Glycol as catalyst prepared by hydrogenising oxalate as well as forming method and application thereof
A molding method and catalyst technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of low yield of finished products, low space velocity, and high wear rate problem, to achieve the effect of good activity and selectivity, long service life and high mechanical strength
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Embodiment 1
[0019] One with 40CuOx / SiO 2 (wherein, x is 1 / 2 of Cu valence number,) the preparation and molding method of the copper silicon oxalate hydrogenation catalyst represented are as follows:
[0020] Pour 45g of treated white carbon black into a round-bottomed flask, mix with 100g of deionized water and add acid to adjust the pH to 3 to obtain solution A. Solution A was added to the solution containing 118g Cu(NO 3 ) 2 copper nitrate solution, and adjust the pH of the mixture to 8 with 5% ammonia water, and heat up to 75°C for aging for 22 hours. After the reaction was completed, the feed liquid was filtered while it was hot, washed with deionized water several times, washed with ethanol and suction filtered to a certain amount of retained water, and then uniformly dehydrated at 95°C so that the retained water rate in the material was 52wt%. The material is kneaded to obtain a solid wet material. The solid wet material is molded into a strip with a diameter of 5.9mm under a pr...
Embodiment 2～4
[0024] In addition to changing the water retention rate in the dehydration process, all the other catalysts were prepared under the same conditions and methods as in Example 1. The mechanical strength of the molded catalyst and the results after 8 hours of hydrogenation of oxalate were listed in Table 1.
[0025] Table 1 The strength, attrition rate and 8-hour results of oxalate hydrogenation reaction of shaped catalysts at different water retention rates
[0026] name Example 1 Example 2 Example 3 Example 4 Water retention rate, % mass 52 85 70 15 Longitudinal strength, N / cm 2 958.3 723.5 850.3 910.3
[0027] Transverse strength, N / cm 190.1 204.9 195.1 173.2 Wear rate, % 0.594 0.793 0.802 1.623 Oxalate conversion rate, % 99.2 98.3 99.1 98.9 Ethylene glycol selectivity, % 92.6 93.6 94.3 93.5 name Comparative example 1 Comparative example 2
Embodiment 5～7
[0033] Except changing dehydration temperature, all the other are prepared catalyst by the same condition and method of embodiment 1, the mechanical strength of the catalyst after molding and the result after reacting for 8 hours are listed in table 2
[0034] The strength of shaped catalyst under table 2 different dehydration temperatures, the attrition rate and the result of 8 hours of reaction
[0035] name Example 1 Example 5 Example 6 Example 7 Dehydration temperature, ℃ 95 80 110 120 Longitudinal strength, N / cm 2 958.3 897.3 698.3 496.1 Transverse strength, N / cm 190.1 132.1 100.1 78.3 Wear rate, % 0.594 0.789 4.035 10.013 Oxalate conversion rate, % 99.2 99.1 99.6 99.3 Ethylene glycol selectivity, % 92.6 93.5 92.1 91.9
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Abstract
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