High-concentration formaldehyde exhaust-gas resource treatment technique
A technology for resource utilization and waste gas, applied in the fields of chemical absorption treatment and membrane separation, can solve the problems of ineffective utilization of waste gas, long treatment period and high cost, and achieve the effects of mild operating conditions, short treatment period and high treatment efficiency.
Inactive Publication Date: 2009-02-11
WUXI ZHONGXING IND ADHESIVE TAPE
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Problems solved by technology
These methods not only have the disadvantages of long treatment period, low efficiency or high cost, but also most of the treatment methods are destructive and cannot effectively utilize waste gas, a precious resource.
Recycling treatment technology for formaldehyde waste gas, especially high-concentration formaldehyde waste gas, has not yet been reported.
Method used
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Embodiment 1
[0025] according to figure 2 The treatment device in this paper uses a polypropylene membrane contactor with a diameter-to-height ratio of 0.15, a packing density of 0.27, and a microporous membrane pore size of 0.2 μm. The inlet concentration of formaldehyde waste gas is 460mg / L, and the flow rate is 220mL / min. After being treated with the absorption solution (0.5% to 5% by weight concentration of sodium bisulfite solution) with a flow rate of 240mL / min, the formaldehyde concentration in the outlet tail gas is 2.8 mg / L, the removal rate is 99.4%.
Embodiment 2
[0027] according to image 3 The treatment device (three stages in series), the formaldehyde waste gas inlet concentration is 980mg / L, the flow rate is 220mL / min, and it is treated with the absorption liquid (0.5%~5% sodium bisulfite solution) with a flow rate of 240mL / min Finally, the formaldehyde concentration in the outlet tail gas is 0.8mg / L, and the removal rate is 99.9%.
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The invention relates to a technique for the recycling treatment of high-concentration formaldehyde waste gas, which pertains to the technical fields of 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 Mum to 0.3 Mum and the porosity is 0.1 to 0.6; formaldehyde in waste gas is absorbed by adopting a sodium bisulfite solution with 0.5 percent to 5 percent of an absorbent, an absorbing product, hydroxyl sulfonate, which is precipitated after saturated absorption in the sodium bisulfite solution and separated, is utilized as relevant raw material or decomposed in an acid medium so as to obtain pure formaldehyde gas, and the separated sodium bisulfite solution can be recycled as an absorbent after being appropriately diluted, thereby realizing the recycling treatment of the formaldehyde waste gas. The technique combines the traditional chemical absorption treatment method with the high efficient membrane separation technique, can be operated under moderate conditions, namely, at normal temperature and normal pressure, has short treatment period, high treatment efficiency and wide application and can recycle the formaldehyde in the waste gas highly efficiently.
Description
technical field [0001] A high-concentration formaldehyde waste gas resource treatment technology belongs to the technical field of chemical absorption treatment and membrane separation. Background technique [0002] At present, domestic and foreign attention to the treatment of formaldehyde waste gas is mainly focused on the treatment of trace formaldehyde, while the treatment methods for high-concentration formaldehyde waste gas are almost blank. The treatment methods for formaldehyde waste gas are more focused on absorption (physical absorption or chemical absorption), oxidation (catalysis) decomposition, biodegradation or combustion. These methods not only have the disadvantages of long treatment period, low efficiency or high cost, but most of the treatment methods are destructive and cannot effectively utilize the precious resource of waste gas. Relevant reports have not yet been seen on the recycling treatment technology of formaldehyde waste gas, especially high-conc...
Claims
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IPC IPC(8): B01D53/18B01D53/22B01D53/72
Inventor 朱振中王志良汪德成
Owner WUXI ZHONGXING IND ADHESIVE TAPE