METHOD OF CONTROLLING HYDROXYLAMINE SULPHATE PROCESS Russian patent published in 2011 - IPC C01B21/14 B01D9/02 G05D27/00 

FIELD: process engineering.

SUBSTANCE: invention may be used in production of photo reagents, herbicides, medicines, and paintwork materials. Crystalliser 1 is used to this end that that comprises initial solution pickup 17, solution boiling point pickups 22, 23 used in making pulp forced by pump 2 to centrifuge 3 to separate crystals from mother solution. This method uses also return solvent flow rate pickup 18 and valve 19, flow rate pickup 20 to compensate solvent losses and valve 21, vessel 4 with mother solution and level pickup 24, mother solution feed pump 5 with flow rate pickup 25 and valve 26, column 6 to isolate solvent from mother solution with heat exchanger temperature pickups 27, 28, 29, heat exchange 11 with pressure gage 32 and valve 33, water circulation pump 7 to maintain rarefaction in column 6, condenser 8, cooler 9, and reflux collector 10 with pipelines. Portion of reflux is forced via flow rate pickup 30 and valve 31 into column 6, while another portion is directed into distillate collector 14 with level pickup 34 and valve 35. Then, pump 15 is used to feed return solvent via pipeline to inlet of crystalliser 1 for loss compensation. Water solution is directed from column 6 into vat liquid collector 12 and, further, for processing. Total load is set at crystalliser 1, as well as solvent-to-hydroxylamine sulphate ratio with flow rate correction. Crystalliser temperature is corrected as well as level in mother solution vessel 4, temperature in column 6, efflux flow rate and level in distillate collector 14.

EFFECT: higher efficiency and quality.

1 tbl, 2 dwg, 1 ex