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Hydrodewaxing catalyst for diesel oil distillate and its preparing method

A hydrogen decondensation and catalyst technology, which is applied in the recovery of petroleum wax, etc., can solve the problems of large proportion of strong acid, entry of reactants, and many acid sites on the surface, so as to achieve good matching, promote rapid progress, and improve diesel performance Effect

Active Publication Date: 2007-04-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composite molecular sieve used has not been modified. It may be due to the large number of acid sites on the surface and the large proportion of strong acid, which leads to side reactions such as cracking. Cracking occurs inside the pores, so the liquid yield still has the potential to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of Mo-modified ZSM-5

[0034] Get 3000 grams of HZSM-5 zeolite with a silicon-aluminum mol ratio of 55, add to 2000 grams of (NH 4 ) 6 Mo 7 o 24 .4H 2 O and 6000 milliliters of water, heated up to 40 ± 10 ° C and maintained at this temperature for 2 hours, filtered and dried at 120 ° C for 4 hours, then roasted at 550 ° C for 3 hours to obtain 3320 grams of Mo-modified ZSM-5 zeolite, where MoO 3 The content is 12wt%, and its physical and chemical properties are shown in Table 1.

[0035] (2) Prepare W-modified ZSM-5

[0036] Get 3000 grams of HZSM-5 zeolite with a silicon-aluminum mol ratio of 55, add to 4000 grams of (NH 4 ) 6 h 2 W 12 o 40 and 6000 milliliters of water, kept at room temperature for 6 hours, filtered and dried at 100°C for 8 hours, then roasted at 650°C for 2 hours to obtain 3650 grams of W-modified ZSM-5 zeolite, wherein WO 3 The content is 19wt%, and its physical and chemical properties are shown in Table 1.

[0037] (3) ...

Embodiment 2

[0044] A kind of preparation method of pour point depressing catalyst

[0045] 100 grams (dry basis) of Mo-ZSM-5 (1) prepared in Example 1, 100 grams (dry basis) of W-ZSM-22 (5), 50 grams of SB powder prepared in Example 1, 220 grams of deionized water , 7.5 milliliters of concentrated nitric acid were uniformly mixed, kneaded, then extruded into a cylindrical bar with a diameter of 1.4 mm, dried at 120°C for 8 hours, and roasted at 550°C for 4 hours to obtain the catalyst carrier S provided by the invention 2 . Take 100 grams of carrier S 2 , at room temperature, impregnate the carrier S with an aqueous solution dissolved in 10 g of nickel nitrate 2 After two hours, filter, dry at 110°C for 6 hours, and roast at 500°C for 4 hours to obtain catalyst E of the present invention 2 . Catalyst E 2 The calculation composition is shown in Table 2.

Embodiment 3～5

[0047] A kind of preparation method of pour point depressing catalyst

[0048] Carrier and catalyst were prepared according to the method of Example 2, the difference was that the type and proportion of modified molecular sieves used were different, and the content of hydrogenation metal components was different, and catalyst E was obtained respectively. 3 ~E 5 , and its calculated composition is shown in Table 2.

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PUM

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Abstract

The invention disclosed a catalyst to lower the freezing point of the diesel oil. The catalyst includes carrier that contains reshaped molecular sieve and hydrogenated metal. The molecular sieve is reshaped by VIB group metal, the content of which in the molecular sieve is 1wt%-40wt% (by oxidation state). The content of the molecular sieve and the metal are 10wt%-90wt% (by oxidation state) and 0.1wt%-40wt% (by oxidation state) respectively. The reshaping agent can modify the acid substance and the bore size on the surface of the molecular sieve so as to match the catalyst's isomerizing function and structure-selective splitting function well; it can make the splitting reaction proceeds according to the lock-and-key mechnanism and ensure the reaction proceeds properly without over splitting; it can improve the quality of the diesel oil and increase its yield. The invention can be used in the deparaffinage of the material that contains wax, especially in the process to lower the freezing point of the diesel oil distillate. It can not only lower the freezing point, but also increase the diesel oil yield substantially.

Description

technical field [0001] The invention relates to a hydrodewaxing catalyst and a preparation method thereof, more specifically, to a diesel fraction hydrodecondensation catalyst and a preparation method thereof. Background technique [0002] If the diesel fraction contains a lot of wax, it has a high freezing point and poor low-temperature fluidity. During storage, transportation and use, the diesel will thicken or even solidify as the ambient temperature decreases, thereby blocking the oil pipeline and interrupting the engine's supply. Oil makes the engine malfunction. At present, there are many methods to solve various problems caused by solidification of waxy diesel oil, and the main method is dewaxing, including solvent dewaxing, catalytic dewaxing and isomerization dewaxing. [0003] Solvent dewaxing is to use the solubility of wax in solvent to remove it. The disadvantage of this method is that it is difficult to choose solvent, waste a lot of organic solvent, harmful t...

Claims

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Application Information

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IPC IPC(8): C10G73/02
Inventor 刘全杰徐会青贾立明王伟
Owner CHINA PETROLEUM & CHEM CORP
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