SU806084A1 - Somposition for cleaning gases - Google Patents

Description

The invention relates to compositions used for the purification of gases from phosphine, for example, carbide acetylene, gases of phosphorus production. A composition for purification of gases, such as acetylene from phosphine and sulfane, containing chromic anhydride, sulfuric acid, infusorial earth and water, is known in the following ratios of components, wt.%: Chromic anhydride. The lack of composition - small volumetric gas cleaning rate (up to 1200) and high specific mass consumption (320 g / m), which leads to incomplete purification of acetylene from impurities of phosphine. The closest in technical essence to the present invention is a gas cleaning composition (for example, acetylene from phosphine) containing chromic anhydride, sulfuric acid, potassium iodide, infusorial soil and water in the following ratio of components, wt.%: Chromic anhydride 11 - 13 Serna acid 16 - 18 Potassium iodide 0.0001 - 0.01 Infusorna, soil 50 - 60 Water Remaining 2. Lack of composition - high specific mass consumption (192-157 g / m) and relatively high content of chromic anhydride in the waste mass (3.0 weight. %). The purpose of the invention is to increase the amount of purified gas and reduce the consumption of the cleaning mass. The goal is achieved by the fact that the composition, including chromic anhydride, sulfuric acid, potassium iodide, infusorial earth and water, contains the indicated components in the following ratio, wt.%: Chromic anhydride3.6 - 6.0 Sulfuric acid3.5 - 10.5 Potassium iodide 0.001 - 0.01 Water.10-30 Infusorna Earth Else. The composition has increased activity, for example, the amount of carbide acetylene, which is more than 1 kg of mass, increases to 8.5-11. When using the proposed composition, the specific consumption of the cleaning mass is reduced by 1.3-1.7 times. The purified gas, such as acetylene, contains phosphine less than 0.01 vol.% And corresponds to acetylene with a quality mark according to GOST 5457-75. The content of chromic anhydride in the waste mass is reduced to 0.1 - 1.5 wt.%, Which reduces the toxicity of the spent cleaning mass.

The preparation of the composition is carried out by adding an aqueous solution of the nodes. potassium and concentrated sulfuric acid to measure infusorial earth with sodium bichromate at room temperature.

Example .40 g of cleansing mass, containing, wt.%:

Chromic anhydride6.0

Sulfuric acid6.0

Potassium iodide 0.01

Water20

Infusorna Earth Else

placed in a glass tube through which raw carbide acetylene, containing phosphorus impurities in the range of 0.04-0.09 vol. The amount of purified acetylene is 420 l, the specific mass consumption is 95 g / m, the concentration of phosphine in the purified gas is less than 0.01 vol.%, And the content of chromic anhydride in the waste mass is 1.5 wt.%.

In tab. 1 shows examples of formulations,. in tab. 2 - their indicators.

Table 1

Composition, wt.%

Comonents

--- T --- T- (known) II

Chrome eng. Sulfuric acid Potassium iodide Water Infusorna earth

Claims (2)

1. Strizhevsky I.I. Technological OSHOBta and safety of production of gaseous and dissolved acetylene. Chemistry, 1968, p. 72-74. 2. USSR Author's Certificate No. 5% 274, cl. B 01 D 53/16, 12.08,75.