SU1279968A1 - Method of extracting cyclerine from waste water of synhtetic resin production - Google Patents

Abstract

The invention relates to wastewater treatment, specifically to sorption methods for the extraction of glycerin, and allows an increase in the degree of recovery, a decrease in the residual glycerol content in the purified water, as well as the mindfulness of energy costs. The essence of the method is that the wastewater is contacted with activated anthracite modified with water-soluble polymers: polyvinyl alcohol, methacrylamide, polypropylene glycol or polyacrylamide, and anthracite and polymer are taken in a ratio of 1: 0.04-0.1, and the desorption of glycerol is carried out isopropyl alcohol. The recovery rate is up to 96.3%. 1 hp f-ly, 3 tab.

Description

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Claims (2)

The invention relates to the treatment of wastewater from dissolved organic compounds, in particular, to the method of cleaning wastewater from the production of synthetic epoxy resins from glycerol. The purpose of the invention is to increase the degree of glycerin release from wastewater from the production of epoxy resins. After the preliminary extraction of polyglycerol, wastewater from the production of epoxy resins is subjected to multi-step purification from glycerol by modified adsorption on a modified antra; b, under static conditions, to concentrations acceptable for biological purification or discharging into water, with subsequent desorption of glycerol with isopropyl alcohol, taken in The ratio of coal: isopropyl alcohol 1: 7. The anthracite modification is carried out with water-soluble polymers: polyvinyl alcohol, methacryl amide, polypropy-schenglycol or acrylamide. The modification is carried out at a modifier: coal ratio of 0.04-0, 1: 1. After desorption from -prolyl alcohol, the desorbate is dispersed. Distilled isopropyl alcohol is reused in the process. Extracted glycerin is used as a marketable product. Regenerated anthracite after washing with distilled water, heated before, is used again. PRI me R 1. Prepare a 1% solution of polyvinyl alcohol in hot distilled water at 80–100 ° C. The treatment of activated apta gta is carried out with an aqueous solution of polyvinyl alcohol at room temperature and a stirring speed of 120 rpm on a shaking apparatus for 3 hours. The ratio of solution: carbon 10: 1, modifier: coal 0.1: 1. The treated anthracite is washed with distilled water until no modifier is present in the wash water, then dried to constant weight. Under static conditions, the sorbent is contacted with waste water containing glycerin up to 29 g / l, table salt up to 240 g / l at a stirring speed of 120 rpm for 3 hours at an optimum pH of 9.0. Sorption capacity for glycerin 0.52 g / g coal. 82 Under the conditions of Example 1, the modification of anthracite is carried out with polyvinyl alcohol in the ratios modifier:: coal from 0.09: 1 to 0.04: 1 and adsorption under static conditions. The data on the treatment of activated anthracite with modifiers and on the adsorption of glycerol are given in Table 1. First and second. Prepare a 1% solution of methacrylamide in distilled water at room temperature. In Example 1, activated anthracite is treated with methacrylamide solution and adsorbed under static conditions. The ratio of modifier: coal 0.07: 1. Sorption capacity for glycerin 0.38 g / g coal. . PRI me R 3. Prepare a 1% solution of polypropylene glycol in hot water at 80-100 ° C with stirring for 2 hours. In Example 1, the activated anthracite is treated with a solution of polypropylene glycol and adsorbed under static conditions. The ratio of modifier: coal 0.05: 1. Sorption capacity for glycerin 0,28 g / g coal. EXAMPLE 4 A 1% solution of polyacrylamide in water is prepared with stirring for 2.5 hours. In Example 1, activated anthracite is treated with a solution of polyacrylamide and adsorbed under static conditions. The ratio of modifier: coal 0.04: 1. Sorption capacity for glycerin 0.2 g / g coal. PRI me R 5. The introduction of glycerol was carried out on unmodified anthracite. Activated anthracite is soaked for 24 hours} out of distilled water, dried at 105-110 ° C for 24 hours. Under static conditions, glycerol is adsorbed from waste water containing up to 29 g / l glycerol, up to 240 g / l sodium chloride at a stirring speed of 120 rpm for 3 hours at an optimum pH of 9.0 The sorption capacity for gly; erine 0.05 g / g coal. As can be seen from the data table. 1, The sorption capacity of unmodified anthracite is 4-10 times lower than the modified one. Example 6. 55 g of sorbent modified with polyvinyl alcohol (according to example 1) and 1 l of waste water containing glycerol to 29 g / l and table salt up to 240 g / l are loaded into the mixer. Under static conditions, glycerol is adsorbed under vigorous stirring for 3 hours and an optimal pH of 9.0 is chosen. Cleaning on this coal is carried out in 4 steps. Consequently, a fresh portion of the sorbent is introduced into the purified water after each step. The total consumption of the sorbent 220 g / l. The content of glycerin in purified water after multi-stage purification is 1.062 g / l. The degree of purity is 96.3%. De-sorption of glycerol is carried out with isopropyl alcohol at room temperature and a stirring speed of 120 rpm for 40-50 minutes. The isotherms of adsorption and desorption are the same. The ratio of coal: isopropyl alcohol 1: 7. The stripping obtained after separation from the coal is directed to the distillation. Distilled isopropyl alcohol is used repeatedly in the desorption process. Glycerin is dried at 50-60 ° C under vacuum (10-20 mmHg). The extracted glycerin is used as a marketable product. The recovered coal is washed with distilled water heated to 60 ° C, and the coal is used for reuse: water 1:10. Under the conditions of Example 6, wastewater is produced by producing epoxy resins by multistep adsorption on activated anthracite modified with water-soluble polymers in different ratios, followed by desorption of glycerol with isopropyl alcohol, taken in the ratio of carbon: 1: isopropyl alcohol 1: 7. The results of sewage treatment of the production of epoxy resins by multistage adsorption on anthracite modified by various water-soluble polymers, and its conditions are given in Table. 2. Comparative characteristics of the proposed and known methods are given in Table. 3. EXAMPLE 7. Glycerol is extracted from the wastewater of epoxy resin production under the conditions of a known method. 8 Sewage water containing 29 g / l glycerol, 240 g / l sodium chloride, in an amount of 2000 ml is evaporated in a rotary evaporator at 100 mmHg. Evaporation of the solution and separation of the salt are carried out step by step. The solution is evaporated to a glycerol concentration of 88%. Filtration is carried out in vacuum at 300 mmHg. Cotton filter cloth is used for filtering. In order to obtain a concentrated product (98-99%), glycerin was separated by IJ3 of the evaporated solution by distillation (partial condensation) in vacuum at a residual pressure of 1012 mm Hg. The output of the distillate is from the mass of glycerin in the source water 52Z. Compared to the known method, the predicted method allows to increase the percentage of glycerin recovery, which is 96.3% of the initial concentration, which significantly exceeds the similar indicator in the known method (56%). In addition, in a known method, the extraction of glycerin from industrial wastewater results in the evaporation and distillation of the bottom residue, which must be further neutralized. In the proposed method, the waste is practically absent, which makes the cleaning method more cost-effective. Claim 1. Method for separating glycerol from wastewater of synthetic resin production, characterized in that, in order to increase the degree of release from epoxy resin production wastewater, wastewater is contacted with activated-anthracite modified with sorbent modified with anthracite - and polymers - POLYWTHE alcohol, methacrylamide, or polypropylene with a col, or polyacrylamide, followed by desorption of glycerol with isopropyl alcohol. 2. 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