SU976600A1 - Process for preparing boron compounds - Google Patents

Description

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The invention relates to the production of boron compounds, in particular, to a method for the isolation of potassium tetraborate from an acid decomposition solution boron bore raw material. A known method of producing potassium tetraborate from a solution of a mixture of potassium hydroxide and boric acid with the ratio VLO “: K20” 1. An aqueous solution of boric acid is treated with a solution of potassium hydroxide or an equivalent amount of potash when heated or boiled and the target product crystallizes with an output. The use of expensive boric acid as a starting material containing boron, as during the processing of borate ore boric acid, the degree of use of boron contained in the raw material is 7b -78 | „. The closest in technical essence and we achieve the result is the decomposition of boron raw materials, which, as an acid reagent, use aqueous condensation of the liquid paraffin oxidation process, containing monocotonic acids in the following ratios, w / d: formic 10- 15 g propionic and oily 1-5. The mixture of reagent and borate ore is boiled for 60 minutes, filtered and boric acid is separated from the filtrate. The yield of the latter is 76. The disadvantage of the method is the incomplete use of the raw material (76% boron) and the low yield of the product. The purpose of the invention is to increase the yield of the product and the degree of raw material utilization. The goal is achieved by the method of obtaining boron compounds, including decomposition boron-containing raw material with water condensate of the process of oxidation of liquid paraffins producing synthetic fatty acids containing acids in the following ratios, weight D: formic 10-15 acetic propionic, oily, the rest is water, at a temperature of 25-30 ° C. The decomposition solution, the minute of the separation of the insoluble residue and the crystallization of boric acid, is treated at the boiling point for 10-15 minutes with potassium carbonate, taking 02 in the amount of 80-110% of the stoichiometric amount in relation to the calcium content and magni. The resulting precipitate, containing calicium and magnesium carbonates and the dissolved borticate ore, is filtered off. Potassium tetraborate is crystallized from the mother liquor, the yield of the latter, calculated as boron contained in the feedstock, is 22%. Example 1 of a 6% aqueous solution of water condensate of the following composition,% by weight: formic acid 12, acetic acid 8, propionic acid 5, butyric acid 1, water, the rest is decomposed by 8, Og borate ore composition,%: 16.87 22.5 CaO, 9.73 MgO, 26.35 SO, insoluble residue (in acid) 13.2 at temperature 25 ° C for 60 min. The resulting solution (decomposition degree of boron 100%), the components in the following ratio, mg / l: 3371.6 2820.3 CaO; , 5 MDO and, 7 50z, are treated with 2.9512 g of potassium carbonate, taken in an amount of 70 from stoichiometric, and kept at a temperature with stirring for 10 minutes until complete wasp} of calcium and magnesium carbonate and gypsum precipitate is filtered and potassium tetraborate is crystallized from the filtrate. Potassium tetraborate yield 80L The yield of the product according to a known method is 60%, Example 2 by an aqueous solution of aqueous condensate (composition, weight: formic acid 12, acetic acid 8, propionic acid 5, butyric acid 1, water - left flax) decompose 8.0 g of borate ore (composition, -SD: 16.87 ВгОз; 2215 СаО; 9.73 МDO, 26.35 SOg, residue insoluble in acid 13.2) at a temperature of 30 ° С for 60 min The resulting solution (degree of decomposition over boron 100) containing, mg / l: 3376.0 2820.3 CaO; , 5 MDO and, 7 SO, are treated, 216 g of potassium carbonate, taken in an amount of 100% of stoichiometric, and vyder; is carried out at a temperature of 95 ° C by stirring for 10 minutes until complete precipitation of calcium carbonate and magnesium is precipitated. The precipitate is filtered off and

their filtrate crystallizes tetrabo: rat potassium o its 88% yield,

The product yield by a known method in this case, 66%,

Example 3- 6% solution of water condensate of the following composition,% of%: formic acid 12, acetic acid 8, propionic acid 5, butyric acid 1, water, the rest, decompose 8.0 g of borate ore with the following composition: 16, 8 22.5 CaO; 9.73 MdO and 26.35 50z, a residue insoluble in acid - 13.2 at a temperature of 25 ° С for 60 minutes „

The resulting solution (decomposition degree of boron 100%), containing, mg / l: 3376.21 2820.26 CaO,, 52 MDO and 1042.66 50, is treated with potassium carbonate in an amount equal to 110% of the stoichiometric

(, 6376 g) and kept at a temperature of 95 ° C with stirring for 10 minutes until complete precipitation of calcium, magnesium and gypsum carbonates. The precipitate formed is filtered off and potassium tetraborate is crystallized from the filtrate. Exit of potassium tetraborate 92%. The yield of potassium tetraborate according to the known method is 69%.

The implementation of the proposed method allows to increase to 80-92% the degree of use of borato raw materials relative to 76% of the prototype.

By processing a suspension of borate raw material with a water condensate of the process of oxidizing liquid paraffins producing synthetic peaceful acids in the presence of potassium carbonate, it is possible to directly obtain potassium tetraborate from a raw material with a high yield of product /

Claims (2)

METHOD FOR PRODUCING BORN COMPOUNDS, including treatment of borate feedstock with water condensate of the process of oxidation of liquid paraffins of the production of synthetic fatty acids with subsequent separation of the product from the precipitate, with the exception that in order to increase the yield and degree use of raw materials, potassium carbonate is introduced into the suspension. 2, The method according to π, 1, characterized in that the process of processing the borate feedstock with aqueous condensate is carried out at 25 ° C ° C, and potassium carbonate is taken in an amount of 80-100% of the stoichiometric amount, and the treatment is carried out at a boiling point for 10- 15 minutes. 00992.6