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Technological process for preparing acetic acid from calcium carbide furnace tail gas

A technology of calcium carbide furnace tail gas and process method, which is applied in the chemical industry, can solve the problems of polluting the environment and wasting CO resources, and achieves the effects of reducing pollution, improving dust removal effect and high efficiency

Inactive Publication Date: 2009-06-24
高恒 +1
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Problems solved by technology

At present, the known calcium carbide flue gas is usually treated by dust removal first, and then directly discharged or used as fuel for power generation, which pollutes the environment and wastes valuable CO resources.

Method used

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  • Technological process for preparing acetic acid from calcium carbide furnace tail gas

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Embodiment Construction

[0015] like figure 1 Shown in, the process method of the present invention utilizing calcium carbide furnace tail gas to prepare acetic acid, it sends the high-purity CO obtained after the calcium carbide furnace tail gas is cooled, dedusted, purified and adsorbed into the acetic acid synthesis device, and reacts with methanol to generate acetic acid ; Concrete process steps are as follows:

[0016] (1) Calcium carbide furnace tail gas cooling: Send the calcium carbide furnace tail gas into the by-product steam waste heat boiler to cool down to 210-230°C, and then cool it to 160-180°C with boiler circulating water;

[0017] (2) Dust removal of calcium carbide furnace tail gas: the cooled calcium carbide furnace tail gas enters the bag filter for dust removal. The bag filter has high purification efficiency, large processing capacity, stable performance, long service life, no moving parts inside, and stable resistance , The characteristics of high gas velocity, the MC96II puls...

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Abstract

The invention discloses a technique for preparing acetic acid by utilizing tail gas of a calcium carbide furnace, comprising the steps: first, temperature reduction and cooling are carried out on the tail gas of the calcium carbide furnace, then, dust abatement and cooling are carried out on the tail gas of the coolled calcium carbide furnace; after the processes of temperature reduction and dust abatement, the tail gas of the calcium carbide furnace enters an electric detarring precipitator for detarring; after being pressurized, the tail gas is transmitted into a purification apparatus for desulfurization, deoxidation and dehydration; CO2 and other impurities in the purified tail gas of the calcium carbide furnace are removed by a pressure-swing absorption apparatus (SPA), and high purity gas of CO with the purity of 97-99% is obtained; after pressure swing adsorption, the CO is pressurized and sent into a acetic acid synthesizer, and then reacts with methyl alcohol to produce the acetic acid. The technique not only realizes recycling of the tail gas of the calcium carbide furnace and reduces the environmental pollution, but also can produce acetic acid products with high added value, thus improving the economic benefit of the product.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a process for preparing acetic acid by using tail gas of a calcium carbide furnace. Background technique [0002] The calcium carbide furnace will produce a large amount of tail gas during the production process. For example, the tail gas of a closed calcium carbide furnace contains more than 85% carbon monoxide, a large amount of dust and a small amount of nitrogen, hydrogen, etc. At present, the known calcium carbide flue gas is usually treated by dust removal first, and then directly discharged or used as fuel for power generation, which pollutes the environment and wastes valuable CO resources. Contents of the invention [0003] In order to solve the above problems, the purpose of this invention is to provide a kind of processing method utilizing calcium carbide furnace tail gas to prepare acetic acid, which can not only fully recycle the CO in the cal...

Claims

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Application Information

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IPC IPC(8): C07C53/08C07C51/12C01B31/18C01B32/40
Inventor 高恒张爱民刘宏建王兰甫伏盛世王磊田亚鹏金富强
Owner 高恒
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