Process for manufacturing white pigment containing products

Patent metadata

Field	Value
Publication number	US-11168218-B2
Application number	US-201715999446-A
Country	US
Kind code	B2
Filing date	Feb 13, 2017
Priority date	Feb 16, 2016
Publication date	Nov 9, 2021
Grant date	Nov 9, 2021

Abstract

A process is described for manufacturing white pigment containing products. The white pigment containing products are obtained from at least one white pigment and impurities containing material via froth flotation.

First claim

The invention claimed is:

1. A process for manufacturing white pigment containing products, the process comprising the following steps:
a) providing at least one white pigment and impurities containing material;
b) providing at least one collector agent is selected from the group consisting of compounds of formula (1):

wherein R 1 is selected from the group consisting of
i. a direct bond,
ii. a C 1 -C 20 , linear or branched, saturated or unsaturated hydrocarbon chain optionally substituted by one or more —OH group(s), one or more methyl and/or methylene groups, a cycloalkylene group, a cycloalkenylene group and/or an arylene group;

R 2 is selected from the group consisting of a hydrocarbyl group having from 8 to 24 carbon atoms or a group of formula R 4 —O-(A′O)w-T- wherein,
R 4 represents a hydrocarbyl group having from 8 to 24 carbon atoms;
w is a number within the range from 0 to 20;
A′O is an alkyleneoxy group having from 2 to 4 carbon atoms; and
T represents an alkylene group having from 1 to 6 carbon atoms;

R 3 is selected from the group consisting of a hydrocarbyl group or a benzyl group;
AO represents an alkyleneoxy group having from 2 to 4 carbon atoms;
X represents an anion derived from an alkylating agent R 3 X;
x is a number within the range from 1 to 20;
p is a number within the range from 1 to 15;
t is 0 or 1;
y is 0 or 1; and
G represents a group of formula (2);

wherein,
B represents an alkyl group having from 1 to 4 carbon atoms or represents a benzyl group;
s is 1, 2 or 3;
R 3 , X and t are as defined above;
N + in formula (2) is connected to R 2 in formula (1); and
(CH 2 ) s is connected to the quaternary nitrogen atom in formula (1);

c) mixing the at least one white pigment and impurities containing material of step a) and the at least one collector agent of step b) in an aqueous environment to form an aqueous suspension;
d) passing gas through the suspension formed in step c) to separate the white pigment from the impurities; and
e) recovering the white pigment containing product by removing the white pigment from the aqueous suspension obtained after step d).

2. The process according to claim 1 , wherein the process comprises performing an indirect flotation step that forms a froth containing the impurities and a white pigment bearing phase with the white pigment containing product.

3. The process according to claim 1 , wherein the white pigment is a white mineral pigment.

4. The process according to claim 1 , wherein the white mineral pigment is an alkaline earth metal carbonate.

5. The process according to claim 1 , wherein the white pigment containing material comprises impurities selected from the group consisting of iron sulphides, iron oxides, graphite, silicates and mixtures thereof.

6. The process according to claim 5 , wherein the silicate is selected from the group consisting of a quartz, a mica, an amphibolite, a feldspar, a clay mineral and mixtures thereof.

7. The process according to claim 5 , wherein the silicate is a white colored silicate selected from the group consisting of wollastonite, kaolin, kaolinitic clay, calcined kaolinitic clay, montmorillonite, talc, diatomaceous earth, sepiolite and mixtures thereof.

8. The process according to claim 1 , wherein the amount of white pigment in the white pigment and impurities containing material of step a) is from 0.1 to 99.9 wt.-%, based on the dry weight.

9. The process according to claim 1 , wherein the ratio of white pigment:impurities in the white pigment and impurities containing material of step a) is from 0.1:99.9 to 99.9:0.1, based on the dry weight.

10. The process according to claim 1 , wherein the white pigment and impurities containing material of step a) has a weight median grain diameter in the range of from 1 μm to 1,000 μm.

11. The process according to claim 1 , wherein in the compound of formula (1):
R 1 represents an alkylene radical having from 2 to 6 carbon atoms;
R 2 represents a hydrocarbyl group containing from 12 to 24 carbon atoms or a group of formula R 4 —O-(A′O) w -T- wherein,
R 4 represents a hydrocarbyl group having from 12 to 24 carbon atoms;
w is a number ranging from 0 to 10;
A′O represents an alkyleneoxy group having from 2 to 4 carbon atoms; and
T represents an alkylene group having from 1 to 4 carbon atoms;

R 3 represents an alkyl group having from 1 to 4 carbon atoms;
X represents halogen, sulphate or carbonate;
AO represents an alkyleneoxy group having from 2 to 4 carbon atoms;
x is a number within the range from 1 to 10; and
p is a number within the range from 1 to 10.

12. The process according to claim 1 , wherein the compound as provided in step b) is selected from the group consisting of compounds of formula (1a)

wherein AO, p, t, x, R 1 , R 2 , R 3 , and X are as defined in claim 1 .

13. The process according to claim 12 , wherein in the compound of formula (1a):
R 1 represents an alkylene radical having from 1 to 20;
R 2 represents a hydrocarbyl group having from 8 to 24 carbon atoms;
R 3 represents a hydrocarbyl group having from 1 to 4 carbon atoms;
AO is an alkyleneoxy group having from 2 to 4 carbon atoms;
X is an anion derived from an alkylating agent R 3 X;
x is a number within the range from 1 to 15;
p is a number within the range from 1 to 15; and
t is 0 or 1.

14. The process according to claim 12 , wherein in the compound of formula (1a):
R 1 is derived from a dicarboxylic acid, a dicarboxylic acid chloride, a diester of a dicarboxylic acid, an anhydride of a dicarboxylic acid; and/or
R 2 is derived from a fatty amine selected from the group consisting of 2-ethylhexylamine, 2-propylheptylamine, n-octylamine, n-decylamine, n-dodecylamine, (coco alkyl)-amine, (palm oil alkyl) amine, n-tetradecylamine, n-hexadecylamine, n-octadecylamine, oleylamine, (tallow alkyl)-amine, (hydrogenated tallow alkyl)-amine, (rape seed alkyl)-amine, (soya alkyl)-amine, erucyl amine, N-(n-decyl)-N-methyl-trimethylene-diamine, N-(n-dodecyl)-N-methyl-trimethylene-diamine, N-(coco alkyl)-N-methyl-trimethylene-diamine, N-(rape seed alkyl)-N-methyl-trimethylene-diamine, N-(soya alkyl)-N-methyl-trimethylene-diamine, N-(tallow alkyl)-N-methyl-trimethylene-diamine, N-(hydrogenated tallow alkyl)-N-methyl-trimethylene-diamine, N-(erucyl)-N-methyl-trimethylene-diamine, isotridecyloxypropylamine and mixtures thereof; and/or
R 3 is derived from an alkylating agent selected from the group consisting of dimethyl sulphate, diethyl sulphate, dimethyl carbonate, benzyl chloride, methyl bromide, methyl chloride, methyl iodide, and mixtures thereof.

15. The process according to claim 12 , wherein in the compound of formula (1a):
R 1 is derived from a compound selected from the group consisting of adipic acid, maleic anhydride, sebacic acid and glutaric acid;
R 2 is derived from a ethoxylated fatty amine selected from the group consisting of ethoxylated (C 16 -C 18 ) and C 18 -unsaturated alkylamine, ethoxylated (C 8 -C 16 ) and C 18 -unsaturated alkylamine, ethoxylated (coco alkyl)-amine, ethoxylated oleylamine, ethoxylated (tallo

Assignees

• Omya Int Ag

Inventors

• Sötemann Jörg
• Maier Jörg Andreas

Classifications

• C09C1/021 Primary

  Calcium carbonates · CPC title

• B03D2201/02

  Collectors · CPC title

• D21H17/00

  Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution · CPC title

• C01P2006/60

  Optical properties, e.g. expressed in CIELAB-values · CPC title

• C09C1/402

  Satin white, modifications thereof, e.g. carbonated or silicated; Calcium sulfoaluminates; Mixtures thereof, e.g. with calcium carbonate or kaolin · CPC title