SU1237668A1 - Method of producing meleme phosphates - Google Patents

Description

The invention relates to an improved process for the preparation of melem phosphates, which find use as fire-retardant substances in various compositions, in particular in the manufacture of linoleum.

Zl invention - a simplified process.

Example 1. A mixture of 100 g of melamine and 67 g of pyrophosphoric acid is heated to 275 ° C and stirred at this temperature for 1.2 hours. Obtain 144 g of product or 95% of the stoichiometric content with melem 55.1% and jOg 35.7%. (Vmesleno for melem pyrophosphate - melem content 55.05% and PjOj 35.86%).

Example 2 about A mixture of 50 g of chalk No. 1-on, 50 g of cyanuric acid and 28 g of orthophosphoric acid is heated at and, as in Example 1, mixing is carried out. Table 1. summarizes the results of the experiments.

for 0.5 h. 88 g of product are obtained or 96% of the stoichiometric content with melem is 68.8% and 22} 5%. (Calculated dp of orthophosphate me-, 15 nan1; ЫХ mixtures at 250-300 С are not evident from the table, pyrolysis of

0,

lems - content of melem is 68.99% and P ,, 0., 22.9%).

R e m i r 3. 30 g of melamine, 30 g of urea and 16.5 g of orthophosphoric acid: ota (Pg content O 72., 4%) is heated at 250 ° C with stirring in TC: 1.5 h 1.5 hours. 46 g of product or 93% of stoichiometric content with melem content of 68% and 22% are obtained.

Example 4. 37 g of melamine, 18 g of ammeline, 7 g of ammelide, 38 g of tscaiuric acid and 51 g of pyrophos ™ foryl acid (content 79s-%) are heated at .300 ° C as in

90

ten

250

250 250 275 275 275

Example 1, within 1 hour. Obtain 112 g of the product or 97% of the stoichiometric content with melem 55.9% and P, 0j 35.0%,

Example 5. 39 g of melamine, 18 g of ammeline, 6 g of am -1elide5 37 g of cyanuric acid, 40 g of urea and 34 g of orthophosphoric acid (content of 72.4%) are heated as in example 1 for 0.5 h 105 g of product or 94.5% of stoichiometric content with mele.ma 69.6% and PgO 21.9% is obtained.

Mixtures of melamine and urea of different composition were kept at 250, 275, and 300 ° C for 2 hours. The reaction products were analyzed for the content of melem, melagin and aminooxotriazi-1UB (ammeline, ammelide, cyanuric acid).

The results of the experiments are given in table.1.

h1; LH mixtures at 250–300 ° C; not at; 1 LH mixtures at 250–300 ° C are not seen from the table; pyrolysis is indicated;

0

five

leads to the formation of melem, there is only a transformation of urea into aminooxotriazines with simultaneous partial sublimatldy of melamine and urea.

Melam n and his cm% s with biuret, with cyan; / rovic acid, with a e-liquor and with ammeline was kept at 250, (for 2 hours) and (for 0.5). The products of the analysis of the content of melem, melamine, and aminooxothrhinoz (cyanuric K15slot, ammelide, ammelkn), the results of the PzG1 s are listed in Table 2.

Table 1

97

7.9

12

4.7

8,8

13.9

Continuation of table 1

Claims (1)

METHOD FOR PRODUCING MELENE PHOSPHATES by the interaction of nitrogen-containing compounds and phosphoric acids at elevated temperatures, characterized in that, in order to simplify the process, melamine or its mixtures with urea and / or aminooxotriazines are used as the nitrogen-containing compounds and the process is carried out at 250-350 ° C.