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Catalyst for synthesizing melamine and preparing method

A melamine and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of harsh reaction conditions, high investment cost, long reaction process, etc., and achieve short induction period and high catalyst strength. , the effect of high selectivity

Inactive Publication Date: 2007-08-29
SANLONG CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it also brings about the problems of high investment cost, long reaction process and harsh reaction conditions.

Method used

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  • Catalyst for synthesizing melamine and preparing method
  • Catalyst for synthesizing melamine and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add commercially available aluminum silicate [Hz][Al 2-x h x ][Si 4-y al y ]O 12 Wherein x=0.15, y=0.07, z=0.22, 70kg mix well, then add 3% dilute nitric acid 65kg, carry out kneading, knead about 40 minutes, extrude in extruder after, extruding pressure is 5Mpa, bar diameter 3mm, strips were dried at 105°C, crushed by a crusher, sieved through a 60-120 mesh vibrating sieve, and activated at 480°C for 3 hours to obtain a melamine catalyst. The obtained catalyst stack has a specific gravity of 0.66g / ml and a specific surface area of ​​215.8m 2 / g, pore volume 0.305ml / g, abrasion 0.9%. Description of drawings: Fig. 1 is the X-ray diffraction spectrogram of obtained catalyst. The application results of this catalyst on a 1000t / a melamine industrial production plant: when the reaction temperature is 390°C, and the urea feeding amount is 71.5kg / tCat×, the total feeding amount of urea is 198.5 tons, melamine is obtained 63.016 tons, and the reaction conversion rate is 3....

Embodiment 2

[0030] With commercially available aluminum silicon oxide [Hz] [Al 2-x h x ][Si 4-y al y ]O 12 Wherein x=0.15, y=0.07, z=0.22, 700g, add 300g of commercially available pseudo-thin alumina and mix evenly, then add 3% dilute phosphoric acid and knead, the consumption of dilute phosphoric acid is 700ml; knead about 40 minutes, then Extrude the rod in the extruder, the pressure is 5Mpa, the diameter of the rod is 3mm. The strips were dried at 105°C, crushed by a crusher, sieved through a 60-120 mesh vibrating sieve, and activated at 480°C for 3 hours to obtain a melamine catalyst. The obtained catalyst: bulk specific gravity 0.73g / ml, specific surface 182.7m 2 / g, pore volume 0.309ml / g, abrasion 1.62%. The evaluation result of the agent when the reaction temperature is 370°C on the small-scale fluidized bed activity evaluation device: when the urea dosage is 160.4g / kgCat×, the reaction conversion rate is 3.14g urea / g melamine. The results are shown in Table 1 and Table 2. ...

Embodiment 3

[0032] Use commercially available carbonized dry rubber powder 400g, add commercially available aluminum silicon oxide 600g, [Hz][Al 2-x h x ][Si 4-y al y ]O 12 Among them, x=0.16, y=0.08, z=0.24 and 30g of safflower powder are mixed evenly, and then kneaded by adding water, the amount of water added is 700g, kneaded for about 40 minutes, and the pressure is 5Mpa, extruded in the extruder, the diameter of the strip 3-5mm. The strips are dried at 100°C, crushed by a crusher, sieved through a 60-120 mesh vibrating sieve, activated at 500°C for 2.5 hours to obtain a melamine catalyst. The obtained catalyst: bulk specific gravity 0.69g / ml, specific surface 201.5m 2 / g, pore volume 0.321ml / g, abrasion 1.2%. The evaluation result of the catalyst when the reaction temperature is 370° C. on a small-scale fluidized bed activity evaluation device: when the urea dosage is 135.4 g / kgCat×, the reaction conversion rate is 3.26 g urea / g melamine. The results are shown in Table 1 and T...

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Abstract

The invention relates to a synthesis melamine catalyst and manufacturing method. Used the following ways: the structure of the [Hz][Al2-xHx][Si4-yAly]012 commercial aluminum-silicon oxide and alumina market add to Kneading Machine, in Kneading process of accession water or acid solution, using pressure spray granulation, spouted bed granulator granulation or a crowded screening broken granulation process, It through drying, screening, activation processing to get the melamine catalyst; The commercial aluminum-silicon oxide of Structure [Hz][Al2-xHx][Si4-yAly]012 is X=0.15-0.2, Y=0.05, Z= X + Y. This invention catalyst has the advantages of high strength low attrition rate, low temperature catalyst, a catalyst has larger load for raw materials urea, catalyst with high selectivity, less by-product, short induction period. Preparation method is simple, low cost, with high cost-effectiveness.

Description

Technical field: [0001] The invention relates to a catalyst for synthesizing melamine and a preparation method thereof. Background technique: [0002] Melamine is an important nitrogen-heterocyclic organic chemical intermediate product, mainly used in the production of triamine-formaldehyde resin. As a thermosetting resin, it has the characteristics of heat resistance, aging resistance, acid and alkali resistance, and flame retardancy. Widely used in wood processing, coatings, papermaking, textiles, leather, decorative boards, laminates, composite floors, flame retardant materials, water reducing agents, adhesives and melamine molding powder and other industries. In recent years, with the in-depth research on melamine and the continuous improvement of people's living standards, its application field and scope are also expanding. After entering the 21st century, due to the market demand, the annual growth rate of melamine exceeds 15%. [0003] The normal and low pressure me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/12B01J21/04C07D251/60
Inventor 沈炳龙沈雁鸣刘汉茂吕光烈沈雁军陈林深王忠英
Owner SANLONG CATALYST
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