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Multi-component rectifying tower and waste heat recycling method for same

A rectifying tower, multi-component technology, applied in fractionation, distillation purification/separation, organic chemistry, etc., can solve the problems of small temperature difference, difficult recovery and large flow rate of waste heat recovery and utilization, so as to reduce the cooling load at the top of the tower and reduce equipment investment. and operating costs

Active Publication Date: 2015-10-07
CHINA PETROCHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the molecular sieve dewaxing process, the overhead distillate of the extraction liquid separation tower is n-pentane and isooctane, and the distillation temperature of the overhead distillate is about 100°C, the temperature level is low, and the temperature difference of waste heat recovery and utilization is small. It is not easy to recover; but the flow rate of the overhead distillate is large, and it is distilled in the gas phase, so there is a large amount of latent heat that cannot be effectively utilized

Method used

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  • Multi-component rectifying tower and waste heat recycling method for same
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for recovering waste heat from a multi-element rectification tower, comprising the steps of:

[0037] (1) The mixture of n-alkanes, isooctane and n-pentane is passed into the extract liquid separation tower, and after separation by the extract liquid separation tower, n-alkanes are obtained at the bottom of the tower, and the overhead distillate is isooctane and n-pentane A mixture of pentane (the temperature at the top of the tower is 107°C), and the overhead distillate is heat-exchanged to 90°C with a heat exchanger;

[0038] (2) The overhead distillate after heat exchange enters the reflux tank for gas phase and liquid phase separation;

[0039] (3) Part of the liquid obtained from gas phase and liquid phase separation in step (2) (accounting for 91% of the total mass of liquid obtained from gas phase and liquid phase separation) is refluxed to the top of the extraction liquid separation tower, and the other part is sent to the desorbent in the buffer tank;...

Embodiment 2

[0042] A method for recovering waste heat from a multi-element rectification tower, comprising the steps of:

[0043] (1) The mixture of n-alkanes, isooctane and n-pentane is passed into the extract liquid separation tower, and after separation by the extract liquid separation tower, n-alkanes are obtained at the bottom of the tower, and the overhead distillate is isooctane and n-pentane A mixture of pentane (the temperature at the top of the tower is 105°C), and the overhead distillate is heat-exchanged to 85°C with a heat exchanger;

[0044] (2) The overhead distillate after heat exchange enters the reflux tank for gas phase and liquid phase separation;

[0045] (3) Part of the liquid obtained from gas phase and liquid phase separation in step (2) (accounting for 76% of the total mass of liquid obtained from gas phase and liquid phase separation) is refluxed to the top of the extraction liquid separation tower, and the other part is sent to the desorbent in the buffer tank;...

Embodiment 3

[0048] A method for recovering waste heat from a multi-element rectification tower, comprising the steps of:

[0049] (1) The mixture of n-alkanes, isooctane and n-pentane is passed into the extract liquid separation tower, and after separation by the extract liquid separation tower, n-alkanes are obtained at the bottom of the tower, and the overhead distillate is isooctane and n-pentane A mixture of pentane (the temperature at the top of the tower is 103°C), and the overhead distillate is heat-exchanged to 80°C with a heat exchanger;

[0050] (2) The overhead distillate after heat exchange enters the reflux tank for gas phase and liquid phase separation;

[0051](3) Part of the liquid obtained from gas phase and liquid phase separation in step (2) (accounting for 66% of the total mass of liquid obtained from gas phase and liquid phase separation) is refluxed to the top of the extraction liquid separation tower, and the other part is sent to the desorbent in the buffer tank; ...

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PUM

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Abstract

The invention relates to a multi-component rectifying tower, which comprises an extracted solution separating tower, a heat exchanger, a reflux tank, a cooler, a product tank and a desorption agent buffer tank, wherein a top outlet of the extracted solution separating tower is communicated with an inlet of the heat exchanger; an outlet of the heat exchanger is communicated with an inlet of the reflux tank; a liquid outlet of the reflux tank is communicated with a top inlet of the extracted solution separating tower and an inlet of the desorption agent buffer tank respectively; a gas outlet of the reflux tank is communicated with an inlet of the cooler; an outlet of the cooler is communicated with an inlet of the product tank; an outlet of the product tank is communicated with the inlet of the desorption agent buffer tank. The invention also relates to a method for recycling waste heat by using the multi-component rectifying tower. Compared with the prior art, the multi-component rectifying tower has the advantages that 1, the distillation temperature of a tower roof is increased, and bubble point reflux is achieved; 2, the waste heat of the tower roof is utilized, or the utilization quantity is increased; 3, the cooling load of the tower roof is reduced, and the equipment investment and the operation cost are reduced.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for recovering and utilizing waste heat by using a multi-element rectification tower and the equipment it adopts. Recovery of pentane. Background technique [0002] During the molecular sieve dewaxing process, the overhead distillate of the extraction liquid separation tower is n-pentane and isooctane, and the distillation temperature of the overhead distillate is about 100°C, the temperature level is low, and the temperature difference of waste heat recovery and utilization is small. It is not easy to recover; however, the overhead distillate has a large flow rate and is distilled in the gas phase, so there is a large amount of latent heat that cannot be effectively utilized. Contents of the invention [0003] The present invention overcomes the deficiencies in the prior art and is to provide a multi-component rectification tower and a method for recovering residua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14C07C7/04C07C9/15C07C9/14
Inventor 周立群潘鹏蔡吉乡
Owner CHINA PETROCHEMICAL CORP