High yields, high purity melamine manufacturing process

Details High yields, high purity melamine manufacturing process High yields, high purity melamine manufacturing process

2005-05-10

2005-05-10

Balasubramanian, Venkataraman (Department: 1624)

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

C544S203000

Reexamination Certificate

active

06891040

ABSTRACT:
The process to recover both melamine and oxyaminotriazines (OAT) from the mother liquors of melamine crystallisation comprising the following steps: a) addition to a melamine and OAT containing aqueous solution at high temperature of an alkaline agent until the solution pH reach a value equal or higher than 11; b) most of melamine crystallisation by solution cooling; c) separation and recovery of precipitated melamine; d) acidification of the obtained solution, after precipitated melamine separation, in order to reach a pH of about 7; e) the suspension obtained in d) above after precipitated melamine recovery, is subject to filtration according to tangential filtration technique obtaining a clear permeate which contains as a solution all melamine which did not precipitate in step b) and a retentate comprising of OAT dispersion; f) OAT deprived mother liquors from e) are recycled to row melamine solution preparation step; in such a way almost the total amount of melamine, which did not precipitate in step b), is recovered; g) OAT are recovered from step e) retentate by using any conventional separation technics.

REFERENCES:
patent: 2647119 (1953-07-01), Haworth et al.
patent: 2863869 (1958-12-01), Elmer et al.
patent: 3250773 (1966-05-01), Christoffel et al.
patent: 3423411 (1969-01-01), Dakli et al.
patent: 3496176 (1970-02-01), Kennedy et al.
patent: 091 174 (1983-10-01), None
patent: 9506042 (1995-03-01), None
DOE?EM-0370-Innovative Technology Summary Report: Cros Flow Filtratiom 1998.*
Bucher Cross Flow Filteration.

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