Catalytic adsorbents obtained from municipal sludges, industrial sludges, compost and tobacco waste and a rotary drying process for their production

• US 8,937,032 B2
• Filed: 05/08/2012
• Issued: 01/20/2015
• Est. Priority Date: 09/08/2005
• Status: Active Grant

• Current Assignee: City College of New York
• Original Assignee: City College of New York
• Inventors: Bandosz, Teresa J.
• Primary Examiner(s): HENDRICKSON, STUART L
• Application Number:
  US13/467,027
• Publication Number:
  US 20130123099A1
• Time in Patent Office: 987 Days
• Field of Search: 502/436
• US Class Current: 502/436
• CPC Class Codes: B01D 2253/102 Carbon
• CPC Class Codes: B01D 2253/104 Alumina
• CPC Class Codes: B01D 2253/112 Metals or metal compounds not provided for in B01D2253/104 or B01D2253/106
• CPC Class Codes: B01D 2253/308 Pore size
• CPC Class Codes: B01D 2253/311 Porosity, e.g. pore volume
• CPC Class Codes: B01D 2257/302 Sulfur oxides
• CPC Class Codes: B01D 2257/304 Hydrogen sulfide
• CPC Class Codes: B01D 2257/408 Cyanides, e.g. hydrogen cyanide (HCH)
• CPC Class Codes: B01D 2259/40088 by heating
• CPC Class Codes: B01D 53/02 by adsorption, e.g. preparative gas chromatography solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01
• CPC Class Codes: B01D 53/04 with stationary adsorbents B01D53/025 takes precedence
• CPC Class Codes: B01D 53/508 by treating the gases with solids
• CPC Class Codes: B01D 53/52 Hydrogen sulfide
• CPC Class Codes: B01D 53/54 Nitrogen compounds
• CPC Class Codes: B01D 53/565 by treating the gases with solids
• CPC Class Codes: B01J 20/20 comprising free carbon; comprising carbon obtained by carbonising processes
• CPC Class Codes: B01J 20/28057 Surface area, e.g. B.E.T specific surface area
• CPC Class Codes: B01J 20/28061 being in the range 100-500 m2/g
• CPC Class Codes: B01J 20/3078 Thermal treatment, e.g. calcining or pyrolizing
• CPC Class Codes: B01J 21/18 Carbon
• CPC Class Codes: B01J 2220/4887 : Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes

Abstract

A method for producing an adsorbent, having the steps of combining a first sludge and a second material to form a mixture, thermally drying the mixture, and pyrolizing the mixture using at least four temperature zones wherein each temperature zone is set between about 600° C. and 1,100° C. The first sludge is a municipal sludge or an industrial sludge, and the second material is a compost material or one of municipal sludge or industrial sludge differing from the first sludge. The compost material is at least one of tobacco waste, waste paper and wood char, or a combination thereof. Further, the drying can happen in two stages. Each stage can include two separate temperatures.

Claims

1. A method for producing an adsorbent, comprising the steps of:

combining a first sludge and a second material to form a mixture;

thermally drying the mixture; and

pyrolizing the mixture using at least four temperature zones to form the absorbent,

wherein each temperature zone is set between about 600°

C. and 1,100°

C.,

wherein at least one temperature zone is set to at least one of about 800°

C., about 900°

C., and about 1000°

C.,

wherein the first sludge is a municipal sludge or an industrial sludge, and

wherein the second material is a compost or one of municipal sludge or industrial sludge differing from the first sludge.

2. The method of claim 1, wherein the pyrolizing step further comprises the steps of:

setting a first temperature zone to about 600°

C.;

setting a second temperature zone to about 800°

C.;

setting a third temperature zone to about 900°

C.; and

setting a fourth temperature zone to about 1000°

C.

3. The method of claim 1, wherein the drying step further comprises the steps of:

drying the mixture in a first temperature; and

drying the mixture in a second temperature.

4. The method of claim 3, wherein the drying step further comprises the steps of:

setting the first temperature to about 385°

C.; and

setting the second temperature to about 230°

C.

5. The method of claim 1, wherein the drying step further comprises the steps of:

drying the mixture in a first stage; and

drying the mixture in a second stage.

9. The method of claim 1, wherein the compost material is at least one of tobacco waste, waste paper and wood char, or a combination thereof, and

wherein the first sludge is industrial sludge.

10. The method of claim 1, wherein the first sludge is industrial sludge, and

wherein the second material is municipal sludge.

6. A method for producing an adsorbent, comprising the steps of:

combining a first sludge and a second material to form a mixture;

thermally drying the mixture, comprising the steps of;

setting a first stage initial temperature;

setting a first stage ending temperature;

drying the mixture in a first stage;

setting a second stage initial temperature;

setting a second stage ending temperature; and

drying the mixture in a second stage; and

pyrolizing the mixture using at least four temperature zones,

wherein the first stage initial temperature is greater than the first stage ending temperature; and

wherein the second stage initial temperature is greater than the second stage ending temperature.

7. The method of claim 6, wherein the first stage initial temperature is not equal to the second stage initial temperature;

and

wherein the first stage ending temperature is not equal to the second stage ending temperature.

8. The method of claim 7, wherein the first stage initial temperature is about 370°

C.;

wherein the first stage ending temperature is about 230°

C.;

wherein the second stage initial temperature is about 390°

C.; and

wherein the second stage ending temperature is about 200°

C.