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Method for improving ethylene yield in ethanol dehydration to ethylene process

A technology for ethanol dehydration and ethylene, applied in the field of improving ethylene yield, can solve the problems of large ethylene loss and low recovery efficiency, and achieve the effect of easy operation

Active Publication Date: 2015-11-18
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the existing literature or reports, the problem of how to increase the yield of ethylene in the process of ethylene dehydration to ethylene is seldom involved, especially the problem of ethylene rectification column bottom liquid treatment or large loss of ethylene
The patent (ZL200710040705.64) proposes the method of adiabatic flash evaporation to recover ethylene in the still liquid of the ethylene rectification tower. Although part of the ethylene can be recovered, the recovery efficiency is not high

Method used

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  • Method for improving ethylene yield in ethanol dehydration to ethylene process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] according to figure 1 The schematic diagram of the process is separated from the ethylene vittal distillation tower from the ethylene drying system. The ethylene containing a light component is divided into the top of the tower. The diversion of the components of the coarse ethylene is: 0.070 kg / h, the methane 0.070 kg / h, the carbon monoxide 0.557 kg / h, the ethylene 1274.518 kg / h, the ethane 7.060 kg / h, the propine 1.555 kg / h, the acetaldehyde 0.113 kg / hour / hour / hour Hours, ether 5.631 kg / hour, heavy component 33.957 kg / hour. The diversion of the reorganization of the ethylene distillation tower kettle is: 18.585 kg / h, ethylene 20.751 kg / h, propane 2.070 kg / h, acetaldehyde 0.119 kg / h, ether 5.778 kg / h, reorganization score of 36.523 kg / Hour. The top temperature of the ethylene rectification tower is -25.1°C, the pressure is 2.15MPaG, the bottom temperature is 9.3°C, the theoretical plate number of the whole tower is 80, and the feeding position is in the middle and l...

Embodiment 2

[0017] In the same embodiment 1, only the theoretical level and feed version of the ethylene sperm distillation tower are changed: the number of theoretical tower plates of the tower is 92, the feed position is in the middle and lower part, and other embodiment 1. The reorganization of the ethylene distillation tower kettle is 83.801 kg / h, of which the ethylene is 18.579 kg / h, and the pump was sent to the top of the steam distilled tower for steaming. ..1°C, pressure 2.15MPaG, tower bottom temperature 9.3°C, stripping distillation tower top temperature 9.5°C, pressure 2.16MPaG, tower bottom temperature 59°C. After stripping and distillation, the material mainly containing ethylene from the top of the tower is circulated into the lower part of the ethylene rectification tower, and the discharge from the bottom of the tower mainly contains ethane and C 3 + The mixture is 50.0 kg / hour, of which 1.690 kg / h. The thermal overload of the steam distillation tower is 4.711kW. Ethyle...

Embodiment 3

[0019] In the same Example 1, only the theoretical level of the tower of the steam -lifted distilled tower: the number of theoretical tower plates of the tower is 20, and other embodiment 1. The reorganization of the ethylene distillation tower kettle is 82.584 kg / h, of which the ethylene is 18.309 kg / h, and the pump was sent to the top of the steam distilled tower for steaming. ..1 ° C, the pressure is 2.15MPAG, the temperature of the tower is 9.7 ° C, the tower top temperature of the steam -lifted distilled tower is 9.8 ° C, the pressure is 2.16MPAG, and the tower kettle temperature is 59 ° C. After distillation of viadr, the material containing ethylene containing ethylene -containing materials is looped into the lower part of the ethylene distillation tower. 3 + The mixture is 50.0 kg / hour, of which 1.676 kg / h. The thermal overload of the steam distillation tower is 4.585kW. Ethylene revenue was 99.03%(weight).

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Abstract

The invention relates to a method for increasing the ethylene yield in a process of preparing ethylene through ethanol dehydration, and mainly solves a problem, which is not involved in documents in the past, of increasing the ethylene yield in the process of preparing ethylene through ethanol dehydration, especially a problem of ethylene rectification tower bottoms treatment or great ethylene loss. According to the technical scheme of the method, the tower bottom of an ethylene rectification tower is fed to the top of a heavy-component stripping distillation tower, the tower top vapour phase of the heavy-component stripping distillation tower is fed back to the middle and lower part of the ethylene rectification tower, and the heavy components are discharged from the bottom of the heavy-component stripping distillation tower. By the technical scheme, the problem is solved well and the method can be used in industrial production of the ethylene through ethanol dehydration.

Description

technical field [0001] The present invention involves a method of increasing ethylene revenue in a ethanol dehydration. Background technique [0002] Ethylene is an important basic raw material for organic chemical engineering, which is mainly used to produce a variety of organic chemical products such as polyethylene, polyvinyl chloride, ethylene methane / ethylene, ethylene / styrene, and acetate. At present, the production method of ethylene at home and abroad is mainly produced by oil raw materials catalysis. In recent years, the study of ethylene production of non -oil raw materials has made new breakthroughs, especially ethanol dehydration production of ethylene technology. This technology is a raw material that originated from agricultural and sideline products, which can avoid dependence on petroleum resources. For countries and regions, which are poor and agricultural, the raw materials for the production of ethanol are prone to and are guaranteed. It has laid suffici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C7/04
Inventor 邵百祥朱瑛
Owner CHINA PETROLEUM & CHEM CORP
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