Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – With means applying electromagnetic wave energy or...
Reexamination Certificate
1998-06-30
2001-08-07
Tran, Hien (Department: 1764)
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
With means applying electromagnetic wave energy or...
C422S171000, C422S186000, C055S300000, C055S304000
Reexamination Certificate
active
06270732
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to an apparatus for collecting particles from a gas stream. In particular, the invention relates to an apparatus and associated method for the continuous collection and removal of particles from a gaseous flow. The apparatus can be used advantageously with a particle synthesis apparatus.
BACKGROUND OF THE INVENTION
Advances in a variety of fields have created a demand for a many types of new materials. In particular, a variety of chemical powders can be used in many different processing contexts. This demand for chemical powders has resulted in the development of sophisticated techniques for the production of these powders. Some of these techniques involve flow reactions that result in the formation of the powders in a gaseous stream. To commercially exploit these particle production processes on a practical scale, the processes must be capable of efficiently producing large quantities of particles in a reasonable period of time. These large quantities of particles must be harvested from the gaseous stream in which they are produced.
One approach for the removal of particles from a gaseous stream has been developed to remove dust and other contaminants for air purification. Generally, the particulate levels for air purification are very low. The materials removed from the dirty air are waste materials for disposal. These systems are designed for continuous operation for significant periods of time.
SUMMARY OF THE INVENTION
In one aspect, the invention features a particle production system including a particle synthesis apparatus and a particle collection apparatus. The particle synthesis apparatus includes a reaction chamber isolated from the ambient atmosphere, the reaction chamber having a reactant inlet for supplying reactant into the reaction chamber and a product outlet from which the product particles exit the reaction chamber. The particle collection apparatus includes a chamber, a filter and a particle removal system. The chamber has an inlet, a gas outlet, a particle drain and a constrained flow region separating the gas outlet from the inlet and from the particle drain. The filter is connected to the constrained flow region within the chamber such that the filter obstructs flow paths from the inlet to the gas outlet and such that particles dislodged from the filter flow to the particle drain. The particle removal applies forces to the filter to dislodge particles from the filter. The outlet of the particle synthesis apparatus is in fluid communication with the inlet of the particle collection apparatus.
In another aspect, the invention features a particle collection apparatus including a chamber, a filter and a particle removal system. The chamber has an inlet, a gas outlet, a particle drain and a constrained flow region separating the gas outlet from the inlet and from the particle drain. The chamber operates at a pressure less than about 700 Torr. The filter is connected to the constrained flow region within the chamber such that material within the filter obstructs flow paths from the inlet to the gas outlet and such that particles dislodged from the filter flow to the particle drain. The particle removal system applies forces to the filter to dislodge particles from the filter.
In a third aspect, the invention features a method of collecting particles from a gas stream using a collection chamber. The collection chamber includes a chamber, a filter within the chamber and a back pressure system. The back pressure system applies a gas pulse to the filter to dislodge particles from the filter. The method includes
establishing a pressure within the chamber at a value less than about 700 Torr;
flowing a gas stream with particles into the chamber such that the pressure within the chamber is maintained less than about 700 Torr; and
collecting particles removed from the gas stream.
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Bi Xiangxin
Gardner James T.
Phillips Samuel R.
Dardi Peter S.
NanoGram Corporation
Tran Hien
Westman Champlin & Kelly
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