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System and process for recycling second-acid tower kettle liquid waste heat

A diacid tower, waste heat recovery technology, applied in the separation/purification of carboxylic acid compounds, the preparation of carboxylate salts, the preparation of organic compounds, etc. , the problem of low purity of formic acid in the tri-acid tower, etc., to achieve the effect of universality, low cost, and easy large-scale production

Active Publication Date: 2019-12-31
聊城鲁西甲酸化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the production process of formic acid, the di-acid tower is a pressurized tower, and the temperature of the tower kettle is between 150°C and 154°C. It needs to be cooled and then enters the middle of the three-acid tower. tower, while the kettle liquid cooler directly uses circulating water for cooling. Due to the high temperature of the kettle liquid, frequent fouling occurs on the circulating water side of the shell side of the kettle liquid cooler, and the heat exchange efficiency decreases. The heat exchanger needs to be washed frequently; the circulating water uses The large amount increases the power consumption of the circulating water pump, resulting in energy waste; the medium temperature is high, and the circulating water heat exchanger is easy to scale
[0005] On the other hand, the triacid tower formic acid (85%) that existing technical process produces also has low purity, the problem of poor product quality

Method used

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  • System and process for recycling second-acid tower kettle liquid waste heat

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Experimental program
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Effect test

Embodiment 1

[0043] Such as figure 1 As shown, a process for recovery and utilization of waste heat from the bottom liquid of the two-acid tower, including the bottom liquid (154°C) of the two-acid tower 1 enters the reboiler B3 of the three-acid tower through the transfer line 2, and the bottom liquid of the three-acid tower is treated Raise the temperature, then the liquid in the bottom of the second tower (98° C.) returns to the transfer line 2, and then enters the middle part of the three-acid tower 4. Utilize the residual heat of the diacid tower bottom liquid.

[0044] The results of one-year production operation show that the average purity of triacid tower formic acid is 87%.

Embodiment 2

[0046] A system for recovering waste heat from the bottom liquid of a diacid tower, comprising: a diacid tower 1, a three acid tower 4, a reboiler B3, the liquid outlet of the bottom of the diacid tower 1 and the reboiler of the three acid tower The shell-side liquid inlet of B3 is connected, and the liquid discharge port of the three-acid tower reboiler B3 is connected with the liquid inlet in the middle of the three-acid tower 4 .

[0047] Aiming at the problem that the current diacid tower 1 uses a large amount of circulating water and is easy to scale. In the present invention, the liquid in the 1st tower of the di-acid tower is connected to the lower side of the shell side of the reboiler B3 of the three-acid tower through the pipeline 2, and it is used as a heat source to heat up the 4th tower of the three-acid tower, so that the heat of the liquid in the 1st tower of the di-acid tower Effective conduction to the three-acid tower 4 not only reduces the consumption of cir...

Embodiment 3

[0050] A system for recovering waste heat from the bottom liquid of a diacid tower, comprising: a diacid tower 1, a three acid tower 4, a reboiler B3, the liquid outlet of the bottom of the diacid tower 1 and the reboiler of the three acid tower The shell-side liquid inlet of B3 is connected, and the liquid discharge port of the three-acid tower reboiler B3 is connected with the liquid inlet in the middle of the three-acid tower 4 .

[0051] Described diacid tower 1 is also provided with a plurality of heat exchangers, the tower bottom liquid of diacid tower is heated (reboiler) or cooling (still liquid cooler), as figure 1 The heat exchangers on the left and right sides of the intermediate diacid tower 1 meet the different requirements for the use of the still liquid.

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Abstract

The invention relates to a system and a process for recycling second-acid tower kettle liquid waste heat. The system comprises a second-acid tower, a third-acid tower and a reboiler B, wherein the liquid discharge port of the tower kettle of the second-acid tower is connected to the shell pass liquid inlet of the third-acid tower reboiler B, and the liquid discharge port of the third-acid tower reboiler B is connected to the liquid inlet in the middle of the third-acid tower. According to the invention, by arranging the third-acid tower reboiler B, the second-acid tower kettle liquid waste heat is effectively recovered, and the water consumption and the power consumption are reduced, so that the energy consumption is reduced; and the heat required for heating the third-acid tower kettle utilizes the second-acid tower kettle liquid waste heat, so that the use amount of heating steam of the third-acid tower is reduced so as to reduce the energy consumption.

Description

technical field [0001] The invention belongs to a waste heat recovery and utilization process, in particular to a system and process for the waste heat recovery and utilization of a diacid tower kettle of a formic acid plant. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Patent CN102952007A discloses a single set of production equipment with an annual output of 100,000 tons of formic acid, which mainly includes a carbonyl reactor, a methyl ester rectification tower, a methyl ester storage tank, a first hydrolysis reactor, a second hydrolysis reactor, and an acid tower , two-acid tower, and three-acid tower, wherein the bottom outlet of the carbonyl reactor is connected ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/44C07C53/02
CPCC07C51/445C07C53/02Y02P20/10
Inventor 郑辉李怀增吴明军姜圣旭郭广勇冯长新刘云涛
Owner 聊城鲁西甲酸化工有限公司
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