CN1846848A - Production process of alumina catalyst for producing melamine - Google Patents
Production process of alumina catalyst for producing melamine Download PDFInfo
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- CN1846848A CN1846848A CN 200610044203 CN200610044203A CN1846848A CN 1846848 A CN1846848 A CN 1846848A CN 200610044203 CN200610044203 CN 200610044203 CN 200610044203 A CN200610044203 A CN 200610044203A CN 1846848 A CN1846848 A CN 1846848A
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- spherolite
- roasting
- alumina catalyst
- aluminium oxide
- producing melamine
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Abstract
The present invention relates to production process of alumina catalyst for producing melamine. The production process includes mixing alumina in 30-95 wt% and aluminum hydroxide in 5-70 wt%, spraying water to the mixture, rolling into pellets, drying, sieving and roasting. The alumina catalyst can meet the requirement of producing melamine, and has homogeneous granularity distribution, high strength, high alumina content, low impurity content, wide regulation range of bulk density, pore volume and specific surface area and other advantages.
Description
Technical field
The present invention relates to a kind of production method of alumina catalyst for producing melamine, belong to synthesis technical field.
Background technology
Melamine is a kind of important azacyclo-Organic Chemicals, is converted products behind the important urea at present, and another name claims melamine, cyanuramide, melamine again.
Melamine is a kind of broad-spectrum basic organic chemical industry's intermediate products, and topmost purposes is the raw material as melamine/formaldehyde resin (MF), and melamine can also be made fire retardant, water reducer, formaldehyde cleaning agent etc.This resin hardness ratio urea formaldehyde height, nonflammable, water-fast, heat-resisting, ageing-resistant, anti-electric arc, resistance to chemical attack, good insulation performance performance, glossiness and mechanical strength are arranged, be widely used in industries such as timber, plastics, coating papermaking, weaving, leather, electric, medicine.
The melamine of melamine device production is to be raw material with urea, add in the reactor, vulcanize haptoreaction with catalyst (silica-gel catalyst or Alusil catalyst or aluminium oxide catalyst), reaction is the endothermic reaction, with fused salt carrier circulation heating, urea gasifies in reactor, decomposes, and generates melamine, carbon dioxide and ammonia, equation is:
(urea) (melamine) (ammonia) (carbon dioxide)
The used catalyst of domestic device is silica-gel catalyst and silica gel Al catalysts, adopts aluminium oxide catalyst abroad, and aluminium oxide catalyst is preferentially selected for use because of having the following advantages:
(1) active good, can reduce reaction temperature;
(2) accessory substance is few, and lower reaction temperature has improved the conversion ratio of reaction, has reduced the generation of byproduct of reaction;
(3) catalyst selectivity is strong, the catalytic efficiency height;
(4) intensity height wears away lowly, and use cost is low, helps steady production.
But aluminium oxide catalyst requires technical difficulty big, requires granularity, intensity (i.e. abrasion), heap ratio, pore volume, specific area, alumina content, impurity content geometric ratio higher, the present domestic aluminium oxide catalyst production technology that can meet the demands of still not having.
Summary of the invention
The object of the present invention is to provide a kind of production method of alumina catalyst for producing melamine, can produce and satisfy the aluminium oxide catalyst that Melamine Production requires, and technology is simple, small investment, non-pollution discharge, production cost is low.
The production method of alumina catalyst for producing melamine of the present invention, mix the back water spray by aluminium oxide and aluminium hydroxide and be rolled onto spherolite, sieve after the drying, make through roasting then, wherein the consumption weight percent proportioning of aluminium oxide and aluminium hydroxide is: aluminium oxide 30-95%, aluminium hydroxide 5-70%.
Wherein:
Sieve after the spherolite drying, the spherolite of getting between the 30-250 mesh sieve is suitable;
Sintering temperature is controlled to be 300-750 ℃, and roasting time 1-6 hour, crystalline phase was γ-Al
2O
3
Spherolite is got the spherolite between the 30-250 mesh sieve preferably through sieving once more after the roasting.
The present invention can produce and satisfy the aluminium oxide catalyst that Melamine Production requires, gained aluminium oxide catalyst Granularity Distribution is even, intensity height (promptly wearing away low), alumina content height, impurity content are low, and heap ratio, pore volume, specific area adjusting range are big, and product quality indicator sees Table 1.Can replace present silica-gel catalyst and Alusil catalyst fully, and technology is simple, small investment, non-pollution discharge, production cost is low, and energy consumption is low, economic benefit and obvious social benefit.
Table 1, product quality indicator table
| Project | Unit | Index | Remarks |
| Chemical property | |||
| Al 2O 3 | Weight % | ＞90 | Crystal phase structure: γ-Al 2O 3 |
| Na 2O | Weight % | ＜0.3 | |
| Fe 2O 3 | Weight % | ＜0.1 | |
| SiO 2 | Weight % | ＜0.3 | |
| Burn and lose | Weight % | ＜8 | |
| Physical property | |||
| Specific area | m 2/g | ＞160 | |
| Pore volume | ml/g | ＞0.35 | |
| Bulk density | g/ml | ＜0.75 | |
| Abrasion index | Weight % | ＜4 | |
| Size distribution | |||
| ＞250 orders | Weight % | ＜5 | |
| The 250-30 order | Weight % | ＞90 | |
| ＜30 orders | Weight % | ＜5 | |
| Outward appearance | The white microballoon | ||
| The spherolite qualification rate | Weight % | ≥85 |
The specific embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1
The production method of alumina catalyst for producing melamine of the present invention is as follows:
Get aluminium oxide 80Kg and aluminium hydroxide 20Kg is put in the sugar coating machine, after stirring, add 20% water, spray into spray gun, in mixed process, material forms spherolite gradually, microballoon sifts out, and it is dry to put into drying box, sieves with 30 orders and 250 eye mesh screens, get the spherolite between the 30-250 mesh sieve, carry out roasting, sintering temperature is 500 ℃, 5 hours time, spherolite is got the spherolite between the 30-250 mesh sieve through sieving once more after the roasting, is the aluminium oxide catalyst product.
Embodiment 2
The production method of alumina catalyst for producing melamine of the present invention is as follows:
Get aluminium oxide 75Kg and aluminium hydroxide 25Kg is put in the sugar coating machine, after stirring, add 30% water, spray into spray gun, in mixed process, material forms spherolite gradually, microballoon sifts out, and it is dry to put into drying box, sieves with 30 orders and 250 eye mesh screens, get the spherolite between the 30-250 mesh sieve, carry out roasting, sintering temperature is 700 ℃, 4 hours time, spherolite is got the spherolite between the 30-250 mesh sieve through sieving once more after the roasting, is the aluminium oxide catalyst product.
Embodiment 3
The production method of alumina catalyst for producing melamine of the present invention is as follows:
Get aluminium oxide 60Kg and aluminium hydroxide 40Kg is put in the sugar coating machine, after stirring, add 15% water, spray into spray gun, in mixed process, material forms spherolite gradually, microballoon sifts out, and it is dry to put into drying box, sieves with 30 orders and 250 eye mesh screens, get the spherolite between the 30-250 mesh sieve, carry out roasting, sintering temperature is 500 ℃, roasting time 4 hours, spherolite is got the spherolite between the 30-250 mesh sieve through sieving once more after the roasting, is the aluminium oxide catalyst product.
Embodiment 4
The production method of alumina catalyst for producing melamine of the present invention is as follows:
Get aluminium oxide 35Kg and aluminium hydroxide 65Kg is put in the sugar coating machine, after stirring, add 25% water, spray into spray gun, in mixed process, material forms spherolite gradually, microballoon sifts out, and it is dry to put into drying box, sieves with 30 orders and 250 eye mesh screens, get the spherolite between the 30-250 mesh sieve, carry out roasting, sintering temperature is 600 ℃, roasting time 3.5 hours, spherolite is got the spherolite between the 30-250 mesh sieve through sieving once more after the roasting, is the aluminium oxide catalyst product.
Embodiment 5
The production method of alumina catalyst for producing melamine of the present invention is as follows:
Get aluminium oxide 85Kg and aluminium hydroxide 15Kg is put in the sugar coating machine, after stirring, add 22% water, spray into spray gun, in mixed process, material forms spherolite gradually, microballoon sifts out, and it is dry to put into drying box, sieves with 30 orders and 250 eye mesh screens, get the spherolite between the 30-250 mesh sieve, carry out roasting, sintering temperature is 450 ℃, roasting time 6 hours, spherolite is got the spherolite between the 30-250 mesh sieve through sieving once more after the roasting, is the aluminium oxide catalyst product.
Embodiment 6
The production method of alumina catalyst for producing melamine of the present invention is as follows:
Get aluminium oxide 40Kg and aluminium hydroxide 60Kg is put in the sugar coating machine, after stirring, add 18% water, spray into spray gun, in mixed process, material forms spherolite gradually, microballoon sifts out, and it is dry to put into drying box, sieves with 30 orders and 250 eye mesh screens, get the spherolite between the 30-250 mesh sieve, carry out roasting, sintering temperature is 500 ℃, roasting time 5 hours, spherolite is got the spherolite between the 30-250 mesh sieve through sieving once more after the roasting, is the aluminium oxide catalyst product.
Embodiment 7
The production method of alumina catalyst for producing melamine of the present invention is as follows:
Get aluminium oxide 65Kg and aluminium hydroxide 35Kg is put in the sugar coating machine, after stirring, add 12% water, spray into spray gun, in mixed process, material forms spherolite gradually, microballoon sifts out, and it is dry to put into drying box, sieves with 30 orders and 250 eye mesh screens, get the spherolite between the 30-250 mesh sieve, carry out roasting, sintering temperature is 350 ℃, roasting time 6 hours, spherolite is got the spherolite between the 30-250 mesh sieve through sieving once more after the roasting, is the aluminium oxide catalyst product.
Embodiment 8
The production method of alumina catalyst for producing melamine of the present invention is as follows:
Get aluminium oxide 50Kg and aluminium hydroxide 50Kg is put in the sugar coating machine, after stirring, add 30% water, spray into spray gun, in mixed process, material forms spherolite gradually, microballoon sifts out, and it is dry to put into drying box, sieves with 30 orders and 250 eye mesh screens, get the spherolite between the 30-250 mesh sieve, carry out roasting, sintering temperature is 550 ℃, roasting time 5 hours, spherolite is got the spherolite between the 30-250 mesh sieve through sieving once more after the roasting, is the aluminium oxide catalyst product.
Claims (4)
1, a kind of production method of alumina catalyst for producing melamine, it is characterized in that mixing the back water spray by aluminium oxide and aluminium hydroxide is rolled onto spherolite, sieve after the drying, make through roasting then, wherein the consumption weight percent proportioning of aluminium oxide and aluminium hydroxide is:
Aluminium oxide 30-95%, aluminium hydroxide 5-70%.
2, the production method of alumina catalyst for producing melamine according to claim 1 is characterized in that sieving after the spherolite drying, gets the spherolite between the 30-250 mesh sieve.
3,, it is characterized in that sintering temperature is controlled to be 300-750 ℃, roasting time 1-6 hour according to the production method of claim 1 and 2 described alumina catalyst for producing melamine.
4, the production method of alumina catalyst for producing melamine according to claim 3, it is characterized in that roasting after spherolite through sieving once more, get the spherolite between the 30-250 mesh sieve.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100442036A CN100388972C (en) | 2006-05-16 | 2006-05-16 | Production process of alumina catalyst for producing melamine |
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| CNB2006100442036A CN100388972C (en) | 2006-05-16 | 2006-05-16 | Production process of alumina catalyst for producing melamine |
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| CN1846848A true CN1846848A (en) | 2006-10-18 |
| CN100388972C CN100388972C (en) | 2008-05-21 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3138419A1 (en) * | 1981-09-26 | 1983-04-14 | Basf Ag, 6700 Ludwigshafen | METHOD FOR IMPROVING MELAMINE QUALITY BY REACTIVATING CATALYSTS USED IN MELAMINE SYNTHESIS |
| JPH0827127A (en) * | 1994-07-20 | 1996-01-30 | Mitsui Toatsu Chem Inc | Production of melamine |
| EP1188751A1 (en) * | 2000-09-13 | 2002-03-20 | Casale Chemicals SA | Process for the production of high purity melamine from urea |
| DE10301703A1 (en) * | 2003-01-17 | 2004-07-29 | Basf Ag | Melamine production by urea decomposition is effected in main- and post- reactors containing catalysts of different acidity values |
| DE502004003874D1 (en) * | 2004-01-17 | 2007-07-05 | Casale Chemicals Sa | Process for the gentle cooling and crystallization of melamine from a melamine melt or from the gas phase |
| JP2007517818A (en) * | 2004-01-17 | 2007-07-05 | カサーレ ケミカルズ エス．エー． | Method for producing catalytic melamine to improve melamine yield |
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2006
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