Production of alkali metal cyanides

Claim 1

A PROCESS FOR THE PRODUCTION OF AN ALKALI METAL CYANIDE BY THE NEUTRALIZATION OF AN ALKALI METAL HYDROXIDE WITH HYDROGEN CYANIDE GAS WHICH COMPRISES INTRODUCING HYDROGEN CYANIDE GAS INTO THE GAS INLET MANIFOLD OF A REACTOR COMPRISING A REACTION CHAMBER IN WHICH THERE IS DISPOSED A GRID OF CLOSELY-SPACED PARALLEL PIPES WITH ORIFICES NEAR THE HORIZONTAL PLANE OF AXES OF THE PIPES SAID PIPE GRID MEMBERS BEING CONNECTED TO SAID INLET MANIFOLD IN SUCH MANNER THAT GAS INTRODUCED INTO SAID MANIFOLD FLOWS THROUGH SAID PIPE GRID MEMBERS AND IS EJECTED THROUGH SAID ORIFICES, INTRODUCING AN AQUEOUS SOLUTION OF AN ALKALI METAL HYDROXIDE INTO THE BOTTOM OF SAID REACTION CHAMBER IN SUCH MANNER THAT THE ENTERING SOLUTION SHEARS OFF THE BUBBLES OF GAS AS THEY EMERGE FROM THE ORIFICES, WITHDRAWING THE REACTION SOLUTION FORM THE TOP OF SAID REACTOR, EVAPORATING SAID SOLUTION IN A CRYSTALLIZER WHERE A CRYSTAL MAGMA OF ALKALI METAL CYANIDE IS PRECIPITATED, RECYCLING AN ESSENTIALLY STATURATED SOLUTION OF THE ALKALI METAL CYNANDE FROM THE CRYSTALLIZER TO THE REACTOR, WITHDRAWING THE CRYSTAL MAGMA FROM THE CRYSTALLIZER AND PASSING IT TO A ROTARY FILTER WHERE THE SOLID IS DREID, RECYCLING THE LIQUID FROM SAID FILTER TO SAID CRYSTALLIZER, AND RECOVERING SUBSTANTIALLY PURE CRYSTALS OF ALKALI METAL CYANIDE FROM SAID FILTER.