Chemistry: physical processes – Physical processes – Crystallization
Reexamination Certificate
2011-05-17
2011-05-17
Johnson, Edward M (Department: 1736)
Chemistry: physical processes
Physical processes
Crystallization
C422S285000
Reexamination Certificate
active
07942939
ABSTRACT:
A method and installation for the production of a coarse-grained ammonium sulfate product by crystallization includes firstly generating a crystal having a grain smaller than the desired grain size in a pre-crystallizer and withdrawing a suspension therefrom, from which the fine crystal was previously separated in a classification connecting piece. This suspension, which contains medium-sized grain, is then conducted with a proportion of undersaturated mother liquor, which is sufficient for further crystal growth, into a DTB product crystallizer and crystallized therein to a desired grain size. The heating of the product crystallizer is performed by the heat contained in the vapors of the pre-crystallization. The pre-crystallization may also operate according to the DTB principle, wherein the mother liquor needed for crystallization is supplied in the form of separately admixed concentrated sulfuric acid and ammonia into the external solution loop of the pre-crystallizer. The reaction heat released in this case may be sufficient for the operation of the entire process.
REFERENCES:
patent: 4004886 (1977-01-01), Thijssen et al.
patent: 4015946 (1977-04-01), Bonnema et al.
patent: 467103 (1969-01-01), None
patent: 1260440 (1968-02-01), None
patent: 102007014504 (2007-10-01), None
patent: 0632738 (1995-11-01), None
patent: 1094878 (1967-12-01), None
patent: 2005194153 (2005-07-01), None
patent: 0056416 (2000-09-01), None
International Search Report and Written Opinion of the International Searching Authority from corresponding Patent Cooperation Treaty (PCT) Application No. PCT/EP2009/050807, mailed May 8, 2009.
English Translation of the International Preliminary Report on Patentability from corresponding Patent Cooperation Treaty Patent Application No. PCT/EP2009/050807 dated Sep. 7, 2010.
Hofmann Günter
Scholz Reinhard
Gea Messo GmbH
Johnson Edward M
Van Dyke Gardner, Linn & Burkhart, LLP
LandOfFree
Method and facility for producing a coarse-grained ammonium... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and facility for producing a coarse-grained ammonium..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and facility for producing a coarse-grained ammonium... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2703121