Extrusion process for the preparation of alkali metal carbonate, bicarbonate and sesquicarbonate formulations using a dissolved functionalizing agent

Patent metadata

Field	Value
Publication number	US-2021214238-A1
Application number	US-201716093116-A
Country	US
Kind code	A1
Filing date	Apr 13, 2017
Priority date	Apr 13, 2016
Publication date	Jul 15, 2021
Grant date	—

Abstract

The present invention relates to a process for preparing a formulation comprising an alkali metal salt selected from the group consisting of alkali metal bicarbonate salts, alkali metal carbonate salts, alkali metal sesquicarbonate salts and combinations thereof, wherein said process comprises: (a) dissolving a functionalizing agent in a solvent; (b) mixing the alkali metal salt with the solution comprising the functionalizing agent that a paste-like composition is formed; (c) extruding the paste-like composition to obtain filaments or granules; (d) at least partially removing the solvent from the filaments or granules. The invention furthermore relates to a powder, filaments and granules obtainable from said process and to the use of the powder, filaments or granules in various applications such as in plastic foaming or in food and feed leavening compositions.

First claim

1 . A process for preparing a formulation comprising an alkali metal salt selected from the group consisting of alkali metal bicarbonate salts, alkali metal carbonate salts, alkali metal sesquicarbonate salts and combinations thereof, wherein said process comprises:
(a) dissolving a functionalizing agent in a solvent to obtain a solution comprising the functionalizing agent; (b) mixing the alkali metal salt with the solution comprising the functionalizing agent in a weight ratio so that a paste-like composition comprising the alkali metal salt and the functionalizing agent is formed; (c) extruding the paste-like composition to obtain a powder, filaments or granules comprising the solvent, the alkali metal salt and the functionalizing agent; and (d) at least partially removing the solvent from the powder, filaments or granules to obtain a powder, filaments or granules comprising the alkali metal salt and the functionalizing agent, wherein the functionalizing agent is a polymer selected from the group consisting of polyvinylalcohol (PVOH), a polyglycol, polyethylene glycol (PEG), a polysaccharide, polyacrylic acid (PAA), poly(acrylic acid-co-maleic acid), polyethylenimine, polyvinylpyrrolidone (PVP), N-(2-Hydroxypropyl) methacrylamide (HPMA), poly-galactomannane, and combinations thereof.

2 . The process of claim 1 , wherein the polymer is a polysaccharide selected from the group consisting of hydrolyzed starch, carboxymethylcellulose (CMC), arabic gum, carrageenan, guar gum, locust bean gum, xanthan gum, and combinations thereof.

3 . A process for preparing a formulation comprising an alkali metal salt selected from the group consisting of alkali metal bicarbonate salts, alkali metal carbonate salts, alkali metal sesquicarbonate salts and combinations thereof, wherein said process comprises:
(a) dissolving a functionalizing agent in a solvent to obtain a solution comprising the functionalizing agent; (b) mixing the alkali metal salt with the solution comprising the functionalizing agent in a weight ratio so that a paste-like composition comprising the alkali metal salt and the functionalizing agent is formed; (c) extruding the paste-like composition to obtain a powder, filaments or granules comprising the solvent, the alkali metal salt and the functionalizing agent; and (d) at least partially removing the solvent from the powder, filaments or granules to obtain a powder, filaments or granules comprising the alkali metal salt and the functionalizing agent, wherein the functionalizing agent is an amino-acid.

4 . The process of claim 3 , wherein the amino acid is selected from the group consisting of casein, gelatin, glycine, proline, hydroxyproline, glutamic acid, alanine, arginine, aspartic acid, lysine, pectin, serine, leucine, valine, phenylalanine, threonine, isoleucine, hydroxylysine, methionine, histidine, tyrosine, and combinations thereof.

5 . A process for preparing a formulation comprising an alkali metal salt selected from the group consisting of alkali metal bicarbonate salts, alkali metal carbonate salts, alkali metal sesquicarbonate salts and combinations thereof, wherein said process comprises:
(a) dissolving a functionalizing agent in a solvent to obtain a solution comprising the functionalizing agent; (b) mixing the alkali metal salt with the solution comprising the functionalizing agent in a weight ratio so that a paste-like composition comprising the alkali metal salt and the functionalizing agent is formed; (c) extruding the paste-like composition to obtain a powder, filaments or granules comprising the solvent, the alkali metal salt and the functionalizing agent; and (d) at least partially removing the solvent from the powder, filaments or granules to obtain a powder, filaments or granules comprising the alkali metal salt and the functionalizing agent, wherein the functionalizing agent is a water-soluble inorganic salt, with the proviso that the water-soluble inorganic salt is not sodium silicate.

6 . The process of claim 5 , wherein the water-soluble inorganic salt is selected from the group consisting of silicates, NaCl, KCl, MgCl 2 , sodium phosphate, borates, nitrates, nitrites, sulfates, sulfites and combinations thereof.

7 . The process of claim 1 , wherein the solvent is water.

8 . The process according to claim 1 , wherein the functionalizing agent is PVOH, wherein the solution comprising the functionalizing agent at step a) comprises 20 to 40 g of PVOH per 100 g of water, and wherein the mixing of the alkali metal salt particles with the solution of PVOH at step b) is at a weight ratio of at least 1/1 to at most 3/1 of alkali metal salt particles to the solution comprising the functionalizing agent.

9 . The process according to claim 1 , wherein the filaments or granules are further milled.

10 . A powder, granules or filaments comprising a functionalizing agent and an alkali metal salt selected from the group consisting of alkali metal bicarbonate salts, alkali metal carbonate salts, alkali metal sesquicarbonate salts and combinations thereof, obtainable by the process of claim 1 .

11 . The powder, granules or filaments of claim 10 comprising: at least 40% by weight of the alkali metal salt, and from 0.1% to 60% by weight of the functionalizing agent, and at most 49.9% by weight of water.

12 . The powder, granules or filaments of claim 11 comprising at least 50% by weight of the alkali metal salt.

13 . The powder, granules or filaments of claim 10 , wherein the alkali metal salt shows a dissolution time of at least 100 seconds, wherein the dissolution time is measured with a conductivity meter diving cell in a beaker stirred with 1 liter (1000 ml±1 g) deionized water at 25° C.±0.5° C. at a stirring speed is 350 rpm, wherein the geometry of the stirrer (4 vertical blades) is: height 11 mm, diameter 42 mm, wherein each blade measures 20 mm in length and 10 mm in height, wherein the beaker has a diameter of 100 mm, wherein the gap between the blades and the bottom of the beaker is 10 mm, wherein the conductivity meter is positioned at 40 mm of the stirrer axis and 20 mm under the liquid surface, wherein a 10 g±0.05 g sample of the powder, granules or filaments is introduced into the solution or suspension, and wherein the dissolution time is the time (starting with introduction of the sample into the solution) required to reach 95% of the maximum value of the conductivity during dissolution of the sample.

14 . The powder, granules or filaments of claim 10 , wherein the alkali metal salt is a bicarbonate or a sesquicarbonate salt and wherein the granules or filaments show a CO 2 release maximum temperature of at least 150° C., as determined by thermogravimetric analysis (TGA) of a 15 mg sample of the powder, granules or filaments, wherein heating is performed between 30° C. and 500° C. at a speed of 10° C./min.

15 . A method for making products in one or more applications selected from the group consisting of plastic industry, flue gas cleaning, pharmaceutical industry, cosmetics industry, detergence industry, food and feed industry, the method comprising using the powder, granules or filaments of claim 10 , as a flue gas cleaning agent, or as an ingredient in plastic compositions, in pharmaceutical compositions, in cosmetics compositions, in detergents, in food and feed leavening compositions, as a food and feed supplement additive or food and feed pH buffer.

16 . A powder, granules or filaments comprising a functionalizing agent and an alkali metal salt selected from the group consisting of alkali metal bicarbonate salts, alkali metal carbonate salts, a

Assignees

• Solvay

Inventors

• Kabbabe Malave Jorge Alejandro
• Detoisien Thibaud
• Cavalier Karine
• Dubois Eric Pierre

Classifications

• C11D3/222

  Natural or synthetic polysaccharides, e.g. cellulose, starch, gum, alginic acid or cyclodextrin · CPC title

• C11D3/37

  Polymers {(polymeric surface-active agents C11D1/008; polysaccharides C11D3/222)} · CPC title

• C11D3/10

  Carbonates {; Bicarbonates} · CPC title

• C11D11/00

  Special methods for preparing compositions containing mixtures of detergents · CPC title

• C08J3/03

  in aqueous media · CPC title