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Method and device for recycling latent heat of acetic acid removal tower of isopropyl acetate device based on heat pump system

A technology of isopropyl acetate and heat pump system, which is applied in the separation/purification of carboxylate, preparation of carboxylate, chemical instruments and methods, etc. It can solve the problems of no research on waste heat recovery, reduce system energy consumption and cost, etc. , to achieve the effect of easy operation, low energy consumption and simple process

Pending Publication Date: 2022-05-24
HUNAN ZHONGCHUANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the prior art, the waste heat recovery and utilization of the one-step synthesis of isopropyl acetate system by olefin addition method has not been studied yet, and it is urgent to reduce the energy consumption and cost of the system

Method used

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  • Method and device for recycling latent heat of acetic acid removal tower of isopropyl acetate device based on heat pump system
  • Method and device for recycling latent heat of acetic acid removal tower of isopropyl acetate device based on heat pump system

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The mixed material after the reaction of acetic acid and propylene is sent to the deacetic acid tower for refining. The temperature at the top of the deacetic acid tower is 88 °C. The condensate and the heat extractor are absorbed into the condensate at 78°C, and the condensate outlet of the heat extractor enters the tower top condenser through the pipeline for further cooling, and then is sent to the top reflux tank and the top reflux tank. Part of the material is refluxed, and part of it enters the refining tower for further refining; the bottom temperature of the refining tower is 91 ° C, the bottom material is extracted through the side line at the bottom of the tower and enters the heater of the heat pump system through the heat pump circulating pump, and the outlet of the heat pump circulating pump The pressure is 0.3MPa, the material heated by the heater of the heat pump system is 101°C, and then returned to the bottom of the refining tower after being decompresse...

Embodiment 2

[0050] The mixture material after the reaction of acetic acid and propylene is sent to the deacetic acid tower for refining. The temperature at the top of the deacetic acid tower is 90 °C. The condensate and the heat extractor are absorbed into the condensate at 80 °C, and the condensate outlet of the heat extractor enters the tower top condenser through the pipeline for further cooling and then is sent to the tower top reflux tank. Part of the material is refluxed, and part of it enters the refining tower for further refining; the bottom temperature of the refining tower is 92 ° C, the bottom material is extracted through the side line at the bottom of the tower and enters the heater of the heat pump system through the heat pump circulating pump, and the outlet of the heat pump circulating pump The pressure is 0.28MPa, the material heated by the heater of the heat pump system is 102°C, and then returned to the bottom of the refining tower after being decompressed by the thrott...

Embodiment 3

[0053] The mixed material after the reaction of acetic acid and propylene is sent to the deacetic acid tower for purification. The temperature at the top of the deacetic acid tower is 92 °C. The condensate and the heat extractor are absorbed into the condensate at 82°C, and the condensate outlet of the heat extractor enters the tower top condenser through the pipeline for further cooling, and then is sent to the top reflux tank and the top reflux tank. Part of the material is refluxed, and part of it enters the refining tower for further refining; the bottom temperature of the refining tower is 95 ° C, the bottom material is extracted through the side line at the bottom of the tower and enters the heater of the heat pump system through the heat pump circulating pump, and the outlet of the heat pump circulating pump The pressure is 0.32MPa, the material heated by the heater of the heat pump system is 105°C, and then it returns to the bottom of the refining tower after being deco...

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Abstract

A method for recycling latent heat of an acetic acid removal tower of an isopropyl acetate device based on a heat pump system comprises the following steps: (1) feeding a tower top vapor-phase material of the acetic acid removal tower into the heat pump system for heat exchange, and changing the tower top vapor-phase material subjected to heat exchange into condensate to enter a tower top reflux tank; (2) materials at the bottom of the refining tower enter a heater of a heat pump system through a heat pump circulating pump to be heated, and then return to the bottom of the refining tower after being decompressed by a throttle valve; and (3) the circulating water enters a condenser of the heat pump system, absorbs part of heat and then is fed into a cooling tower for cooling, and the cooled circulating water passes through a pressure pump and then returns to the heat pump system for recycling. According to the method provided by the invention, the problem of latent heat recovery in the isopropyl acetate preparation process in the prior art is successfully solved by utilizing the heat pump system, the energy recovery rate can reach 45% or above, about 9600 tons of steam can be saved per year by using the heat pump system for the isopropyl acetate device of 50,000 tons per year, the energy consumption of the production device is greatly reduced, the process is simple, and the method is suitable for industrial production. The operation is easy.

Description

technical field [0001] The invention relates to the technical field of chemical reaction engineering, in particular to a method and device for recycling the latent heat of an isopropyl acetate device deacetic acid tower based on a heat pump system. Background technique [0002] Isopropyl Acetate (IPA for short), also known as isopropyl acetate, is a colorless and transparent liquid with a pleasant fruit aroma. It is slightly soluble in water, and can be miscible with most solvents such as alcohol, ketone, ether, etc. It is called "universal solvent". It has excellent solubility for various synthetic resins and natural resins. It is a kind of excellent performance that can completely replace toluene. It is an environmentally friendly organic solvent and chemical raw material of butanone, used as a solvent for coatings, printing inks, etc., and is also commonly used in industry as a dehydrating agent, an extractant and a fragrance component in pharmaceutical production, and is...

Claims

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Application Information

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IPC IPC(8): F25B15/06F28C1/00C07C67/48C07C67/54C07C69/14C01D15/04
CPCF25B15/06F28C1/00C07C67/48C07C67/54C01D15/04F28C2001/006C07C69/14Y02P20/129
Inventor 李霁叶伟宁王伟华刘良会刘郁东
Owner HUNAN ZHONGCHUANG CHEM