Title:
CONTINUOUS PRODUCTION METHOD FOR AMINO TRIMETHYLENE PHOSPHONIC ACID CRYSTAL
Document Type and Number:
WIPO Patent Application WO/2021/073198
Kind Code:
A1
Abstract:
The present invention provides a continuous production method for an amino trimethylene phosphonic acid crystal. The specific operation method comprises: preheating an amino trimethylene phosphonic acid liquid product having an active content of 50 to 60%, performing a gas-liquid separation, and then continuously pumping same into a distillation tank at a constant speed; when the active content of the material being greater than or equal to 70% after performing distillation and concentration, subjecting the high-temperature material to condensation, and then sequentially completing stage-by-stage automatic feeding between 1 to n stage crystallization tanks connected in head and tail series, and performing stage-by-stage continuous crystallization under conditions of stirring and natural cooling; finally, in the n-stage crystallization tank, cooling the temperature by circulating condensation, and maintaining at a system temperature of 20°C; after sufficient crystallization, separating and drying same so as to obtain the amino trimethylene phosphonic acid crystal product having an active content of greater than or equal to 95%; and collecting and recycling the mother liquor obtained by separation. In the present invention, the closed single-tank crystallization in the traditional method is changed to an assembly line crystallization which is more suitable for industrialization, the final product has a suitable particle size and stable quality, none of the three wastes are generated, and no crystal promoter and crystal nucleus are introduced.
Inventors:
QI XIAOJING (CN)
CHENG ZHONGFA (CN)
CHEN CHENGXIAO (CN)
WANG NINGNING (CN)
LIN XUEZHOU (CN)
LIU QUANHUA (CN)
CHENG ZHONGFA (CN)
CHEN CHENGXIAO (CN)
WANG NINGNING (CN)
LIN XUEZHOU (CN)
LIU QUANHUA (CN)
Application Number:
PCT/CN2020/105781
Publication Date:
April 22, 2021
Filing Date:
July 30, 2020
Export Citation:
Assignee:
SHANDONG TAIHE WATER TREAT TECH CO LTD (CN)
International Classes:
C07F9/38
Foreign References:
| CN110642886A | 2020-01-03 | |||
| CN110642887A | 2020-01-03 | |||
| CN210595870U | 2020-05-22 | |||
| CN101597305A | 2009-12-09 | |||
| CN101016314A | 2007-08-15 | |||
| CN101143752A | 2008-03-19 | |||
| US3346488A | 1967-10-10 |
Other References:
WANG, T. ET AL.: "Recent Progress of Continuous Crystallization", JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, vol. 54, 15 June 2017 (2017-06-15), XP085141193, ISSN: 1226-086X, DOI: 10.1016/j.jiec.2017.06.009
Attorney, Agent or Firm:
JINAN SPRINGS PATENT&TRADEMARK OFFICE (CN)
Download PDF: