Process for making mono (aminoalkyl) phosphite esters

Claim 1

A PROCESS FOR THE PREPARATION OF A MONO(AMINOALKYL) PHOSPHITE WHICH CONSISTS ESSENTIALLY OF THE STEPS OF: (1) REACTING AT A TEMPERATURE OF AT LEAST 80*C. A MIXTURE COMPRISING A MONOALKANOLAMINE OF THE FORMULA HO-CHR''-CHR-NH2, WHEREIN R AND R'' ARE EACH SELECTED FROM THE GROUP CONSISTING OF A HYDROGEN ATOM AND METHYL, AND AT LEAST ONE PHOSPHORUS COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHOSPHOROUS ACID, LOWER ALKYL PHOSPHITE, LOWER ALKYL PHENYL PHOSPHITE, PHENYL PHOSPHITE, PHOSPHOROUS ACID SALT, LOWER ALKYL PHOSPHITE SALT, LOWER ALKYL PHENYL PHOSPHITE SALT, AND PHENYL PHOSPHITE SALT, SAID SALTS BEING FORMED FROM A VOLATILE BASE; (2) CONCURRENTLY REMOVING FROM THE REACTION PHASE BY-PRODUCTS LIBERATED DURING THE SAID REACTION; (3) THEREAFTER TREATING THE REACTION PRODUCT WITH AT LEAST ONE PARTIONING SOLVENT SELECTED FROM THE GROUP CONSISTING OF WATER-SOLUBLE PRIMARY ALCOHOLS HAVING 1 TO 3 CARBON ATOMS AND WATER; AND (4) SEPARATING THE FORMED MONO(AMINOALKYL) PHOSPHITE AS A CRYSTALLINE SOLID FROM SAID PARTITIONING SOLVENT AND ANY POLYAMIDOALKYL PHOSPHITE PRODUCED THEREWITH.