Process for preparing halogen-containing organic isocyanates

Claim 1

A PROCESS FOR PREPARING HALOGEN-CONTAINING ORGANIC ISOCYANATES, WHICH COMPRISES: REACTING AT 60* TO 190*C, A. A BENZYL CHLORIDE DERIVATIVE OR A MIXTURE OF BENZYL CHLORIDE DERIVATIVES HAVING A NUCLEUS-SUBSTITUTED SUBSTITUENT LOCATED ORTHO TO THE CHLOROMELTHYL GROUP, SAID SUBSTITUENT HAVING A STERIC INTERACTION WITH THE CHLOROMETHYL GROUP AND HAVING A HALOGEN CONTENT OF AT LEAST 80 PERCENT BY WEIGHT, PROVIDED THAT SAID SUBSTITUENT IS NOT F FLUORINE ATOM, THE REMAINING CARBON ATOMS OF THE NUCLEUS BEING UNSUBSTITUTED OR SUBSTITUTED BY HAOLGEN, METHYLMONOHALIDES, METHYLIHALIDES, METHYLTRIHALIDES, VINYLDIBROMIDE, OR PHENYL, B. AN ALKALI METAL CYANATE SELECTED FROM THE GROUP CONSISTING OF LITHIUM CYANATE, SODIUM CYANATE, POTASSIUM CYANATE AND MIXTURES THEREOF, THE AMOUNT OF B BEING IN THE RANGE OF FROM 0.5 TO 2.5 MOLES PER MOLE OF CHLORINE ATOM OF THE CHLOROMETHYL GROUP OR GROUPS OF A, IN THE PRESENCE OF C. AT LEAST A CATALYTICALLY EFFECTIVE AMOUNT OF AN AMINE COMPOUND OR MIXTURE OF AMINE COMPOUNDS HAVING A STRUCTURE SUCH THAT IT DOES NOT CAUSE SUBSTITUTION WITH THE CHLORINE ATOM OF THE CHLOROMETHYL GROUP OF A. SAID AMINE COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF DIPHENYLAMINE, N-CYCLOHEXYLANILINE, TRIPHENYLAMINE, TRIMETHYLAMINE, TRIETHYLAMINE, TRIPROPYLAMINE, TRIBUTYLAMINE, DIMETHYLANILINE, DIETHYLANILE, PYRIDINE, PICOLINE, CORYDINE, QUINOLINE, NMETHYLMORPHOLINE, N-ETHYLMORPHOLINE, N-KPHENYLMORPHOLINE, TRIETHYLENE DIAMINE, N-METHYLPIPERIDINE, N-ETHYLPIPERDINE, N-ETHYLPIPERIDINE, N-PHENYLPIPERIDINE, N,N-DIMETHYLPIPERAZINE, N,N-''DIETHYLPIPERAZINE, DIMETHYL FORMAMIDE, DIETHYL FORMAMIDE, DIMETHYL ACETAMIDE, TETRAMETHYLUREA, N-METHYLPYRROLIDONE, FROMYLMORPLHOLINE, ACETYLMORPHOLINE, FORMLYPIPERIDINE, ACETYLPIPERIDINE, N-METHYL PHTHALIMIDE, AND QUATERNARY AMMONIUM SALTS FORMED FROM THE FOREGOING AMINES, UNTIL A HALOGEN-CONTAINING ORGANIC ISOCYANATE IS FORMED, AND RECOVERING FROM THE REACTION MIXTURE SAID HAOLGEN-CONTAINING ORGANIC ISOCYANATE.