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Preparation method of special high-performance 5A molecular sieve for pressure swing adsorption

A pressure swing adsorption and molecular sieve technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of low adsorption capacity of adsorbents, inactivation of biomass, and inability to meet the requirements, so as to solve the problem of difficult wastewater treatment. , The effect of increasing adsorption capacity and reducing COD content

Active Publication Date: 2010-11-24
都江堰清天新材料技术有限责任公司
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AI Technical Summary

Problems solved by technology

[0003] 5A molecular sieve is used as an adsorbent for oxygen production by pressure swing adsorption, purification of hydrogen and carbon monoxide, and dewaxing in petroleum refineries. The traditional production method is to mix 4A molecular sieve raw powder with kaolin to granulate, dry, calcinate, and alkali wash to crystallize. , CaCl 2 Exchange, activation, packaging and other steps, due to the exchange of calcium chloride, the wastewater has a high chloride ion content, and the wastewater with a high chloride ion content is likely to cause the inactivation of the biomass in the sewage treatment, and encounter the problem of difficult wastewater treatment; in addition, the traditional production The adsorption capacity of the adsorbent produced by this method is not high, and it cannot meet the requirements of the current large-scale pressure swing adsorption device.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 80 parts (weight) of 4A molecular sieve raw powder and 24 parts (weight) of kaolin, mix and granulate, and sieve to obtain a 4A molecular sieve of ￠2 to 2.5mm, dry at 150°C, and calcined at 640°C. The calcined 4A molecular sieve is used for 8 % by weight NaOH solution at a temperature of 90°C for crystallization to obtain a binder-free 4A molecular sieve, and after washing with water, perform ion exchange with saturated lime aqueous solution at 92°C, when the exchange degree reaches 70%, wash with water, and dry at 150°C Dry, activated at 420°C. The strength of the obtained product is 53.4N / particle, and the volume adsorption method is used at 25°C, 101.325×10 3 The adsorption capacity of nitrogen measured under Pa is 14.36ml / g, the adsorption capacity of oxygen is 4.35ml / g, the adsorption capacity of CO is 31.72ml / g, CH 4 The adsorption capacity was 16.56ml / g.

Embodiment 2

[0020] 80 parts (weight) of 4A molecular sieve raw powder and 22 parts (weight) of kaolin were mixed and granulated, and 4A molecular sieves of ￠2 to 2.5mm were obtained by sieving, dried at 150°C, and calcined at 650°C. The NaOH solution with a weight ratio is crystallized at a temperature of 91°C to obtain a binder-free 4A molecular sieve. After washing with water, ion exchange is performed with a saturated lime aqueous solution at 92°C. When the exchange degree reaches 80%, it is washed with water and dried at 150°C. Activated at 420°C. The strength of the obtained product is 52.9N / particle, and the volume adsorption method is used at 25°C, 101.325×10 3 The nitrogen adsorption capacity measured under Pa is 15.13ml / g, the oxygen adsorption capacity is 4.61ml / g, the CO adsorption capacity is 32.37ml / g, the CH 4 The adsorption capacity was 17.68ml / g.

Embodiment 3

[0022] 80 parts (weight) of 4A molecular sieve raw powder and 22 parts (weight) of kaolin were mixed and granulated, and 4A molecular sieves of ￠2 to 2.5mm were obtained by sieving, dried at 150°C, and calcined at 635°C. The NaOH solution with a weight ratio is crystallized at a temperature of 91°C to obtain a binder-free 4A molecular sieve. After washing with water, ion exchange is performed with a saturated lime aqueous solution at 92°C. When the exchange degree reaches 88%, it is washed with water and dried at 150°C. Activated at 430°C. The strength of the obtained product is 53.9N / particle, and the volume adsorption method is used at 25°C, 101.325×10 3 The nitrogen adsorption capacity measured under Pa is 16.43ml / g, the oxygen adsorption capacity is 5.11ml / g, the CO adsorption capacity is 34.67ml / g, the CH 4 The adsorption capacity was 18.69ml / g.

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Abstract

The invention relates to a preparation method of a special high-performance 5A molecular sieve for pressure swing adsorption, which comprises the following steps of: mixing and granulating 4A molecular sieve raw powder and kaolin clay, drying, calcining, washing with alkali and transforming crystals, exchanging, activating, packaging and the like. The invention has the characteristics that saturated lime water is used for exchanging, thereby avoiding the problem of difficult wastewater processing caused by high content of wastewater chloride ions when calcium chloride is used for exchanging in traditional production. The 5A molecular sieve of the invention has large adsorption capacity, high adsorption and desorption speed and high mechanical strength, the nitrogen adsorption capacity is larger than 15ml / g, the nitrogen-oxygen adsorption ratio is larger than 3.2, the carbon monoxide adsorption capacity is larger than 30ml / g, and the compression strength is larger than 50N. The product is used for pressure swing adsorption and oxygen production, the purification of hydrogen gas and carbon monoxide and the dewaxing of petroleum refineries.

Description

technical field [0001] The invention relates to a preparation method of a molecular sieve, in particular to a preparation method of a high-performance 5A molecular sieve for pressure swing adsorption. Background technique [0002] As a chemical unit technology, pressure swing adsorption (PSA) has been widely used in the separation and purification of mixed gases. With the development of pressure swing adsorption technology and the enlargement of equipment, if the treatment gas volume is 200000Nm 3 The device for separating and purifying hydrogen per hour also puts forward higher requirements for the adsorbent, which requires the adsorbent to have a large adsorption capacity, fast adsorption and desorption rates, and high mechanical strength. At the same time, with the development of the national economy and the strengthening of the country's environmental protection, wastewater treatment in the production of adsorbents is also a problem faced by adsorbent manufacturers. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/30B01D53/047
Inventor 李东林苏为民
Owner 都江堰清天新材料技术有限责任公司
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