Composition for cleaning carbide acetylene from impurities

 

(57) Abstract:

Can be used for cleaning carbide acetylene from impurities. The composition contains chromic anhydride, a free sulfuric acid, potassium iodide, powdered alumina as a carrier in the following ratio, wt.%: chromic anhydride 11 - 13, free sulfuric acid 18 - 21, potassium iodide 0.001 to 0.01, powdered alumina 57 - 63, water the rest. The invention allows to improve the physico-mechanical properties of the composition. table 2.

The invention relates to the field of gas purification from impurities, such as carbide acetylene from phosphine and hydrogen sulfide, and can be used for purification of industrial gases from similar substances.

Known composition for the cleaning of gases from phosphine containing ferric chloride, potassium iodide, infusorial land and water /1/.

The disadvantage of this composition is relatively low volumetric rate of gas purification (up to 300 h-1).

Known composition for the cleaning of gases from phosphine containing ferric chloride, sulfuric acid salt of divalent copper, hydrate of sodium carbonate, oxide of mercury, infusorial land and water /2/.

The disadvantage of this composition javljaetsja) and high cost.

Known composition for the purification of acetylene from phosphine, representing a powdery infusorial earth, impregnated with chromic anhydride and sulfuric acid, with a water content up to 20 wt.% /2/.

The disadvantage of this structure is its high consumption in the cleaning process (average 270-300 g/DM3), due to the high moisture content (up to 20 wt.%), reducing activity.

Closest to the proposed invention to the technical essence and the achieved result is a catalytic mass, used for the purification of acetylene low pressure from phosphine containing, wt.%:

chromic anhydride - 11 - 13

free sulfuric acid - 16-18

potassium iodide - 0,01

infusino land 51-56

water - 13-22

cleansing activity in litres purified acetylene per gram of catalytic mass, DM3/g - 5,0-5,5 /3/

The disadvantage of this composition is also high moisture content (up to 22 wt.%), reducing its activity (in conditions of high humidity acetylene) and an acute shortage of infusorial land used as a carrier.

The purpose of the invention is the improvement of the cleansing activity of the composition, the increase in flow rate of gas purification and expansion of si is sulfuric acid, potassium iodide and water as the carrier contains powdered alumina in the following ratio, wt. %:

chromic anhydride - 11 -13

free sulphuric acid 18-21

potassium iodide - 0,001-0,01

powdered alumina - 57-63

water - the rest

cleansing activity in liters of purified acetylene per gram of composition, DM/g - 6,5-7,5

Alumina is characterized by a developed porous structure (pore volume is 0.8 g/m3the overwhelming radius of 500-1000 angstroms), high sorption properties, chemical resistance.

The use of powdered alumina as the carrier will improve the physical-mechanical properties of the composition, namely, to reduce caking and improve the stability during storage, during operation to reduce the hydraulic resistance, to increase the volumetric rate of gas purification up to 1400 h-1to increase the cleansing activity of up to 6,5-7,5 DM3/g compared with the prototype, where the cleansing activity is 5.0 to 5.5 DM3/,

Further, to reduce the moisture content to 14 wt.%, when increasing the service life of the treatment composition in 2-3 times depending on the content of phosphine and hydrogen sulphide in the source is seeking in compounds chromium trioxide (CzO3or bichromate of potassium (K2Cz2O7).

The contents Cz+6in the composition is within 11-13 wt.%. It is most active as an oxidizing agent in an acidic environment, so clean the mass of injected free sulfuric acid (H2SO4up to 21 wt.% and water to 14 wt. %.

To obtain 100 g of the composition in the laboratory undertakes 0.1 g of potassium iodide (Kl), 17 g of potassium bichromate (K2Cz2O7), 63 g of powdered alumina and loaded into the kneading machine. The mass of dry stirred for 30 minutes.

Then 11 cm3technical diluted with purified water 11 cm3H2SO4with a density of 1.84 g/cm3and pour in the mixture with constant stirring.

After adding the total amount of acid, the stirring is continued for one hour.

The resulting composition used in laboratory and industrial conditions on a real gas.

The scheme of installation, test conditions in the laboratory and the definition of the cleansing activity of the composition was carried out in accordance with the specifications 6-21 - 33-78, with var.1-5 /3/.

In the U-shaped tube was loaded 40 cm3the test composition.

Consumption is performed every 0.5 hour for the whole experience. The content of phosphine and hydrogen sulphide in the gas before and after treatment was determined by the method described in GOST 5457-75, with var. 1-3 /4/.

The impurity content in the carbide acetylene (vol.%) received:

1. The phosphine to clean 0,08-0,09, after cleaning 0.01 to 0.04 (norm of not more than 0.08);

2. Hydrogen sulfide to clean 0,1, after cleaning 0,005-0,01 (the norm is not more than 0.05).

In table. 1 shows the cleaning activity of the proposed structure.

Example 1. Prepare structure for cleaning carbide acetylene from phosphine and hydrogen sulphide containing, wt.%:

chromic anhydride - 13

free sulfuric acid - 21

powdered alumina - 63

water - 3

cleansing activity in liters of purified acetylene per gram of composition, DM3/g - 7,5

Examples 2-7. The compositions obtained by the above method, but with the specified table. 1 mixing ratio. Cleansing activity obtained in the range of 6.5-7.5 DM/year

Examples 8-10 (comparative). The compositions are obtained from neogranichennym ratio of the components. Cleansing activity of the composition obtained in the range of 1.5-6.3 DM3/,

As can be seen from the table. 1 proposed structure (examples 1-7) has a higher cleansing activity (6,5-7,5 DM3/g) UP>/g) due to sub-optimal content of components in the composition.

Industrial tests carried out on the technical acetylene obtained from calcium carbide in a stationary generators.

The test composition was consistent with the composition of example 1 (table. 1) with a purifying activity of 7.5 DM3/, In the process of testing controlled the content of phosphine and hydrogen sulphide in the carbide acetylene before and after cleaning.

The results of the tests obtained (table. 2) residue content in the gas (about. %): phosphine 0,02-0,05 (input 0,09), hydrogen sulfide 0,005-0,01 (input 0,1). The norm for phosphine is not more than 0.08, the hydrogen sulfide is not more than 0.05.

The proposed structure does not contain toxic compounds, has a high cleansing activity, at flow rate of cleaning 1400 h-1. Purified carbide acetylene meets the requirements of the state standard on the residual content of impurities in the form of phosphine and hydrogen sulphide. Significantly reduced costs in the preparation and operation of composition, due to the use of powdered alumina.

SOURCES OF INFORMATION

1. Author's certificate N 521916, CL 01 D 53/14, 1975

2. 'I. I. Technical basis and safely is m 1-5 "weight of the catalyst for purification of acetylene from hydrogen phosphide (prototype).

4. GOST 5457-75 with ISM.1-3 "Acetylene, dissolved and gaseous technical".

Composition for cleaning carbide acetylene from phosphine and hydrogen sulphide containing chromic anhydride, a free sulfuric acid, potassium iodide, media and water, characterized in that as the media it contains powdered alumina in the following ratio, wt.%:

Chromic anhydride - 11 - 13

Free sulfuric acid - 18 - 21

Potassium iodide - 0,001 - 0,01

Powdered alumina - 57 - 63

Water - The Rest

 

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