CN100435943C - Silver-electrolyzing catalyst composition and silver-electrolyzing catalyst bed - Google Patents
Silver-electrolyzing catalyst composition and silver-electrolyzing catalyst bed Download PDFInfo
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- CN100435943C CN100435943C CNB2007100649178A CN200710064917A CN100435943C CN 100435943 C CN100435943 C CN 100435943C CN B2007100649178 A CNB2007100649178 A CN B2007100649178A CN 200710064917 A CN200710064917 A CN 200710064917A CN 100435943 C CN100435943 C CN 100435943C
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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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Abstract
The invention discloses an electrolytic silver catalyst composition, which is composed of the fiber type electrolytic silver and crystal electrolytic silver, the weight ratio of two points is 10-35: 65-90, of which, the particles of crystal electrolysis silver is 8-24 head, the particles of fiber type electrolytic silver is 32-40 head, the catalyst bed is formed by electrolytic silver composition, including crystal electrolytic silver layer and fiber silver electrolysis layer and a catalyst layer, the two layer parallel setting from down to up, the down surface of catalyst layer set with silk screen. This invention's product life extend 25% compared with existing products, the existing fiber-electrolytic silver catalyst life is 45 days, and use this invention of electrolytic silver catalyst to produce at least 60 consecutive days; Furthermore, the catalyst layer of the invention products increased resistance rate relieve considerably, reduced Blower power, saving power consumption, and improved the capacity of the device.
Description
Technical field
The present invention relates to a kind of silver catalyst, particularly a kind of catalyst for electrolytic silver composition and catalyst for electrolytic silver bed that is used to prepare formaldehyde.
Background technology
Formaldehyde is one of primary raw material of preparation adhesion agent for artificial board such as Lauxite, its main processes is to make methyl alcohol, air and steam mix the evaporation preheating by a certain percentage to enter oxidation reactor, oxidative dehydrogenation generation formaldehyde gas takes place in mist on beds under normal pressure and 600-650 ℃ of temperature conditions, obtain certain density formaldehyde products through absorption, therefore the quality of formaldehyde quality, the height of output depend on the quality and the stability of catalyst to a great extent.
Making by the methanol oxidation dehydrogenation in the process of formaldehyde, the catalyst of employing mainly contains three kinds: float stone silver, electrolytic silver and iron and molybdenum oxides.In recent years, owing to compare with iron and molybdenum oxides with float stone silver, electrolytic silver has that making is simple, easy to use, excellent catalytic effect advantages such as (, formaldehyde conversion ratio height good as selectivity) and obtained extensive use.
At present, prepare at methanol oxidation that normally used catalyst for electrolytic silver is that a kind of purity is at the fibrous type catalyst for electrolytic silver more than 99.99% in the course of reaction of formaldehyde, because having, it makes simply, the advantage that cost is low and being used widely, as shown in Figure 1, its main preparation technology is: in the once electrolytic groove with platinum bar or titanium plate as anode, is to carry out redox reaction under the 7A/ square decimeter in concentration for the 4-5% current density, electrolysis temperature is at 50～55 ℃, separate out the electrolytic silver of purification on the negative electrode, regularly the electrolytic silver of separating out is scraped off, deliver to the raw material of re-electrolysis groove as its anode.Under current density is 55～60 ℃ of 14A/ square decimeter and electrolyte temperature, proceed electrolysis for the second time, separate out loose electrolytic silver on the negative electrode, regularly the electrolytic silver of separating out is scraped off to be placed on and carries out submergence in the distilled water and clean.When treating that re-electrolysis silver is collected constant weight, carry out distilled water washing, suction filtration for several times, in check filtrate till the no silver ion, and continuation subsequent processing: as drying, heat treatment, granulation, screening, stepping, finished product packing are put dry place and are preserved, for the needs on producing.
Though this high-purity fibrous type catalyst for electrolytic silver structure is more open, specific area and porosity are bigger, therefore reactivity is good, formaldehyde conversion ratio height (more than 96.5%), but, because its degree of crystallinity is lower, there is certain amorphous region, therefore do not have certain shape, bad mechanical strength needs manual granulation, and melting range is longer, easy sintering, cause methyl alcohol deep oxidation and unstripped gas short circuit thus, air resistance is big, usually when using 1 first quarter moon left and right sides, system's Catalytic Layer resistance just reaches more than 1300 millimeters of water, therefore catalyst is short service life, only is 1.5 months generally, promptly needs the more catalyst changeout that often stops, not only influence is produced, and has improved manufacturing cost.
In addition, also developed at present silver has been loaded on the technology of making carried silver catalyst on the carrier, as notification number is that CN1103244C, name are called in the patent of invention of " novel load silver catalyst and preparation method thereof " and disclose a kind of carried silver catalyst, though the anti-sintering of this catalyst, prolonged life of catalyst, but its thermal conductivity is relatively poor, and is not easy regeneration or regeneration cost height.
Summary of the invention
The objective of the invention is provides catalyst for electrolytic silver composition, the catalyst for electrolytic silver bed that a kind of life cycle is long, SR is little at above problem.
For realizing purpose of the present invention, the catalyst for electrolytic silver composition that one aspect of the present invention provides is made up of fibrous type electrolytic silver and crystal type electrolytic silver.
Particularly, the weight proportion of fibrous type electrolytic silver and crystal type electrolytic silver is: fibrous type electrolytic silver 10-35 part, crystal type electrolytic silver 65-90 part.Wherein, crystal type electrolytic silver particle is the 8-24 order, and the particle of fibrous type electrolytic silver is the 32-40 order.
On the other hand, the present invention also provides a kind of catalyst for electrolytic silver bed, comprise at least one catalyst for electrolytic silver layer, this catalyst layer has layering that is made of first component and the layering that is made of second component, and the layering that the layering that first component constitutes and second component constitute is parallel laid successively from the bottom to top.
Wherein, first component is the crystal type electrolytic silver, and second component is the fibrous type electrolytic silver, and the weight proportion of first component and second component is: 65-90 part: 10-35 part, the particle of the particle of first component and described second component is respectively 8-24 order and 32-40 order.
Particularly, the layering that is made of first component comprises three layerings of laying successively from the bottom to top, and the particle order number of forming three layerings increases from the bottom to top successively; The layering that is made of second component comprises that lower leaf particle order number is less than the particle order number of higher slice by following two layerings from last laying.
Advantage of the present invention is mainly reflected in following aspect:
1, compare with the catalyst for electrolytic silver that uses in the existing formaldehyde production, prolong the service life of product of the present invention greatly, extends to 60 days by 45 days, prolonged more than 25%.
2, product of the present invention rises the Catalytic Layer resistance to slow down greatly, avoided in the formaldehyde production in the past because use fibrous type electrolytic silver bad mechanical strength, structure is more open, melting range is long, the too fast problem of Catalytic Layer resistance rising that causes of sintering easily.
Brief Description Of Drawings
Fig. 1 is the schematic diagram of mating formation of catalyst for electrolytic silver embodiment of the present invention.
Fig. 2 is the preparation flow figure of fibrous type catalyst for electrolytic silver,
Description of reference numerals: 1, oxidator main cylinder; 2,40 order fiber silver layers; 3,32 order fiber silver layers; 4,24 order crystalline silver layers; 5,16 order crystalline silver layers; 6,8 order crystalline silver layers, 7, upper perforated plate; 8, catalyst supports cylindrical shell; 9,40 order copper mesh; 10,8 order copper mesh; 11, stainless steel cloth; 12, heat exchanger tube.
The specific embodiment
Describe the specific embodiment of catalyst for electrolytic silver composition of the present invention and catalyst for electrolytic silver bed with reference to the accompanying drawings in detail.
As shown in Figure 1, the upper perforated plate 8 of oxidation of formaldehyde device is provided with catalyst and supports cylindrical shell 7, forms the space of laying catalyst for electrolytic silver composition of the present invention between upper perforated plate 8 and the support cylindrical shell 7.In this space, lay stainless steel cloth 11,8 order copper mesh 10,40 order copper mesh 9 at first from the bottom to top, totally three layers of silk screen.Wherein stainless steel cloth 11 and 8 purpose copper mesh 10 mainly play the supporting catalyst effect, guarantee to maintain a certain distance between catalyst and the upper perforated plate 8, purpose is to make the back formaldehyde gas that generates of the reaction heat exchanger tube 12 by being positioned at upper perforated plate 8 belows and being attached thereto smoothly; And the purpose that 40 order copper mesh 9 are set is not allow catalyst granules run off during by Catalytic Layer at reaction gas.Then, on 40 order silk screens 9, lay catalyst bed, this catalyst bed comprises five catalyst layerings from the bottom to top altogether, total pavement thickness of catalyst bed is 15-20mm, therefore the thickness of per minute layer is 3-4mm, and these five layerings comprise 8 order crystallizations silver layering, 6,16 order crystallizations silver layering, 5,24 order crystallizations silver layering 4,32 order fibers silver layering 3 and the layering 2 of 40 order fibers silver.
Below with reference to as shown in Figure 2, the preparation technology of the fibrous type electrolytic silver of using is described, concrete processing step is as follows:
In the once electrolytic groove with platinum bar or titanium plate as anode, adopt the GB4135-2002IC-Ag99.99 silver bullion as raw material for the anode use, making concentration is 4-5%, Fe
3+The AgNO3 electrolyte of content≤20 mg/litre is that 7A/ square decimeter, voltage are that 12～15V carries out redox reaction in current density, electrolysis temperature is at 50～55 ℃, separate out the electrolytic silver of purification on the negative electrode, regularly the electrolytic silver of separating out is scraped off, deliver to the raw material of re-electrolysis groove as its anode;
In current density is that 14A/ square decimeter, voltage are under 55～60 ℃ of 12～15V and the liquid temperature, proceeds electrolysis for the second time, separates out loose electrolytic silver on the negative electrode, regularly the electrolytic silver of separating out is scraped off to be placed on and carries out submergence in the distilled water and clean.When treating that re-electrolysis silver is collected constant weight, carry out distilled water washing, suction filtration for several times, in check filtrate till the no silver ion.
Following operation is carried out in continuation in proper order: under 120 ℃ above electrolytic silver through the distilled water washing is dried 2 hours so that the electrolytic silver drying; Then, 680 ℃ of following heat stabilisation process 2 hours, carry out successively afterwards: granulation is so that obtaining electrolytic silver particle, screening, the finished product packing of regulation order number puts dry place and preserve, for the needs on producing.
The following describes the preparation technology of the crystal type electrolytic silver of use.The crystal type electrolytic silver adopts once electrolytic technology, and concrete processing step is as follows:
The pole plate made from acid resisting alloy steel or titanium plate in electrolytic cell (hole of uniform 5mm on the plate) is as anode, adopts the GB4135-2002IC-Ag99.99 silver bullion as the raw material for the anode use, makes that concentration is 10%, Fe
3+The AgNO3 electrolyte of content≤20 mg/litre is that 50A/ square decimeter, voltage are to carry out redox reaction under the 10V in current density, and electrolysis temperature is at 35 ℃, and separating out on the minus plate is that granular electrolytic silver also falls down automatically, becomes to be deposited on cell bottom;
Regularly granular electrolytic silver is pulled out, when collecting constant weight, carries out the distilled water submergence and clean, suction filtration for several times, in check filtrate till the no silver ion;
Under 200 ℃ with above graininess electrolytic silver oven dry 2 hours through distilled water washing so that the electrolytic silver drying, filter out the crystal type electrolytic silver finished product of regulation order number, with finished product packing and put dry place and preserve, for the needs on producing.
Embodiment one
Be that 1800mm, the oxidator of producing 50000 tons of formaldehyde per year are the concrete process of deployment of example explanation catalyst for electrolytic silver bed of the present invention below with the diameter:
1, prepare the catalyst layer raw material according to following weight proportion:
40 order fibrous type silver catalyst 8kg,
32 order fibrous type silver catalyst 25kg
24 order crystal type silver catalyst 20kg
16 order crystal type silver catalyst 27kg
8 order crystal type silver catalyst 30kg
The weight proportion of fibrous type silver catalyst and crystal type silver catalyst is 30: 70.
2, lay catalyst bed:
As shown in Figure 1, be mounted with catalyst on the upper perforated plate 7 of oxidation reactor and support cylindrical shell 8, the upper surface of the upper perforated plate 7 that centers at the inner cylinder face that supports cylindrical shell 8 is successively laid stainless steel cloth 11,8 order copper mesh 10,40 order copper mesh 9 at first from the bottom to top, then on copper mesh 9, lay catalyst bed, promptly lay 8 order crystallizations silver layering, 6,16 order crystallizations silver layering, 5,24 order crystallizations silver layering 4,32 order fibers silver layering 3 and the layering 2 of 40 order fibers silver from the bottom to top successively, form the catalyst bed of forming by the silver catalyst of two types of fibrous type and crystal types thus.
Embodiment two
Adopt the oxidator identical, lay catalyst for electrolytic silver bed of the present invention according to the following steps with embodiment one:
1, prepare the raw material of every catalyst layer according to following weight proportion:
40 order fibrous type silver catalyst 7kg
32 order fibrous type silver catalyst 20.5kg
24 order crystal type silver catalyst 22.5kg
16 order crystal type silver catalyst 30kg
8 order crystal type silver catalyst 30kg
The weight proportion of fibrous type silver catalyst and crystal type silver catalyst is 25: 75.
2, lay catalyst bed:
Concrete steps are identical with embodiment one.
Embodiment three
Adopt the oxidator identical, lay catalyst for electrolytic silver bed of the present invention according to the following steps with embodiment one:
1, prepare the raw material of every catalyst layer according to following weight proportion:
40 order fibrous type silver catalyst 8kg,
32 order fibrous type silver catalyst 27kg
24 order crystal type silver catalyst 15kg
16 order crystal type silver catalyst 20kg
8 order crystal type silver catalyst 30kg
The weight proportion of fibrous type silver catalyst and crystal type silver catalyst is 35: 65.
2, lay catalyst bed:
Concrete steps are identical with embodiment one.
Embodiment four
Adopt the oxidator identical, lay catalyst for electrolytic silver bed of the present invention according to the following steps with embodiment one:
1, prepare the raw material of every catalyst layer according to following weight proportion:
40 order fibrous type silver catalyst 5kg,
32 order fibrous type silver catalyst 5kg
24 order crystal type silver catalyst 18kg
16 order crystal type silver catalyst 30kg
8 order crystal type silver catalyst 42kg
The weight proportion of fibrous type silver catalyst and crystal type silver catalyst is 10: 90.
2, lay catalyst bed:
Concrete steps are identical with embodiment one.
Experimental example one to four
It is that 50,000 tons, diameter are 1800 meters formaldehyde oxidation reactor that Formaldehyde Production equipment adopts annual production.In this equipment, lay catalyst for electrolytic silver bed of the present invention according to embodiment one to four respectively.
Experimental example one to four is: utilize the above-mentioned formaldehyde oxidation reactor of laying catalyst for electrolytic silver bed of the present invention according to embodiment one to four respectively, prepare formaldehyde by methanol oxidation, the ordinary production process conditions of preparation formaldehyde are controlled to be: methyl alcohol air ratio (being volume ratio) is 1: 1, reaction temperature is 620 ℃, water vapour and methyl alcohol weight ratio are 1: 2.5, and the maximum of air mass flow is 3800Nm
3/ H.
Under the full production situation, above-mentioned annual production is that 50,000 tons formaldehyde oxidation reactor can be produced the formaldehyde of 37% concentration with 6.5 tons/hour speed.In the time of back 4 hours, 1.5 months, 2 months, detect the oxidator resistance in driving respectively, testing result sees Table 1.
Adopt Pressure gauge (model Y-150) to detect the oxidator resistance; Formaldehyde gas production concentration by preparation is 37% formalin, detects the methanol content in the formalin of this 37% concentration according to method shown in the GB/T9009-1998.
Reference examples
Adopt the oxidator identical with embodiment one, employing is with the following method for paving catalyst for electrolytic silver bed of mating formation, in contrast in this oxidator:
40 order fibrous type silver catalyst 8kg
32 order fibrous type silver catalyst 25kg
24 order fibrous type silver catalyst 25kg
16 order fibrous type silver catalyst 22kg
8 order fibrous type silver catalyst 20kg
Utilize above-mentioned formaldehyde oxidation reactor to prepare the process conditions of formaldehyde and speed of production with experimental example one to four by methanol oxidation, under the full production situation, respectively in driving in the time of back 4 hours, 1.5 months, 2 months, detect methanol content in oxidator resistance and the finished product, detection method is with experimental example one to four, and testing result sees Table 1.
Table 1
By table 1 as seen, the catalyst of reference examples just makes the oxidator resistance reach 1300 millimeters of water when using 1.5 months, makes the oxidator resistance reach 1800 millimeters of water when using 2 months, and also significantly increase of methanol content, has reached 1.5%.Because the oxidator resistance directly influences the production capacity of oxidator, resistance is big causes the also corresponding increase of power of motor of air blast, when the oxidator resistance reaches 1300 millimeters of water, catalyst changeout more just, otherwise under the condition that formaldehyde output remains unchanged, will enlarge markedly the load of air blast, be easy to damage air blast.
By it can also be seen that in the table 1, catalyst of the present invention makes the oxidator resistance be no more than 1200 millimeters of water when using 2 months, this shows that product of the present invention has significantly reduced the oxidator resistance, prolonged the service life of catalyst, catalyst still can guarantee more than 2 months that in use the output of formaldehyde gas does not reduce, and methanol content also remains unchanged.
Claims (7)
1, a kind of catalyst for electrolytic silver composition is characterized in that being made up of fibrous type electrolytic silver and crystal type electrolytic silver, and wherein crystal type electrolytic silver particle is the 8-24 order, and the particle of fibrous type electrolytic silver is the 32-40 order.
2, catalyst for electrolytic silver composition as claimed in claim 1, it is characterized in that: the weight proportion of described component is: fibrous type electrolytic silver 10-35 part, crystal type electrolytic silver 65-90 part.
3, a kind of catalyst for electrolytic silver bed that is used to prepare formaldehyde, it is characterized in that: comprise at least one catalyst for electrolytic silver layer, this catalyst layer has layering that is made of first component and the layering that is made of second component, the layering that the layering that first component constitutes and second component constitute is parallel laid successively from the bottom to top, wherein first component is that particle is a 8-24 purpose crystal type electrolytic silver, and second component is that particle is the fibrous type electrolytic silver for the 32-40 order.
4, catalyst for electrolytic silver bed as claimed in claim 3 is characterized in that: the weight proportion of described first component and second component is: 65-90 part: 10-35 part.
5, as claim 3 or 4 described catalyst for electrolytic silver beds, it is characterized in that: the layering that is made of described first component comprises three layerings of laying successively from the bottom to top, and the particle order number of forming three layerings increases from the bottom to top.
6, as claim 3 or 4 described catalyst for electrolytic silver beds, it is characterized in that: the layering that is made of described second component comprises that the particle order number of lower leaf is less than the particle order number of higher slice by following two layerings from last laying.
7, as claim 3 or 4 described catalyst for electrolytic silver beds, it is characterized in that: the layering that is made of described first component comprises three layerings of laying successively from the bottom to top, and the particle order number of forming three layerings increases from the bottom to top successively; The layering that is made of described second component comprises that the particle order number of higher slice is greater than lower leaf particle order number by following two layerings from last laying.
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| CNB2007100649178A CN100435943C (en) | 2007-03-29 | 2007-03-29 | Silver-electrolyzing catalyst composition and silver-electrolyzing catalyst bed |
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| CNB2007100649178A CN100435943C (en) | 2007-03-29 | 2007-03-29 | Silver-electrolyzing catalyst composition and silver-electrolyzing catalyst bed |
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| CN100435943C true CN100435943C (en) | 2008-11-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018153736A1 (en) | 2017-02-24 | 2018-08-30 | Basf Se | Silver catalyst system having a reduced pressure drop for the oxidative dehydrogenation of alcohols |
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| CN112707803A (en) * | 2020-12-25 | 2021-04-27 | 国家能源集团宁夏煤业有限责任公司 | Method and system for preparing aldehyde by alcohol oxidation |
| CN112604683B (en) * | 2020-12-25 | 2022-11-08 | 国家能源集团宁夏煤业有限责任公司 | Silver catalyst bed and application thereof, and method for preparing aldehyde by alcohol oxidation |
| CN112871163A (en) * | 2021-01-08 | 2021-06-01 | 迈奇化学股份有限公司 | Catalyst for synthesizing pyruvaldehyde by propylene glycol and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4010208A (en) * | 1973-05-05 | 1977-03-01 | Basf Aktiengesellschaft | Production of formaldehyde |
| JPH06184035A (en) * | 1992-12-11 | 1994-07-05 | Mitsui Toatsu Chem Inc | Production of formaldehyde |
| RU2119385C1 (en) * | 1996-06-11 | 1998-09-27 | Общество с ограниченной ответственностью Научно-производственная фирма "ГЛИКО" | Glyoxal production catalyst |
| RU2278729C1 (en) * | 2004-12-02 | 2006-06-27 | Институт химии нефти Сибирского отделения Российской Академии наук (ИХН СО РАН) | Glyoxal production catalyst |
| CN1935365A (en) * | 2005-09-19 | 2007-03-28 | 李洪伟 | Long-acting catalyst for electrolytic silver |
-
2007
- 2007-03-29 CN CNB2007100649178A patent/CN100435943C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4010208A (en) * | 1973-05-05 | 1977-03-01 | Basf Aktiengesellschaft | Production of formaldehyde |
| JPH06184035A (en) * | 1992-12-11 | 1994-07-05 | Mitsui Toatsu Chem Inc | Production of formaldehyde |
| RU2119385C1 (en) * | 1996-06-11 | 1998-09-27 | Общество с ограниченной ответственностью Научно-производственная фирма "ГЛИКО" | Glyoxal production catalyst |
| RU2278729C1 (en) * | 2004-12-02 | 2006-06-27 | Институт химии нефти Сибирского отделения Российской Академии наук (ИХН СО РАН) | Glyoxal production catalyst |
| CN1935365A (en) * | 2005-09-19 | 2007-03-28 | 李洪伟 | Long-acting catalyst for electrolytic silver |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018153736A1 (en) | 2017-02-24 | 2018-08-30 | Basf Se | Silver catalyst system having a reduced pressure drop for the oxidative dehydrogenation of alcohols |
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