Catalyst for synthesizing melamine and preparation method thereof
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A melamine and catalyst technology, which is applied in the field of synthesis of melamine catalyst and its preparation, can solve the problems of harsh reaction conditions, high investment costs, and long reaction process, and achieve the effects of short induction period, low reaction temperature, and simple preparation method
Inactive Publication Date: 2020-01-10
QINGDAO HUICHENG PETROCHEM TECH
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Problems solved by technology
However, it also brings about the problems of high investment cost, long reaction process and harsh reaction conditions.
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Embodiment 1
[0025] (1) Weigh 555g of silicon powder, add 1000g of water, and stir evenly;
[0026] (2) Take by weighing 462g pseudo-boehmite, add in the slurry in step (1), add hydrochloric acid solution to adjust the pH value to about 3.2;
[0027] (3) Take by weighing 200g silica sol and 682g phosphoraluminum glue, add in the slurry in step (2), add 434g water again, fully stir;
[0028] (4) Spray molding with LX-15 centrifugal spray tower, then roast, wash and dry to prepare melamine catalyst, denoted as M-A.
Embodiment 2
[0030] (1) Weigh 611g of silicon powder, add 1050g of water, and stir evenly;
[0031] (2) Take by weighing 385g pseudo-boehmite, add in the slurry in step (1), add nitric acid solution to adjust the pH value to about 3.2;
[0032] (3) Take by weighing 909g aluminum sol, add in the slurry in step (2), add 378g water again, fully stir;
[0033] (4) Spray molding with LX-15 centrifugal spray tower, then roast, wash and dry to prepare melamine catalyst, denoted as M-B.
[0036] (2) Take by weighing 308g pseudo-boehmite, add in the slurry in step (1), add hydrochloric acid solution to adjust the pH value to about 3.2;
[0037] (3) Take by weighing 200g silica sol and 682g aluminum sol, add in the slurry in step (2), add 376g water again, fully stir;
[0038] (4) Spray molding with LX-15 centrifugal spray tower, and then prepare melamine catalyst through roasting, washing and drying, denoted as M-C.
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Abstract
A catalyst for melamine production contains 30-55 wt% of Al2O3, 45-70 wt% of SiO2 and 0-10 wt% of P2O5. The Al2O3 comprises two parts, one of which is used as an active component and the other is usedas a binder. The SiO2 includes two parts, one part is used as a carrier of active component, and the other part is used as a binder. The P2O5 is used as a binder. The preparation method comprises thefollowing steps: adding water to the SiO2 carrier for pulping, adding the active component Al2O3, adding an acid solution to adjust the pH value, finally adding a binder, adopting spray granulation,roasting, washing and drying to obtain the melamine catalyst. The aluminum silicate melamine catalyst prepared by the invention not only has good physical and chemical properties, such as high strength (low abrasion), large water holes, large specific surface area adjustment range, but also has simple preparation method, less investment, no pollution emission, low production cost, low energy consumption, and remarkable economic and social benefits.
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] At present, the production of me...
Claims
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