CN105152175A - Method for utilizing waste heat generated in SiO2 aerogel production - Google Patents
Method for utilizing waste heat generated in SiO2 aerogel production Download PDFInfo
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- CN105152175A CN105152175A CN201510577933.1A CN201510577933A CN105152175A CN 105152175 A CN105152175 A CN 105152175A CN 201510577933 A CN201510577933 A CN 201510577933A CN 105152175 A CN105152175 A CN 105152175A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The invention provides a method for utilizing waste heat generated in SiO2 aerogel production. The method comprises the steps of adding 50 parts of a dilute sulphuric acid solution into a vessel; dropwise adding a water glass solution under magnetic stirring until the pH value of the solution system is up to 4.5; dropwise adding 2 parts of a drying control chemical additive (DCCA) and 2 parts of absolute ethyl alcohol, and uniformly stirring; after gelling at normal temperature and aging for 2 hours, adding 50 parts of absolute ethyl alcohol to soak for 10 hours; then, adding 50 parts of n-hexane to soak for 11 hours; mashing wet gel, carrying out suction filtration and washing for many times; then, placing the wet gel into a distillation vessel filled with 150 parts of azeotropic distillation medium, uniformly stirring, and carrying out azeotropic distillation by heating until drying by distillation; and next, placing the obtained product into a blast drying oven, and drying at the temperature of 105 DEG C for 2 hours to obtain SiO2 aerogel powder. A sol-gel/azeotropic distillation method is adopted, so that the coagulation process is short, the coagulation effect is good, the uniformity of a gel structure is good, the structure of SiO2 aerogel can be kept not withered and fragmented, and the prepared product is large in pore volume and high in specific surface area.
Description
Technical field
The present invention relates to aerosil production technical field, particularly relate to residual-heat utilization method in the production of a kind of aerosil.
Background technology
Aerosil is a kind of novel light nano-porous materials grown up this year, and it has translucent and that density is ultralight characteristic.Structurally have that voidage is high, density is low, primary particle is little and the feature such as specific surface area is large, be all used widely in all many-sides such as mechanics, acoustics, calorifics, optics and electricity.
The raw material of synthetic silica aerogel mainly adopts expensive tetraethoxy both at home and abroad at present, dry by adopting supercritical technology.Although adopt Supercritical Drying Technology to reduce surface tension; avoid the micropore atrophy of dried aerogel and dry and cracked; then supercritical process requires harsh to drying conditions; equipment is complicated; obvious burden is all caused to cost and safety; can not continuity and large-scale production, thus limit the application of this drying means.Therefore explore and how to maintain aerosil structure the study hotspot that atrophy and other cracked drying process become domestic and international scientific worker does not occur.
Summary of the invention
Residual-heat utilization method in the object of the present invention is to provide a kind of aerosil to produce, to solve the problems of the technologies described above.
Technical problem to be solved by this invention realizes by the following technical solutions:
Residual-heat utilization method in a kind of aerosil production, it is characterized in that: get 50 parts of (volume) dilution heat of sulfuric acid in container, under magnetic stirring, adopt mode first quick and back slow to drip the water glass solution diluted, until the pH of solution system reaches 4.5, then drip 2 parts of (volume) drying control chemical additive DCCA and 2 part of (volume) dehydrated alcohols, after stirring, be placed in gel under normal temperature, after aging 2 hours, obtain SiO
2wet gel;
50 parts of (volume) dehydrated alcohols are added in the wet gel after aging, soak 10 hours, then add 50 parts of (volume) hexanes, soak 11 hours, wet gel is smashed to pieces, suction filtration also washs for several times, then this wet gel is put into the distil container that 150 parts of (volume) component distillation media are housed, stirs, component distillation is carried out in heating, until evaporate to dryness, then remaining sample is placed in air dry oven in 105 DEG C of dryings 2 hours, obtains SiO
2aerogel powder; Described distil container is connected with holding tank by pipeline, and described install pipeline has interlayer, is provided with prolong in interlayer, and heat is taken away and is used for the preheating of other operation by the cooling fluid in prolong.
Described dilute sulphuric acid is that 98% vitriol oil and water are formulated by the volume ratio of 1:30, and described water glass solution is that industrial waterglass and water are formulated by the volume ratio of 1:2.
Gelation process comprises centrifugal solidifying wadding and leaves standstill solidifying two stages of wadding, centrifugal solidifying wadding 1.5 hours, leave standstill solidifying wadding 0.5 hour, centrifugal solidifying wadding to make container rotation centered by its central shaft, makes the fast rapid hardening wadding of container contents, in container rotation process, rotational velocity adopts the mode hocketed of accelerating and slow down, the maximum value of rotational velocity is 120r/min, and the minimum value of rotational velocity is 25r/min, accelerates to be 5s with the time of moderating process.
This solidifying wadding method, solidifying wadding efficiency can be improved and optimize solidifying wadding effect, under the mating reaction accelerated and be rotated in deceleration, impel gel structure homogenizing, prevent stress during drying cause shrink and dry and cracked, the time that traditional natural coagulates wadding is longer, is unfavorable for enhancing productivity, this solidifying wadding method substantially reduces the solidifying wadding time, improves production efficiency.
The invention has the beneficial effects as follows:
The present invention adopts the method for sol-gel/component distillation, and solidifying wadding process is fast, and solidifying wadding is effective, gel structure good evenness, and can maintain aerosil structure and atrophy and cracked does not occur, the product pore volume prepared is large, specific surface area is high.
Embodiment
The technique means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with specific embodiment, set forth the present invention further, but following embodiment being only the preferred embodiments of the present invention, and not all.Based on the embodiment in embodiment, those skilled in the art under the prerequisite not making creative work obtain other embodiment, all belong to protection scope of the present invention.
Residual-heat utilization method in a kind of aerosil production, get 50 parts of (volume) dilution heat of sulfuric acid in container, under magnetic stirring, adopt mode first quick and back slow to drip the water glass solution diluted, until the pH of solution system reaches 4.5, then drip 2 parts of (volume) drying control chemical additive DCCA and 2 part of (volume) dehydrated alcohols, after stirring, be placed in gel under normal temperature, after aging 2 hours, obtain SiO
2wet gel;
50 parts of (volume) dehydrated alcohols are added in the wet gel after aging, soak 10 hours, then add 50 parts of (volume) hexanes, soak 11 hours, wet gel is smashed to pieces, suction filtration also washs for several times, then this wet gel is put into the distil container that 150 parts of (volume) component distillation media are housed, stirs, component distillation is carried out in heating, until evaporate to dryness, then remaining sample is placed in air dry oven in 105 DEG C of dryings 2 hours, obtains SiO
2aerogel powder;
Gelation process comprises centrifugal solidifying wadding and leaves standstill solidifying two stages of wadding, centrifugal solidifying wadding 1.5 hours, leave standstill solidifying wadding 0.5 hour, centrifugal solidifying wadding to make container rotation centered by its central shaft, makes the fast rapid hardening wadding of container contents, in container rotation process, rotational velocity adopts the mode hocketed of accelerating and slow down, the maximum value of rotational velocity is 120r/min, and the minimum value of rotational velocity is 25r/min, accelerates to be 5s with the time of moderating process;
Above-mentioned dilute sulphuric acid is that 98% vitriol oil and water are formulated by the volume ratio of 1:30, and above-mentioned water glass solution is that industrial waterglass and water are formulated by the volume ratio of 1:2.
More than show and describe ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets is only preference of the present invention; be not used for limiting the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (3)
1. residual-heat utilization method in an aerosil production, it is characterized in that: get 50 parts of (volume) dilution heat of sulfuric acid in container, under magnetic stirring, adopt mode first quick and back slow to drip the water glass solution diluted, until the pH of solution system reaches 4.5, then drip 2 parts of (volume) drying control chemical additive DCCA and 2 part of (volume) dehydrated alcohols, after stirring, be placed in gel under normal temperature, after aging 2 hours, obtain SiO
2wet gel;
50 parts of (volume) dehydrated alcohols are added in the wet gel after aging, soak 10 hours, then add 50 parts of (volume) hexanes, soak 11 hours, wet gel is smashed to pieces, suction filtration also washs for several times, then this wet gel is put into the distil container that 150 parts of (volume) component distillation media are housed, stirs, component distillation is carried out in heating, until evaporate to dryness, then remaining sample is placed in air dry oven in 105 DEG C of dryings 2 hours, obtains SiO
2aerogel powder; Described distil container is connected with holding tank by pipeline, and described install pipeline has interlayer, is provided with prolong in interlayer, and heat is taken away and is used for the preheating of other operation by the cooling fluid in prolong.
2. residual-heat utilization method in aerosil production according to claim 1, it is characterized in that: described dilute sulphuric acid is that 98% vitriol oil and water are formulated by the volume ratio of 1:30, described water glass solution is that industrial waterglass and water are formulated by the volume ratio of 1:2.
3. residual-heat utilization method in aerosil production according to claim 1, it is characterized in that: gelation process comprises centrifugal solidifying wadding and leaves standstill solidifying two stages of wadding, centrifugal solidifying wadding 1.5 hours, leave standstill solidifying wadding 0.5 hour, centrifugal solidifying wadding to make container rotation centered by its central shaft, make the fast rapid hardening wadding of container contents, in container rotation process, rotational velocity adopts the mode hocketed of accelerating and slow down, the maximum value of rotational velocity is 120r/min, the minimum value of rotational velocity is 25r/min, accelerates to be 5s with the time of moderating process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510577933.1A CN105152175A (en) | 2015-09-10 | 2015-09-10 | Method for utilizing waste heat generated in SiO2 aerogel production |
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| CN201510577933.1A CN105152175A (en) | 2015-09-10 | 2015-09-10 | Method for utilizing waste heat generated in SiO2 aerogel production |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1605824A (en) * | 2003-10-08 | 2005-04-13 | 曾维兴 | Drying and pulverizing process for preparing powder material with high dispersibility |
| CN103073008A (en) * | 2013-01-31 | 2013-05-01 | 中国科学技术大学 | Preparation method of silicon dioxide aerogel |
| CN104760964A (en) * | 2015-04-29 | 2015-07-08 | 江西安德力高新科技有限公司 | Silicon dioxide aerogel preparation method |
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2015
- 2015-09-10 CN CN201510577933.1A patent/CN105152175A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1605824A (en) * | 2003-10-08 | 2005-04-13 | 曾维兴 | Drying and pulverizing process for preparing powder material with high dispersibility |
| CN103073008A (en) * | 2013-01-31 | 2013-05-01 | 中国科学技术大学 | Preparation method of silicon dioxide aerogel |
| CN104760964A (en) * | 2015-04-29 | 2015-07-08 | 江西安德力高新科技有限公司 | Silicon dioxide aerogel preparation method |
Non-Patent Citations (2)
| Title |
|---|
| 吴德荣等: "《工业炉及其节能》", 31 March 1990, 机械工业出版社 * |
| 岳瑞丽等: ""Si02气凝胶的溶胶-凝胶／共沸蒸馏法制备及表征"", 《福建师范大学学报》 * |
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Application publication date: 20151216 |