SU1433484A1 - Method of cleaning air from mercaptans - Google Patents

Abstract

The invention can be used in gas industry in natural gas odoring plants, in chemical and other industrial areas for cleaning ventilation emissions from mercaptans. In order to increase the degree of gas purification from mercaptans in the presence of acidic components, an absorbent based on an aqueous slurry of iron hydroxide with the addition of calcium oxide is used, which eliminates acidic absorption solutions due to the absorption of acidic components contained in the air. The concentration of iron hydroxide and calcium oxide (hydroxide) in the solution is maintained at a level of 2-10 g / l, 3 tabLo (L

Description

 with

with

NU

00 4

The invention relates to the purification of t asoB from sulfur compounds and can be used in the gas, chemical and other industries.

The purpose of the invention is to increase the degree of air purification.

Example 1: A 200 liter of air is passed through a packed lbsorber with a diameter of 50 mm and a height of 000 mm, the composition of which is ethyl mercaptan at a concentration of 10 mg / m and carbon dioxide at a concentration of € 00 mg / m, 100 ml of absorption are poured into the absorber pulps with the concentration of iron hydroxide 1.0 g / l, calcium oxide 2.0 g / l. The degree of air purification from mercaptans is 95%.

The conditions and results of analogous-gchglk experiments for the examples are given in Table "1

It can be seen that the degree of purification depends on the concentration of calcium hydroxide S in the absorption solution and at its concentration from 2 to 10 g / l.

is 100%.

Example 9. Purification of mercury-monopolymer with T.iHoB is subjected to air in quantities of BiJ 1000. The concentration of mercaptans in the treated air is 100 3 concentration of two carbon dioxide (600 mg / m). Absorb the body solution by pumping it through an electric vector, where it is mixed with treated air, after which the solution is collected in circulating tanks, and the purified air is discharged into the atmosphere.

I Technological operating modes of the installation of t4nov in similar examples 9-14 n4 solutions of different composition are given in tabLo 2,

From the above data it can be seen that at low concentrations of iron hydroxide in solution (1 g / l) it is not possible to achieve the necessary degree of air purification from mercaptans. With a high content of hydroxide

iron significantly increases the cost and concentration of solids in the spent solutions.

Example 15. In this series of examples, the method is carried out under conditions in which in addition to mercaptans hydrogen sulfide, oxides of nitrogen, sulfur dioxide or hydrogen chloride are contained in the treated air. Air containing 100 mg / m3 of mercaptans and 600 mg / m of one of the acidic components (NOx, SOj or HCl) in an amount of 1000 is treated in the ejector with a solution consisting of iron hydroxide (6 g / l) and calcium oxide (6 g / l). After cleaning, the air is discharged into the atmosphere, and the solution is returned to the circulating system. In purified air, the content of mercaptans is determined, the concentration of which is practically zero.

Some technological data are given in table. 3

From the data in the table it can be seen that when hydrogen sulfide is present in the mixture, calcium oxide in the absorption solutions is practically not consumed, but the total consumption of the absorption solutions increases compared to purifying air from mercaptans in the presence of other acidic components,

Invention Formula

The method of air purification from mercaptans by contacting with an aqueous solution of iron hydroxide, characterized in that, in order to increase the purity, in the presence of acidic components in the gas, calcium oxide is added to the aqueous slurry in the following ratio of components, g / l:

Iron Hydroxide 2-10 Calcium Oxide 2-10

WaterTo i l

Table 1

The concentration in the solution of iron hydroxide, g / l

Calcium oxide solution concentration, g / l

Consumption of absorption solution, l / h

for mercapt absorption (5 times)

to absorb carbon dioxide and preserve the necessary alkalinity

The degree of air purification by mercaptans,%

The concentration of the solid phase in the spent solution, g

The cost of the spent solution, rubles / day

1 11

11 11

ten

ten

500500625208125

500500454545

208125625208125

96 97100100100

3-, 03.02,47,312

1,782,1616,7557,43,5

Air concentration of mercaptans, mg / m

The concentration of the acid component in the treated air, mg / m

The concentration of calcium oxide 1 in the absorbent, g / l

Hydroxide concentration

t

100100100

100

600600600

600

Claims (2)

Formula ’of the invention cleaned air emitted into the atmosphere The method of purification of air from mercaptans by contact with water Technological operating modes of the installation c. similar examples of 9-14 n4 solutions of various compositions are given in table. 2. From the above data it can be seen that at low concentrations of iron hydroxide in the solution (1 g / l) dd, it is not possible to achieve the necessary degree of air purification from mercaptans. With a high content of hydroxide of iron hydroxide, characterized in that, in order to increase the degree of purification, in the presence of acidic components in the gas, calcium oxide is additionally introduced into the aqueous pulp in the following ratio of components, g / l: Iron hydroxide 2-10 Calcium Oxide ₍ 2-10 Water up to 1 L Table 1 Examples The composition of the absorption solution \ The composition of the air mixture Degree of purification ^With ge (he) _} ; g / l ^With Co (OM) ₄ 1 g / l 'g: - ^S PH "g / m ^{3 With} from ₁ "g / m ³ 1 1,0 2.0 0.01 0.6 95 2 2.0 6.0 0.01 0.6 100 3 6.0 10.0 0.01 0.6 100 4 3.0 3.0 0.2 oz 100 5 3.0 6.0 0.2 oh s 100 6 10.0 2.0 0.01 0.6 100 7 3.0 1,0 0.2 0.3 96.5 8 6.0 - - - thirty (prototype) Table 2 Example Indicator ------ ------- 9 R ^oh G T ^p s 14 Concentration in solution iron hydroxide, g / l 1 1 1 eleven eleven eleven The concentration in the solution of calcium oxide, g / l 2 6 10 2 6 10 Absorption solution consumption, l / h 625 500 500 625 208 125 to absorb mercaptans about (5x) 500 500 500 45 45 45 to absorb carbon dioxide and maintain the necessary alkalinity 625 208 125 625 208 125 The degree of air purification by mercaptans,% ⁹⁵ 96 97 100 100 100 The concentration of the solid phase in the spent solution, g / l 2,4 3.0 s oh 2,4 7.3 12 The cost of the consumed solution, rub / day 1.75 1.78 2.16 16.75 57.4 3,5 Indicator Air consumption m ³ / h The concentration of mercaptans in the air, mg / m ³ The concentration of the acid component in the treated air, mg / m ³ The concentration of calcium oxide in the absorbent, g / l The concentration of iron hydroxide in the absorbent, g / l Calcium oxide consumption, g / and The degree of purification of air from mercaptans,% Absorbent consumption, l / h Table 3 Acid component H ₂ s N0 _x S0 ₂ HC1 .--1 -----—. 1000 1000 1000 1000 100 100 100 100 600 600 600 600 6 6 6 6 6 6 b 6 0,0 442 525 460 100 100 100 100 570 500 500 500 Editor S. Lisina Compiled by E. Kornienko Tehred I. Veres Corrector N. King Order 5478/3 Circulation 642 Subscription VNIIIPI of the USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushskaya nab., D. 4/5 Production and printing company, Uzhhorod, st. Project, 4