Title:
PARAFORMALDEHYDE PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2016/011723
Kind Code:
A1
Abstract:
Disclosed is a paraformaldehyde production method. A formaldehyde solution is used as the raw material, and is evaporated and concentrated to produce fine, soluble, and fluid paraformaldehyde after spray granulation in a spray granulation tower. The paraformaldehyde is transformed into a fluidized bed for drying, thereby obtaining dry paraformaldehyde particles; after concentration, formaldehyde is delivered to the spray granulation tower under a constant pressure and blown out of the top of the tower; at the same time, nitrogen gas and formaldehyde are delivered into the top portion of the spray granulation tower to conduct contact heat exchange in parallel flows. In the present invention, formaldehyde is delivered under a constant pressure and by means of a specially made nozzle, such that the formaldehyde solution can be rapidly dispersed and conduct contact heat exchange with nitrogen gas in parallel flows, thereby ensuring the degree of polymerization and degree of consistency in particle diameters for the paraformaldehyde product. Additionally, paraformaldehyde particles in a cyclonic separator is recovered and delivered to the granulation tower, thereby further enhancing the size consistency of the paraformaldehyde products.
Inventors:
YE ZIMAO (CN)
XIANG JIAYONG (CN)
ZHANG HONGWEI (CN)
HU MIN (CN)
YANG KEQI (CN)
GUO BING (CN)
XIANG JIAYONG (CN)
ZHANG HONGWEI (CN)
HU MIN (CN)
YANG KEQI (CN)
GUO BING (CN)
Application Number:
PCT/CN2014/089886
Publication Date:
January 28, 2016
Filing Date:
December 03, 2014
Export Citation:
Assignee:
JIANGSU KAIMAO CHEMICAL TECHNOLOGY CO LTD (CN)
International Classes:
C08G2/08; C08G2/28; C08G4/00
Foreign References:
| CN104130360A | 2014-11-05 | |||
| CN102443121A | 2012-05-09 | |||
| US4036891A | 1977-07-19 | |||
| US3316309A | 1967-04-25 | |||
| CN201381293Y | 2010-01-13 | |||
| CN101037382A | 2007-09-19 | |||
| CN1560102A | 2005-01-05 | |||
| CN101845130A | 2010-09-29 |
Attorney, Agent or Firm:
YONG HENG PARTNERS (CN)
江苏永衡昭辉律师事务所 (CN)
江苏永衡昭辉律师事务所 (CN)
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