EP0223445A2
Expired / Lapsed
EP
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Refractory oxide shaped articles
Assignee: Imperial Chemical Industries Ltd
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Filing: 1986-10-27
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Granted: —
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Expires: 2006-10-27
Abstract
Abstract Shaped articles, especially ones containing a plurality of fine through passages, are made from a composition containing a refractory particulate material by extrusion, cutting into lengths while in the green deformable state by means of a high velocity water jet generator (8), and then calcining to bind the refractory particles together. Depending on the nature of the refractory material, the articles are of use as catalyst supports or precursors, adsorbents, or absorbents. In a preferred mode of operation, the extrudate is extruded horizontally and allowed to sag into a gap between the extrusion die and a transport device, which is driven positively to maintain the degree of sag within predetermined limits, and the frequency of cutting depends on the rate of movement of the transport device.
Inventors
- 👤 Peter John Davidson
- 👤 John Frank Davidson
- 👤 Frank Alfred Kirk
- 👤 Donald Leslie Ralph
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 14:14
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/20; B23; B23P; B23P13/00; B23P13/04; B26; B26F; B26F3/00; B26F3/004; B28; B28B; B28B11/00; B28B11/14; B28B11/16; B28B11/163; B28B11/166; B30; B30B; B30B11/00; B30B11/22; B30B11/227
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
76 words
A method of making refractory shaped articles comprising (a) extruding an extrudable composition containing a refractory particulate material through a die to give continuous, deformable, green extrudate; (b) cutting the extrudate, while still in the green, deformable, m state into lengths; and thereafter (c) calcining the cut lengths to remove any volatile material and to bind together the particulate material; characterised by using a high velocity water jet to effect the cutting of the green extrudate.
Claim 2
Independent Claim
76 words
A method of making refractory shaped articles comprising (a) extruding an extrudable composition containing a refractory particulate material through a die to give continuous, deformable, green extrudate; (b) cutting the extrudate, while still in the green, deformable, m state into lengths; and thereafter (c) calcining the cut lengths to remove any volatile material and to bind together the particulate material; characterised by using a high velocity water jet to effect the cutting of the green extrudate.
Claim 3
Dependent Claim
28 words
A method according to claim 1 wherein the extrudate has walls of thickness less than 2 mm and/or through passages of less than 2 mm cross section dimension.
Claim 4
Dependent Claim
22 words
A method according to claim 1 or claim 2 wherein the extrudate is suspended vertically and cut horizontally with the water jet.
Claim 5
Dependent Claim
31 words
A method according to claim 3 wherein the extrudate is extruded horizontally and then, while supported on a transport device, is turned through 90° to the vertical position prior to cutting.
Claim 6
Dependent Claim
23 words
A method according to claim 4 wherein the transport device is positively driven at a rate coupled to the actual rate of extrusion.
Claim 7
Dependent Claim
34 words
A method according to claim 4 or claim 5 wherein the extrudate is transported continuously and the water jet is moved in unison with the extrudate to effect a perpendicular cut through the extrudate.
Claim 8
Independent Claim
166 words
A method of making refractory shaped articles comprising (a) extruding an extrudable composition containing a particulate refractory material through a die to give a continuous, deformable, green extrudate; (b) cutting the extrudate, while still in the green, deformable state, into lengths; (c) calcining the cut lengths to remove any volatile material and to bind together the particulate material; characterised by (i) extruding the composition horizontally on to a driven transport device for receiving, supporting, and transporting the extrudate, disposed between the die and a station at which the cutting operation takes place, with a gap between the die and the transport device, the rate of extrusion being such that the extrudate sags into the gap; (ii) sensing the degree of sag of the extrudate into the gap and controlling the rate of movement of the transport device to maintain the degree of sag within predetermined limits; and (iii) cutting the extrudate at a frequency of operation depending on the rate of movement of the transport device.
Claim 9
Independent Claim
166 words
A method of making refractory shaped articles comprising (a) extruding an extrudable composition containing a particulate refractory material through a die to give a continuous, deformable, green extrudate; (b) cutting the extrudate, while still in the green, deformable state, into lengths; (c) calcining the cut lengths to remove any volatile material and to bind together the particulate material; characterised by (i) extruding the composition horizontally on to a driven transport device for receiving, supporting, and transporting the extrudate, disposed between the die and a station at which the cutting operation takes place, with a gap between the die and the transport device, the rate of extrusion being such that the extrudate sags into the gap; (ii) sensing the degree of sag of the extrudate into the gap and controlling the rate of movement of the transport device to maintain the degree of sag within predetermined limits; and (iii) cutting the extrudate at a frequency of operation depending on the rate of movement of the transport device.
Claim 10
Dependent Claim
31 words
A method according to claim 7 wherein the extrudate is extruded horizontally and then, while supported on the transport device, is turned through 90° to the vertical position prior to cutting.
Claim 11
Dependent Claim
33 words
A method according to claim 7 or claim 8 wherein the extrudate is transported continuously and the cutter is moved in unison with the extrudate to effect a perpendicular cut through the extrudate.
Claim 12
Independent Claim
22 words
A method according to any one of claims 7 to 9 wherein the cutting is effected with a high velocity water jet.
References Cited (Backward Citations)
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