SU1161157A1 - Method of cleaning gases from mercury - Google Patents

Abstract

1. A method for purifying gases from mercury by passing activated carbon through mercury, characterized in that, in order to increase the degree of purification, activated carbon is used that additionally contains 0.5-4.0 wt.% Of vinyl chloride apigomers. 2. The method according to p. 1, about t l and h ay u and with the fact that they use mercury-containing activated carbon with 1-10 wt.% Mercury. (L

Description

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The invention relates to a method for purifying gases from mercury and can be used in metallurgical and chemical industries.

The purpose of the invention is to increase the degree of purification of gases from mercury.

Example 1. For the purification of gases from mercury, activated charcoal of the AR grade is used, treated with a 10% aqueous solution of mercuric chloride at 50 ° C, and then (after drying at room temperature) with vapors of hydrogen chloride and acetylene at 120 ° C.

Test samples of activated carbon with approximately equal mercury content and different content of vinyl chloride oligomers: 2.9, 0.5, and 4.0; 0.3; 4.5 wt.% (Samples 1-5 in Table 1) are placed in columns with a diameter of 19 mm and a height of 250 mm. Gas containing mercury vapor in the amount of 9 mg / nm1 is passed through the columns. Gas purification from mercury vapor is carried out before the breakthrough of mercury, characterized by a content of 0.2 mg / nm. adsorption gas cleaning are given in table.

Upon completion of the adsorption stage, the mercury contained in the spent activated carbon is transferred to the gas phase, for which flue gases with a temperature are passed through it

57. 2 1000 ° C. Gas consumption 130 activated carbon.

Then, mercury is condensed from the gas phase by passing gases through a water-cooled condenser. After condensation, the mercury content in the gas phase is 52–57 mg / nm. The output of metallic mercury, given in table. 1, characterizes the total efficiency of the processes of mercury adsorption, its sublimation into the gas phase and condensation,

Example2. Similar to Example 1, except for the content of mercury and vinyl chloride oligomers in the activated carbon used.

Data on the adsorption capacity of coal and the release of metallic mercury are given in Table. 2 (samples. 7-11),

The gas is passed through a column filled with spent catalyst for the synthesis of vinyl chloride, which is an activated carbon containing metallic mercury and its compounds, mercuric chloride and calomel, as well as oligomers of vinyl chloride. The effectiveness of the spent catalyst as a mercury sorbent is characterized by sample 12 in table. 2.. .

Thus, a spent vinyl chloride synthesis catalyst can also be used to remove mercury from gases.

Table 1

1.9 2.0 1.8 2.0 1.7

11р (ЛЧ) 2, 1

Ttni

89,8

6.0 84.2 3.1 83.2 3.0 74.8

1.2 71.2 1.1

70.2

0.6

table 2

Claims (2)

1. METHOD FOR CLEANING GASES FROM MERCURY by passing through mercury-containing activated carbon, excluding the fact that, in order to increase the degree of purification, activated carbon is used, containing an additional 0.5-4.0 wt. % vinyl chloride oligomers. 2. The method according to claim 1, with the fact that they use mercury-containing activated carbon from May 1-10.% Of mercury.