摘要:
The synthesis of zeolites 4A having a high crystallinity and a fine granulometry is disclosed, by the addition in a first stage of a sodium silicate solution to a sodium aluminate solution (containing an excess of NaOH and heated to a temperature of from 50.degree. to 100.degree. C.), and by the crystallization in a second stage at a temperature of from 70.degree. to 105.degree. C., characterized in that the temperature of the sodium silicate solution is lower by at least twenty Centigrade degrees than that of the sodium aluminate solution, the molar ratios SiO.sub.2 :H.sub.2 O and SiO.sub.2 :Na.sub.2 O in the sodium silicate solution being respectively from 0.030 to 0.150 and from 1.95 to 2.30, and the weight ratio between the reaction mother liquor and the zeolite thus formed being from 6.5 to 20.
摘要:
Synthetic crystalline alumino-silicate zeolites are prepared by combining reactant quantities of alumina, silica, sodium hydroxide and water with zeolite-forming alumino-silicate seeds having the composition 16 Na.sub.2 O: 2 to 9 Al.sub.2 O.sub.3 : 15 SiO.sub.2 : 500 to 2000 H.sub.2 O. The seed compositions may be used to produce Type A, X and Y crystalline alumino-silicate zeolites.
摘要翻译:合成的结晶铝硅酸盐沸石通过将氧化铝,二氧化硅,氢氧化钠和水的反应物量与沸石形成的铝硅酸盐种子组合而制备,所述沸石形成铝硅酸盐种子具有组成16Na 2 O:2至9 Al 2 O 3:15SiO 2:500至2000H 2 O。 种子组合物可用于生产A型,X型和Y型结晶铝硅酸盐沸石。
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:
In the manufacture of zeolite A crystals, characterized by a size in the range of about 1 to about 10 .mu.m (micrometers or microns) the crystal size is controlled to within the range of .+-. 1 .mu.m by seeding a sodium aluminum silicate gel that is free of nucleating particles with a predetermined number of comminuted zeolite A crystals having a number average particle size less than about 0.5 .mu.m.
摘要:
Crystalline 4A zeolites having high calcium ion exchange capacity, well adapted as builder materials for detergent compositions, are prepared by directly admixing an aqueous sodium silicate solution with a first aqueous sodium aluminate solution in a first reaction vessel to form a hydrogel therefrom, and transferring the hydrogel thus formed to a discrete crystallization zone and therein contacting such hydrogel with a crystallization-effecting amount of a second aqueous sodium aluminate solution to convert same into a crystalline 4A zeolite, and, advantageously, filtering, washing and optionally drying such crystalline 4A zeolite.
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:
A process for continuous preparation of zeolite A of constant and homogeneous quality, consisting of instantly and continously mixing a sodium silicate solution and a sodium aluminate solution in the correct proportions and at an elevated temperature followed by transfer of the resulting slurry to a crystallization reactor. The product is recovered from the crystallization reactor washed and dried.
摘要:
A method for the preparation of finely-divided, water-insoluble, aluminosilicate cation-exchangers with a narrow particle size spectra suitable for detergent formulations comprising:(1) agitating a water-dissolved alkali metal silicate at a temperature of from 55.degree. C. to 95.degree. C.(2) mixing therewith at a temperature of from 55.degree. C. to 95.degree. C. over a period of from three seconds to five minutes with vigorous agitation, a water-dissolved alkali metal aluminate, in the presence of an excess of alkali to give a suspension of a silicate compound containing bound water and having a calcium binding power, when measured at 22.degree. C. by the Calcium Binding Power Test Method, of at least 50 mg CaO/gm of anhydrous active substance, and having the formula, bound water not shown,(M.sub.2 O).sub.0.8-1.3.Al.sub.2 O.sub.3.(SiO.sub.2).sub.1.75-2.0 wherein M represents an alkali metal, wherein said reactant solutions when mixed have a composition corresponding to the desired Al.sub.2 O.sub.3 and SiO.sub.2 amounts of the above formula, with a ratio of from 3.2 to 4.4 mols M.sub.2 O/mol Al.sub.2 O.sub.3 and a ratio of from 70 to 85 mols of water/mol Al.sub.2 O.sub.3,(3) maintaining said silicate compound suspension after said mixing step is completed, for a period of from two to twenty minutes under the agitation and temperature conditions of said mixing step,(4) rapidly heating said silicate compound suspension at least 5.degree. C. above the temperature of said mixing step to a temperature of from 60.degree. C. to 100.degree. C.,(5) allowing said silicate compound suspension to crystallize at said elevated temperature of from 60.degree. C. to 100.degree. C. while agitating sufficiently to keep said suspension flowable,(6) adjusting said crystalline silicate compound suspension to a pH of below 12.5, and(7) recovering said crystalline silicate compound.
摘要翻译:一种制备具有适用于洗涤剂配方的窄粒度光谱的细分散的水不溶性铝硅酸盐阳离子交换剂的方法,包括:(1)在55℃的温度下搅拌水溶性碱金属硅酸盐 至95℃。(2)在剧烈搅拌下,在三分钟至五分钟的时间内,在55℃至95℃的温度下混合,在水溶性的碱金属铝酸盐存在下, 过量的碱使得含有结合水并具有钙结合力的硅酸盐化合物的悬浮液,当在22℃下通过钙结合力测试方法测量至少50mg CaO / gm的无水活性物质时, 具有下式的结合水(M 2 O)0.8-1.3.Al 2 O 3(SiO 2)1.75-2.0其中M表示碱金属,其中所述反应物溶液在混合时具有对应于所需Al 2 O 3和SiO 2量的组成 上面的公式,用 3.2〜4.4摩尔M 2 O /摩尔Al 2 O 3的比例和70〜85摩尔的水/摩尔Al 2 O 3的比例,(3)在所述混合步骤之后保持所述硅酸盐化合物悬浮液的时间为2〜20秒 在所述混合步骤的搅拌和温度条件下分钟,(4)将所述硅酸盐化合物悬浮液在所述混合步骤的温度下快速加热至少5℃至60℃至100℃, 5)允许所述硅酸盐化合物悬浮液在60℃至100℃的所述升高温度下结晶,同时充分搅拌以保持所述悬浮液可流动,(6)将所述结晶硅酸盐化合物悬浮液调节至pH低于12.5, (7)回收所述结晶硅酸盐化合物。
摘要:
Plastic compositions which contain zeolite particles as fillers which have particle sizes of no more than 2.2 microns in diameter with at least 90 percent of the weight of the particles being between 0.1 and 5.0 microns in diameter.
摘要:
Rubber compositions which contain zeolite particles having particle sizes of no more than 1.6 microns in diameter with at least 90% of the weight of the particles being between 0.1 and 3.2 microns in diameter, a binding agent, water, and a solubilizing agent.