separation of hydrogen cyanide, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of not mentioning the details of the reaction process, and achieve the service life Long time, high reaction conversion rate, good distribution effect

Active Publication Date: 2014-12-10
CHINA TIANCHEN ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Nippon Chemical Industry Co., Ltd. announced in 1998 (CN1202458A): use methanol ammonia as a raw material to react the method for producing prussic acid in the presence of oxygen; details not mentioned

Method used

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  • Reactor used for preparing gas-phase hydrogen cyanide
  • Reactor used for preparing gas-phase hydrogen cyanide
  • Reactor used for preparing gas-phase hydrogen cyanide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0050] The reactor shell side 2 has a diameter of 2.5 meters, and contains 2781 reaction tubes 6 with an outer diameter of 35 mm, a wall thickness of 2 mm, and a tube spacing of 44 mm. Each reaction tube 6 is 3 meters long, and 6 casing-type temperature For the temperature measurement point of the detection device 8, three thermocouples are arranged in each group of detection devices. Set a raw material gas distribution device 9 with an opening of 120° at a distance from the upper head of the reactor, and open 4 small holes of 3 mm. The projected area of ​​the concentric circle of the raw material gas distribution device 9 on the outer wall of the reactor shell side 2 is about 0.4D The catalyst is placed in the reaction column tube 6, and the air feed rate can be kept at 18000-20000Nm 3 / h, methanol, ammonia and air enter the reactor when the preheating temperature is above 200°C.

[0051] The diversion device adopts the following settings. The upper diversion device 5-1 is p...

Embodiment 3

[0054] The reactor shell side 2 has a diameter of 2.5 meters, and contains 2751 reaction tubes 6 with an outer diameter of 35 mm, a wall thickness of 2 mm, and a tube spacing of 44 mm. The length of each reaction tube 6 is 3 meters, and 6 casing-type temperature For the temperature measurement point of the detection device 8, three thermocouples are arranged in each group of detection devices. Set a raw material gas distribution device 9 with an opening of 120° at a distance from the upper head of the reactor, and open 4 small holes of 3 mm. The projected area of ​​the concentric circle of the raw material gas distribution device 9 on the outer wall of the reactor shell side 2 is about 0.4D A catalyst is placed in the reaction tube 6, and the air feed rate can be kept at 500-1000 Nm3 / h. Methanol, ammonia and air enter the reactor when the preheating temperature is above 200°C.

[0055] The diversion device adopts the following settings. The upper diversion device 5-1 is provid...

Embodiment 4

[0058] The reactor shell 2 has a diameter of 0.5 meters, and contains 82 reaction tubes 6 with an outer diameter of 38 mm, a wall thickness of 3 mm, and a tube spacing of 48 mm. The length of each reaction tube 6 is 1.3 meters, and two casing-type temperature For the temperature measurement points of the detection device 8, 4 thermocouples are arranged in each group of detection devices. A raw material gas distribution device 9 with an opening of 100° is set at a distance from the upper head of the reactor, and four small holes of 3mm are opened on the top. The projected area of ​​the concentric circle of the raw material gas distribution device 9 on the outer wall of the reactor shell side 2 is about 0.3D Catalysts are placed in the reaction tube 6, and the intake of raw materials can be kept at 180-200Nm 3 / h.

[0059] A mixture containing potassium nitrate and sodium nitrite is used as the heat transfer medium in the flow guiding device. On this basis, the central positio...

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Abstract

The invention discloses a reactor used for preparing gas-phase hydrogen cyanide. The reactor used for preparing gas-phase hydrogen cyanide comprises an upper sealing head, a lower sealing head, a shell side and reaction tubes, wherein the reaction tubes are arranged in the shell side; the upper sealing head and the lower sealing head are respectively and correspondingly mounted at the upper end and the lower end of the shell side; the reactor used for preparing gas-phase hydrogen cyanide also comprises a feed gas distribution device, a temperature monitoring device, a heat-transfer medium flow guide device and a hollow flow guide cylinder; the feed gas distribution device is mounted in the top end of a main body structure of the tubular reactor; the temperature monitoring device is inserted from the top end of the main body structure of the tubular reactor; the heat-transfer medium flow guide device is mounted on the outer part of the shell side; flow guide holes are formed in an inner wall surface, being in contact with the heat-transfer medium flow guide device, of the shell side; the hollow flow guide cylinder and the reaction tubes are mounted in the shell side in a mixing manner. The reactor used for preparing gas-phase hydrogen cyanide has the beneficial effects of being capable of generating easily-separated hydrogen cyanide gas and stably and effectively dissipating reaction heat, an accurate reaction temperature monitoring system is arranged, the feed gas distribution effect is good, the reaction conversion rate is high; a catalyst is low in loss during use and long in service life.

Description

technical field [0001] The invention belongs to the technical field of chemical production process equipment, and in particular relates to a reactor that can be used to prepare gas-phase hydrogen cyanide. Background technique [0002] The traditional process uses the methanol ammoxidation method to produce hydrogen cyanide. The production principle is that the mixed raw material gas composed of methanol, ammonia and air in a certain proportion is catalytically reacted at a certain temperature and pressure in a fixed-bed reactor equipped with a catalyst. A mixed gas composed of hydrogen cyanide, carbon monoxide, carbon dioxide, water vapor and unreacted methanol, ammonia, oxygen, nitrogen, etc. is obtained. [0003] The reaction is: CH 3 OH+NH 3 +O 2 →HCN+3H 2 o [0004] BASF announced in 2009 (CN101511734A): Formamide production process has the problems of high reaction temperature and low conversion rate. Aiming at the problem of easy formation of carbon black in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/06C01C3/02
Inventor 闫哲张红柳王聪赵敏伟李荣杨克俭梁军湘赵斌屈阁闫伟兰杰赵艳艳郑仁姚立东
Owner CHINA TIANCHEN ENG
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