摘要:
The invention relates to the use of nanoscale sterols and/or sterol esters with particle diameters of 10 to 300 nm as food additives and as active substances for the production of hypocholesterolemic agents. The particular fineness of the particles promotes more rapid absorption by the blood serum after oral ingestion by comparison with conventional sterols and sterol esters.
摘要:
Method for producing alkali metal silicates from crystalline siliceous material and aqueous alkali metal hydroxide solution at high temperature and normal pressure, characterized in that cristobalite and/or tempered quartz sand are used as the siliceous material, and this material is reacted with aqueous, 20 to 50 wt. % sodium or potassium hydroxide solution at temperatures of 100.degree. to 150.degree. C. and normal pressure, the molar ratio of SiO.sub.2 to Na.sub.2 O or K.sub.2 O in the reaction mixture being between 2:1 and 1:7.
摘要:
In a process for the production of an aqueous alkaline suspension of low-grit, crystallized zeolitic sodium aluminosilicate of the smallest particle size having the composition0.9 to 1.1 Na.sub.2 O. 1 Al.sub.2 O.sub.3 . 1.8 to 2.5 SiO.sub.2with a water content depending on the degree of drying, which contains at least 99.8% by weight of a particle size of less than 25 .mu.m and has a high cation exchange capability, comprising crystallization of an aqueous alkaline suspension of an x-ray-amorphous sodium aluminosilicate, said suspension having a composition corresponding of the molar ratios of 1.5 to 5 Na.sub.2 O:1 Al.sub.2 O.sub.3 :1 to 4 SiO.sub.2 :40 to 400 H.sub.2 O, at elevated temperatures and recovering crystallized zeolitic sodium aluminosilicate, the improvement consisting of feeding the suspension of the x-ray-amorphous sodium aluminosilicate continuously into a crystallizing reactor having progressively, separately zoned mixing areas with a stage-like effect and having at least 20 stages, wherein the suspension flows first through at least 8 stages in the intake part of the reactor, which intake part of the reactor may comprise up to one third of the total reactor volume, maintaining said suspension in the reactor at a preselected temperature in the range of from 80.degree. to 100.degree. C. until the degree of crystallization of the zeolitic sodium aluminosilicate, determined by x-ray, has reached at least 80% of the theoretically possible crystallinity. and continuously removing the suspension from the end opposite of the intake end of the reactor.
摘要:
This invention is directed to an improved process for the preparation of condensable, film-forming organosilazanes by ammonolysis of organohalosilanes with liquid ammonia, the improvement comprising reacting a from about 5 to 15% by weight solution of organohalosilane in inert solvent with excess liquid ammonia under pressure at temperatures between 0.degree. and 50.degree. C.
摘要:
A process for the hydrothermal fusion of aluminum silicate and alkali aluminum silicates with aqueous sodium hydroxide solution under pressure and at elevated temperatures in the presence of soluble silicates, in which an aqueous solution containing from about 20 to about 50% by weight of NaOH is mixed with aluminum silicates and/or alkali aluminum silicates, and with a hydrothermally fusible silicate component, wherein the ratio by weight of SiO.sub.2 to Al.sub.2 O.sub.3 in the mixture amounts to at least 30:1 and the ratio by weight of SiO.sub.2 to Na.sub.2 O amounts to at least 1.5:1, and the mixtures are reacted at temperatures of from about 180.degree. to about 250.degree. C. and under the saturated steam pressures corresponding to those temperatures. The resulting sodium silicate solution, which contains the dissolved aluminum, is then separated off.
摘要:
A process for the continuous production of an aqueous, alkaline suspension of x-ray amorphous sodium aluminosilicate having a small particle size of at least 99% by volume of a particle size of less than 50.mu., suitable for conversion into zeolite sodium aluminosilicate of the smallest particle sizes, by mixing an aqueous sodium aluminate solution with an aqueous sodium silicate solution in the presence of excess sodium hydroxide solution at a temperature in the range of from 20.degree. to 103.degree. C., where the solutions being mixed have a mathematical total molar ratio of:1.5 to 9 Na.sub.2 O : 1 Al.sub.2 O.sub.3 : 1 to 7 SiO.sub.2 : 40 to 400 H.sub.2 Oconsisting essentially of the steps of continuously passing one of said two aqueous solutions into the entrance of an elongated substantially circular cross-sectional reaction zone having a ratio of length to diameter of more than 500, continuously splitting the other aqueous solution into at least three partial streams, continuously passing the first of said partial streams into said entrance, continuously passing the mixed contents through said elongated reaction zone divided into a first zone where the mean holding time is from 5 to 60 seconds into a second zone of said elongated reaction zone, continuously passing the remainder of said partial streams separately into downstream zones of said elongated reaction zone, where said mean holding time of the reaction mixture in each of said separate zones of said elongated reaction zone is at least 5 seconds and sufficient to effect substantial mixing of said contents, the mean holding time in the entirety of said elongated substantially circular cross-section reaction zone being at least 3 minutes.
摘要翻译:一种连续生产x射线无定形硅铝酸钠的水性,碱性悬浮液的方法,其具有至少99体积%的小于50微米的粒度的小粒径,适用于转化为沸石的硅铝酸钠 通过在过量氢氧化钠溶液存在下,在20至103℃的温度范围内混合铝酸钠水溶液与硅酸钠水溶液,其中混合的溶液具有数学总和 摩尔比为:1.5至9 Na 2 O:1 Al 2 O 3:1至7 SiO 2:40至400H 2 H 2 H组成,其基本上包括以下步骤:将所述两种水溶液中的一种连续通过细长的基本上圆形的横截面反应区的入口, 长度与直径的比例大于500,连续地将另一个水溶液分裂成至少三个部分流,连续地通过第一个所述分裂 l流入所述入口,连续地将混合的内容物通过所述细长反应区域分成第一区域,其中平均保持时间为5至60秒,进入所述细长反应区域的第二区域,连续地将剩余的所述部分流 分开地进入所述细长反应区的下游区,其中所述细长反应区的每个所述分离区中的反应混合物的平均保持时间为至少5秒,并足以使所述内容物实质混合,将平均保持时间 所述细长的基本圆形的横截面反应区的整体为至少3分钟。
摘要:
This invention relates to adhesive compositions of which the binder system contains nanoscale particles with ferromagnetic, ferrimagnetic, superparamagnetic or piezoelectric properties. The invention also relates to dissolvable adhesive bonds and to a process for dissolving adhesive bonds.
摘要:
In a process for the conversion of meta-kaolin into an aqueous alkaline suspension of low-grit, water-containing zeolitic sodium aluminosilicate of the smallest particle size having the molar composition:0.9 to 1.1 Na.sub.2 O: 1 Al.sub.2 O.sub.3 : 1.8 to 2.3 SiO.sub.2with a water content depending on the degree of drying, which contains at least 99.8% by weight of a particle size of less than 25.mu. and has a high cation exchange capability, the improvement consisting of:slowly heating a suspension of reactants to a zeolitization temperature in the range of from 70.degree. to 100.degree. C., with a temperature rise averaging 20.degree. C. within a period of from two to ten minutes,feeding the suspension, preferably before said slow heating, continuously into a reactor having progressively, separately zoned mixing areas with a stage-like effect and having at least seven stages while mixing said suspension sufficiently in the respective stages to avoid sedimentation,maintaining said suspension in the reactor at a preselected temperature in the range of from 70.degree. to 100.degree. C. until the degree of crystallization of the zeolitic sodium aluminosilicate, determined by X-ray, has reached at least 80% of the theoretically possibility crystallinity, andcontinuously removing an aqueous, alkaline suspension of zeolitic sodium aluminosilicate from the end opposite of the intake end of the reactor.The suspension traverses the reactor at a rate in the range of 1 to 3 cubic meters of suspension per cubic meter of reactor volume and per hour. Reactors preferred for the reaction are an agitator vessel cascade with at least seven vessels, an agitator column with at least seven chambers, and a flowing tube reactor which has a ratio of tube length to tube diameter in the range of 3,000 to 7,000.
摘要翻译:在将高岭土转化为具有摩尔组成为0.9至1.1Na 2 O:1 Al 2 O 3:1.8至2.3SiO 2的具有最小粒度的低浓度含水沸石硅铝酸钠的水性碱性悬浮液的方法中, 水含量取决于干燥程度,其含有至少99.8重量%的粒度小于25微米并且具有高阳离子交换能力,其改进包括:将反应物的悬浮液缓慢加热至沸点温度 在70℃至100℃的范围内,在两到十分钟的时间内平均温度升高20℃,优选在所述缓慢加热之前将悬浮液连续进入逐个地分开的反应器中 混合具有阶段效应的区域并且具有至少七个阶段,同时在各个阶段充分混合所述悬浮液以避免沉降,将所述悬浮液保持在反应器中 选择的温度范围为70〜100℃,直到通过X射线测定的沸石硅铝酸钠的结晶度达到理论上可能性结晶度的至少80%,并连续除去水性碱 沸石铝硅酸钠从反应器入口端相反的一端的悬浮液。 悬浮液以每立方米反应器体积和每小时1至3立方米悬浮液的速率穿过反应器。 对于反应优选的反应器是具有至少七个容器的搅拌器容器,具有至少七个室的搅拌器柱和具有3000至7000的管长与管直径之比的流管反应器。
摘要:
Effective, titanium-free agents for activating metal surfaces prior to phosphating these surfaces with phosphating baths containing zinc ions can be made by reacting alkali metal phosphates with 1,1-diphosphonic acids and their alkali metal slats and/or poly(aldehydocarboxylic acids) and their alkali metal salts.
摘要:
This invention is directed to an aqueous, thixotropic dishwater detergent composition which is at room temperature a paste having a viscosity of at least about 30 Pa.s as measured at 20.degree. C. with a rotational viscometer at 5 spindle revolutions per minute, the dishwasher detergent composition comprising:(a) at least one compound with cleaning action or binding capacity for ions causing hardness selected from the group consisting of polyphosphates, aluminosilicates, silicates, hydroxides, and carbonates of sodium or potassium in an amount sufficient to effect cleaning or binding;(b) an active chlorine compound in an amount sufficient to provide active chlorine to the detergent composition; and(c) a thickener compatible with components (a) and (b) in an amount sufficient to give the desired viscosity.