SU876710A1 - Method of pressing cotton soap wastes for producing aliphatic acids - Google Patents

Description

(54) METHOD FOR PROCESSING COTTON IDAINS WITH OBTAINING FATTY ACIDS

one

The invention relates to the oil and fat industry, in particular to methods for processing waste from refining production, in particular cotton soaps.

Soap stock is the largest share in return waste from oil refineries. The rational use of it is one of the most pressing problems. The resulting after refining soap stock is mainly used for the purpose of cleaning food in the form of its distilled fatty acids. In its composition, soap stock contains 40-60% of total fat, including 10-15% of neutral fat, which cannot be separated using conventional methods (heating, settling, etc.) due to: the presence of fragments of surfactants in soap stock. such as phosphatides, proteins, etc.

There are various ways of processing. Soapstocks MF and 2.

Each of them has its advantages and disadvantages.

The closest to the present invention is a method of processing cotton soapstocks to produce fatty acids, including the saping of the soapstock and decomposition with sulfuric acid.

In this method, the soap pellet after saping the stock stock with caustic soda is decomposed by the acid, the released fatty acids are sent to the distillation, and the acidic waters are used to neutralize the sub-base lye, as a result

10 some more of the crude fatty acids from the podmilk liquor, and water containing glycerin and gossypol resin as impurities after filtration from the precipitate,

15 is sent to evaporation. The resulting Ma:, jiS04 is determined and finds its own application | and one stripped off glycerin is used as a technical Gz.

The disadvantage of this method is the presence of large quantities of podmyl liquors and acidic waters, as well as the fact that the water to be evaporated is not used for the needs of production,

25 a is discharged into the sewer. In addition, the process is very energy-intensive.

Claims (3)

The purpose of the invention is to fully utilize the reaction products and thereby increase the degree of wastewater treatment. This goal is achieved by the fact that in the method, including academics / soap stock and decomposition of soap with sulfuric acid, soap stock is carried out by exposure to an aqueous solution of calcium hydroxide with a concentration of 7–10%, taken with an excess of 10–50%, and formed acidic and washings are mixed and neutralized with calcium hydroxide, followed by separation of the gypsum. Soapstocks obtained after refining of cotton oil and 7-10% solution of Ca (OH) 2 are fed to the jet mixer. with an excess of 10-50% in terms of the total fat content in soap stock. The resulting soap is nicknamed with water to remove excess Ca (OH) 2 and Na OH formed according to the 2ROOONa + Oa (OH) j (RCOO) Q, Ca + iNaOH interaction reaction. This also leaches the glycerol produced by the interaction of fat with calcium hydroxide according to reactions (RCOO} 3 3Ca (OH) j 3Ca (RCOO) it-iCjH5COH) a. These washings are again sent to the calcium hydroxide storage tank, and the soap, after washing, is acidified with 30% HgSO4 to release fatty acids. Acidification is also carried out in a jet mixer. The acidic waters are separated after settling. The fatty acids are washed to neutrality and then sent for drying and distillation. Wash and acidic waters are combined, they contain in their composition mainly sulfuric acid, which is removed from the water by precipitating its Ca (OH) as gypsum according to the reaction H, (OH) ,. gypsum is separated by filtration, and water containing a minimal excess of Ca (O ()) is again used to dissolve the Ca (OH) fatty acid flush. Example: 345 g of soap stock with a total fat content of 61.48% is washed with 40.5 g Calcium hydroxide in the form of a 10% solution with a 50% excess. The resulting soap is washed with water to remove excess Ca (OH) 2 and NaOH, obtained during the reaction in the amount of 21.9 g, as well as glycerin in the amount of 3.32 The soap (191 g) is acidified with a 30% strength, in an amount necessary to decompose the soap with a 5% excess. They (179 g) are washed with water until neutral and the washings and acidic waters, containing 32 g of N2.504.) are treated with calcium hydroxide to precipitate gypsum. The resulting gypsum C44 g) is independently used, and water is returned to production. Example 2 A weighed portion of coartcTOKa 254.4 g with a total fat content of 61.48 and a neutral fat content of 9.53 washes in 30.1 g of Ca hydroxide in the form of a 7% solution with a 50% excess. The resulting product is washed with water to remove excess Ca (OH) 2I Na OH, polyethylene oxide during the reaction in an amount of 16.8 g, and also glycerol in an amount of 2.46 g. The soap is acidified with 30% in the amount necessary for its decomposition into fatty acids with 5% excess. The resulting fatty acids (145.35 g are washed with water until neutral, and the washings are acidic water containing gypsum and free sulfuric acid (total HgSO2 content is 27.7 g neutralized with calcium hydroxide, a section of gypsum precipitated (4O, O7 g), and water returns to the production cycle. It is advisable to use Ca hydroxide in the form of a solution of 7-10% concentration. Applying a solution concentration above 10% causes a rapid mass thickening that interferes with the normal course of the process. The effect of excess Ca is also established ( saponis neutral fat with initial content of neutral fat in soap stock of 9.53% Content of excess fat in milliliters Theoretical amount Consumption of excess above 50% Ca (he) 2. impractical, the successive method is economical because calcium hydrochloride is cheaper than caustic soda. It allows Eliminate the formation and discharge of pit liquor and organize closed-flow and low-waste production by returning water to the reverse cycle, which will save fresh water. Gypsum can be used as a stand alone product. 587 The economic effect from the application of the proposed method is up to 1,088,256 rubles / g. Claim Method A method of processing cotton soapstocks to produce fatty acids, including soaping and decomposition of sulfuric acid by sulfuric acid, in order to completely utilize the reaction products and increase wastewater washing in order to fully utilize the wastewater calcium hydroxide solution with a concentration of 7–10%, taken with an excess of 10–50%, formed little washed with water, and the acidic and wash waters are mixed and mixed with calcium hydroxide followed by separation gypsum. Sources of information taken into account in the examination 1. USSR author's certificate "l f 97117, cl. From 11 to 11/00, 1952. 2. USSR author's certificate 379608, cl. From 11 To 13/02, 1971. 3. USSR author's certificate number 136501, cl. C 11 V 13/02, 1960 (prototype).