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USY type molecular sieve modification method and application thereof

A molecular sieve and modification technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems affecting the spatial structure of molecular sieves, affecting the stability of molecular sieves, and destroying molecular sieve crystals. It achieves good water solubility, The effect of enriching the secondary pore structure and improving the utilization rate

Pending Publication Date: 2022-05-27
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After high-temperature hydrothermal treatment, polymerized non-skeleton aluminum species will be formed near the crystal surface, which affects the spatial structure of molecular sieves and is not conducive to reaction and mass transfer; The use of molecular sieves will lead to serious damage to molecular sieve crystals, large loss of crystallinity, excessive dealumination and even seriously affect the stability of molecular sieves; in the composite dealumination method, there are often two reagents competing with each other in the dealumination process, which affects the dealumination effect.

Method used

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  • USY type molecular sieve modification method and application thereof
  • USY type molecular sieve modification method and application thereof
  • USY type molecular sieve modification method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This example mainly investigates the selection of organic acid components in the organic acid-chelating agent composite dealumination modifier. Five common organic acids, tartaric acid, citric acid, oxalic acid, succinic acid and malic acid, were used to treat the same commercial USY molecular sieve at a concentration of 0.3 mol / L. "USY" stands for commercial ultra-stable Y molecular sieve, "DAY-N", "DAY-H", "DAY-C", "DAY-P", "DAY-J" stand for citric acid, succinic acid, The samples prepared by treating Y molecular sieves with oxalic acid, malic acid and tartaric acid, the specific surface area and pore structure data of each sample are shown in Table 1 below:

[0048] Table 1Y Specific surface area and pore structure data of molecular sieves

[0049]

[0050] figure 1 In this example, the XRD patterns and partial enlarged spectra of Y molecular sieves treated with different organic acids are shown. like figure 1 As can be seen from the results shown in Table 1 a...

Embodiment 2

[0055] This example investigates the effect of the composite modifier and compares the structural properties of the samples modified with citric acid, chelating agent and industrial USY molecular sieve.

[0056] At room temperature, add 5g of industrial USY molecular sieve into a 250mL three-necked flask, and then add 25mL of 0.3mol L -1 Add 0.3mol L of citric acid solution at the same time -1 25 mL of disodium EDTA solution, vigorously stirred at 80 °C for 4 h. After the reaction was completed, the resulting milky white suspension was filtered, washed until neutral, and dried at 110° C. for 12 h. The sample number "USY" stands for industrial USY molecular sieve, "DAY-E" for disodium EDTA modification, "DAY-N" for citric acid modification, and "DAY-EN" for compound modification. The characterization results of the effect comparison of the composite modifier are shown in Table 3 below:

[0057] Table 3 Effects of different modifiers on the crystal structure of USY molecular ...

Embodiment 3

[0066] In this example, the influence of experimental conditions on the modification effect was investigated, and the parameters such as modifier concentration, reaction time and reaction temperature were mainly investigated. 2 / Al 2 O 3 The higher the value, the more suitable it is to prepare the modified Y molecular sieve with small unit cell and high stability.

[0067] At room temperature, adjust the concentration of citric acid solution and the concentration of disodium EDTA solution, using 0.2mol·L respectively. -1 , 0.3mol·L -1 , 0.4mol·L -1 and 0.5mol·L -1 ; Adjust the reaction time and use 3h, 4h, 5h and 6h respectively; adjust the reaction temperature and use 70°C, 80°C, 90°C and 100°C respectively.

[0068] Influence of reaction conditions on modification effect

[0069]Table 5 shows the effect of different modifiers in Example 3 on the crystal structure of USY molecular sieve. From the weighting factor of the experimental conditions, the concentration of cit...

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Abstract

The invention provides a USY type molecular sieve modification method and application thereof.The USY type molecular sieve modification method comprises the following steps that an industrial USY molecular sieve is added into an organic acid-chelating agent composite dealumination modifier according to the solid-to-liquid ratio under the stirring condition, stirring continues to be conducted, a reaction is conducted, and milk white turbid liquid is obtained; and washing the milky white suspension until the milky white suspension is neutral, and drying to obtain the modified USY type molecular sieve. According to the novel method for preparing the modified USY type molecular sieve by utilizing the synergistic effect of the organic acid and the chelating agent, the modified USY type molecular sieve has the structural characteristics of large specific surface and small unit cell parameters.

Description

technical field [0001] The invention relates to the technical field of modification of industrial USY type molecular sieves, in particular to a modification method of USY type molecular sieves with the characteristics of large specific surface and small unit cell parameters by utilizing organic acid-chelating agent synergy and application thereof. Background technique [0002] As one of the important secondary processing methods for the lightening of heavy oil, hydrocracking technology is widely used in refineries and refineries due to its wide range of processing raw materials, wide variety of products with good quality, high production flexibility and high yield of liquid products. play an important role in the production of clean fuels. In order to meet the increasing demand for light distillate oil worldwide, the research and development of new and productive light oil hydrocracking catalysts has become the core and key of this technology. From the current research situ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08B01J35/10C10G47/16
CPCB01J29/084B01J37/0018C10G47/16B01J2229/16B01J2229/37B01J2229/24C10G2300/70C10G2400/04C10G2400/02B01J35/617B01J35/633Y02P30/20
Inventor 袁晓亮乔柯王晶晶余颖龙赵梓贺王延飞张雅琳张占全王燕阎子峰
Owner PETROCHINA CO LTD
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