SU1234361A1 - Method of producing sodium polyphosphate - Google Patents

Description

The invention relates to the technological content of the main substance of the rot of obtaining phosphorus salts in phosphates (P, 0 in the finished product), in particular, glassy polyphos- is 69.0%. The hygroscopicity of sodium fates, such as Graham's salt, and sodium polyphosphate, is determined not to be used in textiles, 5 samples weighing 1 g by the increment of oil and mining sectors, its mass due to absorption of atmospheric moisture. month

The purpose of the invention is to reduce the temperature of 2 months, in an atmosphere saturated with water absorption by water polyphosphates at / desiccator, filled with sodium while maintaining high water content, humidity 95%. Lrirazhi main substance in it. The weight of the mass was 0.0069 g per

Example 1. Take 250 g of one- 1 g in 48 hours, i.e. hygroscopicity

is 0.68% for 48 hours or 10.2% for 1 month. storage of the finished product ..

substituted sodium phosphate and 0.005 g of clay additive, which is 0.002 wt.% based on the weight of monosubstituted sodium phosphate. The mixture of salts is thoroughly mixed: it is stirred, melted at and kept in the oven for 30 minutes. Next, the melt is cooled with the remaining examples (2-11) presented in the table, performed in the same way as in Example 1, but differ in the types and amount of input at a rate of 50 deg / min to a room temperature of 20 minutes.

with a thickness of 5 mm. Ob- Results are tabulated.

Clay0,0005

Clay0.001

Known to 0.0005

Known to 0.001

Clay 50% +

known to

50% 0.0005

Clay 50% +

known to

50% . 0.001

Cement ga lam

Cement lice

0.0005 0.001

69.7

69.7 69.6 69.5

Cement sludge (clay 25% + known to 75%) 1.5 67.8 0.003

Prototype 0.005-0.5 68.8-69.2 1.34-2,

The remaining examples (2-11), presented in the table, are made analogously to example 1, but differ in the types and amount introduced before

7.118.9 30.1

0.343.8 8.3

9,822.0 36.5

0.476.h 15.2

0.305.3 15.2

10-1320,14-24 37-38

As can be seen from the data presented in the table, with an increase in the concentration of the additive in an amount greater than the upper limit (1%), the content of the main substance in the finished product (will fall, although the hygroscopicity of the product will be low, i.e. than the prototype (example 10), i.e., the goal of the proposed solution is to reduce the hygroscopicity of the target product while maintaining

high content of the main substance is not achieved.

When using the concentration of the caps-containing additive is 0.0005%, i.e. lower than the claimed interval (examples 2 and 4), the goal is not achieved and the value of hygroscopicity is greater than that of the prototype. Therefore, the proposed additive concentration range is 0.001-1%.

Claims (1)

METHOD FOR PRODUCING SODIUM POLYPHOSPHATE Phosphate, including mixing monosubstituted sodium orthophosphate with a substance that reduces the hygroscopicity of the product, melting, holding the melt and then cooling it, characterized in that, in order to reduce the degree of hygroscopicity of the target product while maintaining a high content of the main substance in it, as an additive use clay and / or limestone in an amount of 0.001-1% by weight of monosubstituted sodium orthophosphate. ye oe 00 cx I 234361