The sulfur dioxide absorbent

 

(57) Abstract:

The invention relates to a method of cleaning gases from sulfur dioxide. the invention consists in the use as absorbent SO2concentrate metasulfite obtained by the condensation of acetone with a mixture of formaldehyde and gas condensate. The capacity of sulfur dioxide per 1 g of the adsorbent is 275 mg/year 5 of table.

The invention relates to the refining and petrochemical industry and can be used in oil refining, petrochemical and gas industry.

The proposed mixture of ketosulfone is of practical value and can be effectively used as an absorbent of sulfur dioxide. Known methods for cleaning gases from sulfur dioxide with the use of sulfolane [1] . The disadvantage of this method is the lack of selectivity in the selective purification of gases from SO2in the presence of nitrogen oxides. In addition, sulfolan is expensive synthetic reagent (purchased abroad), which reduces the utility and industrial applicability of the method.

Known methods of absorption of sulfur dioxide using as the absorbent oil sulfoxidov and sulfones [2,3]. the DTIE selectivity of the absorber in the presence of oxides of nitrogen.

A common disadvantage of known methods is the difficulty of obtaining, as in the synthesis process oil sulfoxidov and sulfones using hydrogen peroxide (explosive reagent). Moreover, the oxidation reaction of sulfoxidov to sulfones flows is difficult, with heavy losses and the formation of large quantities of wastewater.

Known use in the cleaning process, as well as in the regeneration of saturated sulphurous anhydride hexamethylphosphorotriamide of aminoacetanilide formula

- where R is piperidino, morpholino or diethylamino and 1,1,3,3-tetrakis (dibutylaminoethanol)propanone-2 [4,5].

The disadvantage of this method is costly synthesis as absorbent, so aminoacetanilide, which is obtained on the basis of individual nitrogen compounds and mercaptans.

The use of ketosulfone absorbents such as sulfur dioxide unknown. The only known use of individual metasulfite and concentrates metasulfite derived from mercaptoundecanoic gas-condensate and oil, as extractants noble metals and plant growth regulators [6].

For the authors was totally unexpected new NWO who is expanding the range of absorbents and sulfur dioxide and the ability of the industrial process.

This goal is achieved by applying metasulfite obtained by the condensation of acetone with a mixture of formaldehyde and gas condensate or oil containing mercaptan sulfur (0.2 to 0.6 wt.%) in aqueous-alcoholic medium at room temperature in the presence of caustic soda and triethylmethylammonium chloride (TEBAH), followed by separation of the target product extraction 60-86% sulfuric acid. Condensation occurs within 5-15 min at a mass ratio of the condensate (oil):TEBAH 100:0,2-0,1. The method uses the following composition of the condensates (table.1.).

P R I m e R 1. In a round bottom flask, equipped with a mechanical stirrer, contribute 0.5 g of sodium hydroxide and 2.5 g of distilled water. The mixture is stirred to dissolve the caustic soda in the flask under stirring serves 100 g of the Orenburg gas condensate containing 0.4 wt.% mercaptan sulfur, 2.5 g of isopropyl alcohol, 0.375 g of paraform, 1.1 g of acetone and 0.06 g TABAH. The mixture is stirred until complete conversion of the mercaptans. Control on the completeness of the reaction of mercaptans carried out by potentiometric titration of ammonia nitrate of silver. The results of the analysis indicate that the conversion of mercaptans is 98-99 wt.% within 5-15 minutes sustained fashion funnel and after separation of the lower layer is separated. The product remaining in the funnel, washed until neutral and dried. The product is then treated with 30 ml of sulfuric acid 86% concentration. After settling of the phases are separated. In the acid phase, add 150 ml) cooled to 1-5aboutFrom the water. The mixture defend 3 hours After that lower acid layer is separated, remaining in the funnel concentrate metasulfite washed with water until neutral and dried with magnesium sulfate. The output of ketosulfone on the source gas is 2.50 g (2.5 wt.%). Sulfur sulfide is 9.5 wt.%. The results of the experiment are presented in table.2-5.

Tests showed that metasulfite derived from mercaptoundecanoic of condensates, effectively absorb sulfur dioxide. The capacity of the concentrate metasulfite for sulfur dioxide is 275 mg/year it Should also be noted that the resulting concentrate metasulfite practically does not absorb nitrogen oxides. Capacity for hydrogen sulfide and nitrogen dioxide was 9.1 and 15.4 mg/g, respectively (see example 2).

Thus, the proposed method timestribune acetone mixture of formaldehyde and gas condensate allows to obtain an effective absorbent of sulfur dioxide and at the same time to clear the condensates from markups for sulfur dioxide was determined in the absorber of the type of Drexel at a partial pressure of sulfur dioxide 7455 mm RT. Art. at 20 5aboutC. In the absorber downloaded 12,9407 g ketosulfone (weight of absorbent with ketosulfone 70,7596 g; empty weight 57,8189 g), obtained in the conditions of example 1 on the basis of acetone and the Orenburg gas condensate. Then in the absorber filed sulfur dioxide. The absorption of sulfur dioxide was determined by the weight of the absorber. Experiments show that after 2 h saturation of the absorbent material and the mass of the absorber is equal to 74,3182, the Increase in the mass of absorbent material is 74,3182-70,7596 = 3,5586, Thus, the capacity (mg) sulfur dioxide per 1 g of the adsorbent is 3,5586:12,9407 = 0,275 g/g = 275 mg/year In similar conditions, the capacity of ketosulfone for hydrogen sulfide and nitrogen dioxide was 9.1 and 15.4 mg/g, respectively. In these conditions, the nitric oxide offered by the sample metasulfite practically not absorbed. After saturation of the gas absorbent fully regenerate as follows: absorbent is heated to 50-80aboutC for 15-30 min, absorbent blow air at 20-30aboutC for 5-10 minutes Weight used absorbent equal 12,9400,

The advantage of using metasulfite received by timestribune acetone mixture of formaldehyde and gas as sulfur dioxide absorbent is: simplicity is E.

THE SULFUR DIOXIDE ABSORBENT.

The use of concentrate metasulfite obtained by the condensation of acetone with a mixture of formaldehyde and gas as sulfur dioxide absorbent.

 

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