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Fluidised bed reactor for preparing ethylene by ethanol dehydration

A fluidized bed reactor, ethanol dehydration technology, applied in organic chemistry, bulk chemical production, hydrocarbon production from oxygen-containing organic compounds, etc., can solve the problems of high cost, complicated manufacturing, inconvenient loading and unloading of catalysts, etc.

Inactive Publication Date: 2010-09-08
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tube reactor is complicated to manufacture, the cost is high, and the catalyst is inconvenient to load and unload, so it tends to be gradually replaced by other types of reactors

Method used

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  • Fluidised bed reactor for preparing ethylene by ethanol dehydration
  • Fluidised bed reactor for preparing ethylene by ethanol dehydration
  • Fluidised bed reactor for preparing ethylene by ethanol dehydration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] According to the above technical scheme, a fluidized bed reactor for producing ethylene by dehydration of ethanol is manufactured. The height of the reactor is 150cm, the diameter of the outer wall 26 is 120cm; the diameter of the ring-shaped thermal insulation chamber sleeve 9 of the reactor is 90cm, and the height is 80cm; the diameter of the heating wire fixing sleeve 6 of the reactor is 80cm, and the height is 80cm; the columnar reaction chamber 5 has a diameter of 75 cm and a height of 83 cm, wherein the glass bead zeolite 15 packing layer height is 22 cm, the packing layer height of the catalyst 7 is 35 cm, and the thermocouple 2 extends into the catalyst 7 two-thirds. The temperature of the heating wire 8 in the annular heating chamber is controlled at 220°C, and the temperature of the electric heating plate 17 in the vaporization chamber is controlled at 80-95°C. The flow rate of ethanol delivered by the constant flow pump 21 is 750ml / min.

[0023] During prepa...

Embodiment 2

[0027] The structure of the reactor is the same as in Example 1.

[0028] During preparation, the liquid dehydrated alcohol that concentration is 20% (volume fraction) passes in the reactor with the speed of 880ml / min by constant-flow pump 21, and the catalyst 7 used is the H of ammonium metavanadate and phosphoric acid composite modification. - ZSM-5 (Si / Al=25), the temperature of the heating wire 8 in the annular heating chamber is controlled at 220°C, and the temperature of the electric heating disk 17 in the vaporization chamber is controlled at 90°C.

[0029] The gas after the reaction is measured by a gas chromatograph, the conversion rate of ethanol in the reactor reaches 99.7%, and the selectivity of ethylene reaches 98.0%.

Embodiment 3

[0031] The structure of the reactor is the same as in Example 1.

[0032] During preparation, the concentration is that 10% (volume fraction) liquid ethanol passes in the reactor with the speed of 670ml / min by constant flow pump 21, and the catalyst 7 used is the H-ZSM- 5 (Si / Al=25), the temperature of the heating wire 8 in the annular heating chamber is controlled at 220° C., and the temperature of the electric heating plate 17 in the vaporization chamber is controlled at 95° C.

[0033] The gas after the reaction is measured by a gas chromatograph, the conversion rate of ethanol in the reactor reaches 94.3%, and the selectivity of ethylene reaches 99.4%.

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Abstract

The present invention relates to a fluidized bed reaction device used for preparing ethylene by the dehydration of ethanol. The appearance of the reaction device is columned; the reaction device is divided into the upper part and the below part by an inner cross clapboard. The upper part is covered with a plurality of upright separated sleeves, which divide the reaction device into a column-shaped reaction room consisting of a catalyzer level, a beading zeolite level and a thermoelectric couple in turn, a ring shaped heating room consisting of a heating wire and a fixed sleeve, and a ring shaped heat insulation and heat preservation room consisting of a sleeve, which is made of asbestos and a fireproof insulating material. The below part is an ethanol aired room consisting of a heating wire plate and an ethanol feeding tube. The produced ethylene enters a collective device. The temperature for the ring shaped heating room is controlled in 220 DEG C. The temperature for the aired room is controlled in 80-95 DEG C. The pressure is increased when the ethanol passes through a flow-constant pump and the flow speed is 1500-2000ml / minquestion mark m2. The reaction device in the present invention integrates the aired device and the reacting device together, so the present invention simplifies the device structure and saves the energy. The conversion ratio for the ethanol inthe reaction device reaches up to 96 percent and the selectivity of the ethylene reaches up to 95.0 percent.

Description

technical field [0001] The invention relates to a fluidized bed reactor, in particular to a fluidized bed reactor used for ethanol dehydration to produce ethylene. Background technique [0002] At present, the ethanol dehydration industrial production equipment is mainly based on the fixed bed reactor technology. The largest ethanol dehydration industrial equipment in foreign countries was built before the 1980s in Brazil, India, Indonesia and other countries, all of which are 60kt / a equipment (using fixed bed reactor). There are two types of fixed bed reactors for ethanol dehydration: isothermal tubular and adiabatic. Most of the existing domestic ethanol dehydration devices use tube reactors (such as the 3kt / a device of Sichuan Vinylon Factory). The tube reactor is complicated to manufacture, the cost is high, and the catalyst is inconvenient to load and unload, so it tends to be gradually replaced by other types of reactors. At the end of the 1970s, Haakon Scientific D...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C1/24
CPCY02P20/52
Inventor 陈庆华洪爱珠黄宝铨颜贵炀肖荔人刘可慰
Owner FUJIAN NORMAL UNIV