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Diesel fuel fraction isomeric pour point depression catalyst and prep. thereof

A technology for isomeric pour point depressurization and catalyst, which is used in molecular sieve catalysts, physical/chemical process catalysts, petroleum industry and other directions, can solve the problems of decreased crystallinity of zeolite, large damage of zeolite, dealumination, etc., and achieves high cetane number, Low sulfur and nitrogen content and good stability

Inactive Publication Date: 2003-10-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, due to the fact that the hydrogen-type β zeolite has more acid sites, stronger acidity, and widespread acid distribution, some acid sites distributed on the outer surface of the zeolite have no selectivity. When used for the treatment of diesel fractions, some macromolecules are cracked The low yield of diesel fractions is a small molecule with low value. To solve this problem, people carry out further treatment on β zeolite, mainly by means of chemical dealumination, water vapor dealumination and introduction of auxiliary components, etc., USP.5522984, 5227558, 5139721 , 5294332, ZL.94107294.0, 96119899.0, 93117593.3 and 96100047.3 respectively reported the modification methods of zeolite beta, mainly through dealumination of chemical substances, high temperature steam treatment and adding auxiliary components
However, the common problem in the current methods is that the processing steps are complicated, and the zeolite is greatly damaged during dealumination, especially during acid dealumination, which reduces the crystallinity of the zeolite. In addition, selective dealumination and accurate control of local acidity cannot be performed, resulting in The acidity of zeolite after dealumination cannot meet the actual needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The following examples will further illustrate the preparation process and technical points of the catalyst of the present invention, but it should not be considered that the present invention is limited to the following examples. Embodiment 1 A kind of modification method of zeolite beta

[0030] (1) Take 200g Naβ zeolite (SiO 2 / Al 2 o 3 =24.35,Na 2 O: 3.75w%, produced by Fushun Petroleum No. 3 Factory) was added to a beaker containing 1500ml of 15w% ammonium nitrate solution, stirred at 90°C for 1h, and repeated once, the solid matter was dried at 110°C for 10h, and roasted at 550°C for 4h to obtain the hydrogen form Zeolite, which contains 0.08w% Na 2 O (based on the mass of zeolite) is denoted as βa1.

[0031] (2) Take 200g of zeolite βa1, add it to a beaker containing 1200ml of 0.20M hydrochloric acid solution, stir at 60°C for 2h, wash with distilled water until neutral, and dry at 130°C for 4h to obtain zeolite as βb1;

[0032] (3) Get 100g zeolite βb1, jo...

Embodiment 2

[0032] (3) Get 100g zeolite βb1, join in the round-bottomed flask that contains the 1000ml anhydrous tetrahydrofuran solution of tetrahydrofuran solution containing 2w% of ethyl orthosilicate, heat and reflux under stirring for 3h, filter out the solid matter, wash with absolute ethanol, Then wash with distilled water, dry at 110°C for 8 hours, and roast at 480°C for 8 hours to obtain modified β zeolite, which is denoted as βc1 and loaded with SiO 2 It is 1.0w% (based on the zeolite mass), and the main properties are shown in Table 1. Embodiment 2 A kind of modification method of zeolite beta

[0033] (1) Get 200g Naβ zeolite (same as Example 1) and join in the beaker that the ammonium sulfate solution of 1500ml10w% is housed, stir 4h at 60 ℃, repeat operation twice, dry 2h at 160 ℃ of solid matter, roast 8h at 480 ℃ to obtain Hydrogen type zeolite containing 0.12w% Na 2 O (based on the mass of zeolite) is denoted as βa2.

[0034] (2) Take 200g of zeolite βa2, add it to a b...

Embodiment 3

[0035] (3) Get 100g of zeolite βb2, add it into a round bottom flask containing 700ml of anhydrous toluene solution containing 5w% of 3-aminopropyltriethoxysilane, stir at 80°C for 6h, filter out the solid matter, and use acetone Wash, then wash with distilled water, dry at 130°C for 5h, and roast at 560°C for 4h to obtain modified β zeolite, denoted as βc2, loaded with SiO 2 It is 1.4w% (based on the zeolite mass), and the main properties are shown in Table 1. Embodiment 3 A kind of modification method of zeolite beta

[0036] (1) Get 200g Naβ zeolite (same as Example 1) and join in the beaker that the ammonium chloride solution of 500ml20w% is housed, stir 4h at normal temperature, repeat operation twice, solid matter 110 ℃ of drying 6h, 580 ℃ of roasting 3h Obtain hydrogen zeolite, which contains 0.33w% Na 2 O (based on the mass of zeolite) is denoted as βa3.

[0037] (2) Take 200g of zeolite βa3, add it to a beaker containing 800ml of 0.1M nitric acid solution, stir at ...

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Abstract

The present invention discloses one kind of catalyst for producing low-freezing point clean diesel oil and its preparation. The catalyst has modified beta-zeolite as its acid component and the zeolite modifying process is to make siliceous organic matter with relatively dynamic diameter contact with zeolite in certain condition so that the organic matter is combined with the acid centers on the outer surface of zeolite to deactivate while maintaining the acid centers inside the pore passages of zeolite. The catalyst is used in producing low-freezing point clean diesel oil, and has the advantages of high yield and cetane number, low sulfur and nitrogen content and low low-freezing point of diesel oil product, etc.

Description

1. Technical field [0001] The invention discloses a heterogeneous pour point depressant catalyst for producing clean diesel oil with low pour point and a preparation method thereof. 2. Background technology [0002] In order to meet the requirements of product quality and environmental protection regulations, petroleum products must be refined before sale to remove harmful substances. Current environmental protection regulations have put forward stricter standards for sulfur, aromatics content and cetane number in diesel. In addition, most of the high-yield crude oil in my country is paraffin-based crude oil. The diesel fraction produced contains more wax, has a higher freezing point, and has poor low-temperature fluidity. During storage, transportation, and use, as the ambient temperature decreases, the Diesel thickens and even freezes, clogging oil lines and interrupting the fuel supply to the engine, causing the engine to fail. At present, there are many methods to solve ...

Claims

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Application Information

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IPC IPC(8): B01J29/04C10G45/64
Inventor 刘全杰杨军彭焱王伟
Owner CHINA PETROLEUM & CHEM CORP
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