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Production method for preparing ethylene through ethanol dehydration

A technology of ethanol dehydration and production method, which is applied in the direction of hydrocarbon production from oxygen-containing organic compounds, organic chemistry, distillation purification/separation, etc., can solve the problems of insufficient treatment of organic waste water, complicated process, large investment, etc., and achieves the treatment cost. The effect of reducing, simple process and low investment

Active Publication Date: 2015-06-10
CHINA PETROLEUM & CHEM CORP +1
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  • 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 organic wastewater produced by ethanol dehydration to ethylene has not been fully treated to achieve the purpose of resource utilization, or even after treatment, there are problems such as complicated process, long process, and large investment. , to provide a new treatment method for organic wastewater from ethanol dehydration to ethylene, which has the characteristics of simple process, short process, less investment and resource utilization of organic wastewater

Method used

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  • Production method for preparing ethylene through ethanol dehydration

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Experimental program
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Effect test

Embodiment 1

[0022] 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 -1Under the conditions of γ-Al2O3 contact dehydration reaction to produce ethylene, the reaction gas is washed with washing water in the quench tower with a top pressure of 0.04MPaG and a top temperature of 40°C, and the washed liquid-phase organic wastewater enters the stripping and rectifying tower for Separation, at the top of the tower, the by-organic wastewater containing organic matter is separated, and at the bottom of the tower, the organic-poor wastewater containing trace organic matter is separated. 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, propane 0.001 kg / h, acetaldehyde 0.977 kg / h, ethanol 22.229 kg / h, ether 0.398 kg / h hour, heavy component 0.07 kg / hour, water 9204....

Embodiment 2

[0025] Same as embodiment 1, only change the theoretical stages of the stripping rectifying tower: the number of theoretical plates in the whole tower is 22, the feeding position is in the middle and upper part, other is the same as embodiment 1. The organic matter-poor waste water in the bottom of the stripping and rectifying tower is 9200 kg / hour, wherein the organic matter is zero. 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 organic-rich wastewater produced by the stripping and rectifying tower is 27.744 kg / h, 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.

[0026] The heat load of the stripping distillation column rebo...

Embodiment 3

[0028] Same as Example 1, only change the heating mode of the tower kettle 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 recovered and returned to the ethanol dehydration ethylene production device, and the others are the same as in the embodiment 1. 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 vapor phase (organic-rich wastewater) flow rate at the top of the stripping distillation tower is 240.024 kg / h, and the ethanol concentration 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.

[0029] The flow rate of the stripping steam in the stripping distillation column is 1550 kg / hour.

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Abstract

The invention relates to a production method for preparing ethylene through ethanol dehydration and mainly aims to solve the problems such as complex process, long process, high investment and the like existing in a treatment method for organic wastewater generated in preparing ethylene through ethylene dehydration in the prior document. The problems are better solved through the technical scheme that the production method comprises the following steps: (a) enabling vapor-phase ethanol and a catalyst to be in contact for dehydration reaction to generate ethylene-containing reaction gas; (b) enabling the reaction gas to enter a quenching tower to be in countercurrent contact with washing water for cooling and washing to obtain crude vapor-phase ethylene on the top and organic liquid-phase wastewater at the bottom, wherein the washing water is introduced from the top of the quenching tower; (c) enabling the organic wastewater to enter a stripping and rectifying tower for stripping and rectifying to obtain an organic matter-containing vapor-phase material flow on the top of the tower and a water-containing material flow at the tower kettle; (d) condensing the vapor-phase material flow through a condenser, then, enabling the vapor-phase material flow to enter a vapor-liquid separation tank, and separating the vapor-phase material flow and a liquid-phase material flow, wherein a part of the liquid-phase material flow reflows to the stripping and rectifying tower, and the other part of the liquid-phase material flow is extracted. The production method can be used for the industrial production of ethylene prepared through ethanol dehydration.

Description

technical field [0001] The invention relates to a 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 sufficient raw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C1/24C07C7/04
Inventor 邵百祥何志
Owner CHINA PETROLEUM & CHEM CORP
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