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  . 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 .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.
FIELD: gas treatment.
SUBSTANCE: invention is intended for fine purification of gases with removal of carbon dioxide at elevated pressures, in particular in hydrogen or ammonia production processes. Absorbent is an aqueous solution containing N-methyldiethanolamine, piperazine, potassium carbonate, and morpholine. Invention achieves reduced equilibrium pressure and increased carbon dioxide absorption at low degrees of carbonization (as low as 0.1 mole CO2 per mole tertiary amine) without appreciable N-methyldiethanolamine degradation rate.
EFFECT: enhanced carbon dioxide absorption efficiency.
2 dwg, 6 tbl, 2 ex
FIELD: gas treatment.
SUBSTANCE: invention is directed to remove hydrogen sulfide from CO2-containing process gases from enterprises involving heat treatment of sulfur-containing combustible fossils in reductive medium. Treatment comprises countercurrent contact of gases with liquid basic absorbent, absorption of hydrogen sulfide with absorbent, separating hydrogen sulfide from associated carbon dioxide, and converting hydrogen sulfide into usable products. Absorbent is selected from aqueous solutions or suspensions of alkali and alkali-earth metal hydroxides and oxides. Contact of gas with absorbent is performed in vortex chambers provided with rotating gas-liquid layer at residence from 0.001 to 0.1 sec.
EFFECT: increased degree of purification of gases and simplified treatment scheme.
1 dwg, 5 ex
FIELD: gas treatment.
SUBSTANCE: invention relates to compositions for oxidative removal of hydrogen sulfide from gases to produce elementary sulfur, which compositions can be used in oil and gas production, petroleum and gas processing, chemical, and other industries. Absorbent contains, g/L: iron chelate compound (on conversion to ferric ion) 2-12, alkali metal phosphate (on conversion to phosphate anion) 1-16, alkali metal carbonate or hydroxide 1-60, methyldiethanolamine and/or triethanolamine 10-30, monoethanolamine/formaldehyde reaction product 0.2-10, and water to 1 L. Monoethanolamine interacts with 37% formaldehyde solution at molar ratio 1:(1-3). Iron chelate compound is a complex of ferric compound with ethylenediaminetetraacetic acid disodium salt. To reduce foaming, absorbent may further contain 0.05-0.2 g/L aluminum sulfate.
EFFECT: increased stability and decreased corrosive activity of absorbent without loss in its high absorbing capacity regarding hydrogen sulfide.
4 cl, 2 tbl, 5 ex
FIELD: petroleum and gas and other industries; glycol regeneration installations.
SUBSTANCE: the invention is dealt with installations of glycol regeneration with use of vacuum, which may find application in processes of a hydrocarbon gas absorptive drying from a moisture. The invention may be used in gas, petroleum and other industries. The installation includes a saturated glycol feeding pipeline connected through an ejector to an atmospheric column - stripper, which has an outlet branch-pipe of partially regenerated glycol and is fused to the vacuum column supplied with the lower branch-pipe of regenerated glycol withdrawal and the upper branch-pipe of vapors withdrawal, which are linked to a passive nozzle of the ejector. At that the saturated glycol feeding pipeline has a section with two parallel lines, on one of which there is the ejector with a flow meter mounted in front of its active nozzle and connected with a control valve installed on one of the lines. The vacuum column is made in the form of mass-exchange column and equipped with a fixed plate with a located over it branch-pipe of withdrawal of water, a cooling coil in the column upper part and a contact device with low hydraulic resistance in the lower part. The invention ensures efficient regeneration of glycol in the vacuum column and unloading of an atmospheric column - stripper.
EFFECT: the invention ensures efficient regeneration of glycol in the vacuum column and unloading of an atmospheric column - stripper.
3 cl, 1 dwg
FIELD: waste treatment.
SUBSTANCE: invention relates to processing of toxic industrial wastes, more specifically to the process of detoxification of plant-protection chemicals with exceeded storage time or prohibited to use. Utilization of combustion gases consists in passing them through a bed of inorganic metal compound melt disposed in reactor in presence of gaseous oxidant, said inorganic metal compound being a mixture of alkali hydroxides. Gaseous oxidant preliminarily used in excess of at least 3 vol % on the total volume of emission gases is sent to the melt together with emission gases. The latter are introduced from below in such a manner as to assure their contact time with melt at least 2 sec, whereas bed of melt is extended to 0.5-0.8 reactor height.
EFFECT: achieved fullness in trapping toxic components and improved environmental condition.
FIELD: chemical refining of waste gasses.
SUBSTANCE: the invention is dealt with a method of purification of waste gasses of heating and power stations from carbon dioxide by introduction in the waste gas stream of products of incineration of hydrocarbon fuel of an alkaline solution. At that the alkaline solution is fed in a dispersed form into the upstream of the waste gasses moving in a turbulent mode in the space of the stalk of the heating and power station. In the capacity of the alkaline solution they use circulating water of ash removal of the heating and power station. A dispersed alkaline solution is fed into the base part of the stalk of the heating and power station. Before use of the circulating water of ash removal increase its alkalinity by mixing it with the ash from consequent separation of the solution and the ash residue by settling and filtration. At that alkali is extracted from ash into the water. The invention ensures increased completeness and speed of interaction of the components at the expense of use of energy of the purified stream of the waste gasses.
EFFECT: the invention ensures increased completeness and speed of interaction of the components due to use of energy of the purified stream of the waste gasses.
FIELD: petrochemical and chemical industry; purification of gas mixtures from carbon dioxide.
SUBSTANCE: the invention is pertaining to the field of purification of gas mixtures from carbon dioxide. Absorption is conducted using wipers with resistance by a gas of no more than 50 kPa. At that a solution of ethanolamine in the process of the absorption at least once is subjected to intercooling to 30-35°C. Fine regeneration of a stream of a solution of ethanolamine is realized by its treatment with machining by a live steam. The absorber is made with packet-type nozzles and contains in its middle part at least one contour of cooling made in the form of a device of withdrawal of a partially saturated solution of the absorbent cyclically linked with an intermediate container and an intermediate cooler. A hot-water boiler of the regenerator-recuperator is made in the form of the sections in series located in its lower part. The sections are consisting of heat exchangers placed on plates. At that the number of the sections of the hot-water boiler is chosen within the limits from three to six. In the double-flow circuit the outlet of the roughly regenerated absorbent is made in the form of an outlet of the blank plate located under the hot-water boiler. The regenerator-recuperator in its lower part above an outlet of the finely regenerated absorbent is supplied with an inlet of the steam feeding and with three or four steaming plates located above it. The invention allows to reduce an over-all excessive pressure of the process of purification of gas mixtures from carbon dioxide and its partial pressure, to reduce specific power inputs for purification and also to expand the field of application of the ethanolamine purification.
EFFECT: the invention allows to reduce the over-all excessive and partial pressure of the process of gas mixtures purification from carbon dioxide and to expand the field of the ethanolamine purification application.
12 cl, 7 ex, 3 dwg
FIELD: heat-power engineering; cleaning flue gases from toxic admixtures.
SUBSTANCE: proposed method includes cooling of flue gases to temperature below dew point, condensation of water vapor, mixing of cooled flue gases with ozone-and-air mixture, oxidation and absorption of nitrogen oxides and sulfur oxides by condensate thus obtained and discharge of cleaned flue gases and condensate from zone of treatment. Flue gases and acid condensate are cleaned from carbon dioxide in perforated units of cassettes coated with layer of slaked lime [Ca(OH02] for forming calcium nitrite [Ca(NO3)], calcium carbonate (CaCO3) and calcium nitrate [Ca(NO3)]. Device proposed for realization of this method includes zone of treatment in form of box with heat-exchange and absorption-and-heat exchange sections located in this box in way of motion of flue gases. These sections are provided with air and flue gas inlet and outlet branch pipes where heat exchangers-air preheaters of 1st and 2nd stages, horizontal and vertical perforated cassettes units made from rough corrosion-resistant material coated with layer of slaked lime [Ca(OH2)], mixing chamber with perforated distributing tube and air duct with ozonizer are located.
EFFECT: enhanced ecological and economical efficiency and reliability.
3 cl, 1 dwg