Method of processing alcohol production wastes

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of processing alcohol production wastes: concentrate of head impurities of ethyl alcohol (CHI) and an intermediate fraction of ethyl alcohol (IFEA). The method involves obtaining a water-alcohol solution of CHI or IFEA with density (0.837-0.940) g/cm3 (I) and conducting continuous extraction of impurities (C3-C5 alcohols, esters, carbonyl compounds) in a packed column with a mixture of aromatic hydrocarbons (II) or a mixture of aromatic and aliphatic hydrocarbons (III) with ratio of volume flow I: II or, respectively, I : III, equal to 1:(1-4) (preferably 1:1.2). To intensify mass exchange into solution (I), (0.1-0.5) wt % mixture (IV) of anionic alkyl sulphates and noionic oxyethylated alkyl phenols in ratio (25-20):(70-75) wt% (IV). The desired processing products: raffinate - aqueous of ethanol with weight ratio of the latter equal to (80-20) wt % can be used to obtain high-purity edible ethyl alcohol and as an anti-icing agent for glass used on cars, and extract - solution of alcohol and esters in a mixture of hydrocarbons is used to prepare mixed solvents for the paint industry.

EFFECT: high efficiency of the method of processing alcohol production wastes.

4 cl, 8 ex, 1 tbl, 2 dwg

 

The invention relates to a method of processing waste alcohol production: concentrate head of impurities ethyl alcohol (CAS) and intermediate fractions of ethanol (PFAS).

The method consists in obtaining a water-alcohol solution (I) of the CSE or PFAS density (0,837-0,940 g/cm3possibly the introduction for process intensification (0,1-0,5)% wt. mixtures of surface-active substances (IV), consisting of (20-25)% wt. anionic number of alkyl sulphates and (70-75)% wt. nonionic surfactants of a range of ethoxylated ALKYLPHENOLS, and conducting continuous extraction of impurities: alcohols With3-C5, esters, carbonyl compounds from a solution (I) a mixture of hydrocarbons that do not contain benzene, with the temperature of the end boiling point not higher than 170°C: aromatic (II) or aliphatic C7-C9and aromatic content of the last not less than 60 wt.%, (III) in the Packed column at a volumetric ratio of expenses I:II or I:III = 1:(1-4) (1:1,2).

Target products: the raffinate aqueous solution of ethanol mass fractions of the latter (80-20)% wt. depending on the density of the solution (I) used to produce food ethyl alcohol of high purity, as well as windscreen de - icer car; the extract - solution of alcohols and complex the esters in the mixture of hydrocarbons used for the preparation of mixed solvents for paints and varnishes.

Description of the invention

The invention relates to the field of chemical technology, namely the method of processing waste alcohol production: concentrate head of impurities ethyl alcohol (CAS) and intermediate fractions of ethanol (PFAS).

KGP and PFAS obtained by rectification afuraldehyde fraction (EAF)formed in the primary distillation of crude alcohol. Rectification AAF conducted to better allocation of ethanol. AAF number is 2-6% from conventional crude alcohol is heavy going. Separation of mixtures of alcohols contained in the waste alcohol production, there are many patents. In particular, the selection of ethanol from various compounds by hydrogenation with hydrogen [A.S. Czechoslovakia 268100, MKI SS 29/04, 31.07.1990] or in the form of a mixture with toluene [A.S. USSR 1620442, MKI SS 31/10, 15.01.1991]. These methods are cumbersome and unsuitable for separation of KGP and PFAS.

We have patent No. 2272018, 11.09.2004 "Method of waste treatment in alcohol production (options)designed for non-waste processing of KGP and PFAS. The method is carried out by direct distillation KGP and rectification PFAS mass transfer in a rotary machine MPA-200 in the presence of an alkaline agent selected from the range: hydroxides, carbonates, bicarbonates of potassium or sodium, calcium oxide, ammonia water, taken in the quantity of 0.01-,0)% wt. and the temperature of the cube (80-86)°C.

The distillate obtained from the distillation of KGP and rectification PFAS, used to make solvents for varnishes NTS or windscreen de-icer (binary mixture), VAT residue - as an additive in the fuel oil, which increases its fluidity. The way waste.

The disadvantages of this method is the high energy intensity, the need to use corrosion resistant equipment, as well as the fact that the processing of alkaline agents is destroyed (hydrolysis of esters contained in KGP and PFAS. It is known that esters are the most active part of the mixed solvents for paints and varnishes [Saidenberg, Ethico. Solvents for paints and varnishes. - L.: Chemistry, 1980].

The disadvantages of the method can also include a high water content as residue of the distillation and rectification, used as an additive in the fuel oil.

The MSE according to the norms of THE 9182-478-00008064-2002 has a composition, % wt.:

- ethanol - 70-88;

- aldehydes, - not less than 0,3;

- esters, not less than 3,0;

- methanol, not less than 2,0;

water - the rest.

PFAS according to the norms of THE 9189-479-00008064-2002 has a composition, % wt.:

- ethanol - 23-73;

- water - 25-75;

- alcohols With3-C5not less than - 2.

According to chemical analysis according to GOST 5964-82 p "ethyl Alcohol is rectified. Methods of analysis of the content of esters in PFAS is 0.1-1.0% wt.

The aim of the invention is to waste less energy consuming way of recycling alcohol production - KGP and PFAS.

This goal is achieved by the fact that preparing aqueous-alcoholic solution of CSB or PFAS (I) adding water to the density (0,837-0,940 g/cm3and perhaps the introduction (0,1-0,5)% wt. mixtures of surface-active substances (IV), consisting of (70-75) % wt. neinogennye surfactant of a range of ethoxylated ALKYLPHENOLS and (20-25)% wt. anionic surfactants from a number of alkyl sulphates increase the intensity of mass transfer, conduct continuous extraction of higher alcohols With3-C5, esters and aldehydes from (I) a mixture of aromatic hydrocarbons containing benzene, the temperature of the end boiling point not higher than 170°C (II) or a mixture of aliphatic C7-C9and aromatic hydrocarbons except benzene, containing the latter not less than 60 wt.%, and the end boiling point not higher than 170°C in the Packed column at ambient temperature when the ratio of the volume of expenditure I:II or I:III = 1:(1-4) (better than 1:1,2). Products extraction: the raffinate aqueous solution of ethanol containing the latter (80-20)% wt. depending on the density of the solution (I) used to produce food ethyl alcohol high flat is clean, as well as windscreen de - icer car "Panorama" on THE other 2384-020-16715043-2008; the extract - solution of alcohols and esters in a mixture of hydrocarbons used for the preparation of mixed solvents for paints and varnishes.

The content of harmful impurities - methanol in the raffinate less than 0.03 wt.%, below the standards established for food products (technical product - windscreen de-icer is none); the content of methanol in the extract does not exceed 1,2% wt., the content of aldehydes does not exceed 0.3%, and is obtained from the extract, the solvent content of these impurities does not exceed, respectively, of 0.6 and 0.15% wt., below established norms for these impurities. Acid number (CC) mixed solvent obtained from the extract, not exceeding 0.15 mg KOH/g, which is much better than the standards prescribed by GOST R 31089-2003 "Solvents for paints and varnishes" (CC≤0.7 mg KOH/g).

The advantage of this method is that valuable component (I) esters are not destroyed, but pass into the extract.

Schema extraction is shown in Fig. 1 and 2.

To obtain a water-alcohol solution (I) MSE or SFC served continuously from storage in the mixer, there from a line of industrial water supply water and intensification of mass transfer, the introduction of a mixture of surface-active substances is (IV) content (0.1 to 0.5)% wt. solution (I). Upon receipt of solution (I) with a density of less 0,860 g/cm3it continuously fed through the side fitting on the bottom of the Packed column filled with rings process and mixture of hydrocarbons (II) or (III). Through the side fitting on top of the column serves (II) or (III)Ceres side fitting at the top of the columns are selected, the raffinate from the bottom of the column - extract.

Upon receipt of solution (I) with density above 0,860 g/cm3it continuously fed through the side fitting in the upper part of the column, and (II) or (III) through the side fitting on the bottom of the column, the raffinate is taken from the bottom of the column, the extract is from the top.

The process is illustrated by the examples in the table, and schema extraction (Fig 1, 2).

Sources of information

1. Author's certificate of the USSR No. 268100, MKI 4 SS 29/04, publ. 31.07.1990,

2. USSR author's certificate No. 1620442, MKI 5 SS 31/10, SS 29/82, SS 11/02, publ. in BI No. 23, 1993

3. Saidenberg, Ethico. Solvents for paints and varnishes. - L.: Chemistry. 1998

4. RF patent №2272018, IPC SS 31/08, SS 29/80, publ. 03.20.2006, (similar).

1. The method of processing the waste is in alcohol production: concentrate head of impurities ethyl alcohol (CAS) and intermediate fractions of ethanol (PFAS), characterized in that the receiving water-alcohol solution of the MSE or PFAS density 0,837-0,940 g/cm3(I) conduct a continuous extraction of impurities (alcohols With3-C5, esters, carbonyl compounds) in the Packed column with a mixture of aromatic hydrocarbons (II) or a mixture of aromatic and aliphatic hydrocarbons (III) if the volumetric ratio of expenses I:II or I:III = 1:(1-4) (better than 1:1,2).

2. The method according to claim 1, characterized in that for the intensification of mass transfer in solution (I) may enter 0.1 to 0.5 wt.% mixtures of anionic surfactants from a number of alkyl sulphates and neinogennye of a range of ethoxylated alkyl phenols at a ratio 25-20:70-75 wt.% (IV).

3. The method according to claim 1, characterized in that (II) a mixture of aromatic hydrocarbons containing benzene, the temperature of the end boiling point not higher than 170°C.

4. The method according to claim 1, characterized in that as (III) a mixture of aliphatic C7-C9and aromatic hydrocarbons with content of not less than 60 wt.%, does not contain benzene, with the temperature of the end boiling point not higher than 170°C.



 

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