Method for using energy of acetic acid device

A technology of acetic acid and energy, which is applied in the separation/purification of carboxylic acid compounds, the preparation of carboxylic acid by carbon monoxide reaction, organic chemistry, etc. It can solve the problems of unreasonable energy utilization and unrecovered reaction heat, so as to improve the economic benefit of the device, The effect of saving operating costs

Active Publication Date: 2014-06-18
SINOPEC SHANGHAI ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that there are problems in the prior art that the reaction heat is not recycled and the energy utilization is unreasonable, and a new energy utilization method for acetic acid plant is provided

Method used

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  • Method for using energy of acetic acid device

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Experimental program
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Effect test

Embodiment 1

[0025] use figure 1 As shown in the flow process, carbon monoxide 12 and the first methanol 13 enter the reactor 1, and after the reaction, the top obtains a gaseous phase flow 15, and the bottom obtains a first liquid flow 16 and a second liquid flow 17; the first liquid flow 16 Return to the reactor after being cooled by the first heat exchanger 8; the gas phase stream 15 enters the first liquid separation tank 3 after being cooled by the second heat exchanger 9, and after liquid separation, a liquid phase stream 18 and a first tail gas stream 19 are obtained The liquid phase stream 18 returns to the reactor 1; the second liquid phase stream 17 enters the flash tower 2, and the flash tower top obtains the gas phase stream 20, and the bottom obtains the liquid phase stream 29; the liquid phase stream 29 returns to the reactor; The gas phase stream 20 at the top of the steaming tower 2 enters the light component tower 6, and the gas phase stream 21 is obtained at the top of th...

Embodiment 2

[0029]Same as [Example 1], taking an acetic acid plant with an annual output of 300,000 tons as an example, the feed rate of methanol is 20,000 kg / hr, the feed rate of carbon monoxide is 18,600 kg / hr, the reaction temperature is 190° C., and the operating pressure is 3.0 MPa. The oxo synthesis reactor It is necessary to remove the reaction heat of 7.1MW / hr, use the boiler and water to recover heat, generate low-pressure steam, and remove the reaction heat. The generated low-pressure steam leads to the refrigeration system to prepare chilled water. The efficiency of the low-pressure steam refrigeration system is 60-70%, and at least 4260KW / hr of cooling capacity can be recovered, as shown below:

[0030] The cooling capacity required by the second heat exchanger 9 is 283KW / hr, the cooling capacity required by the third heat exchanger 10 is 1454KW / hr, and the cooling capacity required by the third heat exchanger 11 is 180KW / hr, totaling 1917KW / hr The cooling capacity, other cool...

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Abstract

The invention relates to a method for using energy of an acetic acid device. Through the method, the problems that reaction heat is not recycled and the energy is unreasonably used in the prior art can be mainly solved. According to the technical scheme well solving the problems, the reaction heat is recycled through external recycle stocks of a reactor; the recycled reaction heat generates low-pressure saturated steam; the generated low-pressure saturated steam leads to a refrigeration unit to prepare refrigerated water; the prepared and refrigerated water serves as cooling mediums of a top heat exchanger of a carbonyl synthesis unit reactor, a top heat exchanger of a light component tower of a refined separation unit and an absorbent heat exchanger of a tail gas recovery tower of a tail gas recovery unit. The method for using energy of the acetic acid device can be applicable to industrial production of acetic acid synthesis through methyl alcohol carbonylation.

Description

technical field [0001] The invention relates to a method for energy utilization of an acetic acid plant. Background technique [0002] Acetic acid is one of the important organic acids, mainly used in the synthesis of vinyl acetate, cellulose acetate, acetate, metal acetate, etc., and can also be used as a solvent in other organic synthesis processes, such as PTA production, etc. It is also used in pharmaceuticals, fuels, pesticides, etc. , photosensitive materials and other important raw materials for organic synthesis. [0003] In the 1970s, Monsanto successfully developed the methanol low-pressure carbonylation process, which has now become the main production method of acetic acid in the world. Among them, methanol low-pressure liquid-phase carbonyl check reaction is the core process in the production process of acetic acid. During the reaction process, the raw materials methanol, carbon monoxide, flash column bottom reflux and recycle stream are continuously added to t...

Claims

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Application Information

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IPC IPC(8): C07C51/10C07C51/42C07C53/08
CPCC07C51/12C07C51/42C07C53/08
Inventor 许慎艳张艺贾微贾震张翼徐曼
Owner SINOPEC SHANGHAI ENG
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