Catalytic adsorbents obtained from municipal sludges, industrial sludges, compost and tobacco waste and process for their production
First Claim
1. An adsorbent formed by drying waste materials, wherein the improvement comprising:
- a) a waste material composition, comprising;
(i) 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.
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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.
18 Citations
9 Claims
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1. An adsorbent formed by drying waste materials, wherein the improvement comprising:
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a) a waste material composition, comprising; (i) 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. - View Dependent Claims (2, 3, 4, 5)
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6. A method of making an adsorbent which comprises the steps of:
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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. - View Dependent Claims (7, 8)
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9. A method for producing an adsorbent, comprising the steps of:
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(a) combining at least one of a waste oil or metal sludge and a compost material comprising at least one of tobacco waste, waste paper and wood char, or a combination thereof, to form a mixture; (b) thermally drying the mixture; (c) pyrolyzing the mixture at a temperature between about 600°
C. and 1,100°
C.; and(d) forming at least one of wurtzite, ferroan, chalcocite, spinel, feroxyhite, bornite, hibonite, zincite, ankerite, pyrope, perrohotite, chalocopyrite, triolite, fersilicite, sapphirine, maghemite, cohenite, lawsonite, smithsonite, sphalerite, goethite, huntite, anorthite, diaspore, vaterite, lepidirocite, bayerite, moghemite, pyrohotite, hematite, and almandine during the pyrolyzing step.
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Specification