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Device system and method for cooling CDON mixture prepared through dehydrogenation of CDOL

A reaction mixture, catalytic dehydrogenation technology, applied in the direction of dehydrogenation preparation, chemical instruments and methods, separation/purification of carbonyl compounds, etc., can solve the problems of increased floor area of ​​separation devices, obvious energy consumption, high total investment, etc. Achieve the effect of reducing investment in fixed assets, improving economy and avoiding losses

Active Publication Date: 2021-03-16
WANHUA CHEM GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process material at 75°C flows to the reaction liquid buffer tank by itself, and the material in the reaction liquid buffer tank is sent to the downstream rectification. The rectification temperature is generally 150-180°C. It also needs to consume additional steam to heat it, and the energy consumption is obvious.
However, due to the addition of the vapor-liquid contact tower, the total equipment investment is high, the separation device occupies an increased area, and the process is slightly complicated

Method used

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  • Device system and method for cooling CDON mixture prepared through dehydrogenation of CDOL
  • Device system and method for cooling CDON mixture prepared through dehydrogenation of CDOL
  • Device system and method for cooling CDON mixture prepared through dehydrogenation of CDOL

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Embodiment 1

[0051] according to image 3 In the process shown, the gas phase at the outlet of the dehydrogenation reactor enters the reaction gas phase condenser from bottom to top. The hydrogen and inert gases generated by the reaction enter the downstream process from the top of the gas phase condenser. After cooling, the liquid-phase process material is obtained, and the liquid-phase process material is refluxed by gravity in the heat exchange tube, and contacts and exchanges heat with the gas phase at the inlet in the heat exchange tube filled with stepped ring fillers to reduce energy consumption. The liquid phase flows to the buffer tank of the reaction solution. The process parameters of the above process are: annual output of CDON is 80,000 tons (annual operating time is 8000 hours), the outlet process control temperature of the dehydrogenation reactor is 250°C, the pressure is 100kPaA, the amount of inert carrier gas used in the dehydrogenation reactor is the same as that of CDO...

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Abstract

The invention discloses a device system and method for cooling and separating a CDON reaction mixture prepared through catalytic dehydrogenation of CDOL. According to the invention, hydrogen and CDONare generated through a catalytic dehydrogenation reaction of CDOL, and a gas product of the dehydrogenation reaction is condensed through a vertical tubular condenser so as to separate the product CDON and a byproduct, namely hydrogen. By means of a cooling and separating device and a specially-designed technological process, gas-liquid separation can be integrally achieved, energy consumption isreduced, operation cost is saved, and fixed investment is reduced to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of chemical separation, in particular to a device system and method for cooling and separating a CDON reaction mixture prepared by catalytic dehydrogenation of CDOL. Background technique [0002] CDOL (cyclododecanol, CAS No. 1724-39-6, molecular formula C 12 h 24 O) is an important intermediate in the nylon 12 (PA12) industry chain, and its main purpose is to prepare CDON (cyclododecanone, CAS number 830-13-7, molecular formula C 12 h 22 O). Patent CN105315146A describes a method for preparing cyclododecanone: oxidizing cyclododecene (CDEN) into epoxycyclododecane, rearranging epoxycyclododecane into cyclododecanone (CDON), and reacting The by-product cyclododecanol (CDOL) is generated during the process, and CDOL is dehydrogenated to obtain cyclododecanone (CDON). Patent CN 103055880A describes a catalyst and its preparation method for the dehydrogenation of cyclododecanol to prepare ketones. It discl...

Claims

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Application Information

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IPC IPC(8): C07C45/00C07C49/413C07C45/78
CPCC07C45/002C07C45/78C07C2601/20C07C49/413
Inventor 陈晨朱发明崔娇英
Owner WANHUA CHEM GRP
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