SU903366A1 - Method of isolating sodium nitrate from nitrate waste obtained from products in synthetic aliphatic acid production - Google Patents

Description

(54) METHOD FOR ISOLATING NITRATE BY LIFTING FROM NITRATE DRAIN ISOLATED FROM PRODUCTS OF SYNTHETIC MANUFACTURANCE A method is known for isolating sodium nitrate from a nitrate effluent, an alkaline one from the production of synthetic fatty acids, obtained by oxidizing paraffin to produce oxidate, saponifying the latter to produce soapy water, dissolving the latter in water to produce soapy glue, decomposing the latter with nitric acid, evaporation, distillation drying {1. The disadvantages of this method are the energy consumption of utilization of nitrate runoff due to the low concentration of the main substance (15-17%), the poor quality of the product obtained (the content of carboxylic acids in sodium nitrate is more than 5%, of which 3.5% is monocarboxylic acids) Since sodium nitrate, used as a mineral fertilizer,

FATTY ACIDS should not contain organic impurities of more than 5 wt.%. The purpose of the invention is to improve the quality of the target product and reduce the cost of the process. The goal is achieved in that according to the method of separating sodium nitrate from nitrate runoff isolated from products of synthetic fatty acid production, it is obtained by oxidation of paraffin to produce oxidate, saponification of the latter to produce soapy water, dissolving the latter in water of sodium nitrate 24-70% concentrating to produce soap glue, decomposing the latter with nitric acid, marrying off, distilling and drying, dissolving the soap melt in an aqueous solution of sodium nitrate at a concentration of 24-70%. As an aqueous solution of sodium nitrate, use nitrate runoff obtained in the process of its processing. The proposed method includes the following stages: oxidation of paraffin, hydrolysis of the obtained oxidate, its saponification, separation of solvents, preparation of a soapy water.

3903366

its accumulation in nitrate runoff with the subsequent decomposition of the resulting soap glue at a temperature not higher than 80 ° C with 70% HNOs to 50% sodium nitrate in the nitrate runoff, the resulting stock5

evaporated in evaporators of known construction. By distillation of the water vapor, a salt suspension is obtained, after section 1 and 1 of which sodium nitrate is extracted with a content of -.

using organic particles no more than 5% 7 The mother liquor enriched in organic impurities and heavy metals (Fe, Mn, MD) is returned to the evaporation stage or to the decomposition process.

These dependences of the content of organic compounds on the concentration of sodium nitrate in water after decomposition are summarized in table. one.

Table 1

Soap decomposition

Comparison of known and proposed methods for the recovery of NaNOj from

The proposed method allows to improve the quality of the target product by reducing the content of organic impurities to 3.4-4.9% versus 9.3% in the known method, to reduce the cost of the process due to energy savings, which is achieved due to the processing of concentrated nitrate runoff.

Example 1. (known method). 1261 kg of paraffin and 2522 kg of unwashed are oxidized at 120-110 ° C and 3632 kg of oxidate are obtained with an acid number of 70 mg KOH / g, which is washed, and 1031 kg of a 20% aqueous solution of soda ash are obtained (206.2 kg dry) and 462.7 kg of 40% strength alkali (185 kg dry), separated, and 1112 kg of soap water are obtained, which contains 89.7 kg of water-soluble; organics. The latter is dissolved in 3,982.5 kg of water at 80-90 ° C (to a concentration of 21.8%)

7,8

8.0

4.8 4.3

decompose 815 kg of 70% nitric acid at 60-80 ° C and get 1007 kg of fatty acids and 4902.5 kg of nitrate runoff containing 769.7 kg of NaNOs (15.7% concentration with pH 3), 89, 7 kg of organic compounds (1.83%), 4.9 kg of chlorides (0.1%). Nitrate water is fed to evaporation, 3,718.3 kg of water containing 9.7 kg of organic compounds are distilled off, and one stripped off nitrate effluent in an amount of 1,184.2 kg containing 769.7 kg of NaNOj (70.0%) is obtained; 80 kg of organic compounds (6.75%); 4.9 kg of chlorides (0.41%), which is dried and obtain 856.6 kg of the finished product with a sodium nitrate content of 769.7 kg (89.8%); organic compounds 80 kg (9.3%); 4.9 kg of chlorides (0.57%) and water 2.0 kg (0.23%).

Example 2. 1261 kg of paraffin and 2522 kg of uncompressible oxide are oxidized according to the example of the nitrate runoff produced by synthetic fatty acids in table. 2. Tablets 2 5 1, are washed, separated unwashed, and 1112 kg of soap water are obtained, which is dissolved in 1000 kg of nitrate effluent containing 242 kg (24.2%) of sodium nitrate, 15.7 kg kg (1, 57%) organics, 1.6 kg (0.16%) of chlorides at 60-70 ° С. 2288.6 kg of water are added to the solution obtained and 815 kg of 70% nitric acid are decomposed at 60-70 ° C. As a result of the decomposition, 1034.7 kc is obtained in which the layer contains 1005 kg of fatty acids and 29.7 kg of organic compounds from nitrate runoff and 4180.6 kg of nitrate runoff of 24.2% concentration with a pH of 3 containing 65, 7 kg (1.57%) of organics, 6.7 kg (0.16%) of chlorides, 2.1 kg (0.05%) of heavy metals. 1000 kg of this nitrate runoff are returned to the preparation of soap glue, and 3180.6 kg of nitrate runoff containing 769.7 kg (24.2%) of NaNOj, 50.0 (1.57%) of organics, 5.1 kg (0, 16% of the chlorides and 1.6 kg (0.05%) of heavy metals are fed to the evaporation, 2111.6 kg of water containing 10 kg of organic compounds are distilled off, and 1069 kg of evaporated nitrate effluent containing 769 are obtained 7 kg (72.0%) NaNOj 40 kg (3.74%) of organic compounds, 5.1 kg (0.48%) of chlorides, 1.6 kg (0.15%) of heavy metals, which are dried and prepared 818.4 kg of finished product with a content of 769.7 kg (94.0%) of sodium nitrate 40 kg (4.90%) organic with of compounds; 5.1 kg (0.6%) of chlorides; 1.6 kg (0.2%) of heavy metals; n 2.0 kg (0.3%) of water Example 3. 1121 kg of soap water produced in the example 1, is dissolved in 500 kg of nitrate runoff of a 50% concentration (250 kg of NaNOa) containing 12.5 kg (2.5%) of organic compounds, 1.6 kg (0.32% of chlorides and 0.8 kg ( 0.16%) heavy metals; 676.3 kg of water are added and 815 kg of 70% nitric acid are decomposed. As a result of decomposition, 1072.9 kg of a fat layer is obtained, which contains 1022 kg of fatty acids and 50.9 kg of organic compounds from a nitrate drain and 2039.4 kg of a nitrate drain of 50% concentration with a pH of 2.5, containing 51.0 kg (2.5%) of organic compounds, 6.5 kg (0.32%) of chlorides, 3.3 kg of heavy metal salts (0.16%). 500 kg of this nitrate runoff is returned to the preparation of soap glue, and 1539.4 kg of nitrate runoff containing 769.7 kg (50.0%) of NaNOj, 38.4 kg (2.5%) of organic compounds, 4.9 kg ( 0.32%) of chlorides, 26.5 kg (0.16%) of heavy salt salts, are fed to the evaporation. With this, 462.8 kg of water containing 10 kg of organic compounds is distilled off, and 1076.5 kg 6 of one stripped off nitrate effluent containing 769.7 kg (71.5%) of sodium nitrate is obtained; 28.4 kg (2.6%) of organic compounds; 4.9 kg (0.4%) of chlorides and 2.5 kg (0.2%) of heavy metal salts. After the suspension, the resulting suspension is obtained. 807.5 kg of the finished product containing 769.7 kg (95.3%) of sodium nitrate 28.4 kg (3.5%) of organic compounds 4.9 kg (0.6%) of chlorides are obtained. ; 2.5 kg (0.3%) of heavy metal salts and 2.0 kg (0.3%) of water. Example 4. 1121 kg of the melt obtained in Example 1 are dissolved in 500 kg of the stock solution of a 32% concentration (160 kg of NaNOa) containing 11.58% (57.9 kg) of organic compounds; 0.46% (2.3 kg) of chlorides; 0.14 (0.7 kg) heavy metal salts, 463.5 kg of water are added and 815 kg of 70% nitric acid are decomposed. As a result of the decomposition, 1079.5 kg of a fat layer containing 1029.5 kg of fatty acids and 50 kg of organic compounds from nitrate runoff and 1820 kg of nitrate runoff of 51.1% concentration (929.7 kg) of NaNOj with pH 2.0 are obtained ; 5.2% (95.7 kg) of organic compounds; 0.5% (9.3 kg) of metal chlorides; 0.1% (1.9 kg) of heavy metal salts. Nitrate runoff is fed to evaporation, at the same time 487.1 kg of water containing 8jO kg of organic compounds are distilled off, and 1332.9 kg of nitrate runoff of 69.75% concentration (929.7 kg), 6.68 (87 , 9 kg) of organic compounds; 0.7% (9.3 kg) of chlorides and 0.14% (1.9 kg) of heavy metal salts. One stripped off drain (salt suspension) is fed to the centrifugation, 832 G, kg of the final product containing 92.4% (769.7 kg) of NaNOj are obtained; 3.6% (30.0 kg) of organic compounds; 0.8% (7.9 kg) of chlorides; 0.2% (1.2 kg) of heavy metal salts and 3.0% (25.0 kg) of water and 500 kg of stock solution containing 32% (160 kg) of NaNOs; 11.58% (57.9 kg) of organic compounds; 0.46% (2.3 kg) of chlorides and 0.14% (0.7 kg) of heavy metal salts, which are directed to the preparation of soap glue. Example 5. 1121 kg of soap melt obtained in Example 1 dissolve 357 kg of 70% evaporated nitrate runoff (349.6 kg of NaNOj) containing 2.3% (8.2 kg) of organic compounds; 0.4% (1.4 kg) of chlorides; 0.2% (0.7 kg) of heavy metal salts, add 1018.3 kg of water and decompose 815 kg of 70% nitric acid. As a result of decomposition, 1072.7 kg of a fat layer is obtained, in which 1022 kg of fatty acids and 50.7 kg of organic compounds from nitrate runoff and 2238.6 kg are contained.

S1 of the effluent 50% concentration (1119.3 kg NaNOj) with a pH of 2.5; 2LG (47 kg) of organic compounds; 0.3% (6.2 kg) of chlorides; 0.1% (3.1 kg) of heavy metal salts.

Claims (2)

Nitrate water is fed to evaporation, 639.6 kg of water containing 10.5 kg of organic compounds are distilled off, and 1599 kg of water containing 10.5 kg of organic compounds are obtained, and 1599 kg of evaporated nitrate water of 70% concentration is obtained (1119 , 3 kg NaNOa); 2.3% (36.5 kg) of organic compounds; 0.4% (6.2 kg) of chlorides; 0.2% (3.1 kg) of heavy metal salts, 357 kg of this nitrate water are fed to the preparation of soap glue, and 1242 kg are fed for drying. After drying, 809.4 kg of the finished product containing 769.7 kg (95.1%) NaN, 3 kg (3.5%) of organic compounds are obtained; 4.8 kg (0.6%) of chlorides; 2.4 kg (0.3%) salts / ton of yellow metals; 4.2 kg (0.5%) of water. Claim 1. Method of separating sodium nitrate from nitrate runoff isolated from products production of synthetic fatty acids, obtained by oxidation, of paraffin with obtaining oxidate, saponification of the latter with obtaining a soap melt, dissolving the latter with obtaining soap glue, decomposition of the latter with nitric acid, extraction, distillation and drying, characterized in that, in order to improve the quality of the target product and making the process cheaper, soapy water is dissolved in an aqueous solution of sodium nitrate at a concentration of 24-70%. 2. A method according to claim 1, characterized in that as a water solution of sodium nitrate, nitrate drain is used, which is obtained during its processing. Sources of information taken into account during the examination 1. Russian patent number 19623, cl. C 07 C 53/00, 1929 (prototype).