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Precipitated silica

About: Precipitated silica is a research topic. Over the lifetime, 1401 publications have been published within this topic receiving 20992 citations.


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Patent
25 Jul 2010
TL;DR: In this article, a precipitated silica production process that includes a precipitation reaction between a silicate and an acid is described, in which the acid used in at least one of the steps of the process is a concentrated acid.
Abstract: A precipitated silica production process that includes a precipitation reaction between a silicate and an acid is described, in which the acid used in at least one of the steps of the process is a concentrated acid.

3 citations

Patent
27 Jul 2001
TL;DR: A method for preparing a masterbatch (M) based on a polymer and mineral particles, especially precipitated silica, by mixing a polymer dissolved in a solvent and the mineral particles suspended in an organic solvent is described in this article.
Abstract: A method for preparing a masterbatch (M) based on a polymer and mineral particles, especially precipitated silica, by mixing a polymer dissolved in a solvent and the mineral particles suspended in an organic solvent. Independent claims are also included for: (i) the mas natural rubber, polymers deriving from aliphatic or aromatic monomers, terbatch (M); (ii) use of masterbatch (M) in the vulcanization of rubber; (iii) articles containing masterbatch (M); and (iv) rubber vulcanized using masterbatch (M) especially when used in a tire.

3 citations

Patent
12 Jun 1991
TL;DR: In this paper, the pH of the waste liquor is lowered in two stages (3 and 3') by mixing in CO2, care being taken that no crystalline silica is yet formed or precipitated liquid is redissolved, and that no local overacidification takes place.
Abstract: of EP0431337In a desilication process, the pH of the waste liquor is lowered in two stages (3 and 3') by mixing in CO2, care being taken that no crystalline silica is yet formed or precipitated silica is redissolved, and that no local overacidification takes place. The silica is then precipitated by further lowering of the pH in a third, substantially identical reactor 3'' at pH = 10.2. The precipitated silica is discharged and, to allow the crystals to grow further, partially recycled. The discharged silica is washed and dehydrated in a filter press 12, the liquid separated off is partially evaporated and incinerated as waste liquor or fuel and partially recycled into the reactors to maintain the viscosity, whereby the foaming problem is also reduced.

3 citations

Patent
Scott Jackson1, Alain Pouchelon1
21 Nov 2001
TL;DR: In this article, a process for the preparation of a suspension of precipitated silica, treated with hexamethyldisilazane (HMDZ), in a crosslinkable silicone oil is described.
Abstract: The invention relates to the preparation of a suspension of precipitated silica in a silicone oil, this suspension being usable for the production of silicones crosslinkable by polyaddition or polycondensation (RTV elastomers). The object of the invention is to seek a compromise between on the one hand the cost and on the other hand the rheology and mechanical properties of the final RTVs. The invention achieves this object by providing a process for the preparation of a suspension of precipitated silica, treated with hexamethyldisilazane (HMDZ), in a crosslinkable silicone oil. This HMDZ is introduced in at least two fractions. The 1st fraction on the one hand corresponds to a proportion less than or equal to 15% by dry weight, based on the total amount of HMDZ, and on the other hand is first brought into contact with the precipitated silica and the water. The invention further relates to the production of a silicone elastomer composition from this suspension and to the composition thus obtained.

3 citations

Patent
21 Nov 2012
TL;DR: In this paper, a method for recycling silicon tetrachloride as a byproduct of polycrystalline silicon is presented, which is characterized by comprising the following process routes of: with megilp as a medium, preparing a mixed solution of a mixed mixture of silicon tectors and the megilps, and adding pure water in the mixed solution for carrying out hydrolysis reaction, wherein the volume value of the added pure water is 0.65 time of the volume of the silicon tectoride.
Abstract: The invention provides a method for recycling silicon tetrachloride as a by-product of polycrystalline silicon, which is characterized by comprising the following process routes of: with megilp as a medium, preparing a mixed solution of silicon tetrachloride and the megilp, wherein the volume value of the silicon tetrachloride is the same as that of the megilp; adding pure water in the mixed solution for carrying out hydrolysis reaction, wherein the volume value of the added pure water is 0.65 time of the volume value of the silicon tetrachloride; absorbing the hydrogen chloride gas produced in the reaction by using pure water so as to obtain hydrochloric acid; performing solid-liquid separation to the white colloidal sediment produced in the reaction and the megilp, wherein the obtained white colloid is metasilicic acid, the separated residual liquid is the megilp which can be recycled; and drying the metasilicic acid to obtain precipitated silica. The invention realizes that the silicon tetrachloride as the by-product of polycrystalline silicon is recycled, and has no three wastes in the process, belongs to clean production, and has notable environmental benefit; in addition, the obtained recycled products have high purity, high added value, and good economic benefit, therefore the method is suitable for industrial implementation.

3 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20236
202217
202118
202030
201931
201841