Crystallization process
AssigneeEastman Kodak Company
InventorsAlbert P. Huguenard, Michel J. Favre
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Abstract
Fine crystals characterized by improved morphological homogeneity and a narrow size distribution are prepared by introducing a solution of a crystallizable solute in a solvent into a bed of small inert continuously moving solid particles and initiating crystallization within the solution while it is in contact with the moving particles. The process finds application in the manufacture of diverse crystalline products such as, for example, in the formation of metal oxalates, phosphorescent compounds, and silver halide crystals, as well as in the purification of both organic and inorganic materials.
Claims11
In a process of continuously preparing a radiation-sensitive silver halide emulsion wherein
- an aqueous silver salt solution and an aqueous halide salt solution capable of reacting to form radiation-sensitive silver halide grains are concurrently and separately introduced through inlets to a reaction chamber in the presence of a peptizer and
- radiation-sensitive silver halide emulsion is withdrawn at an outlet from the reaction chamber while silver halide grain formation is occurring under steady state operating conditions
- the improvement comprising
- reacting the silver salt and the halide salt within the reaction chamber in the presence of the peptizer in a bed of small, inert, continuously moving solid particles.
Dependencies are inferred from the claim text.