Catalytic adsorbents obtained from municipal sludges, industrial sludges, compost and tobacco waste and process for their production
First Claim
1. A method of removing acidic gases from wet air streams comprising putting an adsorbent comprisinga) a waste material composition, comprising:
- one of compost or compost materials and sludge;
(1) wherein the compost is one of tobacco waste, waste paper, wood char or a combination thereof;
(2) wherein the sludge is at least one of waste oil, metal, or municipal sludge;
(ii) 20-30% porous organic carbon with incorporated organic nitrogen species; and
(iii) 70-80% inorganic matter;
b) adsorbent characteristics, wherein;
(i) the adsorbent is capable of adsorbing up to about 30% of the adsorbent'"'"'s weight in hydrogen sulfide;
(ii) a surface area of the adsorbent is 10-200 m2/g; and
(iii) the pH of the adsorbent is between 7-12;
in contact with the wet air stream and allowing the adsorbent to adsorb the acidic gases.
1 Assignment
0 Petitions
Accused Products
Abstract
Industrial waste derived adsorbents were obtained by pyrolysis of sewage sludge, metal sludge, waste oil sludge and tobacco waste in some combination. The materials were used as media to remove hydrogen sulfide at room temperature in the presence of moisture. The initial and exhausted adsorbents after the breakthrough tests were characterized using sorption of nitrogen, thermal analysis, XRD, ICP, and surface pH measurements. Mixing tobacco and sludges result in a strong synergy enhancing the catalytic properties of adsorbents. During pyrolysis new mineral phases are formed as a result of solid state reaction between the components of the sludges. High temperature of pyrolysis is beneficial for the adsorbents due to the enhanced activation of carbonaceous phase and chemical stabilization of inorganic phase. Samples obtained at low temperature are sensitive to water, which deactivates their catalytic centers.
-
Citations
11 Claims
-
1. A method of removing acidic gases from wet air streams comprising putting an adsorbent comprising
a) a waste material composition, comprising: -
one of compost or compost materials and sludge; (1) wherein the compost is one of tobacco waste, waste paper, wood char or a combination thereof; (2) wherein the sludge is at least one of waste oil, metal, or municipal sludge; (ii) 20-30% porous organic carbon with incorporated organic nitrogen species; and (iii) 70-80% inorganic matter; b) adsorbent characteristics, wherein; (i) the adsorbent is capable of adsorbing up to about 30% of the adsorbent'"'"'s weight in hydrogen sulfide; (ii) a surface area of the adsorbent is 10-200 m2/g; and (iii) the pH of the adsorbent is between 7-12; in contact with the wet air stream and allowing the adsorbent to adsorb the acidic gases. - View Dependent Claims (2, 3, 4)
-
-
5. A method of removing acidic gases from wet air streams comprising the steps of:
-
a) composting tobacco waste, waste paper, wood char or a combination thereof; b) thermally drying at least one of dewatered waste oil or metal sludge; c) mixing the dried sludge and the compost; d) pyrolyzing the mixture at temperatures between 600°
C. and 1100°
C., comprising the steps of;(i) heating the mixture between 5 and 10°
C./minute;(ii) holding the heated mixture between 60 and 90 minutes; and (e) forming an adsorbent, wherein; (i) the adsorbent is capable of adsorbing up to about 30% of the adsorbent'"'"'s weight in hydrogen sulfide; (ii) a surface area of the adsorbent is 10-200 m2/g; and (iii) the pH of the adsorbent is between 7-12; (f) putting said adsorbent in contact with the wet air stream; and (g) allowing the adsorbent to adsorb the acidic gases. - View Dependent Claims (6, 7, 8, 9, 10, 11)
-
Specification