SU1299969A1 - Method for producing granulated sodium percarbonate - Google Patents

Description

The invention relates to a method for producing granulated sodium percarbonate used in detergent composition as a bleaching component, and can be used in the chemical industry in the production of household chemicals.

The use of a mixture of synthetic detergent (CMC) with sodium percarbonate in the form of granules, which have a bulk mass that differs significantly from the bulk mass of CMC, leads to delamination of the mixture of CMC during transport and storage, i.e. to the violation of the formulation of the dream composition.

The aim of the invention is to prevent delamination of the mixture of CMC containing granulated sodium percarbonate by reducing the bulk mass of the latter.

Example 1 To prepare a solution of sodium percarbonate solution, 1207 ml of water was poured into a flask equipped with a stirrer, 265 g (2.5 g / mol) of soda ash and 2.65 g (10% by weight of soda) of sodium hexametaphosphate were charged. The dissolution is carried out at 50-60 C.

YU

15

20

25

Put particles of sodium percarbonate in an amount of 300 g with a size of 200-500 microns, obtained by any known method. The prepared solutions of hydrogen peroxide and soda are shifted 50 seconds, then sodium percarbonate solution is dispersed onto the fluidized bed of seed particles.

To prepare an aqueous suspension of sodium percarbonate, 701 g of dry soda ash is charged into a container equipped with a blender and 1125 g of perhydrol (30% hydrogen peroxide solution) are poured in, then 36 g of sodium silicate and 7 g of sodium hexametaphosphate are introduced. When using a 30% hydrogen peroxide solution, the ratio of the solid phase to the liquid in the resulting suspension is 1: 0.75. The resulting suspension is stirred for 0.5 hours at a temperature of from 1 to -5 ° C. The prepared suspension is dispersed onto the core layer of the seed particles, while simultaneously feeding the reaction solutions, the suspension of sodium percarbonate solution is kept in a weight ratio of 1: 1 . The process of growing particles, granulating and suzatem is filtered and added with interruptions for an hour. Unloading 13.25 g (5% by weight of soda) of sodium silicate (liquid glass). In another flask equipped with a stirrer, 425 g (3.75 g / mol) of perhydrol (30% hydrogen peroxide solution) with the addition of 1.0 g of orthophosphoric acid (specific weight 1.7) are poured in to a pH of 1 .In the fluidized bed reactor, having a bottom distribution

Sodium percarbonate granules from the apparatus in the amount of 1432 g (11.03 g / mol) have sizes of 0.7-1.0 mm, contain active oxygen 35 14.37, the bulk per sodium carbonate obtained is 0.51 g / cm.

Analogously to example 1, examples 2-5 are fulfilled, the changed conditions and the results are presented in the table.

grid for supplying hot air, 40 Example 6 is made according to well-known quality spacing material

Put particles of sodium percarbonate in an amount of 300 g with a size of 200-500 microns, obtained by any known method. The prepared solutions of hydrogen peroxide and soda are shifted 50 seconds, then sodium percarbonate solution is dispersed onto the fluidized bed of seed particles.

To prepare an aqueous suspension of sodium percarbonate, 701 g of dry soda ash is charged into a container equipped with a blender and 1125 g of perhydrol (30% hydrogen peroxide solution) are poured in, then 36 g of sodium silicate and 7 g of sodium hexametaphosphate are introduced. When using a 30% hydrogen peroxide solution, the ratio of the solid phase to the liquid in the resulting suspension is 1: 0.75. The resulting suspension is stirred for 0.5 hours at a temperature of from 1 to -5 ° C. The prepared suspension is dispersed onto the core layer of the seed particles, while simultaneously feeding the reaction solutions, the suspension of sodium percarbonate solution is kept in a weight ratio of 1: 1 . The process of growing particles, granulating and drying is carried out within an hour. The sodium percarbonate granules discharged from the apparatus in the amount of 1432 g (11.03 g / mol) have a size of 0.7-1.0 mm, contain active oxygen 35 14.37, the bulk per sodium carbonate obtained is 0.51 g / cm.

Analogously to example 1, examples 2-5 are fulfilled, the changed conditions and the results are presented in the table.

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Claims (2)

1. METHOD FOR PRODUCING GRANULATED SODIUM PERCARBONATE, including the interaction of solutions of hydrogen peroxide with soda ash in the presence of a stabilizer, dispersing the reaction solutions into the drying zone with the seed particles of the product, granulating sodium percarbonate, characterized in that, in order to prevent delamination of the synthetic detergent mixture means containing granular sodium percarbonate, by reducing the bulk density of the latter, simultaneously with the reaction solutions in the drying zone in odyat aqueous slurry of sodium percarbonate in a weight ratio to the amount of slurry reaction solutions equal to (0.25-4): 1. from 2. The method of pop. 1, characterized in that they use an aqueous suspension of sodium percarbonate having a solid to liquid ratio of 1: (0.6-0.9). SU „1299969 1299969 '