SU797741A1 - Method of preparation absorber for cleaning gases from sulphuric compounds - Google Patents

Description

the ratio of oxide of cycl to suspension is from 1: 1 to 1: 7.

In addition, the treatment is carried out with a suspension containing 1-10 wt.% Sludge (in terms of the calcined product) at concentrations of carbon dioxide and ammonia in the ammonium carbonate solution - 50-180 g / li 80160 g / l, respectively.

The introduction of ishama into the absorber increases the catalytic properties, stability and thermal stability of the absorber over time (retains high activity, sulfur content and absorption depth of hydrogen sulfide from the gas during the overheating).

Example 1. Prepare Samples of 1.5 liters of ammonia-carbonate solution (AKP) with a concentration of carbon dioxide and ammonia - 50-120g / l and 80-160 g / l, respectively, the sludge obtained by anodic dissolution in NaCe aqueous solution on the ECHO-1 serial semi-automatic machine, one of the heat-resistant nickel alloys, the chemical compositions and grades of which are listed in Table. 1. Humidity of sludge / v70%, content of MCE 10% The slurry is stirred in an ammonia-carboxylic solution for 0.5 h at 40-5o C. At. this part of the sludge dissolves.

200 g of technically inactive zinc oxide (NTSO-M GOST 2D276 grade) with a specific surface area of carbon dioxide are added to the resulting suspension and stirred for 1 hour at 40-50 ° C until complete dissolution of zinc oxide. Then, technical zinc oxide is added to the mixture in the amount indicated in Table 3, to obtain a ratio of 7 O: Acre indicated in Table. 3, and stirred at 50-60 ° C for 2 hours. The resulting mixture was dried at 100-110 ° C with stirring for 9 hours, then calcined at 350-380 seconds until a loss on ignition reached 5% by weight. Brand Composition of alloy,% of alloy Cg MP W Co Mo Ti Niomik 5920 0.5–16 EI-617 7215 0.5 6EP-220 50-65 9-12 - 5-7 14-16

The resulting absorber is molded by g-cap in the way through spinnerets in worms 0 5 mm in length 10-20 mm and dried at 100-150 s.

The scavenger was tested according to the procedure described in TU6-03-31-24-77 for carbon disulfide carbon disulfide content, dynamic sulfur content, sulfur absorption before hydrogen sulfide residue penetration of 0.5 mg / nm, hydrogen sulphide absorption depth from gas (purity test amount of 120 cm - on industrial gas containing from 70 to 120 mg / nm of hydrogen sulfide and up to 10 mg / nm of organic sulfur compounds at 370 ° С, space velocity of 1500 and pressure of 20 atm.

On the absorber, in addition to absorbing hydrogen sulfide, the organic sulfur compounds are converted to hydrocarbons, and hydrogen sulfide, which is also absorbed by the absorber.

Comparative data from the results of testing absorber samples obtained by the proposed and known methods are presented in Table. 3

EXAMPLE 2 Catalyst samples are prepared in the same way as in Example 1, with the difference that the slurry is obtained by anodic dissolution of one of the titanium alloys, the grades and chemical compositions of which are given in Table. 2. The scavenger tests were carried out as in Example 1.

Comparative data from the test samples of the absorber obtained by the specimen and known methods are presented in Table. four.

The proposed method makes it possible to simplify the process by eliminating the coprecipitation of hydroxides from salt solutions and the operations of washing the mixture, increasing the sulfur content during saturation of the absorber with hydrogen sulfide, increasing the depth of absorption of hydrogen sulfide from gases, and ensuring the disposal of waste (sludge) from electrochemical production of engineering plants.

Table 1 I ACI Fe Si -2,41,40,50,3. 2 22- 0.5 5-8 2.2-2.9; 3.9-4.8 3 5 Grade of alloy BT3-1 BT5-1 BT-8 Indicators Sludge content in the absorber,% 1 3 10 1 3 10 1 ZnO content in the absorber,% 99 97 90 99 97 90 99 Ratio -, ZnOtAKP 1: 1 1: 3 1: 7 1: 7 1: 3 1: 1 1: 3 Concentration SOGV, AKP, G / L 180 80 50 50 80 180 80 80 Concentrator, qi NM in AKP, g / l 160 140 80 80 140 160 140 Amount of sludge introduced into AKP, g 16 15 22 2 15 160 5 Amount of 7 OO added to the mixture, g 1300 300 О О 300 1300 300 Absorber density, kg / l 1.3 1, 2 1.1 1.05 1.25 1.1 Specific surface area of the absorber, MVr 32 35 30 38 36 33 39 Alloy composition,% 1-g - g 1jTi j le Mo Cr Sn Fe Si 89.25 2 2 - 1 0,25 92,50 5,0 - - 2,5 - 89, 75 6,5 3,5 - - - 0,25 Absorbant obtained Absorb l, the proposed method is 7977416. Table 2 Table H by a well-known HEY-- 617 EP - 220 by the method 3 10 0,00, 97 90 76-80 1: 3 1: 3 7,7: 1 80 80 0,00 140 140 150-160 15 55 0.00 300 300 1.2 1.3 1.45-1.55 34 33

Continued tabl, 3

The sulfur content in graying the house,

% 31.5 37 33 32 36 34 32 37 35 28-0

Depth

absorption of hydrogen sulfide,

% 97.5 99 98.2 98 99 98.5 9J, 7 99.1 99 81-82

Degree of hydrogenation

organic sulfur

mid-

Gas Research Institute

% 90 94 95 91 93 94 91 94 95 87-88 Sludge content in the absorber,% 1 3 101 3 10 1 ZnO content in the absorber,% 99 97 90 99 97 90 99 ZnO: AKP ratio 1: 1 1: 3 1: 7 1: 7 1: 3 1: 1 1: 3 Concentration of COj in AKP, g / l 180 80 50 50 80 180 180 80 Concentration of NH-j in AKP, g / l 160 140 80 80 140 160 140

Table 4 3 10 0.00 97 90 76-80 1: 3 1: 3 7.7: 1 80 80 0.00 140 140 150-160 The amount of sludge introduced into the AKP, g 16 15 22 215 160 5 Number of ZttO, before- . bled into the mixture, g 1300 300 00 300 1300 300 Nasypna. toioTHOCTb is absorbed. , 4 1.3 1.2 1.15 1.25 1.4 1.1 Specific, ,, surface of the absorber, 33 35 30 37 35 34 32 Sulfur capacity at saturation. Sp, 5 35 31,32 36 34 31 Sulfur-holding capacity before breakthrough p% 20 25 23 21 24 - 22 21 Absorption depth of hydrogen sulfide,% 98 99.5 98.3 98.1 99 98.8 98

92 94 90 89

Claims (3)

Claim 1. A method of preparing an absorber for purifying gases from sulfur compounds, including treating zinc oxide with a slurry containing ammonium carbonate solution and metal compounds, drying, calcining and molding the resulting product, which distinguishes the Continuation tab. four 95 91 94 95 87-88 93 so that, in order to increase the absorber’s sulfur-absorption capacity and sorption capacity with respect to 4 (0 hydrogen sulfide, as well as, simplifying the process and reducing the cost of the process, the treatment is carried out with a suspension containing ammonium carbonate solution and slags obtained by anodic dissolution 65 heat resistant nickel and titanium ones „„ 5 55 0.00 00 300 1.3 1.35 1.45-1.655 34 31 36 33 28-30 26 24 99, 1 98.3 81-82 alloys, with a ratio of zinc oxide to suspension from 1: 1 to 1: 7. 2. The method according to p. 1, I differ u and so that the treatment is carried out with a suspension containing; 1-10 wt.% Sludge (in terms of the calcined product) at concentrations of carbon dioxide and ammonia in an ammonium carbonate solution of 50-180 g / l and 80-160 g / l, respectively. 797741 12 Sources of information taken into account in the examination 1. Cleaning of process gases, Ed. T.A., Semenova and I.L. Leites M., Himi, 1977, p. 291. 2.Danzig G.A. et al. Getting and active zinc oxide properties for gas cleaning processes for sulfur compounds. - Applied, mi, t. HIH, 5, 1976, p. 965. 3. USSR author's certificate  5,11099, cl. BO J 23/74, 25.04.76.