Vessel with filter and method of use
View Patent ↗Chemical processing apparatuses which incorporate a process vessel, such as a crucible or retort, and which include a gas separation or filtration system. Various embodiments incorporate such features as loose filtration material, semi-rigid filtration material, and structured filtration material. The vessel may include material that is a microwave susceptor. Filtration media may be selected so that if it inadvertently mixes with the chemical process or the reaction products of such process, it would not adversely affect the results of the chemical process.
1. An apparatus for chemical processes comprising:
a vessel having a wall extending upward from a base with a lip which defines an opening;
a cover placed over the opening, the cover having a lateral flange, where the position and dimensions of the cover are of sufficient extent in all lateral directions so that at least the lateral flange substantially overlaps the opening; and
loose filtration material disposed between the lip of the vessel and the lateral flange.
2. The apparatus of claim 1 in which:
the lip of the vessel has a circumferential groove;
the cover has a rim which extends downward from the lateral flange and which at least partially fits into the groove; and
the loose filtration material is disposed between the groove and the rim.
3. The apparatus of claim 1 in which:
the vessel is comprised of material that is a susceptor of microwaves.
4. The apparatus of claim 1 in which:
the vessel and the cover are comprised of material that is a susceptor of microwaves.
5. The apparatus of claim 1 in which
the loose filtration material comprises granular material selected from the group consisting of a periodic table Group 2 oxide, silica, carbon, alumina, cellulose, and metal.
6. An apparatus for chemical processes comprising:
loose filtration material dispersed on a horizontal surface;
a first vessel with its base placed on the loose filtration material and having an opening above the surface of the loose filtration material; and
a second inverted vessel having a base and a wall extending downward from the base of the second vessel in its inverted position with the wall having a lip which defines an opening and where the lateral dimensions of the wall are sufficient in all lateral dimensions to fit over the first vessel, where the combination of the height of the loose filtration material and the length of the wall of the second inverted vessel are sufficient such that substantially all of the circumferential segments of the edge of the lip of the inverted second vessel rest on the loose filtration material.
7. The apparatus of claim 6 in which:
the first vessel is comprised of material that is a susceptor of microwaves.
8. The apparatus of claim 6 in which:
the first vessel is comprised of material that is a susceptor of microwaves, and
the second vessel is comprised of material that is essentially transparent to microwaves.
9. The apparatus of claim 6 in which
the loose filtration material comprises granular material selected from the group consisting of a periodic table Group 2 oxide, silica, carbon, alumina, cellulose, and metal.
10. An apparatus for chemical processes comprising:
a vessel, where the vessel is comprised of material that is a susceptor of microwaves and where the vessel has a lip which defines an opening;
a cover placed over the opening, the cover having a lateral flange, where the position and lateral dimensions of the lateral flange are of sufficient extent in all lateral directions to substantially overlap the opening;
filtration media disposed between the lip and the lateral flange; and
bonding material applied between the filtration media and the lip.
11. The apparatus of claim 10 in which the cover is a comprised of material that is a susceptor of microwaves.
12. The apparatus of claim 10 further comprising:
bonding material applied between the filtration media and the cover.
13. The apparatus of claim 10 in which
the filtration media comprises structured filtration material selected from the group consisting of a periodic table Group 2 oxide, silica, carbon, alumina, cellulose, and metal.
14. An apparatus for chemical processing comprising:
a container having a port defined by a cutout edge; and
a filter medium having average particle sizes less than 45 microns disposed across the port to form an orifice passageway, whereby except for the orifice passageway the container provides a substantially leak-tight environment for a charge.
15. The apparatus of claim 14 wherein:
the container further comprises a vessel having a wall extending upward from a base with a lip which defines an opening, and a cover placed over the opening, where the lateral dimensions of the cover are of sufficient extent in all lateral directions to substantially fill the opening in the vessel and where bonding material substantially seals the cover with the lip.
16. The apparatus of claim 14 in which:
the container is comprised of material that is a susceptor of microwaves.
17. An apparatus for chemical processing comprising:
a container comprised of a material that is a susceptor of microwaves and where the container has at least one orifice passageway; and
semi-rigid filtration material comprised of a chemically stable filter medium disposed across the orifice passageway.
18. A method for chemical processing comprising:
placing a charge in a container which, except for at least one orifice passageway, provides a substantially gas-tight environment and where the orifice passageway is substantially filled with filtration media and where the container is comprised of material that is a susceptor of microwaves;
surrounding the container with a thermal insulating casket that is transparent to microwaves; and
exposing the charge, container, and casket to microwaves at least until a desired chemical reaction in the charge occurs.