RU1789263C - Method of producing sorbent for cleaning oil-contaminated liquids - Google Patents

Abstract

The granules of the coke are treated with a sodium-containing solution in the presence of potassium permanganate in an amount of 2-7 wt.% With further washing of the sorbent from manganese ions. 1 tab.

Description

The invention relates to methods for producing a sorbent for the purification of oily liquids, for example, water vapor condensers, and may find application in the chemical, petrochemical industries, in the power system, etc.

A known method for producing a sorbent for purification of oily liquids, comprising impregnating pitch coke granules with a sodium-containing solution of sodium tripolyphosphate, heat treatment and cooling.

The disadvantages of this method are the preparation of a sorbent with low sorption capacity, as well as the contamination of the first portions of the purified liquid with phosphates and sodium ions.

There is also known a method for producing a sorbent for purifying oily liquids, comprising treating pitch coke granules with a sodium-containing solution in the presence of contaminating oil in the solution, heat treatment and drying.

This method is the closest in technical essence and in the effect achieved and is selected as a prototype.

. The disadvantage of this method is the low efficiency of cleaning the liquid with a sorbent, due to the still low sorption ability of the sorbent and the contamination of the purified liquid with sodium ions.

The aim of the invention is to increase the sorption capacity of the sorbent.

The goal is achieved in a method for producing a sorbent for purification of oily liquids, comprising treating the peaks of peak coke with a sodium-containing solution in the presence of potassium permanganate in an amount of 2-7 wt.% With further washing the sorbent from manganese ions and heat treatment.

A distinctive feature of the claimed method is the implementation of the processing of the sorbent in the presence of potassium permanganate in the amount of 2-7 May. % with further washing of the sorbent from manganese ions,

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In the course of studies, it was found that the sodium-containing alkaline solution removes gummy substances that close micropores on the surface of the sorbent. Potassium permanganate present in the solution promotes oxidation of the surface of the purified micropores. Apparently, in this case additional sorption centers are formed on the surface either due to free radical formation or due to the formation of hydroxyl groups serving as sorption centers.

The method is carried out as follows. 27 wt.% Potassium permanganate is added to the sodium-containing solution, after which it is mixed with the sorbent. The mixture is boiled until water is completely removed, after which it is heat treated at a temperature of 150 ° C for 40 minutes. Then, the treated sorbent is washed with boiling water until the manganese ions are completely removed.

Example: In 20 ml of a solution containing 14% sodium carbonate and 5% sodium bicarbonate, 1 g (5 wt.% Potassium permanganate) is added. The solution is mixed with 20 g of pitch coke of class 1-5 mm. The mixture is boiled until completely removed water, after which it is heat treated at 150 ° C for 40 minutes, Then the resulting sorbent is washed with boiling water from manganese ions until the pink color completely disappears in the water.

The resulting sorbent is loaded into a sorption column with a height of a layer of TO cm. 0.5 L of an oil-water emulsion with an oil concentration of 500 mg / L is passed through it. The degree of absorption of the sorbent by the sorbent is 78.4%. Alkalinity of the purified solution of 0.05 mg.eq / L.

EXAMPLE 2 0.4 g of potassium permanganate, which is 2% by weight, are added to 20 ml of a sodium-containing solution. The solution is mixed with 20 g of pitch coke. The mixture is boiled until water is completely removed, after which it is heat treated at 150 ° C for 40 minutes. The prepared sorbent is washed with water until the pink color in the water disappears completely.

The sorbent is loaded into a sorption column with a layer height of 10 cm. 0.5 L of an oil-water emulsion with an oil concentration of 500 mg / L is passed through it. The degree of absorption of oil by sorbent 5 is 72.2%. Alkalinity of the purified solution of 0.06 mg.eq / L.

Example 3. The same as in example 1, but added on May 7,% KMpSm.

The sorbent absorption of the oil is 73.8%.

The alkalinity of the purified solution is 0.05 mg.eq / L.

Example 4. The same as in example 1, but add 8 wt.% KMpSm. The degree of absorption by the sorbent of oil is 70.8%. The alkalinity of the purified solution is 0.04 mg.eq / L.

Example 5. The same as in example 1, but add 10 wt.% KMpSm. The sorbent absorption of the oil is 68.5%. Alkalinity - 0 cleaned solution of 0.05 mg.eq / l,

PRI me R 6. (By the method of the analogue). The same, but treated with pitch coke on May 15, with a% sodium tripolyphosphate solution.

The degree of absorption is 50.5%. Alkalinity: 5 mg of the purified solution 0.2 mg.eq / l.

PRI me R 7 (according to the prototype). The same, but used a sodium-containing solution impregnated with oil.

The degree of absorption is 64.8%. Alkalinity of the purified solution is 0.3 mg.eq / l.

These examples and test results of the obtained sorbents are shown in the table.

As can be seen from the above examples,

when contained in the processing solution

5 less than 2 wt.% Potassium permanganate, degree

sorbent absorption of oil is reduced

up to 68.5%.

When the content in the processing solution is more than 7 wt.% Potassium permanganate 0, the degree of absorption of oil by the sorbent decreases to 70.8% and carbonization of the sorbent begins.

Technical and economic advantages of the claimed method compared to the prototype method are to increase the efficiency of liquid purification with a sorbent, characterized by an increase in the degree of absorption from 64.08% (in the prototype) to 73.8-78.4% (in for the inflected method). 0

Claims (1)

The claims A method of producing a sorbent for the treatment of oily liquids, comprising treating pitch coke granules with a sodium-containing solution and heat treatment. characterized in that, in order to increase the sorption ability, the treatment is carried out in the presence of 2-7 wt.% potassium permanganate in the solution, followed by washing the sorbent from manganese ions.