Formaldehyde exhaust-gas efficient film absorption technique

Abstract

The invention relates to a formaldehyde waste gas high efficient membrane absorption technique, pertaining to the technical field of physical absorption or chemical absorption treatment and membrane separation. The ratio of diameter to height of a hollow fiber membrane contactor adopted by the technique is 0.1 to 0.3, the loading density is 0.1 to 0.6, the aperture of a membrane micropore is 0.1 to 0.3 Mum and the porosity is 0.1 to 0.6; formaldehyde in the waste gas is absorbed by adopting absorption liquid water or ammonia spirit with the content of 1 percent to 5 percent to generate the hydrates of the formaldehyde, namely, methylene glycol or hexamethylenetetramine, thus realizing the recycling treatment of the formaldehyde waste gas. The technique combines the traditional physical or chemical absorption treatment method and the high efficient membrane separation technique, can be operated under moderate conditions, namely, at normal temperature and normal pressure, has short treatment period and high treatment efficiency and can completely remove the formaldehyde in the waste gas. The technique can remove not only high-concentration formaldehyde but also low-concentration formaldehyde in the waste gas, with high efficiency, and the absorption liquid obtained during the treatment of the high-concentration formaldehyde waste gas can be further utilized, thereby realizing the recycling treatment of the formaldehyde waste gas.

Description

technical field [0001] The invention discloses a high-efficiency membrane absorption technology for formaldehyde waste gas, which belongs to the technical field of physical absorption or chemical absorption treatment and membrane separation. Background technique [0002] Formaldehyde (HCHO), also known as formaldehyde, is a colorless, volatile gas with a special pungent odor at room temperature, with a boiling point of -21°C. Formaldehyde is a toxic air pollutant that has a wide range of sources and poses a serious threat to human health. It is irritating to human eyes, nose, and respiratory tract; it can cause abnormal liver function, lung function, and immune function; high-concentration formaldehyde is also a genotoxic substance that can cause nasopharyngeal tumors. In 1995, formaldehyde was identified as a suspected carcinogen by the International Agency for Cancer (IARC). [0003] At present, the technologies for controlling formaldehyde pollution at home and abroad m...

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Problems solved by technology

These methods have disadvantages such as long processing cycle, low efficiency or high cost.

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