The method of purifying ethyl alcohol

 

(57) Abstract:

Usage: in the electrical industry and as a solvent when carrying out optical measurements. The inventive product is ethyl alcohol. BF C2H6O optically transparent to 210 nm. Ethyl alcohol is purified by treatment with sodium borohydride, taken in an amount of 0.001 to 0.3% by activated carbon adsorption and subsequent rectification. 2 Il. table 1.

The invention relates to a method of purifying ethyl alcohol, which finds wide application in the electrical industry and as a solvent when carrying out optical measurements.

A method of obtaining ethyl alcohol intended for optical measurements, by rectification and holding simultaneously the adsorption of pollutants alcohol impurities activated carbon in the vapor phase [1] the Disadvantages of this method are the inability of multiple cleansing alcohol because of the low adsorption capacity of coal at elevated temperatures, the need for selection in the process of rectification dirty fraction indicates the low efficiency of treatment and leads to the loss of the target product.

Nabolister the Transmittance in the UV region of the spectrum by passing contaminated ethanol through activated charcoal, followed by distillation, the best results are achieved by passing through activated carbon pre-diluted with water up to 40-50%-aqueous solution of alcohol with a speed of 2-5 cm3/cm2min [2] Obtained by a specified method, the alcohol has far-border acquisitions in the field of 240-250 nm.

The disadvantages of this method are the need to use pre-diluted with water or alcohol, which leads to losses of the target product, the formation of contaminated flows and increasing energy consumption at the stage of selection of the target product by distillation from the aqueous solutions, low efficiency due to the low adsorption capacity of coal.

The process of purification of ethyl alcohol by pretreatment of the concentrated ethyl alcohol with sodium borohydride, taken in an amount of 0.001 to 0.3 wt. of passing it through activated charcoal and selection of the distilled spirits rectification allows to obtain high purity ethyl alcohol, suitable for optical measurements. Using this method increases the effectiveness of activated charcoal in the treatment process ethyl alcohol, reduces losses of the target product and simplifies the, that the increase of its concentration above 0.3 wt. no effect on cleaning efficiency and does not only leads to increased consumption of the reagent. The processing of the purified ethyl alcohol sodium borohydride is preferably carried out at 20-50aboutC.

In Fig. 1 presents the proposed installation; Fig. 2 a plot of the border transmission purified ethanol concentration sodium borohydride (processing at the 30aboutC).

Evaluation of the effectiveness of the proposed method of purifying ethyl alcohol to the requirements of optical purity was carried out in a continuous laboratory plant (Fig.1), which includes the tank 1 equipped with a stirrer and thermorelay, dosing pumps 2, 3, adsorber 4, filled with activated charcoal, the intermediate tank 5, the Packed column 6 rectification, refrigerator 7 and the collector 8. Working conditions of the laboratory setup and the results are shown in the examples. As a criterion of efficiency of purification of the selected indicator "long-wave boundary of the transmittance in the UV region of the spectrum, characterized by the wavelength at which the transmittance alcohol layer thickness of 1 cm is equal to 100% and this rate was determined on a spectrophotometer SF-26.

the e features: volume fraction of ethyl alcohol 96,2 about. the concentration of aldehydes in terms of acetic aldehyde of 6.5 mg/DM3, far-border transmission of 287 nm.

Ethanol is loaded into the container 1 in the amount of 4.0 l by filing in termobumagu capacity of the coolant with a temperature of 26-27aboutWith stirring, the vessel support temperature of 25aboutC. From the tank 1 alcohol pump 2 with a flow rate of 0.2 l/h is fed to the adsorber 4. The adsorber 4 volume of 200 cm3filled with charcoal grade "a", the process of adsorption of alcohol in the adsorber proceeds at 25aboutAfter the adsorber alcohol enters the intermediate tank 5. From the intermediate tank 5 alcohol pump 3 with a flow rate of 0.2 l/h is fed continuously to the distillation column 6 of the Packed type (column filled with a nozzle made of spirals of size 2,h,0 mm), where the following operation modes of the column produce a purified alcohol: temperature of top 78,0-78,3aboutTemperatures cube 85-86aboutWith, reflux number of 4.0. Within 16 h of testing selected 3090 cm3purified alcohol. The effectiveness of the cleaning process alcohol assessed by determining the rate of "long-Wavelength limit bandwidth" samples of purified alcohol through 2,0 h, 14 l test and the total sample, these indicators are the following: through 2,0 h 228 nm is rectified in example 1. In the load capacity 1 4 l of ethanol, with stirring ethyl alcohol is heated to 30aboutWith and dissolving 0.64 g of sodium borohydride, stirring after dissolution is continued for 30 min at 30aboutWith the concentration of sodium borohydride 0.02 wt.). Then treated with sodium borohydride ethyl alcohol from the tank 1 by the pump 2 with a flow rate of 0.2 l/h fed into the adsorber 4, which is filled with fresh charcoal grade "a". The adsorption process proceeds at 30aboutC. Next, similarly to example 1 by distillation in column 6 produce a purified ethanol for 16 h tests selected 3105 cm3ethyl alcohol with the following far-border transmission: through 2,0 h 212 nm, after 14 h 214 nm, the total sample of 213 nm.

P R I m e R s 3-8. The cleaning process of ethanol is carried out analogously to examples 1, 2. The results presented in the table.

A comparative analysis of the results shows that the process for obtaining optically transparent ethyl alcohol by pre-treatment with sodium borohydride, taken in an amount of 0.001 to 0.3 wt. adsorption activated carbon, separation of the pure product by distillation can increase the degree clean the IDA sodium lower than 0.001 wt. (example 6) leads to deterioration in the efficiency of cleaning, handling alcohol with sodium borohydride preferably in the temperature range 25-50aboutC. by increasing the temperature to 60about(Example 7), a deterioration of the quality of the secreted product.

The use of this method allows to obtain optically transparent to 210 nm ethyl alcohol, to increase efficiency in the use of activated charcoal in the treatment processes of ethyl alcohol and to increase the duration of use of coal to these goals.

The METHOD of PURIFYING ETHYL ALCOHOL by adsorption with activated carbon and subsequent distillation, characterized in that ethyl alcohol to the stage adsorption pre-treated with sodium borohydride in the number 0,001

0.3 wt.

 

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