METHOD OF CLEANING OPTICAL DETAILS Russian patent published in 1994 - IPC

FIELD: optical equipment. SUBSTANCE: details are washed in the first bath containing the solution of N-methyl-4-pyrrolidone (MPD), triethanolamine and oleic acid while simultaneously ultrasonic power is applied to the details. Further the details are washed in the bath containing alkaline solution while simultaneously ultrasonic power is applied and washed in a flow-through water and in a solution including a dewatering agent. The improvement is in that prior to the details being immersed into the bath with alkaline solution they are washed in the additional bath containing a water. The contents of the last bath are vacuum-distilled and the water distilled is recycled just into this bath. The still residue of the distillation and the contents of the first bath are subjected to distillation followed by recirculating the distilled MPD to the first bath and the water - to the additional bath. EFFECT: reduced the content of MPD in the sewage water by 100-300 times and to save its expense as a raw material due to its regenerating and recirculating to the process. 1 cl, 1 dwg