Aqueous miscible organic-layered double hydroxide

Patent metadata

Field	Value
Publication number	US-11111154-B2
Application number	US-201816054324-A
Country	US
Kind code	B2
Filing date	Aug 3, 2018
Priority date	Sep 28, 2012
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

The present invention relates to a process for modifying a layered double hydroxide (LDH), the process comprising,a. providing a water-wet layered double hydroxide of formula:[Mz+1-xM′y+x]a+(Xn−)a/r.bH2O   (1)wherein M and M′ are metal cations, z=1 or 2; y=3 or 4, x is 0.1 to 1, preferably x<1, more preferably x=0.1-0.9, b is greater than 0 to 10, X is an anion, r is 1 to 3, n is the charge on the anion X and a is determined by x, y and z, preferably a=z(1-x)+xy-2;b. maintaining the layered double hydroxide water-wet, andc. contacting the water-wet layered double hydroxide with at least one solvent, the solvent being miscible with water and preferably having a solvent polarity (P′) in the range 3.8 to 9,as well as to a layered double hydroxide prepared according to that process.

First claim

What is claimed is:

1. A layered double hydroxide of the formula:
[M z+ 1-x M′ y+ x (OH) 2 ] a+ (X n− ) a/r ●bH 2 O●c(Y)

wherein M and M′ are metal cations, z=1 or 2; y=3 or 4, x is 0.1 to 1, b is 0 to 10, X is an anion, r is 1 to 3, n is the charge on the anion X, a=z(1-x)+xy-2, c is greater than 0 to 10, and Y is an aqueous miscible organic solvent; and
wherein the layered double hydroxide exhibits a BET pore volume (N 2 ) of at least 1 cm 3 /g and one or more of:
a specific surface area greater than 150 m 2 /g;
a loose bulk density of less than 0.28 g/mL;
a tap density of 0.35 g/mL;
a first minima of a derivative of weight loss as a function of temperature in a thermogravimetric analysis that is 150° C. to 191° C.; or
a second minima of a derivative of weight loss as a function of temperature in a thermogravimetric analysis that is 340° C. to 392° C.

2. The layered double hydroxide of claim 1 , wherein the layered doubled hydroxide exhibits one or more of a specific surface area (N 2 ) of greater than 155 m 2 /g, a de-aggregation factor greater than 2, or an apparent density of 0.8 g/cm 3 or lower.

3. The layered double hydroxide of claim 1 , wherein the loose bulk density is 0.1 g/mL to 0.18 g/mL.

4. The layered double hydroxide of claim 1 , wherein the specific surface area is 155 m 2 /g to 301 m 2 /g.

5. The layered double hydroxide of claim 1 , wherein the BET pore volume 1 cm 3 /g to 3 cm 3 /g.

6. The layered double hydroxide of claim 1 , wherein the tap density is 0.1 g/mL to 0.35 g/mL.

7. The layered double hydroxide of claim 1 , wherein the first minima is less than 165° C. and the second minima is less than 390° C.

Assignees

• Scg Chemicals Co Ltd

Inventors

• O'Hare Dermot
• Wang Qiang

Classifications

• C01F7/784

  Layered double hydroxide, e.g. comprising nitrate, sulfate or carbonate ions as intercalating anions · CPC title

• C01G49/009 Primary

  Compounds containing iron, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01F7/785

  Hydrotalcite · CPC title

• C01F7/786

  containing, besides aluminium, only anions, e.g. Al[OH]xCly[SO4]z (mixed halides C01F7/48) · CPC title

• C01B35/12

  Borates {(C01B35/1063 takes precedence)} · CPC title