CN102357367B - Method for reducing bulk density of diatomite adopted as sulphuric acid catalyst carrier - Google Patents
Method for reducing bulk density of diatomite adopted as sulphuric acid catalyst carrier Download PDFInfo
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- CN102357367B CN102357367B CN 201110260808 CN201110260808A CN102357367B CN 102357367 B CN102357367 B CN 102357367B CN 201110260808 CN201110260808 CN 201110260808 CN 201110260808 A CN201110260808 A CN 201110260808A CN 102357367 B CN102357367 B CN 102357367B
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- Prior art keywords
- diatomite
- bulk density
- acid catalyst
- catalyst carrier
- sulphuric acid
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 38
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 239000003054 catalyst Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000001117 sulphuric acid Substances 0.000 title abstract description 5
- 235000011149 sulphuric acid Nutrition 0.000 title abstract description 5
- 238000007789 sealing Methods 0.000 claims abstract description 3
- 230000009467 reduction Effects 0.000 claims description 4
- 239000011148 porous material Substances 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000010008 shearing Methods 0.000 abstract 1
- 229910052720 vanadium Inorganic materials 0.000 description 11
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 11
- 239000002689 soil Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000012876 carrier material Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
The invention relates to a method for reducing bulk density of diatomite adopted as a sulphuric acid catalyst carrier. The method comprises: adding diatomite to a high-speed crusher and sealing, wherein the volume of the diatomite is 1/10-1/5 of the volume of the high-speed crusher; after carrying out shearing for 5-20 seconds at a rotation speed of 10000-25000 r/min, taking the diatomite to obtain the product. With the method provided by the present invention, the macroporous proportion is increased, the pore size distribution of the diatomite is improved, the impurities in the pore channels can be removed, such that the bulk density of the diatomite can be significantly reduced, the performance of the domestic diatomite can be effectively improved. In addition, the method has characteristics of simple operation, easy control, low energy consumption and good reproducibility, and the whole microstructure of the diatomite is not damaged.
Description
Technical field
The present invention relates to the material modification field, is exactly that a kind of reduction is as the method for the diatomite bulk density of sulfuric acid catalyst carrier.
Background technology
China is sulfuric acid industry big country, and sulphuric acid output ranks first in the world.One of at present the most frequently used sulfuric acid manufacture method is exactly acid production with sulphur, i.e. SO
2Oxidation generates SO under vanadium catalyst exists
3, then got final product by the dilute sulfuric acid absorption.Wherein vanadium catalyst plays a key effect in whole sulphuric acid process.The most frequently used sulfuric acid catalyst carrier material is diatomite at present, this is because the shell wall that it has special microcellular structure and is made of amorphous silica, these apertures that are distributed on shell wall can be for evenly absorption or coating vanadium catalyst active component provide good condition, it has better permeance property in addition, can obtain larger flow velocity when fluid passes through.The quality of the carrier material diatomite taste of vanadium catalyst directly affects the catalytic performance of vanadium catalyst.In recent years, the Chinese government carries out the protective mining policy for diatomite, causes most of diatomite taste not high, and the vanadium catalyst transformation efficiency of production is low, service life is short, can not satisfy the industry needs, is seriously restricting the production of China's sulfuric acid industry.Therefore, domestic large-scale Sulphuric Acid Enterprises adopts price high import catalyst or diatomite usually, has formed trade monopoly.In order to break World Catalyst or carrier to the monopolization of China's sulfuric acid industry, we are necessary Sudy on Local Diatomites is carried out improved treatment, make it to approach on performance or reach the required desirable index of sulfuric acid catalyst.
Many data have been carried out comparative analysis to domestic soil and import soil, and import diatomite pore-size distribution is wider, and main pore-size distribution is at 0.1-1.5 μ m, and domestic native pore-size distribution is narrower, and main pore-size distribution is at 0.5nm-0.3 μ m.Studies show that, the pore-size distribution of carrier and the performance of vanadium catalyst have important relation.Generally speaking, the measured vanadium catalyst of matter, the aperture proportion that requires to be in 100nm-1000nm is greater than 50%, to guarantee that in catalytic reaction, gas molecule has enough interior diffusion admittances.Under reaction condition, active component is fused solution, and the hole below 100nm is almost entirely occupied by active component and can't provide interior diffusion admittance for gas molecule because the aperture is little, can't realize SO
2Catalytic oxidation, by comparison, the macropore of aperture more than 100nm is not only unobstructed, and rational active surface catalytic oxidation SO can also be provided
2So the characteristics of the measured vanadium catalyst of matter are that pore volume is large, have rational pore-size distribution.According to statistics, in domestic diatomaceous aperture, micropore (less than 1nm) proportion is bigger than normal, mesoporous (1nm-1000nm) and macropore (more than 1000nm) proportion are less than normal, cause pore volume on the low side, bulk density is higher, be unfavorable for the diffusion of reacting gas, do not meet the requirement of high-quality vanadium catalyst carriers, this is the one of the main reasons that the vanadium catalyst transformation efficiency is on the low side, the life-span is shorter take Sudy on Local Diatomites as carrier, therefore, the distribution in change aperture, raising pore volume, reduction bulk density are one of domestic diatomite improved routes.
Diatomite itself is porous material, but many holes of diatom original soil are all stopped up by impurity, and this is a main cause that causes the diatomite bulk density bigger than normal, and diatomite also has very microporous existence in addition, is another reason that causes its bulk density bigger than normal.
Because China also is in the starting stage to diatomaceous exploitation, also less for diatomite theoretical research and application study, up to the present also there is no the effective method that can significantly reduce the diatomite bulk density.
Summary of the invention
The purpose of this invention is to provide a kind of efficient convenient remarkable reduction as the method for the diatomite bulk density of sulfuric acid catalyst carrier.
Technical solution problem of the present invention adopts following technical scheme:
A kind of method that reduces as the diatomite bulk density of sulfuric acid catalyst carrier is characterized in that: diatomite is put into high speed disintegrator, and sealing, is taken out diatomite and is namely got product after second at the rotating speed down cut 5-20 of 10000-25000r/min.
Described diatomite volume is 1/10th to 1/5th of high speed disintegrator volume.
Beneficial effect of the present invention is:
1, utilize the high speed shear technology, diatomite is carried out improved treatment, the high-speed rotary change of team brings powerful centrifugal force on the one hand, the impurity in its hole can be cleared, and dredges the duct; Shear on the other hand and do not destroy diatomaceous whole pattern in the short time, and make its part micropore be broken into larger hole, make its aperture become large, effect by this two aspect, can increase the macropore ratio, improve the diatomite pore-size distribution, again can be with Impurity removal in the duct, thereby can significantly reduce the diatomite bulk density, can effectively improve the Sudy on Local Diatomites performance;
2, easy and simple to handle, be easy to control, energy consumption is low, favorable reproducibility;
3, do not destroy diatomaceous whole microstructure.
Description of drawings:
Fig. 1 is embodiment 1 makes product under different shear times bulk density variation diagram.
The specific embodiment
Embodiment 1, referring to Fig. 1, take diatom original soil 2g, put into the high speed disintegrator of 300ml capacity, good seal at 24000r/min rotating speed down cut approximately after 5s, takes out diatomite and gets final product, the diatomaceous bulk density of gained is 0.17g/ml
Embodiment 2, take diatom original soil 20g, put into the high speed disintegrator of 3000ml capacity, good seal at 20000r/min rotating speed down cut approximately after 10s, takes out diatomite and gets final product, and the diatomaceous bulk density of gained is 0.2g/ml.
Claims (2)
1. a reduction as the method for the diatomite bulk density of sulfuric acid catalyst carrier, is characterized in that: diatomite is put into high speed disintegrator, and sealing, is taken out diatomite and is namely got product after second at the rotating speed down cut 5-20 of 10000-25000r/min.
2. method according to claim 1, is characterized in that described diatomite volume is 1/10th to 1/5th of high speed disintegrator volume.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110260808 CN102357367B (en) | 2011-09-06 | 2011-09-06 | Method for reducing bulk density of diatomite adopted as sulphuric acid catalyst carrier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110260808 CN102357367B (en) | 2011-09-06 | 2011-09-06 | Method for reducing bulk density of diatomite adopted as sulphuric acid catalyst carrier |
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| Publication Number | Publication Date |
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| CN102357367A CN102357367A (en) | 2012-02-22 |
| CN102357367B true CN102357367B (en) | 2013-05-15 |
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| CN 201110260808 Expired - Fee Related CN102357367B (en) | 2011-09-06 | 2011-09-06 | Method for reducing bulk density of diatomite adopted as sulphuric acid catalyst carrier |
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| CN105126861A (en) * | 2015-09-07 | 2015-12-09 | 吉林省天元硅藻科技有限公司 | Sulfuric acid catalyst prepared through middle and low temperature hydrogen sulfide wetting method and preparation method therefor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101920214A (en) * | 2010-07-27 | 2010-12-22 | 中国科学院等离子体物理研究所 | Method for modifying kieselguhr sulfuric acid catalyst carrier |
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| ES2835176T3 (en) * | 2007-11-25 | 2021-06-22 | Imerys Filtration Minerals Inc | Process for the preparation of filter aids, made from low permeability diatomaceous earth |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101920214A (en) * | 2010-07-27 | 2010-12-22 | 中国科学院等离子体物理研究所 | Method for modifying kieselguhr sulfuric acid catalyst carrier |
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Address after: 230031 Shushan Lake Road, Anhui, China, No. 350, No. Applicant after: HEFEI INSTITUTES OF PHYSICAL SCIENCE, CHINESE ACADEMY OF SCIENCES Address before: 230031 Shushan Lake Road, Anhui, China, No. 350, No. Applicant before: HEFEI INST PHYSICAL SCI CAS |
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