Method of deodorizing isopropyl alcohol

 

(57) Abstract:

The invention relates to methods of cleaning isopropyl alcohol, sulfuric acid obtained by hydration of propylene. Raw alcohol with a pH of 9oC 13,5, is treated with a hypochlorite solution is determined by any known method. Then the raw alcohol is subjected to rectification.

The invention relates to the field of organic chemistry, and in particular to methods of cleaning isopropyl alcohol, sulfuric acid obtained by hydration of propylene.

Isopropyl alcohol is widely used in industry for the synthesis of organic products (acetone, amines, esters) as the solvent in the composition of varnishes, paints; for extraction of oils, resins, latexes of natural products as anti-icer to prevent frosting of glass hire and surfaces of the aircraft, multifunctional additives to motor fuel; used in perfumery and cosmetics industry as part shampoos, lotions, hair sprays, pharmaceutical production (Chemical industry abroad, 1980, No. 4, S. 64-65).

Obtained by the method of sulfuric acid hydration of isopropyl alcohol is contained as an impurity, zerooo-cosmetic and pharmaceutical preparations household chemical goods.

A known method of purification of alcohols from unsaturated and sulfur compounds by hydrogenation in the presence of Nickel-chromium or Nickel-copper catalyst, followed by distillation in the presence of a solution of alkali (ed. St. N 157676, class C 07 C, 120 5/01; ed. St. N 190876, class C 07 C, 120 5/02).

The disadvantage of this method is the complexity of instrumentation.

Known purification of alcohols from sulfur compounds by dehydration followed by distillation [1].

The disadvantage of this method is the incomplete removal of foreign smell.

Closest to the proposed invention the technical essence is a method of cleaning isopropyl alcohol [2].

Neutral isopropyl alcohol, raw, containing 10-12 mg/l sulfur, process containing active chlorine substances, such as bleach, hypochlorite, with the addition of a binding formed sulfate ion substances, such as chloride of barium. The resulting solution is treated with 10% caustic soda solution until an alkaline reaction and subjected to rectification. Get rectified spirit, not containing sulfur compounds and the corresponding GOST 8905-61 for other indicators of the CSO method in an industrial environment involves a multi-stage process, the presence of corrosion resistant equipment.

To eliminate the smell of IPS and to simplify the technological process for industrial preparation of IRS, the authors propose to process the raw alcohol, having pH= 9oC13,5, sodium hypochlorite solution and subjected to rectification. The sodium hypochlorite solution served continuously in the flow of crude alcohol with vigorous stirring to achieve a small excess of hypochlorite ions, determined by any known method.

Example 1. Alcohol crude sulfuric acid obtained by hydration of propylene containing 20-25 wt.% isopropyl alcohol, with a pH of 12.0-12,6 at 40-45oC continuously and evenly add a solution of sodium hypochlorite with a concentration of active chlorine 140-170 g/l and a content of free alkali 20-30 g/l in an amount necessary to maintain the potential of the crude alcohol +50oC+100 mV (0.3-0.5 l of hypochlorite solution for 1 m3raw spirit) and direct to the stage of rectification. Obtained after distillation of isopropyl alcohol has no foreign smell.

Example 2. Alcohol crude containing 20-25 wt.% isopropyl alcohol, with a pH of 10-11 at the stage of rectification at 10-20oC continuously and evenly add a solution of hypochloridia 250-350 mW (3-6 l of hypochlorite solution for 1 m3raw spirit). Obtained after distillation alcohol has no foreign smell.

Example 3. Alcohol crude industrial heavy equipment containing 20-25 wt. % isopropyl alcohol, with a pH 12,5-13,0 before stage rectification at 50-60oC continuously and evenly add a solution of sodium hypochlorite with a concentration of active chlorine 140-170 g/l in an amount necessary to maintain the potential of the crude alcohol 100-200 mV (1-2 l hypochlorite solution for 1 m3raw spirit). Obtained after distillation alcohol has no foreign smell.

Thus, the inventive method deodorizing isopropyl alcohol has the following advantages over the prototype:

simplifying technology: the process in one stage instead of five prototype;

conducting the process in an alkaline environment, which prevents corrosion of the equipment and allows the use of equipment made of carbon steel;

the reduction of the process time and reducing thereby the required amount of equipment;

the possibility of automating the process and ensure its stability.

Method of deodorizing isopropyl alcohol, sulfuric acid obtained by hydration of propylene is subjected to treatment with sodium hypochlorite in an alkaline medium at a pH of 9.0 - 13.5 and to achieve an excess of hypochlorite ions.

 

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