Taped purification process

Details Taped purification process Taped purification process

1991-07-22

1993-04-27

Hollrah, Glennon H.

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

Organic compounds

Amino nitrogen containing

564144, C07C23305

Patent

active

052064360

ABSTRACT:
Process for purifying, by crystallization, TAED having a titer.gtoreq.99.5% from a mixture containing crude TAED obtained by acetylation of DAED, wherein the purification process is performed in two different stages (1, 2), characterized in that the temperatures at which the stages are performed differ from one another (delta t) by values comprised between 55.degree. and 110.degree..

REFERENCES:
patent: 4240980 (1980-12-01), Muller-Schiedmayer et al.

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