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now we're going to foerfarande foer framstaellning av crystal silikoaluminat av typ a speciellt typ 4a med kraftig vattenuppsugningsfoermaoga och i haervid erhaollen produkt
now we're going to foerfarande foer framstaellning av crystal silikoaluminat av typ a speciellt typ 4a med kraftig vattenuppsugningsfoermaoga och i haervid erhaollen produkt
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机译:现在我们将要生产具有强吸水形式的4a型特别是4a型铝硅酸盐晶体,
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摘要
1. A process for producing a zeolite of type A with a high water absorption capacity, with an SiO2 / AI2 O3 molar ratio higher than 1.85 and advantageously at least equal to 2, characterized in that : (a) a mixture of solutions of sodium aluminate and silicate is made from a solution of aluminate which is advantageously cooled at from -10 to +10 C, and a solution of silicate, at a temperature such that the temperature of the resulting medium is substantially lower than the ambient temperature, with sufficient agitation being maintained to permit the formation of a homogenous solution having the appearance of a gel and with the molar ratio in the reaction medium being maintained at a value which is at least equal to 1.85 ; (b) the temperature of the reaction medium is raised to a value in the range of from 60 to 100 C ; (c) the medium is maintained at that temperature for a sufficient period of time of from 0.2 to 5 h, so as to cause crystallisation and redispersion of the silicoaluminate in the form of suspension of crystals in the liquid phase, and (d) the resulting crystals are separated and dried.
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机译:1.生产具有高吸水能力,SiO 2 / Al 2 O 3摩尔比高于1.85并且有利地至少等于2的A型沸石的方法,其特征在于:(a)钠溶液的混合物铝酸盐和硅酸盐由铝酸盐溶液和硅酸盐溶液制成,所述铝酸盐溶液有利地在-10℃至+ 10℃下冷却,所述温度使得所得介质的温度显着低于环境温度,并且具有足够的温度。保持搅拌以形成具有凝胶外观的均匀溶液,反应介质中的摩尔比保持在至少等于1.85的值; (b)将反应介质的温度升高至60至100℃的范围内的值; (c)将该介质在该温度下保持0.2至5 h的足够长的时间,以使硅铝酸盐以晶体在液相中的悬浮液形式结晶和再分散,以及(d)分离得到的晶体并干燥。
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