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Paraformaldehyde manufacturing process introduction
For many years, China's formaldehyde industry has made great strides in terms of production scale, output, quality and technology. In many ways it has approached or reached the international advanced level, Formaldehyde downstream products - paraformaldehyde has a vast space for development.
Currently, There are two paraformaldehyde production processes: one is the vacuum rake drying production process, and the other is the spray drying production process.
1. Rake drying production process
Formaldehyde first dehydration after concentration, Formaldehyde concentration increased from 37% to 65%,Then into the rake dryer for further dehydration, Dry to powder discharge. The entire dehydration process is operated under negative pressure, Evaporative condensate
containing 10-15% of formaldehyde return formaldehyde section, Configured as 37% formaldehyde export or preparation for methylal and urotropine. The process is intermittent operation, each rake dryer feed 4-5m3, drying time is 4-6 hours, the production cycle is long, low productivity, the product was powder lumps.
2. Spray drying process
Formaldehyde is subjected to secondary condensation under vacuum to raise the formaldehyde concentration to 85% and then pump into the spray dryer. Concentrated formaldehyde spray through the nozzle, condensed into a granular paraformaldehyde solid. The process of continuous production, concentrated formaldehyde spray granulation time is short, can form a linear short formaldehyde molecular chain, so the product is water-soluble.
Paraformaldehyde production precautions
Paraformaldehyde produced by the solution of formaldehyde curing,
Among them, the relationship between the cooling and curing temperature of formaldehyde solution and the formaldehyde concentration shows that: Excessive temperature can even cause formaldehyde and water to evaporate at the same time, and the formaldehyde loss is serious. Temperature is too low Dehydration of formaldehyde is slow, And easily lead to the depth of formaldehyde polymerization, product water solubility is poor, so polymerization drying temperature control is very important.
Paraformaldehyde engineering case
Heze Taier Chemical Co., Ltd. 10,000 tons paraformaldehyde means
Hong Yuan technology rake dry cell area Paraformaldehyde device overview
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