Process for recovering ethylene in process of ethylene preparation by ethanol dehydration

A technology for ethanol dehydration and ethylene, applied in organic chemistry, distillation purification/separation, etc., can solve the problem of large ethylene loss, achieve the effect of reducing the amount of ethylene and increasing the flash energy

Active Publication Date: 2008-11-19
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the problem of ethylene rectification tower still liquid treatment or ethylene loss that is not involved in the existing literature, and to provide a new method for recovering ethylene in the process of ethanol dehydration to ethylene

Method used

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  • Process for recovering ethylene in process of ethylene preparation by ethanol dehydration

Examples

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Embodiment 1

[0014] Crude ethylene from the ethylene drying system enters the ethylene rectification tower for separation. The ethylene containing light components is separated at the top of the tower, and the heavy components are separated at the bottom of the tower. The flow rates of each component are: ethylene 27.1 kg / h, ethane 745.5 kg / hour, acetaldehyde 9.2 kg / hour, ether 126.1 kg / hour, heavy component 185.8 kg / hour, wherein ethylene accounts for 2.48% (weight). After the mixture is heated to a certain temperature by the heater, it enters the middle of the flash tank for adiabatic flash evaporation. The temperature of the flash tank is 30°C and the pressure is 2.7MPaG. The material circulation enters the lower part of the ethylene rectification tower, and the flow rate of each component is: 26.8 kg / hour of ethylene, 314.5 kg / hour of ethane, 1.2 kg / hour of acetaldehyde, 18.1 grams / hour of ether, and 43.6 kg / hour of heavy components, of which Ethylene accounts for 6.64% by weight. The...

Embodiment 2

[0016] According to the feed composition and operating steps of Example 1, change the adiabatic flash evaporation conditions, the operating temperature is -10 ° C, and the ratio of the flow of the heavy component circulating to the middle of the flash tank to the flow of the heavy component discharged is 80:1 (by weight) , then the ethylene concentration of ethylene in the heavy component output is 6.06% (weight).

Embodiment 3

[0018] According to the feed composition and operating steps of Example 1, the adiabatic flash conditions were changed, the operating temperature was 40° C., the pressure was 2.2 MPaG, and the ratio of the flow of heavy components circulating to the middle of the flash tank to the flow of the heavy components was 120: 1 (weight), then the ethylene concentration of ethylene in the heavy component discharge is 1.72% (weight).

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Abstract

The invention relates to a method for reclaiming ethylene in the process for making ethylene through ethanol dehydration, mainly solving the problems not mentioned in the prior literature including ethylene rectification tower bottoms treatment or greater ethylene loss. The method solves the problems better through adopting the following technical proposal that: ethylene rectification tower bottoms are fed in an adiabatic flash drum; the adiabatic temperature of the flash drum is between 15 DEG C below zero and 80 DEG C and the pressure inside the flash drum is between 1.0 and 4.0 MPaG; finally, after adiabatic flash evaporation, the materials at the top of the flash drum is returned to the middle part of an ethylene rectification tower, and the heavy component at the bottom of the flash drum is discharged. The method can be used in the industrial production of ethylene through adopting ethanol dehydration.

Description

technical field [0001] The invention relates to a method for recovering ethylene in the process of ethanol dehydration to ethylene. Background technique [0002] Ethylene is a very important petrochemical raw material, and its bulk downstream products mainly include polyethylene, ethylene oxide, ethylene glycol, polyvinyl chloride, styrene, vinyl acetate, etc. [0003] The production process of ethanol dehydration to ethylene and the catalysts used are well known. The current main research goal is to improve the process flow, reduce the unit consumption of ethanol and increase the efficiency of the device. [0004] Among the process methods of ethanol dehydration to ethylene, there are many methods in the published literature or patents at home and abroad, and the basic processes are mainly divided into fixed bed process and fluidized bed process. ABB Lummus company once proposed to carry out ethanol dehydration reaction to produce ethylene (USP4134926) with fluidized bed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C7/04
Inventor 沈伟胡力智邵百祥刘军
Owner CHINA PETROLEUM & CHEM CORP
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