SU912233A1 - Method of cleaning gases from acid components on the sorbent - Google Patents

Description

The invention relates to a method for the purification of gases from nitrogen and sulfur oxides by the method of sorption and can be applied in chemical production.

A known method of purifying gases from nitrogen oxides by absorption by their chemically active extractant, for example, tributylLosLat 1,

The disadvantage of this method is the low absorption of nitrogen oxides, which is 8587%.

The closest to the proposed technical day and the achieved result is a method of purification of gases containing nitrogen oxides using solutions of chemical substances — NaCea, NaOH, FeO, and others deposited on a porous carrier, for example, silica gel, aluminum gel 2.

Significant disadvantages of the known method are uneconomical, due to the significant consumption of chemicals for processing the carrier after each cycle; difficulties in the utilization of dilute aqueous solutions of salts formed during the desorption process. Besides . Moreover, the surface of the carriers, for example silica gel, aluminum gel, is insufficient to ensure high chemical activity of the sorbent.

 The purpose of the invention is to improve the degree of gas purification.

The goal is achieved by the fact that according to the method of cleaning gases from acidic components on a sorbent, including a porous carrier

10 and the reactive Phase, as a porous carrier, a copolymer of styrene or nitrilacrylic acid and divinylbenzo a. A are used as the reactive phase.

15 phosphorus-containing extractants or alkylamines introduced into the sorbent in the copolymerization process in an amount of 3070 wt.%.

To trap nitrogen oxides in

20 as an extractant, it is advisable to use tributyl phosphate.,

To capture the oxides of sulfur, as primary agent, primary amines with the general formula

25

, Cr, Ho.n + -iNHo., Where n 10 - 1b.

It is advisable that the content of the extractant in the porous carrier should be 30-70% by weight. .

Use of styrene copolymer

Claims (2)

30 or nitrilacrylic acid with divi-nilbenzene as a carrier will increase the efficiency of the sorbent, because the surface of one gram of the carrier means one; it surpasses the known microtoric system. &Amp; 1, such as silica gel or alumogel, which allows an increase in the acti-1R.stgzs-, contained in its JaK sorben, for example, -) the surface of micro-inclusions of the chemical-active phase of the ttzibutylacetate in 1 g of sorbitol covers an area of 300–400 m. t high degree of purification of gas and ooca;: iae- the working cycle of the sorbent. Higher: and 1e content of extrahex more than 70 leads to deterioration of the mechanical properties of the sorbent, which leads to its loss of jj irodes extra; 1 n, ii. The sorbent data allows to increase the degree of gas purification from acidic oxides to 99.8%. The technology of the proposed process consists in the following. Waste 1 h, and the production-1e gases containing, for example, OXYLET nitrogen, are passed through a layer of dry niozan sorbent or through its water slurry at wearing Vr.gc5, gl. - - 1 The height of the sorbent layer is recovered depending on the volume of the gas being passed through and its linear velocity. Saturated and entrained from the gas by the component is an extraObE sorbent regenerated from water and returned to the cycle. The resulting solution-generators and the aqueous part of the mixtures containing, for example, 160200 g / l a3OT; JOj-i acids, are disposed of in different - L1X1technological-X processes. Steients uav.1 IANI 1azov 99 b99, 8%. EXAMPLE 1. Gases, containing 11), l 7.0 mg / l; Nf 0.6 mg / l, barboti} 5 are passed through 300 ml of solid extractant containing 30% tributyl phosphate, 20 hours at 20-30 C. For 20 hours, 2.4 m of gas is passed at a rate of 2 l / min. After sorption, gases contain NO ,, 0,007 mg / l; NO 0.001 mg / l, which corresponds to a capture rate of 99.9%. The saturated, impermeable sorbent is separated from the aqueous solution of the pulp and subjected to desorption with water under dynamic conditions at a rate of 0.5-1.0 volumes and 1 volume of sorbent per hour at 10-30 C. The completeness of desorption is reached. 1.5-2.0 volumes of regenerate. The resulting regenerates and iodine parts of the pulp saltgdg 150--200 g / l zotnoy acid. Example 3. Exhaust gases formed during roasting of sul-containing raw materials in a fluidized bed containing NO ,, 6.5-7.0 mg / l are bubbled through 3OO ml of aqueous sorbent pulp impregnated with a primary amine. The waste gas temperature is 50 bps. Gases with a speed of 1.5 l / min skip 15 minutes and after sorption contain 0.08-0.13 mg / l sulfur dioxide, which corresponds to the degree of trapping 98.5%. Saturated with sulfur oxides; zbent stand From the aqueous phase of the pulp, desorbed with 10% ammonia solutions: Vac-, 1: 0.25 - 0.3, and then returned to nickel. Aqueous pulp and regenerates contain about 20% ammonium sulfite and ammonium bisulfite. Example 4. 1z containing NOr; 7.0 mg / l; N0 0.5 mg / l, bubbled through 300 ml of aqueous pulp, sorbent containing 50% trioctylphosphine oxide () in a solution of sodium nitrate (150 g / l)., 50 hours at 20-30 ° C and passed 6 m with a speed of 2 l / min After sorption, gases contain NOQ 0.03 mg / l; N0 0.02 mg / l, which corresponds to 99.2% of the degree of capture. Example 5. Gases containing N0o7.0 mg / l; KO 0.5 mg / l, is bubbled through 300 ml of EYUDNA pulp of the sorbent containing 60% di-2-ethylhexyl PhosAoric acid for 50 hours at 2030 ° C. For this, 6 m of gas is passed at a speed of 2 l / g-ting After sorption, the gases contain N0 - 0.008 mg / l; N0 0.06 mg / l, which corresponds to 98.5% of the degree of trapping, Example 6. Gases containing 10.6 mg / l NSB sparged with 300 ml of water sorbent pulp containing 50% trialkylamine, 1.5 h at room temperature and pass 0.9 m at a speed: 1 / min. After sorption, the gases contain O, 1 mg / l PSE, which corresponds to 99-; degree of capture. Further: and the treatment is carried out according to Example 3. In the examples given, the following products are used as a porous carrier: they use the products of joint polymerization of styrene (examples 1 and 3) and di1:; The proposed method makes it possible to increase the degree of purification of exhaust gases from acid components, and the oxides of nitrogen are utilized in the form of nitric acid or salts. Claim 1. The method of gas purification from acidic sorbents on the sorbent, including a carrier and a chemically active Phase, is about 5 91 in that, in order to increase the degree of gas purification, a copolymer is used as a porous carrier. styrene or nitrilacrylic acid and divinylbenzene, and phosphorus-containing extractants or alkylamines used in the sorbent in the copolymerization process in an amount of 3070 wt.% are used as the reactive phase. 2. The method according to claim 1, wherein it is used so that tributyphosphate is used as an extractant for trapping nitrogen oxides. 36 3. The method according to claim 1, of which it is necessary to use primary amines with the general formula CnH (2n + iNH, where n 10 - 16) for extracting sulfur oxides as extractants. , taken into account during the examination 1. USSR Author's Certificate No. 197512, class, C 01 B 21/20, B 01 D 53/04, 1966. 2. USSR patent number 219461, CP. B 01 D 53/04, C 01 B 21/20 ,. publish 1968 (prototype).