A kind of modified clay catalyst for deolefin and preparation method thereof

A technology for de-olefins and catalysts, which is applied in the field of catalysts for trace olefins, can solve the problems of poor regeneration performance and expensive catalysts for de-olefins, and achieve the effects of reducing acid strength, reducing coking and carbon deposition, and overcoming easy deactivation

Inactive Publication Date: 2016-01-06
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the disadvantages of high price and poor regeneration performance of deolefinization catalysts in the prior art, the present invention provides a modified clay catalyst for deolefinization and its preparation method. The catalyst is prepared from low-cost clay as a raw material. It has Very good catalyst activity and stability, and can be regenerated, can be reused many times, and the regeneration process is simple

Method used

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  • A kind of modified clay catalyst for deolefin and preparation method thereof
  • A kind of modified clay catalyst for deolefin and preparation method thereof
  • A kind of modified clay catalyst for deolefin and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] Take 14.5g of pretreated attapulgite clay, add 39ml of lanthanum nitrate solution containing 0.5% (mass fraction) of lanthanum, stir and ultrasonically 1h; then add 1g of phosphotungstic acid roasted at 180°C to the slurry, and continue stirring for 1h , then soaked for 14h and dried. The modified attapulgite clay loaded with two active components was obtained.

[0032] Take 6.4g of pseudo-boehmite and 40ml of water into a beaker, and stir to form a solution. Get all the modified attapulgite clay prepared above into the beaker. Stir under heating until the solution is evaporated to dryness, and the heating temperature is 70°C.

[0033] After drying, add 0.2g of scallop powder to the dried powder, add dilute nitric acid dropwise to adjust to the degree suitable for extruding, extrude on a screw extruder, then dry, and finally roast at 450°C for 2.5h . Denoted as catalyst A.

[0034] from figure 1 It can be seen that the structure of catalyst A is as follows: rare e...

Embodiment 2

[0036]Take 16g of pretreated attapulgite clay, add 40ml of neodymium nitrate solution containing 1% (mass fraction) of neodymium, stir and ultrasonically 1.2h; then add 1.2g of phosphotungstic acid roasted at 200°C to the slurry, and continue stirring 1.5h, then soaked for 12h, and dried. The modified attapulgite clay loaded with two active components was obtained.

[0037] Take 7.8g of aluminum sol and 24ml of water into a beaker, and stir to form a solution. Get all the modified attapulgite clay prepared above into the beaker. Stir under heating conditions until the solution is evaporated to dryness, and the heating temperature is 60°C.

[0038] After drying, add 0.1g of squat powder to the dried powder, add dilute nitric acid dropwise to adjust to the extent suitable for extruding, extrude on a screw extruder, then dry, and finally roast at 350°C for 3h. Denoted as Catalyst B.

Embodiment 3

[0040] Take 12g of pretreated attapulgite clay, add 34ml of cerium ammonium nitrate solution containing 0.3% (mass fraction) of cerium, stir and ultrasonically 1.5h; then add 2g of molybdosilicic acid roasted at 150°C to the slurry, and continue stirring 2h, then soaked for 14h, and dried. The modified attapulgite clay loaded with two active components was obtained.

[0041] Take 8.1g of diaspore and 45ml of water into a beaker, and stir to form a solution. Get all the modified attapulgite clay prepared above into the beaker. Stir under heating until the solution is evaporated to dryness, and the heating temperature is 50°C.

[0042] After drying, add 0.2g squat powder to the dried powder, add dilute nitric acid dropwise to adjust to the extent suitable for extruding, extrude on a screw extruder, then dry, and finally roast at 250°C for 4h. Denoted as catalyst C.

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Abstract

The invention discloses a modified clay catalyst for removing olefin. The modified clay catalyst comprises the following components in parts by weight: 60-80 parts of clay, 1-10 parts of heteropoly acid, 0.1-2 parts of rare-earth elements and 10-40 parts of aluminium solution (according to the content of Al2O3). The rare-earth elements are loaded in pore channels of clay, and the heteropoly acid is loaded on the surface of the clay; the Al2O3 coats the clay. The modified clay catalyst is prepared by adopting the clay with low cost as the material, has good activity and stability and can be regenerated and circularly used for multiple times after being inactivated. Shown by experiment, the modified clay has higher activity than that of fresh active activated clay after being circularly used for 4 times, so that the modified clay catalyst has obvious economic benefit.

Description

technical field [0001] The invention relates to a modified clay catalyst, especially a catalyst for removing trace olefins in reformed oil. Background technique [0002] Reformed oil contains various components, the main components are aromatics, the most important of which are benzene, toluene and xylene. "Triphenyl" occupies an extremely important position in petroleum products, and it is mainly produced through processes such as naphtha reforming and steam cracking. However, the BTX products produced by these processes all contain a certain amount of olefin impurities, generally with a mass fraction of less than 1% in the product composition. These olefin impurities are very active in nature and are easy to polymerize to form colloids that affect the quality of aromatic products. Some chemical processes have adverse effects, affecting the further processing and utilization of aromatics. For example, in the reboiler of some xylene rectification towers with very high temp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/26C10G29/04
Inventor 李为民纪飞郑爱华潘晶晶任庆功姚超
Owner CHANGZHOU UNIV
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