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Ethanol dehydration fluidized bed process and reaction

A fluidized bed reactor and ethanol dehydration technology, which is applied in chemical instruments and methods, bulk chemical production, chemical/physical processes, etc., can solve the problems of high energy consumption, severe corrosion, heat transfer effect and poor catalyst stability of ethanol dehydration process and other problems, to achieve the effect of saving the amount of lye, solving the corrosion problem, and reducing the amount of entrainment

Inactive Publication Date: 2008-10-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of high energy consumption, low ethanol conversion rate, low ethylene yield, poor catalyst stability and rapid deactivation of the existing ethanol dehydration process, serious corrosion and poor heat transfer effect of the molten salt heating equipment, and alkali washing in the subsequent treatment. To avoid shortcomings such as tower plugging, provide a process for dehydrating ethanol to produce ethylene using a highly efficient fluidized bed reactor

Method used

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  • Ethanol dehydration fluidized bed process and reaction
  • Ethanol dehydration fluidized bed process and reaction
  • Ethanol dehydration fluidized bed process and reaction

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Embodiment 1

[0037] The lower end of the housing 11 of the fluidized bed reactor is sealed with the upper end of the lower cone 6, and a feed gas inlet 5 for the fluidized bed reactor is provided in the middle of the lower cone 6, corresponding to the housing 11 and the lower cone 6. A catalyst discharge port 7 is provided at the sealed position, and a gas distribution plate 8 is provided at the lower part of the casing 11 and the upper part of the catalyst discharge port 7 to collect the sinking catalyst. Two casing fixing pipes are provided in the housing 11, respectively the lower casing fixing pipe 9 and the upper casing fixing pipe 12, to fix the central conduit 23 and the lower end of the cyclone separator 17 built in the fluidized bed reactor. The finger sleeve bundle 10 is arranged between the cyclone separator 17 and the casing 11 . The heat transfer oil outlet and inlet of the finger-shaped bushing bundle 10 are respectively arranged on the upper part of the housing 11 . The low...

Embodiment 2

[0040] When ethanol dehydration is carried out in this process, the ZSM-5 molecular sieve catalyst modified by lanthanum with an average particle size of 300 μm is first loaded into the fluidized bed reactor through the catalyst feed port, and the heat transfer oil is used to preheat the fluidized bed and the catalyst. When reaching the reaction temperature of 250°C, the ethanol raw material with a concentration of 50wt% is preheated through the preheater, and the vaporized gas enters the inlet of the fluidized bed reactor through the heat exchanger, and the catalyst begins to fluidize under the action of the air flow, and after stabilization The pressure in the reactor is kept constant, the larger catalyst particles return to the fluidized bed cylinder through the expansion section, and the smaller catalyst particles return to the gas distribution plate through the cyclone separator through the central conduit. The gas after the reaction enters the water washing tower after he...

Embodiment 3

[0042] When ethanol dehydration is carried out in this process, the SAPO-31 molecular sieve catalyst modified by cerium with an average particle size of 300 μm is first loaded into the fluidized bed reactor through the catalyst feed port, and the heat transfer oil is used to preheat the fluidized bed and the catalyst. When reaching the reaction temperature of 260°C, the ethanol raw material with a concentration of 65wt% is preheated through the preheater, and the vaporized gas enters the inlet of the fluidized bed reactor through the heat exchanger, and the catalyst begins to fluidize under the action of the air flow, and after stabilization The pressure in the reactor is kept constant, the larger catalyst particles return to the fluidized bed cylinder through the expansion section, and the smaller catalyst particles return to the gas distribution plate through the cyclone separator through the central conduit. The reacted gas enters the water washing tower after being exchange...

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Abstract

The invention discloses an ethanol dehydration fluidized bed process, which takes an ethanol aqueous solution as a material and a molecular sieve as a catalyst, and prepares an ethylene through conducting the dehydration reaction in a fluidized bed reactor. The process comprises the detailed steps that: a molecular sieve catalyst is added to the fluidized bed reactor through a catalyst entrance and the reactor is preheated by heat conducting oil, the ethanol aqueous solution is vaporized, preheated and then supplied to the fluidized bed reactor when reaching the reaction temperature of between 180 and 300 DEG C, the catalyst flows under the action of the airflow of the ethanol water and has the dehydration reaction with the airflow, the reacted gas undergoes the water washing and alkaline washing after the heat exchange, thereby obtaining the ethylene gas. The invention also discloses a high efficient fluidized bed reactor. The process has advantages of improving the heat exchange efficiency, reducing the catalyst consumption and energy consumption, saving costs and improving the ethanol conversion per pass and ethylene yield.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a fluidized bed process for ethanol dehydration by using a molecular sieve catalyst and a fluidized bed reactor used in the process. Background technique [0002] Ethylene is the most important basic raw material in the petrochemical industry, and it is also the chemical with the largest output in the world. The development level of the ethylene industry represents the overall development level of a country's petrochemical industry. At present, the industrial production of ethylene at home and abroad adopts the route of petroleum raw materials, but petroleum resources are facing a serious shortage crisis. Therefore, in the case of increasing shortage of oil resources, it is necessary to seek a sustainable development path to solve the negative impact caused by the reduction of oil, which provides an unprecedented opportunity and challenge for the production ...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C1/24B01J8/18
CPCY02P20/52
Inventor 黄和苏国东李慧曾必文胡燚成源海胡耀池李恒索红波
Owner NANJING UNIV OF TECH
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