摘要:
The invention provides a method for the processing of finely divided solids during the production of chlorosilanes, which is characterized in that the finely divided solids are hydraulically pressed to give bodies of increased density. Moreover, also provided is the compact obtained by the process according to the invention which is characterized by a filling factor of the finely divided solids to be hydraulically pressed of 3.9 to 4.5.
摘要:
The invention relates to a method for reducing the content of boron-containing compounds in compositions I comprising at least one silicon halide, especially of chlorosilanes of the type HnSiCI4-n with n being equal to 0, 1, 2 or 3, by introducing a small amount of moisture into the composition I in a first step and separating the hydrolyzed boron- and/or silicon-containing compounds in a second step in such a way that a pre-purified composition II having a reduced boron content is obtained, wherein, in particular, the first and second steps can be run in at least one or more cycles. Also claimed is an apparatus for performing the method and an overall system into which this apparatus is integrated.
摘要:
An aminofunctional organoalkoxysilane of formula I R2N—(CH2)y—Si(OR1)3−nR2n (I), wherein the R groups bonded to nitrogen are identical or different and each individual R group is hydrogen, an alkyl radical having from 1 to 4 carbon atoms, an aryl radical or an arylalkyl radical, R1 is an alkyl radical having from 1 to 8 carbon atoms or an aryl radical, R2 is an alkyl radical having from 1 to 8 carbon atoms or an aryl radical, y is 2, 3 or 4 and n is 0, 1 or 2, is prepared by a process comprising: reacting a chlorofunctional organoalkoxysilane of formula II Cl—(CH2)y—Si(OR1)3−nR2n (II), wherein R1, R2, y and n are as defined above, with ammonia or an organic amine of formula III HNR2 (III), wherein the two R groups are identical or different and each is defined as described above; separating organic amine hydrochloride or ammonium chloride by-product which is formed in the reaction; distilling the resulting crude product, thereby preparing an aminofunctional organoalkoxysilane or the product fraction of an aminofunctional organoalkoxysilane; and treating the aminofunctional organoalkoxysilane or the product fraction of an aminofunctional organoalkoxysilane with an alcohol.
摘要:
Alkoxysilanes are prepared by a process, comprising: (i) reacting a chlorosilane with an alcohol in a water-free and solvent free phase with removal of the liberated hydrogen chloride; (ii) transferring the resultant product mixture into a liquid phase to be distilled and adding a metal alcoholate to the product mixture in the liquid at a temperature in the range from 10-60° C., and thoroughly mixing the neutralized product mixture, said alcoholate being employed in an equimolar amount or in a stoichiometric excess based on the amount of acidic chloride, and (iii) purifying the treated product mixture by distillation under reduced pressure, thereby preparing alkoxysilanes which are low in acidic chloride or essentially free of acidic chloride.
摘要:
Aminoalkylsilanes of formula I: R1R2N—(CH2)y—Si(OR3)3−nR4n (I), wherein R1 and R2 are each independently, identical of different, hydrogen, aryl, arylalkyl or C1-4-alkyl; R3 and R4 are each independently, identical or different, C1-8-alkyl or aryl; y is 2, 3 or 4 and n is 0 or 1, 2 or 3, are prepared by a process comprising: reacting an organosilane of formula II: X—(CH2)y—Si(OR3)3−nR4n (II), wherein X is Cl, Br, I or F; and R3, R4, y and n are each as defined above with ammonia or an organic amine compound of the formula: HNR1R2 (III), wherein R1 and R2 are each as defined above with at least one of R1 and R2 not being hydrogen in a liquid phase; evaporating ammonia or organic amine under reduced pressure while ammonium chloride or aminohydrochloride by-products, produced in the reaction of the first step, remains dissolved in the liquid phase; transferring the product mixture after said evaporation to another vessel operated at a lower pressure level of than the second stage, and allowing ammonium chloride or aminohydrochloride to crystallize; separating the crystalline ammonium chloride or aminohydrochloride from the crude product; and distilling the crude product to produce purified aminoalkylsilane product.
摘要:
A process for preparing an alkoxysilane with an acidic chloride content of less than 10 ppm by weight, comprising:reacting a chlorosilane with an alcohol in a water-free and solvent-free phase to form a product mixture containing alkoxysilane and residual acidic chloride, with removal of resultant hydrogen chloride from the product mixture,then adding liquid or gaseous ammonia, in an amount corresponding to a stoichiometric excess, based on the content of acidic chloride, to form an ammonia-containing product mixture,treating the ammonia-containing product mixture at a temperature between 10 and 50.degree. C., wherein the ammonia and acidic chloride undergo neutralization, to form a crude product, and optionally, then separating off a salt formed in the course of neutralization, from the crude product, andrecovering the alkoxysilane by distilling the crude product.
摘要:
The invention relates to a process for dismutating at least one halosilane and reducing the content of extraneous metal and/or a compound containing extraneous metal in the at least one halosilane and in the at least one silane obtained, by contacting at least one halosilane of the general formula I, HnSiClm (I), where n and m are integers and n=1, 2 or 3 and m=1, 2 or 3 and n+m=4, with a particulate, organic, amino-functional resin to obtain at least one silane of the general formula II, HaSiClb (II), where a and b are integers and a=0, 2, 3 or 4 and b=0, 1, 2 or 4 where a+b=4, in one step, in which the content of extraneous metal and/or compounds containing extraneous metal has been reduced compared to the halosilane of the formula I. The invention further provides for the use of this resin for dismutating halosilanes and as an absorbent of extraneous metals or compounds containing extraneous metal in a process for preparing monosilane.
摘要:
The invention relates to a method for indirectly determining the purity of silanes and germanes using a device for measuring specific resistance. The invention further relates to a system for industrially producing and/or filling containers with silanes or germanes, including a quality control in which a device is used for measuring specific resistance.
摘要:
The invention relates to a process for preparing monomeric and/or dimeric halogen- and/or hydrogen-containing silicon compounds from oligomeric inorganic silanes having three or more directly covalently interconnected silicon atoms substituted by substituents selected from halogen, hydrogen and/or oxygen by reacting the oligomeric silane over a nitrogen-containing catalyst in the presence of hydrogen halide.
摘要:
The invention relates to an empty container (1) for accommodating high-purity and ultra-high-purity, air- and/or moisture-sensitive liquid or condensable compounds, comprising a cylindrical jacket (3), a bottom (4a) and an upper end piece (4b, 4b′) at the two ends of the cylindrical jacket, an associated connection unit (2) including shut-off/multiple-way and rinsing system (5), and an associated immersion pipe (7), characterized in that the lower end of the immersion pipe (7a) protrudes into a recess (4c) (depression), which is introduced in the bottom (4a) and which is the lowest point of the bottom, and/or the lower end of the immersion pipe (7a) is tapered and is brought close to the lowest point of the bottom (4a) to within less than 2 mm by means of the tip of the tapered immersion pipe (7b) or touches the lowest point of the bottom with the tip of the tapered immersion pipe (7b). The invention further relates to the use of empty containers according to the invention for storing, handling, and/or transporting such high-purity and ultra-high-purity compounds.