USRE33452E - Method for making alkylhalosilanes - Google Patents
Method for making alkylhalosilanes Download PDFInfo
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- USRE33452E USRE33452E US06/911,614 US91161486A USRE33452E US RE33452 E USRE33452 E US RE33452E US 91161486 A US91161486 A US 91161486A US RE33452 E USRE33452 E US RE33452E
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/835—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with germanium, tin or lead
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic System
- C07F7/02—Silicon compounds
- C07F7/08—Compounds having one or more C—Si linkages
- C07F7/12—Organo silicon halides
- C07F7/16—Preparation thereof from silicon and halogenated hydrocarbons direct synthesis
Definitions
- the present invention relates to a method for making alkylhalosilanes. More particularly, the present invention relates to a process involving the reaction of methyl chloride and powdered silicon in the presence of a copper-zinc-tin catalyst.
- methylchlorosilanes were made by effecting reaction between powdered silicon and methyl chloride in the presence of a copper catalyst, as shown by U.S. Pat. No. 2,380,995, Rochow, assigned to the same assignee as the present invention. Improved results were achieved by utilizing a fluidized bed reactor, as shown by Reed et al, U.S. Pat. No. 2,389,931, also assigned to the same assignee as the present invention. Further improvements in the production of particular methylchlorosilanes were achieved when zinc was used in combination with copper catalyst as a promoter as shown by Gilliam, U.S. Pat. No. 2,464,033.
- Gilliam teaches that a proportion of from about 2 to about 50% by weight of copper in elemental form or as the halide or oxide, and preferably 5 to 20% and from about 0.03 to about 0.75% by weight of zinc in the form of zinc halide, zinc oxide, or zinc metal, or mixture thereof, where the weight of copper and zinc are based on the weight of silicon, can be used as a promoter for making dialkyl substituted dihalogenosilanes, such as dimethyldichlorosilane in the direct reaction between silicon powder and methyl chloride.
- methylchlorosilanes includes dimethyldichlorosilane, which is the preferred methylchlorosilane, and a variety of other silanes such as tetramethylsilane, trimethylchlorosilane, methyltrichlorosilane, silicon tetrachloride, trichlorosilane, methyldichlorosilane and dimethylchlorosilane.
- Residue is also formed during the production of methylchlorosilane crude.
- Residue means products in the methylchlorosilane crude having a boiling point >70° C. at atmospheric pressure.
- Residue consists of such materials as disilanes, for example, symmetrical 1,1,2,2-tetrachlorodimethyldisilane, 1,1,2-trichlorotrimethyldisilane, disiloxanes, disilmethylenes and other higher boiling species, for example, trisilanes, trisiloxanes, trisilmethylenes, etc.
- T/D weight ratio of the methylchlorosilane crude is the ratio of methyltrichlorosilane to dimethyldichlorosilane in the crude methylchlorosilane reaction product. Accordingly, an increase in the T/D ratio indicates that there is a decrease in the production of the preferred dimethyldichlorosilane.
- K p reaction rate constant for methylchlorosilane product
- K p values can be obtained using an apparatus as shown by FIG. 2.
- a "K p 38 (grams silane/grame silicon, hr) having a numerical value of about 13 can be obtained.
- a K p of 16 can be obtained from a mixture of powdered silicon containing 5% by weight copper and 0.5% by weight zinc.
- a K p of 45 can be obtained when a mixture of powdered silicon containing 5% weight copper and 0.005% by weight tin is reacted with methyl chloride.
- the term "selectivity" means the ability of a catalyst to maximize the production of dimethyldichlorosilane, as shown for example by a reduction in the value of the T/D ratio and a reduction in the % residue. It is found, for example, that although a higher K p can be obtained when tin is utilized with copper to catalyze the reaction between powdered silicon and methyl chloride, a significant increase in the T/D ratio is also effected, as compared to the use of a copper catalyst promoted with zinc.
- the present invention is based on the surprising discovery that direct method reactions between powdered silicon and methyl chloride in the presence of an effective amount of a copper-zinc-tin catalyst as defined hereinafter, can provide K p values about twice that shown for tin promoted copper catalyst as discussed above, while simultaneously substantially improving the selectively over zinc promoted copper catalyst and over tin promoted copper catalyst.
- optimum selectivity and maximum K p values can be obtained by practicing the direct method with a mixture of powdered silicon, copper, tin and zinc containing 0.5-10% by weight of copper, based on the weight of silicon, where the copper can be in the free state or in the form of a copper compound as defined hereinafter, with 0.01 to 0.5 part of zinc, per part of copper and 200-3,000 ppm of tin relative to copper, where both zinc and tin are also expressed in terms of weight of metal, although optionally employed as a zinc compound or a tin compound, as defined hereinafter.
- a method for making methylchlorosilanes which substantially enhances the rate of dimethyldichlorosilane formation, while substantially reducing the weight ratio of methyltrichlorosilane to dimethyldichlorosilane, and maintaining or reducing the percent by weight of products in the resulting methylchlorosilane crude having a boiling point of greater than 70° C. at atmospheric pressure which comprises,
- a copper-zinc-tin catalyst produced by the introduction of a mixture of powdered silicon, copper, or copper compound, zinc or zinc compound, and tin or tin compound, where the copper or copper compound, tin or tin compound, and zinc or zinc compound are introduced along with powdered silicon and methyl chloride, and the introduction of copper, tin and zinc or compounds thereof is effected at a rate sufficient to maintain in the reactor, a copper-zinc-tin catalyst having an average composition of 0.5-10% by weight copper relative to silicon, 200-3,000 ppm tin relative to copper and 0.01 part to 0.5 part and preferably 0.01 to 0.30 part of zinc per part of copper.
- methyl chloride is preferably used in the practice of the present invention
- C.sub.(1-4) alkylchlorides for example, ethylchloride, propylchloride, etc, also can be used.
- Methyl chloride, or an inert gas such as argon, or mixture thereof can be used to fluidize the bed of silicon particles in the reactor with or without catalyst values.
- the silicon present in the fluidized bed can have a particle size below 700 microns, with an average size of greater than 20 microns and less than 300 microns in size.
- the mean diameter of the silicon particles is preferably in the range of 100 to 150 microns.
- Silicon is usually obtained at a purity of at least 98% by weight of silicon and it is then comminuted to particles of silicon in the above-described range, and is fed into an appropriate reactor as needed.
- a fluidized bed is preferred, the process of the present invention can be utilized in other types of reactors, such as fixed bed and a stirred bed.
- a fluidized reactor is preferably utilized since the optimum selectivity and the maximum amount of methylchlorosilane is obtained.
- the process of the present invention can be carried out at a temperature in the range of 250°-350° C. and more preferably at a temperature range of 260°-330° C. Reaction can occur under continuous conditions or as a batch reaction.
- continuous reaction or “continuous conditions” with respect to the description of the reaction of powdered silicon and methyl chloride in the presence of the copper-zinc-tin catalyst means that the reaction is conducted in a fluid bed reactor under continuous conditions, or in a fluid bed reactor or stirred bed reactor under simulated continuous conditions.
- FIG. 1 shows reaction under continuous conditions.
- FIG. 2 shows the method of the present invention employing a fluid bed reactor with a stirrer, which can be operated in a batch mode.
- the stirrer is employed to agitate and enhance fluidization of powdered silicon and catalyst components, such as cuprous chloride, zinc metal dust and tin powder to initiate the direct reaction between powdered silicon and methyl chloride.
- a contact mass of powdered silicon, with copper-zinc-tin catalyst can be made prior to contact with methyl chloride to facilitate the generation of methylchlorosilanes.
- a reactive copper compound such as cuprous chloride, etc.
- tin and zinc can be mixed with appropriate amounts of powdered silicon, tin and zinc and heated to a temperature of about 280°-400° C.
- Methyl chloride gas can be continuously passed through the reactor to fluidize the reaction mass and there can be passed out of the reactor, gaseous methylchlorosilanes as well as the unreacted methyl chloride.
- the gaseous crude product mixture and entrained reaction particulates are passed out of the fluidized reactor and passed through one or more cyclones so as to separate the larger particles of materials from the product gas stream. These particles can be returned to the reactor for further utilization in the process so as to maximize the yield of dimethyldichlorosilane from the silicon. Smaller particles are passed out with the product stream and the stream is subsequently condensed.
- Purified methyl chloride is heated and recycled through the fluidized reactor for the further production of methylchlorosilanes.
- the crude methylchlorosilane stream is passed to a distillation train so as to distill out in essentially pure form various chlorosilane fractions produced by the process. It is necessary to distill and purify the dimethyldichlorosilane and the other chlorosilanes so that they can be utilized in the process for producing silicone materials.
- copper compounds which can be used to make the copper-zinc-tin catalyst or particulated silicon-copper-zinc-tin contact mass in accordance with the practice of the present invention, are carboxylic acid salts of copper such as copper formate, copper acetate, copper oxylate, etc.
- Copper formate is the preferred carboxylic acid salt of copper which can be further characterized as a substantially anhydrous granular material derived from technical grade cupric formate dihydrate (Cu(CHO 2 ) 2 .2H 2 O) or cupric formate tetrahydrate (Cu(CHO 2 ) 2 .4H 2 O) and exhibiting a BET surface area of from 0.5-20 M 2 /gram by the nitrogen adsorption method.
- partially oxidized copper as the copper source.
- Useful sources of partially oxidized copper are taught in copending application Ser. No. 288,175, filed July 29, 1981, Ritzer et al, A Catalyst for a Process for Making Silicones.
- partially oxidized for cemented copper contains a level of tin relative to copper which exceeds the range required in the practice of the present invention to make the copper-zinc-tin catalyst, satisfactory results can be achieved if the reactor is purged of excess tin by employing partially oxidized copper substantially free of tin for a predetermined period of time.
- mixtures of tin containing and partially oxidized copper substantially free of tin can be used to maintain the desired tin concentration relative to copper in practicing the method of the present invention.
- Additional copper materials which can be utilized in the practice of the present invention for making the catalyst, are particulated cupric chloride, cuprous chloride, particulated copper metal, etc.
- Zinc metal halides of zinc, for example zinc chloride and zinc oxide have been found effective as catalyst components.
- Tin metal dust (-325 ASTM mesh), tin halides, such as tin tetrachloride, tin oxide, tetramethyl tin, and alkyl tin halides also can be used as the source of tin for making the copper-zinc-tin catalyst.
- the copper-zinc-tin catalyst or powdered silicon-copper-zinc-tin contact mass of the present invention can be made by introducing the above-described components into the reactor separately or as a mixture, masterbatch, alloy or blend of two or more of the various components in elemental form or as compounds or mixtures thereof.
- the methyl chloride which is passed or subjected to the direct process in the fluidized bed reactor is heated to the temperature above its boiling point and passed as a gas at sufficient rate through the reactor to fludize the bed of silicon particles activated with copper-zinc-tin catalyst.
- the process of the present invention can be carried out in a fluid bed reactor having a jet mill at the bottom.
- a suitable jet mill arrangement is shown by Dotson, U.S. Pat. No. 3,133,109, wherein large silicon particles are comminuted.
- the resulting finer particles of silicon and catalyst can be further used in the reactor to produce the desired alkylhalosilane.
- Shade U.S. Pat. No. 4,281,149 which is assigned to the same assignee as the present invention and hereby incorporated by reference. Shade advantageously effects the removal of smaller silicon particles from the fluidized bed reactor, abrades and thereafter recycles the particles.
- FIG. 1 is a schematic of a fluid bed reactor operated under continuous conditions and providing for the fluidization of a bed of powdered silicon, means for introducing methyl chloride under pressure to fluidize such bed, a heat exchange element for controlling the temperature of the bed, means for introducing a copper source, separate means for introducing a tin and a zinc source, means for recycling silicon fines and catalyst and means for separating methychlorosilane crude.
- FIG. 2 is a schematic of a fluid bed reactor which can be operated in a batch mode having a stirrer for the fluid bed which serves to facilitate the formation of a powdered silicon-copper-zinc-tin contact mass from an initial charge of powdered silicon, copper compound, such as cuprous chloride, powdered zinc metal and powdered tin metal.
- a stirrer for the fluid bed which serves to facilitate the formation of a powdered silicon-copper-zinc-tin contact mass from an initial charge of powdered silicon, copper compound, such as cuprous chloride, powdered zinc metal and powdered tin metal.
- FIG. 1 a fluid bed reactor at 10, the top of a bed of fluidized silicon at 11 which is supported by methyl chloride introduced into the reactor at ports 12, 13 and 14.
- Copper metal or copper compound in the form of copper oxide, copper formate, or a copper halide, such as cuprous chloride, can be continuously introduced into the fluid bed through feed pipe 15.
- Zinc metal or compounds thereof along with tin metal or compound, such as tin oxide, can be introduced along with makeup silicon at 16.
- tin is introduced in the form of a tin halide, such as tin tetrachloride, it can be introduced at 17 or along with methyl chloride at 14.
- the temperature of the fluid bed is maintained at between 260°-330° C. by use of a heat exchanger through which heat transfer fluid flows through at 18 and 19.
- a cyclone at 20 continuously returns particulated silicon back to the reactor. Silicon fines which are not caught at cyclone 20 are conveyed by line 21 to a second cyclone 22. Fines recovered thereby are stored at 24 and 25 and returned to the reactor at 26 on a continuous basis. In instances where fines are not trapped at cyclone 22, they can be conveniently disposed at 23. Along with silicon fines, there is also returned to the reactor at line 26, catalytic amounts of copper, tin and zinc which serve to maintain the catalyst within the critical range.
- a fluid bed reactor 30 having a fluid bed at 31, a supporting perforated plate at 32 through which fluidizing methyl chloride can flow, a thermocouple sensor at 33 to monitor the temperature of the fluid bed, a port at 34 for introducing powdered silicon catalyst mixture, a port at 36 for separating methylchlorosilane crude, a port at 37 for introducing methyl chloride, a thermocouple sensor at the bottom of the transmission plate to monitor the temperature of the methyl chloride, a jacketed cylinder at 40 having heating means 41 and 42, respective power means 43 and 44, and an outer jacket at 50 which serves as an insulator for heaters 41 and 42.
- reaction rate constant K p establishes the crude methylchlorosilane rate.
- K p can be derived by rearranging and integrating the equation
- Equation (1) is based on the assumption that all the crude methylchlorosilane is dimethyldichlorosilane.
- Equation (2) empirically derived, is found in "Organohalosilanes: Precursors to Silicones", by R. Voorhoeve, p. 229, Elsevier (1967), where
- Equation (3) is substituted into Equation (2) which is then numerically integrated in order to obtain the mass reaction rate constant K p having units of ##EQU4##
- a fluid bed reactor similar to that shown in FIG. 2 is set up consisting of three concentric 20 inch glass tubes having ID's of 23/4 inch, 2 inch and 11/2 inch.
- the 11/2 inch reactor tube has a distribution plate half way up the middle of the tube and a stirrer with a paddle above the distribution plate.
- the 11/2 inch ID reactor tube is located within the 2 inch ID furnace tube having a tin oxide resistance coating and the 2 inch ID furnace tube is enclosed within the 23/4 inch ID insulating tube.
- a mixture is prepared consisting of 100 parts of powdered silicon, 7.8 parts of cuprous chloride powder, 0.5 part of zinc dust and 0.005 parts of powdered tin.
- the powdered silicon has an average surface area of 0.5 square meters per gram, a maximum particle size of up to about 70 microns, and impurities as follows:
- the cuprous chloride utilized in the above mixture is a substantially pure granular material of ⁇ 325 ASTM mesh particle size, and containing less than 200 ppm iron and less than 20 ppm each of the following elements: Ni, Bi, Mg, Sn, Pb and Zn.
- the tin and zinc metal used in the above mixture have less than about 100 ppm of metallic and non-metallic impurities.
- the mixture of silicon powder and catalyst ingredients is fed into the above-described reactor at a temperature of about 300° C. with methyl chloride flowing upward through the distribution plate and the stirrer is operated to agitate the fluid bed.
- Table IV is a consolidation of Tables I-III and some of the above data. It shows the approximate effects of the presence or complete absence of various combinations of copper, zinc and tin on rate and selectivity with respect to methylchlorosilane production resulting from the reaction of powdered silicon and methyl chloride.
- the copper-zinc-tin catalyst of the present invention provides a surprising rate improvement, while selectivity is also substantially improved with respect to dimethyldichlorosilane production as compared to the use of a copper catalyst alone, or a copper catalyst promoted with zinc or tin alone.
- a 1 inch stirred bed reactor was set up.
- the stirred bed reactor consisted of a stainless steel tube approximately 18 inches long with a 1 inch ID. It was equipped with dual zone electrical heaters to provide a reaction zone of about 1" ⁇ 6". It was also equipped with a helical stainless steel stirrer.
- the stirred bed reactor was preheated to 300° C. under a purge of nitrogen until stabilized.
- the reactor was then charged with a mixture of powdered silicon as utilized in Example 1, 5% by weight thereof of copper, utilized in the form of partially oxidized copper, 0.5% by weight of zinc, based on the weight of copper, and 500 ppm of tin per part of copper.
- the partially oxidized copper had the following approximate composition:
- Silicon powder having an average particle size of greater than about 20 microns and less than about 300 microns is fluidized in a fluid bed reactor with methyl chloride which is continuously introduced at a pressure of from about 1 to about 10 atmospheres. The temperature of the reactor is maintained at about 250° C. to 350° C. Partially oxidized copper of Example 2 is continuously introduced at a rate sufficient to maintain from about 0.5% to about 10% by weight of copper based on the weight of fluidized silicon. Tin tetrachloride is introduced into the fluid bed reactor at least periodically at a rate sufficient to maintain a tin concentration of about 200-3,000 ppm of tin based on the weight of copper. A mixture of zinc metal dust and powdered silicon is laterally introduced into the fluid bed reactor at a rate sufficient to maintain a ratio of zinc to copper having a value of from about 0.01 to 0.25 part of zinc per part of copper.
- elutriated silicon containing material having copper-zinc-tin catalyst values and in the form of an average particle size of about 2 to 50 microns and containing a mixture of particulated silicon, copper, tin and zinc are at least periodically recycled into the fluid bed.
- the above K p value, T/D ratio and % residue shows that the copper-zinc-tin catalyst of the present invention can provide a satisfactory dimethyldichlorosilane production rate while maintaining a high degree of selectivity under continuous reaction conditions in a fluid bed reactor.
- the contact mass was charged to a 11/2 inch inside diameter fluidized bed reactor.
- the temperature was raised to 300° C. and methyl chloride flow was initiated.
- a condenser downstream of the reactor was used to recover crude chlorosilane products.
- the rate of crude production was determined by weighing recovered crude over predetermined time intervals.
- the composition of the crude was determined by gas chromatography. The following results were obtained after about 20% of the silicon has been reacted which was also approximately the same results achieved after 80-90% of the silicon had been utilized.
Abstract
Description
______________________________________ CuO 32-33% Cu.sub.2 O 57-59% Cu* 5-10% Fe 350 ppm Sn 54 ppm Pb 22 ppm Insolubles ˜0.05% Bi, Ti <20 ppm ______________________________________
F·dX=2·R·dm.sub.Si (1)
______________________________________ Compound Amount (ppm) ______________________________________ Iron 5600 Aluminum 2700 Titanium 850 Manganese 200 Calcium 160 Nickel 120 ______________________________________
TABLE I ______________________________________ THE EFFECT OF TIN ON RATE AND SELECTIVITY Runs at 300° C., Zn/Cu = 0.10 Sn/Cu Rate* (ppm) % Cu (K.sub.ρ) % Residue** T/D** ______________________________________ 0 5 16 2.1 0.09 420 5 33 1.4 0.06 1000 5 84 1.3 0.06 1500 5 106 1.6 0.05 2200 5 132 2.1 0.06 3000 5 194 6.4 0.05 1000 1.5 32 1.9 0.06 3000 1.5 75 5.2 0.04 ______________________________________ *values obtained at 20% silicon utilization **cumulative values up to 40% silicon utilization
TABLE II ______________________________________ THE EFFECT OF Zn/Cu Ratio ON RATE AND SELECTIVITY (1000 ppm Sn/Cu) Zn/Cu % Cu T/D** Rate* (K.sub.ρ) % Residue** ______________________________________ 0 5 0.14 46 2.1 0.02 5 0.06 50 3.1 0.05 5 0.04 72 2.3 0.10 5 0.05 84 1.3 0.14 5 0.05 61 0.6 0.20 5 0.06 83 2.2 0.25 5 0.07 81 1.6 0.38 5 0.09 84 1.4 0.50 5 0.05 75 1.3 0.60 5 0.10 78 2.0 ______________________________________ *measured at 20% silicon utilization **measured at 40% silicon utilization
TABLE IIA ______________________________________ Rate* Zn/Cu % Cu T/D** (K.sub.ρ) % Residue** ______________________________________ 0.006 1.5 0.062 35 2.4 0.011 1.5 0.052 58 3.1 0.017 1.5 0.046 76 2.1 0.022 1.5 0.041 48 3.3 0.048 1.5 0.042 51 2.4 0.054 1.5 0.056 38 1.8 0.25 1.5 0.099 53 1.9 ______________________________________ *measured at 20% silicon utilization **measured at 40% silicon utilization
TABLE III ______________________________________ EFFECT OF COPPER CONCENTRATION ON RATE AND SELECTIVITY Sn/Cu Rate* % Cu Zn/Cu ppm (K.sub.ρ) T/D* % Residue* ______________________________________ 1.5 0.05 1000 51 0.042 2.4 1.5 0.05 1000 38 0.056 1.8 5 0.05 1000 174 0.037 1.7 5 0.05 1000 69 0.041 0.7 5 0.10 420 46 0.045 1.3 10 0.10 420 143 0.067 1.7 ______________________________________ *measured at 20% silicon utilization
TABLE IV ______________________________________ EFFECTS OF COPPER, TIN, AND ZINC ON RATE AND SELECTIVITY % Cu % Zn % Sn Rate T/D Residue ______________________________________ 0 0.05 0.005 0 -- -- 5 0 0 13 0.21 1.9 5 0.5 0 16 0.060-.090 1.6-1.9 5 0 0.005 46 0.11-.12 2.2-2.4 5 0.5 0.005 84-107 0.05-.057 1.3-1.4 ______________________________________
______________________________________ CuO 32-33% Cu.sub.2 O 57-59% Cu* 5-10% Fe 350 ppm Sn 54 ppm Pb 22 ppm Insolubles ˜0.05% ______________________________________
TABLE V ______________________________________ K.sub.ρ 65-75 T/D 0.07-0.08 % Residue 4-5 ______________________________________
TABLE VI ______________________________________ K.sub.ρ * T/D % Residue ______________________________________ 20-40 0.07-0.10 4-5% ______________________________________ *reference to 300° C. at 1 atmosphere
______________________________________ Sn/Cu % Copper (ppm) Zn/Cu K.sub.ρ T/D % Residue ______________________________________ 5 1000 0.10 84 0.052 1.3 ______________________________________
Claims (29)
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Cited By (17)
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US5068385A (en) * | 1989-09-08 | 1991-11-26 | Bayer Aktiengesellschaft | Process for the preparation of alkyl halogenosilanes |
US5281739A (en) * | 1992-12-23 | 1994-01-25 | Dow Corning Corporation | Process for manufacture of alkylhalosilanes |
US5312948A (en) * | 1993-10-08 | 1994-05-17 | Dow Corning Corporation | Particle size distribution for fluidized-bed process for making alkylhalosilanes |
US5338876A (en) * | 1992-06-13 | 1994-08-16 | Korea Institute Of Science And Technology (Kist) | Alkenylchlorosilanes and direct synthesis thereof |
EP0671402A1 (en) * | 1994-03-10 | 1995-09-13 | Wacker-Chemie GmbH | Process for the preparation of methylchlorosilanes |
US5596119A (en) * | 1995-12-05 | 1997-01-21 | Dow Corning Corporation | Method for controlling the direct process product distribution |
US5625088A (en) * | 1995-08-17 | 1997-04-29 | Wacker-Chemie Gmbh | Process for preparing dimethyldichlorosilane |
US5679823A (en) * | 1995-09-01 | 1997-10-21 | Bayer Aktiengesellschaft | Method of producing alkyl halogen silanes |
US5874604A (en) * | 1996-11-04 | 1999-02-23 | Ge Bayer Silicones Gmbh & Co. Kg | Process for preparing alkyl halosilanes |
US6175030B1 (en) | 1999-04-27 | 2001-01-16 | Wacker-Chemie Gmbh | Process for the preparation of organochlorosilanes |
US6407276B1 (en) | 2001-03-29 | 2002-06-18 | General Electric Company | Method for improving selectivity for dialkyldichlorosilane |
KR100750003B1 (en) * | 1999-05-27 | 2007-08-16 | 제너럴 일렉트릭 캄파니 | Method for making alkylhalosilanes |
US20070244337A1 (en) * | 2003-11-05 | 2007-10-18 | Pascale Colin | Direct Method for Synthesising Alkylhalogenosilanes |
US20080262258A1 (en) * | 2004-05-04 | 2008-10-23 | Dow Corning Corporation | Container For Forming Self-Baking Electrodes |
WO2011046663A1 (en) | 2009-10-16 | 2011-04-21 | Dow Corning Corporation | Method of making organohalosilanes |
US20110158884A1 (en) * | 2008-06-04 | 2011-06-30 | David Charles Bentley | Preparation Of Organohalosilanes and Halosilanes |
CN109821482A (en) * | 2019-03-28 | 2019-05-31 | 合盛硅业股份有限公司 | The automatic continuous adding method of catalyst and device |
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US5338876A (en) * | 1992-06-13 | 1994-08-16 | Korea Institute Of Science And Technology (Kist) | Alkenylchlorosilanes and direct synthesis thereof |
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US5679823A (en) * | 1995-09-01 | 1997-10-21 | Bayer Aktiengesellschaft | Method of producing alkyl halogen silanes |
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