the way of producing acid with sodium weglanu of, especially with liquids pochodzacej chamber elektrolizera and device to manufacture of weglanu sodium acid with of,especially with liquids pochodzacej chamber elektrolizera

摘要

1504393 Sodium bicarbonate RHONE-POULENC INDUSTRIES 20 May 1975 [22 May 1974 28 Feb 1975] 21589/75 Heading C1A A continuous method of obtaining sodium bicarbonate in crystals of a size larger than those produced by the ammonia-soda process comprises treating sodium chloride diaphragm cell liquor in a first zone with CO 2 -containing gas to produce Na 2 CO 3 which remains in solution, subjecting this solution to the action of CO 2 -containing gas in a second zone to precipitate NaHCO 3 at a temperature below 70‹ C., passing the suspension obtained to a third zone to complete the bicarbonation by the action of CO 2 -containing gas and cooling the suspension to no more than 45‹ C. and separating the precipitated NaHCO 3 . Some of the resulting mother liquor or the suspension may be recycled from the third zone to a point upstream of the point of maximum temperature of the second zone, thus allowing lower maximum temperatures to be used in the second zone, e.g. 40-60‹ C.