Method and device for removing acid in tail gas from reaction for producing 2-butyl acetate

A technology of sec-butyl acetate and tail gas, which is applied in the direction of separation method, carboxylate preparation, chemical instrument and method, etc., can solve the problems of high operating cost, small amount of acid gas, affecting economic benefits, etc., and achieves easy processing The effect of manufacturing, reducing production costs, and reasonable technical solutions

Active Publication Date: 2009-04-08
中石化湖南石油化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology uses water to treat tail gas containing acetic acid. Although it can remove the acid in the tail gas containing acid, the technology has the following problems: ① It uses a large amount of water to absorb acid, and a large amount of acid-containing sewage is produced in the process. Discharge treatment not only wastes money, affects economic benefits, but also pollutes the environment and affects social benefits
② The tower treatment process with built-in packing is used, the process and control system are relatively complicated, and the operating cost is high
③ The parts in contact with the acetic acid medium, such as the tower body and the packing inside the tower, need to use expensive corrosion-resistant stainless steel materials; when considering the start-up and

Method used

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  • Method and device for removing acid in tail gas from reaction for producing 2-butyl acetate
  • Method and device for removing acid in tail gas from reaction for producing 2-butyl acetate
  • Method and device for removing acid in tail gas from reaction for producing 2-butyl acetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take the tail gas treatment of a 30,000-ton / year sec-butyl acetate production line as an example. According to the above process flow and steps, a 10% circulating absorption sodium hydroxide solution is prepared. During the operation, the tail gas containing 99% concentration acetic acid is discharged at a rate of 5.9 t / h, the temperature control system of the deacidification tower is started, and two alkali The liquid circulation pump was started to run, and the accident treatment was completed after 10 minutes. The concentration of lye in sampling and analysis was 5.6%. The acetic acid content in the tail gas after deacidification could not be detected, and the quality of the tail gas met the requirements.

Embodiment 2

[0032] Take the tail gas treatment of a 30,000-ton / year sec-butyl acetate production line as an example. According to the above-mentioned technological process and steps, a 10% circulating absorption sodium hydroxide solution was prepared. During the operation, the tail gas containing 82ppm concentration acetic acid was discharged in an amount of 3.9t / h, and the small alkali liquor circulating pump of the deacidification tower was operated. After 10 minutes After the accident was dealt with, the concentration of lye in sampling and analysis was almost unchanged, the acetic acid content in the exhaust gas after deacidification could not be detected, and the quality of the exhaust gas met the requirements.

Embodiment 3

[0034] Take the tail gas treatment of a 30,000-ton / year sec-butyl acetate production line as an example. According to the above-mentioned technological process and steps, a 10% circulating absorption sodium hydroxide solution was prepared, and the tail gas containing 52ppm concentration acetic acid was discharged in an amount of 8.5t / h during the operation, and the small alkali liquor circulating pump of the deacidification tower was operated. After 15 minutes After the accident was dealt with, the concentration of lye in sampling and analysis was almost unchanged, the acetic acid content in the exhaust gas after deacidification could not be detected, and the quality of the exhaust gas met the requirements.

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Abstract

The invention relates to a method and a device for effectively removing acid in tail gas during the process of preparation of alcohol sec-butyl acetate by utilization of liquefied petroleum gas to be mixed with n-butene in c_4 olefin and react with an acetic acid. The method takes an alkali solution as a solvent to remove the acetic acid in released tail gas in an extracting tower during the process of production of the alcohol sec-butyl acetate by adoption of the n-butene in the liquefied petroleum gas as a raw material; the liquefied petroleum gas after removal of the acetic acid is sent into a gas-liquid settling tank again, and enters into a torch pipe network system after separation of an alkali solution; and a tail gas system of the whole device is isolated from an external device through a liquid seal which is arranged on the gas-liquid settling tank. The method and the device guarantee that the tail gas after deacidification can safely enter into a gas holder and a torch system which do not resist acetic acid corrosion, save the trouble of needing to match a newly-built torch system which resists acetic acid corrosion and the gross investment of the newly-built device.

Description

technical field [0001] The invention relates to a method and a device for effectively removing acid in tail gas in the process of preparing sec-butyl acetate by reacting n-butene in liquefied petroleum gas mixed with carbon tetraolefin and acetic acid. Background technique [0002] Acetic acid is one of the important organic chemical raw materials. It is the raw material for the synthesis of various lower fatty acid esters, acetate fibers and plastics. It is a colorless and transparent liquid with a pungent sour odor, which can strongly stimulate the human nose, throat and respiratory system and pollute the environment; and its flammable, flash point is 43 ℃, its vapor and air can form an explosive gas mixture, In case of open fire and high temperature, it can cause combustion and explosion; it is also a highly corrosive organic acid, which has a strong corrosive effect on ordinary steel and even corrosion-resistant stainless steel. [0003] In the process of petroleum refi...

Claims

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Application Information

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IPC IPC(8): B01D53/72B01D53/78C07C67/08C07C69/14
Inventor 彭鸽威袁红星潘罗其
Owner 中石化湖南石油化工有限公司
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