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Energy-saving production method of ethanol dehydration to ethylene

A technology for ethanol dehydration and production method, which is applied in the directions of sustainable manufacturing/processing, hydrocarbon production from oxygen-containing organic compounds, chemical industry, etc., and can solve the problems of insufficient treatment of organic waste water, insufficient heat energy recovery, complicated process, etc., To achieve the effect of reducing energy consumption of the device, short process and simple process

Active Publication Date: 2016-08-17
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in the prior art, the recovery of heat energy from ethanol dehydration to ethylene is insufficient and the generated organic wastewater has not been fully treated to achieve the purpose of resource utilization, or even after treatment, there are complex processes, long process, To solve the problem of large investment, provide a new energy-saving production method for ethanol dehydration to ethylene

Method used

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  • Energy-saving production method of ethanol dehydration to ethylene

Examples

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Effect test

Embodiment 1

[0030] according to figure 1 In the technical scheme shown, the raw material vapor phase ethanol is at a reaction temperature of 345°C, a reaction pressure of 0.06MPaG, and a liquid phase ethanol space velocity of 0.9hr -1 Under the condition of γ-Al 2o 3 Catalyst contact dehydration reaction produces ethylene. After the reaction gas recovers heat through the waste heat boiler, the temperature drops to 160°C and enters the quench tower. It is washed with washing water under the conditions of top pressure 0.04MPaG and top temperature 40°C. The liquid phase organic wastewater after washing Enter the stripping and rectifying tower for separation, and the by-organic waste water containing organic matter is separated at the top of the tower, and the organic matter-poor waste water containing trace organic matter is separated at the bottom of the tower. The flow rate of each component of organic wastewater is: carbon dioxide 0.016 kg / h, ethylene 0.799 kg / h, ethane 0.002 kg / h, prop...

Embodiment 2

[0033] Same as the embodiment [Example 1], only the theoretical number of stages of the stripping and rectifying tower is changed: the number of theoretical plates in the whole tower is 22, and the feeding position is in the middle and upper part. The organic matter-poor waste water in the bottom of the stripping and rectifying tower is 9200 kg / hour, wherein the organic matter is 3ppm. The vapor phase at the top of the stripping and rectifying tower enters the condenser, the flow rate is 40.577 kg / h, the reflux of the stripping and rectifying tower is 11.890 kg / h, and the stripping and rectifying tower produces 27.744 kg / h of rich organic waste water with an ethanol concentration of 79.6% wt, 0.942 kg / h of the gaseous phase at the top of the stripping and rectifying tower. The top temperature of the stripping and rectifying tower is 90.8° C., the pressure is 0.11 MPaG, and the bottom temperature is 125° C.

[0034] The temperature of the reaction gas is reduced to 160°C by th...

Embodiment 3

[0037] Same as [Example 1], only change the heating method of the tower still of the stripping distillation tower, replace the reboiler with steam directly entering the bottom of the tower, there is no condenser at the top of the tower, and the vapor phase is extracted and returned to the ethanol dehydration ethylene plant. The feeding position of the organic waste water stream 6 is at the first tray at the top of the stripping and rectifying tower. The organic matter-poor waste water in the bottom of the stripping and rectifying tower was 10538.662 kg / hour, of which the organic matter was 12.7ppm. The flow rate of the vapor phase (organic waste water) at the top of the stripping distillation tower is 240.024 kg / hour, and the concentration of ethanol is 9.23%wt. The top temperature of the stripping and rectifying tower is 120.5° C., the pressure is 0.11 MPaG, and the bottom temperature is 123.3° C.

[0038] The temperature of the reaction gas is reduced to 160°C by the waste ...

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Abstract

The invention relates to an energy-efficient method for ethylene production from ethanol dehydration, and mainly solves the problems in the prior art that recovery of heat energy is incomplete, utilization of produced organic wastewater is incomplete, or that the organic wastewater is treated, but the process is complex, long in flow and large in investment. The method comprises the following steps: a) contacting ethanol with a catalyst to generate a material flow 2 containing ethylene; b) recovering heat in the material flow 2 by a heat recovery device to obtain a material flow 3; and generating a steam material flow 8 by the heat recovered by the heat recovery device; c) introducing the material flow 3 into the a quench tower to conduct counter current contact with washing water entering from the top, so as to obtain a coarse ethylene material flow 5 in the top and an organic wastewater material flow 6 at the bottom; d) introducing the material flow 6 into the upper middle part of a stripping rectification tower to obtain a material flow 9 at the tower top and a material flow 7 containing water at the tower bottom; and e) using part or all of the material flow 8 to heat tower bottom of the stripping rectification tower bottom. The technical scheme well solves the above problems and can be used in industrial production for preparing ethylene by ethanol dehydration.

Description

technical field [0001] The invention relates to an energy-saving production method for producing ethylene by dehydrating ethanol. Background technique [0002] Ethylene is an important bulk organic chemical raw material, mainly used to produce polyethylene, polyvinyl chloride, ethylene oxide / ethylene glycol, ethylbenzene / styrene, vinyl acetate and other organic chemical products. At present, ethylene production methods at home and abroad are mainly produced by catalytic cracking of petroleum raw materials. In recent years, new breakthroughs have been made in the research on the production of ethylene from non-petroleum raw materials, especially the technology of ethanol dehydration to produce ethylene. The technology uses ethanol derived from biomass as raw material, which avoids dependence on petroleum resources. For countries and regions that are poor in oil and dominated by agriculture, the raw materials for ethanol production are easy to obtain and guaranteed, laying a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C1/24
CPCY02P20/10Y02P20/50
Inventor 邵百祥
Owner CHINA PETROLEUM & CHEM CORP
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