WO2018019179A1 - 一种超微孔纳米SiO2的制法 - Google Patents

一种超微孔纳米SiO2的制法 Download PDF

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WO2018019179A1
WO2018019179A1 PCT/CN2017/093772 CN2017093772W WO2018019179A1 WO 2018019179 A1 WO2018019179 A1 WO 2018019179A1 CN 2017093772 W CN2017093772 W CN 2017093772W WO 2018019179 A1 WO2018019179 A1 WO 2018019179A1
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inorganic acid
solution
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sio
acid solution
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汪承源
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
    • C01B33/186—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof from or via fluosilicic acid or salts thereof by a wet process
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
    • C01B33/187—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates
    • C01B33/193—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates of aqueous solutions of silicates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
    • C01B33/146—After-treatment of sols
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/12—Surface area
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/16—Pore diameter
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/80—Compositional purity
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/90—Other properties not specified above

Definitions

  • the invention relates to the field of preparation of nano materials, in particular to a method for preparing ultramicroporous nano SiO 2 .
  • Precipitation method is a common method for producing this product at home and abroad.
  • this method has a large area and a long construction period. Specifically, quartz sand and alkali are melted at high temperature to synthesize solid sodium silicate, which is adjusted by the solubility of metal salt or alkali. The acidity, temperature and solvent of the solution are precipitated, and then the precipitate is washed, dried and heat-treated to form an ultrafine powder; the product obtained by the method has low purity, small specific surface area, wide distribution range and large particle size.
  • the original particle size of the product is 33-47 ⁇ m.
  • the product After mechanical pulverization, the product has a particle size of 10-15 ⁇ m, low porosity and specific surface area of 190m 2 /g, which cannot meet the requirements of rubber product filler.
  • Another conventional method is a gas phase method, specifically using silicon tetrachloride as a raw material, and obtaining a product by a process such as thermal cracking decomposition, agglomeration, deacidification, etc.; although the product produced by the gas phase method is very fine, the yield is low and the raw material is expensive.
  • the equipment requirements are high, the production process is long, the energy consumption is large, a large amount of toxic gas is generated in the reaction, the environment is seriously polluted, and it is not suitable for industrial production.
  • There are many other preparation methods for other nano-SiO 2 powders including mechanical pulverization, sol-gel method, super-gravity method, micro-emulsion method, etc., but these methods have certain defects.
  • the prior patent CN1048956C reports the preparation method of secondary crystalline ultrafine white carbon black, which adopts a secondary crystallization method, wherein primary crystallization refers to a silica sol crystal formed by agglomerating a catalyst inorganic acid and a silica sol, and secondary crystallization means
  • primary crystallization refers to a silica sol crystal formed by agglomerating a catalyst inorganic acid and a silica sol
  • secondary crystallization means The crystal of the dispersed sponge-like silica sol formed by the above primary crystallization is neutralized and hydrolyzed under the control of temperature, acceleration, stirring speed and pH as a seed crystal, and is formed as a secondary with sodium silicate, atomized inorganic acid and water.
  • the crystal white carbon black is washed and dried by rapid cooling to obtain an ultrafine white carbon black product.
  • the method of the invention has high equipment cost, large floor space, slow reaction speed, consumes a large amount of water resources and gas fuel energy, and gas combustion generates a large amount of carbon dioxide, resulting in a greenhouse effect, and the nano-scale material in the product is only 50%.
  • the invention solves the deficiencies in all the above technical problems, reduces production cost, saves resources, saves energy, protects the environment, improves product quality, and provides a simpler process, lower production cost, excellent activity and adsorption rate, and dispersion.
  • the present invention provides a method for preparing ultramicroporous nano SiO 2 comprising the following steps:
  • microchannel reaction is completed, uniformly discharged, and sent to a high temperature spray drying tower by a rotary spray to perform splitting and drying. At this time, the microchannel reaction product is atomized and then subjected to high temperature contact splitting and drying, and an ultrafine is formed instantaneously. Pore particle
  • the inorganic acid is a mixture of one or more of hydrochloric acid, sulfuric acid, nitric acid, and phosphoric acid.
  • the stirring is mechanical agitation at a rotational speed of 1000-2000 rpm, wherein 1500 rpm is divided into an optimum rotational speed.
  • the input amount of the 30-50% sodium silicate solution and the 20-40% inorganic acid solution is adjusted according to the pH value, and the microchannel reaction controls the pH value to be 5-9, wherein the optimal pH is The value of the microchannel reaction time is 1-10 min, the optimal reaction time is 1-2 min; the optimal heating temperature of the microchannel reactor is 100 ° C; the inorganic acid solution is adjusted by the acid pump The flow is controlled at a speed to achieve automated control in the microchannel reactor.
  • the spray drying tower is controlled at a temperature of 500 to 1200 ° C, wherein an optimum temperature is 800 ° C.
  • the rotational speed is controlled at a speed of 3000-5000 rpm, wherein the optimum rotational speed is 4000 rpm.
  • the raw material of the invention is low in cost, fast in reaction rate, short in production cycle, simple and easy to carry out.
  • the method of the invention omits the washing process and no longer consumes a large amount of water resources.
  • Excellent product performance, insoluble in water and acid, stable in chemical properties, high in temperature resistance, good in electrical insulation performance, excellent in activity and adsorption rate, good in dispersion performance, better in optical and mechanical properties, and the original particle size of the product can be Up to 0.1-1 ⁇ m, specific surface area up to 600m 2 /g, internal pores, tensile strength can reach 320Mpa, the proportion of nano-scale materials in the product is not less than 85%.
  • the ultra-microporous nano-SiO 2 of the invention has strong affinity with various rubbers, and the silanol group on the surface of the ultra-microporous nano-SiO 2 plays a cross-linking role in the rubber vulcanization process, and produces a prominent reinforcing effect, for example, adding As a tire reinforcing agent, filler and anti-wear agent in the tire, it can increase the life of the tire by 6-8 times and ensure safe driving.
  • the ultra-microporous nano SiO 2 of the invention is widely used in catalyst carrier, polymer composite material, electronic packaging material, precision ceramic material, rubber, paper making, plastic, paint, ink, paper, glass steel, binder High-grade fillers, sealants, coatings, optical fibers, precision casting and many other industrial products have special excellent effects.
  • Figure 1 is a block diagram of the process flow of the present invention.
  • Embodiment 1 with reference to Figure 1, a method for preparing ultramicroporous nano SiO 2 , comprising the following steps:
  • the sol solution is put into a microchannel reactor, and a 40% sodium silicate solution and a 28% inorganic acid solution are introduced into the microchannel reactor to adjust the temperature of the microchannel reactor to a temperature of 100 ° C.
  • a 40% sodium silicate solution and a 28% inorganic acid solution are introduced into the microchannel reactor to adjust the temperature of the microchannel reactor to a temperature of 100 ° C.
  • microchannel reaction is completed, uniformly discharged, and sent to a high temperature spray drying tower by a rotary spray to perform splitting and drying. At this time, the microchannel reaction product is atomized and then subjected to high temperature contact splitting and drying, and an ultrafine is formed instantaneously. Pore particle
  • the mineral acid is sulfuric acid.
  • the agitation was mechanical agitation at a rotational speed of 1500 r/min.
  • the input amount of the 40% sodium silicate solution and the 20% inorganic acid solution is adjusted according to the pH; the microchannel reaction control pH is 6.5-7; the microchannel reaction time is 1-2 min;
  • the inorganic acid solution controls the flow rate by an acid pump stepless speed regulation, and realizes automatic control in the microchannel reactor.
  • the spray drying tower was controlled at a temperature of 800 °C.
  • the rotational speed is controlled at 4000 r/min.
  • Embodiment 2 in conjunction with FIG. 1, a method for preparing ultramicroporous nano SiO 2 , comprising the following steps:
  • the sol solution is put into a microchannel reactor, and a 45% sodium silicate solution and a 25% inorganic acid solution are introduced into the microchannel reactor to adjust the temperature of the microchannel reactor to a temperature of 110 ° C.
  • microchannel reaction is completed, uniformly discharged, and sent to a high temperature spray drying tower by a rotary spray to perform splitting and drying. At this time, the microchannel reaction product is atomized and then subjected to high temperature contact splitting and drying, and an ultrafine is formed instantaneously. Pore particle
  • the mineral acid is sulfuric acid.
  • the agitation was mechanical agitation at a rotational speed of 1500 r/min.
  • the input amount of the 40% sodium silicate solution and the 20% inorganic acid solution is adjusted according to the pH; the microchannel reaction control pH is 6.5-7; the microchannel reaction time is 1-2 min;
  • the inorganic acid solution controls the flow rate by an acid pump stepless speed regulation, and realizes automatic control in the microchannel reactor.
  • the spray drying tower was controlled at a temperature of 1000 °C.
  • the rotational speed is controlled at 4000 r/min.
  • the technical specifications of the ultramicroporous nano SiO 2 prepared by the method of the invention are as follows:
  • the products invented in this embodiment meet the technical requirements of the Class A products of the national standard GB10517-89 and the technical conditions of the chemical industry standard HG/T2197-91, all of which meet the standards and are superior to the standards.
  • the final result of the product of the invention far exceeds the national standard and the international standard, and is by far the best product of the ultramicroporous nano SiO 2 in the world.

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  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Silicon Compounds (AREA)

Abstract

提供一种超微孔纳米SiO 2的制法，包括：a)将10000升15-20％无机酸溶液投入15000升含40-45％二氧化硅的硅溶胶中，搅拌至硅溶胶均匀分散于无机酸溶液中，得溶胶溶液；b)将溶胶溶液投入微通道反应器中，并向微通道反应器中通入30-50％硅酸钠溶液和20-40％无机酸溶液，调节微通道反应器加热控温80-120℃进行微通道反应；c)待微通道反应完全，均匀放料并以旋转喷雾方式输送至高温喷雾干燥塔中进行分裂干燥，此时微通道反应产物雾化后经高温接触分裂干燥，瞬间即形成超微孔颗粒；d)将超微孔颗粒旋风分级，收尘，即得超微孔纳米SiO 2。该方法生产成本低、工艺简单，获得的超微孔纳米SiO 2具有优良活性度和吸附率、分散性能好、比表面积大、内部孔隙多的优点。

Description

一种超微孔纳米SiO2的制法 技术领域
本发明涉及纳米材料制备领域，具体是一种超微孔纳米SiO2的制法。
背景技术
著名科学家钱学森曾预言：“纳米科技是21世纪发展的重点，会是一次技术革命，而且还是一次产业革命”。从上世纪开始，纳米材料这门前瞻性、战略性、基础性科学，已引起世界各国众多学者、专家、科学家、企业家、高层领导的广泛关注与重视。我国在上世纪80年代将纳米科学列入国家863计划和国家自然基金项目，投资上亿元用于项目研究，但我国的纳米技术与欧美等国差距很大。各种资料显示人们惊叹于纳米材料的神奇，各国科学家和技术人才也积极投入研究行列，尤其是SiO2材料的超纯超细纳米化的研究更是热门课题。
到目前为止国际上使用的传统技术主要是沉淀法和气相法。沉淀法是当前国内外生产该产品的普遍方法，但此方法占地面积大，建厂周期长，具体是将石英砂和碱高温熔融合成固体硅酸钠，利用金属盐或碱的溶解度，调节溶液酸度、温度、溶剂，使其产生沉淀，然后对沉淀物进行洗涤、干燥、热处理制成超细粉体；该方法制得的产品纯度低，比表面积小，分布范围宽，粒径大，产品原始粒径为33-47μm，经机械粉碎后产品粒径为10-15μm，孔隙率低，比表面积为190m2/g，不能满足作为橡胶制品填料的要求。另一种传统方法是气相法，具体以四氯化硅为原料，经热裂燃烧分解、聚集、脱酸等工艺得到产品；气相法生产的产品虽然颗粒很细，但产量很低，原料昂贵，设备要求高，生产流程长，能耗大，在反应中产生大量有毒气体，严重污染环境，不适合工业化生产。其他纳米SiO2粉体的制备方法还有很多，包括机械粉碎法、溶胶凝胶法、超重力法、微乳液法等，但是这些方法都存在着一定的缺陷。
现有专利CN1048956C报道了二次结晶超细白炭黑的制法，采用二次结晶方法，其中一次结晶是指由催化剂无机酸与硅溶胶凝聚而成的硅溶胶结晶体，二次结晶是指以上述一次结晶所形成的分散海绵状硅溶胶结晶体作为晶种，与硅酸钠、雾化无机酸和水，在控制温度、加速度、搅拌速度和pH值下，进行中和、水解形成作为二次结晶体的白炭黑，再经快速冷却洗涤、干燥得超细白炭黑产品。但此发明方法设备成本过高，占地面积大，反应速度慢，消耗大量水资源及燃气燃料能源，且燃气燃烧会产生大量二氧化碳，造成温室效应，产品中纳米级材料也仅有50％。
发明内容
本发明解决上述所有技术问题中的不足，降低生产成本，节省资源，节约能源，保护环境，提高产品质量，提供了一种工艺更简单，生产成本更低廉，具有优良活性度和吸附率、分散性能好、比表面积大、内部孔隙多、用途更加广泛的超微孔纳米SiO2制造方法。
为实现本发明目的，本发明提供了一种超微孔纳米SiO2的制法，包括以下步骤：
a)将10000升15-20％无机酸溶液投入15000升含40-45％二氧化硅的硅溶胶中，搅拌至硅溶胶均匀分散于无机酸溶液中，得溶胶溶液；
b)将所述溶胶溶液投入微通道反应器中，并向所述微通道反应器中通入30-50％硅酸钠溶液和20-40％无机酸溶液，调节上述微通道反应器加热控温80-120℃进行微通道反应；
c)待所述微通道反应完全，均匀放料并以旋转喷雾方式输送至高温喷雾干燥塔中进行分裂干燥，此时上述微通道反应产物雾化后经高温接触分裂干燥，瞬间即形成超微孔颗粒；
d)将所述超微孔颗粒旋风分级，收尘，即得超微孔纳米SiO2。
进一步地，所述无机酸是盐酸、硫酸、硝酸、磷酸中一种或多种按比例混合。
进一步地，在所述a)步骤中搅拌为机械搅拌，转速为1000-2000转/分，其中1500转/分为最佳转速。
进一步地，在所述b)步骤中30-50％硅酸钠溶液和20-40％无机酸溶液输入量根据pH值调整，所述微通道反应控制pH值为5-9，其中最佳pH值为6.5-7；所述微通道反应时间为1-10min，最佳反应时间为1-2min；所述微通道反应器最佳加热温度为100℃；所述无机酸溶液用酸泵无极调速控制流量，在所述微通道反应器中实现自动化控制。
进一步地，在所述c)步骤中喷雾干燥塔控温500-1200℃，其中最佳温度为800℃。
进一步地，在所述c)步骤中旋转速度控速3000-5000转/分，其中最佳转速为4000转/分。
本发明与现有技术相比具有突出显著优点：
1、本发明原料低廉，反应速率快，生产周期短，简单易行。
2、选择目前国际上微通道反应新型设备，更替了占地面积大的大型搪玻璃反应釜，废弃了燃煤、燃气的大型锅炉，投资设备费用降低了三分之一，大大降低了生产成本。
3、节省水资源，本发明方法省略了洗涤过程，不再耗费大量水资源。
4、节约能源，不用锅炉，不需要燃煤、燃气，不需要蒸气进行热交换。
5、整个生产工艺流程中无废水、废气、废渣排放，环境友好无污染，更适合工业化生产。
6、产品性能优异，不溶于水和酸，化学性质稳定，耐高温，电绝缘性能良好，具有优良的活性度和吸附率，分散性能好，光学性能和机械性能更加优良，产品原始粒径可达0.1-1μm，比表面积可达600m2/g，内部孔隙多，拉伸强度可达到320Mpa，产品中纳米级材料比重不小于85％。
7、本发明超微孔纳米SiO2与各种橡胶都有极强亲和力，超微孔纳米SiO2表面的硅醇基在橡胶硫化过程中起到交联作用，产生突出补强效果，例如添加在轮胎中作为轮胎补强剂、填充剂和耐磨剂，能使轮胎寿命提高6-8倍，保证行驶安全。
8、应用范围广，本发明超微孔纳米SiO2广泛用于催化剂载体、高分子复合材料、电子封装材料、精密陶瓷材料、橡胶、造纸、塑料、油漆、油墨、造纸、玻璃钢、粘结剂、高档填料、密封胶、涂料、光导纤维、精密铸造等诸多行业产品中，具有特殊优良效果。
附图说明
图1是本发明工艺流程方块图。
具体实施方式
下面结合附图对本发明做进一步的详细说明。
实施例1，结合附图1，一种超微孔纳米SiO2的制法，包括以下步骤：
a)将10000升20％无机酸溶液投入15000升含40％二氧化硅的硅溶胶中，搅拌至硅溶胶均匀分散于无机酸溶液中，得溶胶溶液；
b)将所述溶胶溶液投入微通道反应器中，并向所述微通道反应器中通入40％硅酸钠溶液和28％无机酸溶液，调节上述微通道反应器加热控温100℃进行微通道反应；
c)待所述微通道反应完全，均匀放料并以旋转喷雾方式输送至高温喷雾干燥塔中进行分裂干燥，此时上述微通道反应产物雾化后经高温接触分裂干燥，瞬间即形成超微孔颗粒；
d)将所述超微孔颗粒旋风分级，收尘，即得超微孔纳米SiO2。
所述无机酸是硫酸。在所述a)步骤中搅拌为机械搅拌，转速为1500r/min。在所述b)步骤中40％硅酸钠溶液和20％无机酸溶液输入量根据pH值调整；所述微通道反应控制pH值为6.5-7；所述微通道反应时间为1-2min；所述无机酸溶液用酸泵无极调速控制流量，在所述微通道反应器中实现自动化控制。在所述c)步骤中喷雾干燥塔控温800℃。在所述c)步骤中旋转速度控速4000r/min。
实施例2，结合附图1，一种超微孔纳米SiO2的制法，包括以下步骤：
a)将10000升18％无机酸溶液投入15000升含45％二氧化硅的硅溶胶中，搅拌至硅溶胶均匀分散于无机酸溶液中，得溶胶溶液；
b)将所述溶胶溶液投入微通道反应器中，并向所述微通道反应器中通入45％硅酸钠溶液和25％无机酸溶液，调节上述微通道反应器加热控温110℃进行微通道反应；
c)待所述微通道反应完全，均匀放料并以旋转喷雾方式输送至高温喷雾干燥塔中进行分裂干燥，此时上述微通道反应产物雾化后经高温接触分裂干燥，瞬间即形成超微孔颗粒；
d)将所述超微孔颗粒旋风分级，收尘，即得超微孔纳米SiO2。
所述无机酸是硫酸。在所述a)步骤中搅拌为机械搅拌，转速为1500r/min。在所述b)步骤中40％硅酸钠溶液和20％无机酸溶液输入量根据pH值调整；所述微通道反应控制pH值为6.5-7；所述微通道反应时间为1-2min；所述无机酸溶液用酸泵无极调速控制流量，在所述微通道反应器中实现自动化控制。在所述c)步骤中喷雾干燥塔控温1000℃。在所述c)步骤中旋转速度控速4000r/min。
本发明方法所制得的超微孔纳米SiO2技术指标如下：
Figure PCTCN2017093772-appb-000001
本实施例发明的产品符合国家标准GB10517-89中A类产品技术要求和化工行标HG/T2197-91技术条件，全部指标达到标准，且优于标准。
本发明项目产品最终结果远远超过国家标准及国际标准，到目前为止是世界上超微孔纳米SiO2最好的产品。
当然，上述说明并非是对本发明的限制，本发明也并不限于上述举例，本技术领域的普通技术人员，在本发明的实质范围内，作出的变化、改变、添加或替换，都应属于本发明的保护范围。

Claims (6)

  1. 一种超微孔纳米SiO2的制法，其特征在于，包括以下步骤：
    a)将10000升15-20％无机酸溶液投入15000升含40-45％二氧化硅的硅溶胶中，搅拌至硅溶胶均匀分散于无机酸溶液中，得溶胶溶液；
    b)将所述溶胶溶液投入微通道反应器中，并向所述微通道反应器中通入30-50％硅酸钠溶液和20-40％无机酸溶液，调节上述微通道反应器加热控温80-120℃进行微通道反应；
    c)待所述微通道反应完全，均匀放料并以旋转喷雾方式输送至高温喷雾干燥塔中进行分裂干燥，此时上述微通道反应产物雾化后经高温接触分裂干燥，瞬间即形成超微孔颗粒；
    d)将所述超微孔颗粒旋风分级，收尘，即得超微孔纳米SiO2。
  2. 根据权利要求1所述的超微孔纳米SiO2的制法，其特征在于，所述无机酸是盐酸、硫酸、硝酸、磷酸中一种或多种按比例混合。
  3. 根据权利要求1所述的超微孔纳米SiO2的制法，其特征在于，在所述a)步骤中搅拌为机械搅拌，转速为1000-2000r/min。
  4. 根据权利要求1所述的超微孔纳米SiO2的制法，其特征在于，在所述b)步骤中30-50％硅酸钠溶液和20-40％无机酸溶液输入量根据pH值调整；所述微通道反应控制pH值为5-9；所述微通道反应时间为1-10min；所述无机酸溶液用酸泵无极调速控制流量，在所述微通道反应器中实现自动化控制。
  5. 根据权利要求1所述的超微孔纳米SiO2的制法，其特征在于，在所述c)步骤中喷雾干燥塔控温500-1200℃。
  6. 根据权利要求1所述的超微孔纳米SiO2的制法，其特征在于，在所述c)步骤中旋转速度控速3000-5000r/min。
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