Twisted Polylobed Extrudates and Process for Their Manufacture

Patent metadata

Field	Value
Publication number	US-2016228861-A1
Application number	US-201514978095-A
Country	US
Kind code	A1
Filing date	Dec 22, 2015
Priority date	Feb 2, 2015
Publication date	Aug 11, 2016
Grant date	—

Abstract

The invention relates to moderately twisted polylobed extrudates having improved crush strength. The moderately twisted polylobed extrudates have an oblong shape and a cross section comprising a plurality of lobes, which lobes extend along and are twisted around a longitudinal axis of the extrudate and wherein the twist has a pitch from about 0.5 turns/inch (0.5 turns per 2.54 cm) to about 2 turns/inch (2 turns per 2.54 cm). Further the invention relates to a method for manufacturing such moderately twisted polylobed extrudates and their use as catalysts or adsorbents.

First claim

1 . A twisted polylobed extrudate having an oblong shape and a cross section comprising a plurality of lobes, which lobes extend along and are twisted around a longitudinal axis of the extrudate and wherein the twisted lobes have a pitch from about 0.5 turns/inch (0.5 turns per 2.54 cm) to about 2 turns/inch (2 turns per 2.54 cm).

2 . The twisted polylobed extrudate of claim 1 , wherein the pitch is at least 0.5 turns/inch (0.5 turns per 2.54 cm) and less than about 2 turns/inch (2 turns per 2.54 cm).

3 . The twisted polylobed extrudate of claim 1 , wherein the pitch is at least 0.7 turns/inch (0.7 turns per 2.54 cm) and no more than 1.6 turns/inch (1.6 turns per 2.54 cm).

4 . The twisted polylobed extrudate of claim 1 , wherein an extruded length of the extrudate is greater than about 2 inch (5.08 cm).

5 . The twisted polylobed extrudate of claim 1 , wherein a diameter of the extrudate is from about 1/30 inch (0.8 mm) to about ⅛ inch (3.2 mm).

6 . The twisted polylobed extrudate of claim 1 , wherein the diameter of the extrudate is from about 1/20 inch (1.3 mm) to about 1/16 inch (1.6 mm).

7 . The twisted polylobed extrudate of claim 1 , wherein the cross section comprises three lobes.

8 . The twisted polylobed extrudate of claim 1 , wherein the cross section comprises four lobes.

9 . The twisted polylobed extrudate of claim 1 , wherein the extrudate comprises at least one of a zeolite or a mesoporous material, a binder and, optionally, a promoter.

10 . A catalyst shaped as a twisted polylobed extrudate according to claim 1 .

11 . A method for manufacturing twisted polylobed extrudates comprising:
a. mulling an extrusion mixture with a liquid to form a paste; b. adding the mulled extrusion mixture (paste) to an extruder, the extruder having a die plate comprising one or more dies, each die having a plurality of apertures; c. extruding the paste through the plurality of apertures to form twisted polylobed extrudates,
wherein the apertures are configured to form extrudates having an oblong shape and a cross section comprising a plurality of lobes, which lobes extend along and are twisted around a longitudinal axis of the extrudate and wherein the twisted lobes have a pitch from about 0.5 turns/inch (0.5 turns per 2.54 cm) to about 2 turns/inch (2 turns per 2.54 cm).

12 . The method of claim 11 , wherein the pitch is at least 0.5 turns/inch (0.5 turns per 2.54 cm) and less than about 2 turns/inch (2 turns per 2.54 cm).

13 . The method of claim 11 , wherein the pitch is at least 0.7 turns/inch (0.7 turns per 2.54 cm) and no more than 1.6 turns/inch (1.6 turns per 2.54 cm).

14 . The method of claim 11 , wherein a diameter of the apertures is from about 1/30 inch (0.8 mm) to about ⅛ inch (3.2 mm).

15 . The method of claim 11 , wherein the twisted polylobed extrudates formed at step (c) have an extruded length greater than about 2 inch (5.08 cm).

16 . The method of claim 11 , wherein the twisted polylobed extrudates comprise at least one of a zeolite or a mesoporous material, a binder and, optionally, a promoter.

17 . Use of the twisted polylobed extrudate of claim 1 as a catalyst.

18 . Use of the twisted polylobed extrudate of claim 1 as an adsorbent.

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Lai Wenyih F
• Beeckman Jean W
• Datz Theodore E
• Fassbender Natalie A

Classifications

• B01J35/37

  Crush or impact strength · CPC title

• B01J37/0009

  Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst · CPC title

• B01J20/18

  Synthetic zeolitic molecular sieves · CPC title

• B01J29/703 Primary

  MRE-type, e.g. ZSM-48 · CPC title

• B01J20/3007

  Moulding, shaping or extruding · CPC title