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Rectification method and apparatus for propylene and propane separation

A technology for propylene and propane, applied in the field of separation of propylene and propane, can solve the problems of low relative volatility and large energy consumption for separation, and achieve the effects of improving flux, improving separation efficiency, and optimizing radial distribution.

Inactive Publication Date: 2014-08-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relatively small volatility between the two components, the separation energy consumption is large

Method used

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  • Rectification method and apparatus for propylene and propane separation
  • Rectification method and apparatus for propylene and propane separation
  • Rectification method and apparatus for propylene and propane separation

Examples

Experimental program
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Effect test

example 1

[0023] The liquefied hydrocarbon A enters the propane and propylene separation and rectification tower (1), and the gas phase stream at the top of the tower passes through the top stream compressor (3) to increase the pressure and temperature, and then enters the condensation reboiler heat exchanger (4) at the bottom of the tower to connect with the bottom of the tower. The liquid phase stream is subjected to heat exchange, and a part of it is refluxed into the top of the propane-propylene separation tower (1) through the pump (5), and a part is output as the product propylene B. After heat exchange, the liquid phase stream at the bottom of the tower is partially vaporized by heating, and enters the separation tank (6) of the stream stream in the bottom of the tower, and the gas phase fluid in the tank enters the bottom of the propane propylene separation and rectification tower (1) again, and the liquid phase is used as the product propane C. out. The rectification section an...

example 2

[0026] The propylene contained in the raw material liquefied hydrocarbon is 65% (mol), the height of the propane and propylene separation and rectification tower is 50m, the operating pressure is 1.8Mpa, and the operating temperature is 40°C. For the new type of staggered structured packing (4), every adjacent 10 pieces of packing is a group of packing units, and the difference between each group of packing units is the same height, which is 50% of the height of the packing unit. The propylene concentration at the top of the column is 99.7% (mol), and the propylene concentration at the bottom of the column is 2.6% (mol). Energy consumption is reduced by 30%.

example 3

[0028] The propylene contained in the raw material liquefied hydrocarbon is 70% (mol), the height of the propane and propylene separation and rectification tower is 100m, the operating pressure is 2.2Mpa, and the operating temperature is 50°C. For the new type of staggered structured packing (4), every adjacent 30 pieces of packing is a group of packing units, and the difference between each group of packing units is the same height, which is 75% of the height of the packing unit. The propylene concentration at the top of the column was 99.8% (mol), and the propylene concentration at the bottom of the column was 1.6% (mol). Energy consumption is reduced by 30%.

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Abstract

The invention relates to a rectification method for propylene and propane separation. The apparatus comprises a multiple heat pump rectification system including a whole tower heat pump distillation system, a rectification system of a rectifying section and a heat pump rectification system of a stripping section, also comprises a tower top stream reflux pump, a stream reflux pump of the rectifying section and a stream reflux pump of the stripping section. Liquefied hydrocarbon enters into a propane and propylene rectification tower from a liquid hydrocarbon concentrate pump through a liquefied hydrocarbon tank; propylene is discharged from the tower top, and propane is discharged from the tower bottom; the propylene concentration at the tower top is 99-99.9%, and the propylene concentration at the bottom of the tower is 1.5-3%; a novel staggered structured packing of window diversion structured packing in highly alternate arranged optimizes radial distribution of the gas and liquid in the rectification tower, buffers the gas phase flow among the filler plates, and plays the role of collecting liquid flow, so as to improve the separation efficiency of propylene and propane. The multiple heat pump rectification system optimizes energy coupling among gas streams in the tower, and reduces energy consumption; and compared with the traditional method, the apparatus reduces the energy consumption by 30% and the total investment for the process.

Description

technical field [0001] The invention relates to a method for separating propylene and propane, and mainly relates to a rectification method and a device for separating propane and propylene. Background technique [0002] The purification of olefins can be regarded as the largest energy consumer in distillation in the petrochemical industry, and the annual energy demand in the United States is about 26-52X10 12 kJ, where propane-propylene separation is particularly prominent. Due to the relatively small volatility between these two components, when the conventional swallow distillation method is used, the designed tower can be as high as 90 meters, the number of trays can be more than 200, the reflux ratio is greater than 10, and pressurization and refrigeration are required. So it consumes more energy. The rapid development of propylene-based petrochemical products has greatly promoted the substantial growth of propylene consumption, and my country's propylene production i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C9/08C07C7/04B01D3/14
Inventor 刘春江高飞丁晖殿宋宁袁希钢
Owner TIANJIN UNIV
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