Production of amino lower alkyl hydrogen sulfates

Claim 1

IN A PROCESS FOR THE PRODUCTION OF AN UNSUBSTITUTED AMINO LOWER ALKYL HYDROGEN SULFATE WHEREIN A LOWER UNSUBSTITUTED ALKANOLAMINE IS REACTED WITH CONCENTRATED SULFURIC ACID AT AN ELEVATED TEMPERTURE, THE IMPROVEMENT OF HEATING SAID ALKANOLAMINE WITH SAID SULFURIC ACID IN A FIRST REACTION ZONE MAINTAINED AT A TEMPERATURE OF FROM ABOUT 50* TO ABOUT 150*C., THEREBY FORMING A REACTION MIXTURE COMPRISING THE SULFURIC ACID SALT OF SAID ALKANOLAMINE IN SAID FIRST REACTIN ZONE, AND RAPIDLY HEATING SAID REACTION MIXTURE IN A SECOND REACTION ZONE MAINTAINED AT A TEMPERATURE OF FROM ABOUT 150*C. TO ABOUT 180*C. AND PROVIDING A HIGH RATIO OF HEATING SURFACE AREA TO REACTION MIXTURE, THEREBY CONVERTING SAID SULFURIC ACID SALT OF SAID LOWER UNSUBSTITUTED ALKANOLAMINE TO THE UNSUBSTITUTED AMINO LOWER ALKYL HYDROGEN SULFATE CORRESPONDING TO SAID SULFURIC ACID SALT OF SAID LOWER UNSUBSTITUTED ALKANOLAMINE.