Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Production process and device for preparing ethylene through dehydration of ethanol

An ethanol dehydration and production process technology, applied in ethylene production, products, hydrocarbon production from oxygen-containing organic compounds, etc., can solve the problem of unreasonable energy utilization in low-temperature refining process, lack of global understanding of ethanol-to-ethylene process, and process waste emissions. It can improve the level of green production, inhibit catalyst carbon deposition, and reduce steam consumption.

Active Publication Date: 2021-06-29
TIANJIN UNIV
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The main inventions and optimizations are all based on the local design on the original basis, lack of overall understanding of the ethanol to ethylene process, and have not fundamentally solved the existing problems of the existing original process, such as small reaction unit scale, poor selectivity, and catalyst accumulation. Serious carbon, unreasonable energy utilization in the low-temperature refining process, high energy consumption in operation, high process waste emissions, and high failure rate of production process equipment have not been resolved.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Production process and device for preparing ethylene through dehydration of ethanol
  • Production process and device for preparing ethylene through dehydration of ethanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Raw material ethanol feed rate is 4200kg / hr, enters ethanol evaporation tank 102 after being preheated by ethanol preheater 101, evaporates after being heated by ethanol evaporator 108 and ethanol evaporator 109, ethanol vapor from ethanol evaporation tank 102 passes through The ethanol superheater 103 is heated by the reaction gas to raise the temperature to 300°C. The overheated ethanol is divided into three streams and enters the heating furnace 104 to be heated and sent to the reactor; part of the overheated ethanol vapor is mixed with the water vapor recovered from the quenching compression system and then enter The first stage of the heating furnace 104 is heated and sent to the first reactor 105. The inlet temperature of the first reactor 105 is 420°C, the outlet temperature is 300°C, and the operating pressure is 0.75Mpa.

[0051] The reaction gas from the first reactor 105 is mixed with part of the ethanol vapor from the ethanol superheater 103, enters the secon...

Embodiment 2

[0061] Raw material ethanol feed rate is 4500kg / hr, enters ethanol evaporation tank 102 after being preheated by ethanol preheater 101, evaporates after being heated by ethanol evaporator 108 and ethanol evaporator 109, ethanol vapor from ethanol evaporation tank 102 passes through The ethanol superheater 103 is heated by the reaction gas to raise the temperature to 300°C. The overheated ethanol is divided into three streams and enters the heating furnace 104 to be heated and sent to the reactor; part of the overheated ethanol vapor is mixed with the water vapor recovered from the quenching compression system and then enter The first section of the heating furnace 104 is heated and sent to the first reactor 105. The inlet temperature of the first reactor 105 is 480°C, the outlet temperature is 370°C, and the operating pressure is 1.0Mpa.

[0062] The reaction gas from the first reactor 105 is mixed with part of the ethanol vapor from the ethanol superheater 103, enters the seco...

Embodiment 3

[0072] Raw material ethanol feed rate is 5120kg / hr, enters ethanol evaporation tank 102 after being preheated by ethanol preheater 101, evaporates after being heated by ethanol evaporator 108 and ethanol evaporator 109, ethanol vapor from ethanol evaporation tank 102 passes through The ethanol superheater 103 is heated by the reaction gas to raise the temperature to 300°C. The overheated ethanol is divided into three streams and enters the heating furnace 104 to be heated and sent to the reactor; part of the overheated ethanol vapor is mixed with the water vapor recovered from the quenching compression system and then enter The first section of the heating furnace 104 is heated and sent to the first reactor 105. The inlet temperature of the first reactor 105 is 520°C, the outlet temperature is 430°C, and the operating pressure is 1.25Mpa.

[0073] The reaction gas from the first reactor 105 is mixed with part of the ethanol vapor from the ethanol superheater 103, enters the sec...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
Login to View More

Abstract

The invention provides a production process and device for preparing ethylene through dehydration of ethanol. According to the invention, an ethanol dehydration reaction system, a quenching compression system, an alkaline tower system, a molecular sieve regeneration system, an ethylene purification system, a propylene refrigeration circulation system and the device are arranged. The production process comprises the following steps: feeding ethanol to the ethanol dehydration system, and carrying out a dehydration reaction to obtain reaction gas; cooling and separating the reaction gas in the quenching compression system, and returning the recovered ethanol to the ethanol dehydration reaction system; feeding crude ethylene, carbon dioxide, water and the like to the alkali washing and molecular sieve system, and removing carbon dioxide and water to obtain crude ethylene; feeding the crude ethylene to the ethylene purification system to obtain an ethylene product; and providing cooling quantity for the ethylene purification system via the propylene refrigeration circulation system. According to the process, gradient utilization of heat of high-temperature reaction product gas is designed; a propylene circulation compression refrigeration system is adopted to provide a low-temperature refrigerant, so energy consumption in the process is effectively reduced; and external water replenishing is canceled while sewage discharge of the system is reduced, so water resource consumption is reduced.

Description

technical field [0001] The invention relates to a process for producing ethylene, in particular to a process and device for preparing ethylene by dehydration of ethanol. Background technique [0002] The chemical formula of ethylene is C 2 h 4 , is the simplest alkene. Ethylene is a colorless gas with a sweet smell at room temperature, and its density is 0.5678g / cm at -104°C 3 , Insoluble in water, slightly soluble in acetone and benzene, soluble in ethanol and ether. Ethylene is flammable and explosive, and can form explosive mixtures with air, with an explosion limit of 2.7% to 36% (V). Ethylene is active in nature and prone to reactions such as polymerization, oxidation, alkylation, halogenation and carbonylation. [0003] Ethylene can be used to prepare a variety of organic raw materials. At present, about 75% of petrochemical products are produced from ethylene, including acetaldehyde, acetic acid, ethylene oxide, ethylene glycol, ethylbenzene, chloroethanol, vinyl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/24C07C7/148C07C7/13C07C7/00C07C11/04
CPCC07C1/24C07C7/1485C07C7/13C07C7/00C07C11/04Y02P20/141Y02P30/40
Inventor 张敏华余英哲龚浩董贺孟芳刘成董秀芹
Owner TIANJIN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products