A kind of preparation method of hydrocracking catalyst with high light oil selectivity

A hydrocracking and catalyst technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problem of low octane number of naphtha

Active Publication Date: 2021-04-09
中国中化股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with catalytic cracking, its raw material adaptability is high, the yield of diesel fraction is high, and the quality is good, but the octane number of naphtha is relatively low

Method used

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  • A kind of preparation method of hydrocracking catalyst with high light oil selectivity
  • A kind of preparation method of hydrocracking catalyst with high light oil selectivity
  • A kind of preparation method of hydrocracking catalyst with high light oil selectivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: Preparation of Y molecular sieve Z1

[0033] Prepare 2000mL of 3wt% dilute nitric acid solution, add 500g of Y molecular sieve Z0 to it, stir vigorously at 50°C for 4h, settle for 2-3h, pour out most of the upper liquid, centrifuge the remaining solid and a small amount of liquid, and centrifuge the solid Add 250mL deionized water, stir and wash, and centrifuge. Repeat centrifugation and washing for 3 times, and finally the molecular sieve solid obtained by centrifugation is first dried at 150°C for 8 hours, and then calcined at 500°C for 4 hours in an air atmosphere to obtain acid-treated molecular sieve Z1.

Embodiment 2

[0034] Embodiment 2: Preparation of Y molecular sieve Z2

[0035] Prepare 1000mL, 1mol / L ethylenediaminetetraacetic acid (EDTA) ethanol solution, add 200g Y molecular sieve Z0 to it, stir vigorously at room temperature for 4 hours, settle for 2-3 hours, pour out most of the upper liquid, and carry out the remaining solid and a small amount of liquid After centrifugation, the centrifuged solid was added to 200 mL of ethanol, stirred, washed, and centrifuged. Repeat centrifugation and washing for 3 times, and finally the molecular sieve solid obtained by centrifugation is dried in a vacuum oven at 80°C for 6h, and then calcined at 500°C for 4h in an air atmosphere to obtain the treated molecular sieve Z2.

[0036] The properties of commercial Y molecular sieve Z0 and Y molecular sieves Z1 and Z2 prepared in Examples 1 and 2 are compared in Table 1.

[0037] Table 1 Performance comparison of different molecular sieves

[0038]

[0039] Depend on 27According to the character...

Embodiment 3

[0040] Example 3: Preparation of hydrocracking catalyst C1 (Z1+P1 (acid gel index 90%))

[0041] Weigh 110 g of pseudo-boehmite P1 (dry basis, unless otherwise specified, all weights of the following raw materials are dry basis), 80 g of imported amorphous silica-alumina, and 10 g of molecular sieve Z1, and fully mix the three solid powders Finally, add the pre-prepared dilute nitric acid solution (3.3g, 67wt% concentrated nitric acid diluted with 200 g deionized water), knead vigorously for 15 minutes, extrude through a 2.5mm orifice plate, and dry at 120°C for 6h. Calcined in air at 500°C for 4h to obtain the catalyst carrier. Then impregnate the carrier with a mixed aqueous solution of ammonium metatungstate and nickel nitrate in equal volume to load 18% W and 5.4% Ni (theoretical weight), and then dry it at 120°C for 4 hours, then dry it at 500°C in an air atmosphere Calcined for 4h, the resulting catalyst was marked as C1.

[0042] Implementation 4: Preparation of hydro...

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Abstract

The invention discloses a method for preparing a hydrocracking catalyst with high light oil selectivity, which comprises chemically treating the ultra-stable Y molecular sieve to remove amorphous aluminum in the pores, and after heat treatment, combined with pseudo-boehmite and amorphous silicon-alumina are jointly made into a carrier, and then impregnated and loaded with metal elements to make the hydrocracking catalyst with high light oil selectivity. The present invention removes the residual amorphous aluminum in the molecular sieve channel through a gentle chemical method to facilitate the diffusion of the primary cracking product without affecting its skeleton structure, and then kneads it with highly peptized pseudo-boehmite , which can make part of the amorphous aluminum diffuse to the outer surface of the molecular sieve to strengthen the acid center, which makes the final hydrocracking catalyst not only have higher light oil selectivity, but also maintain high activity, and because there is no The framework structure of the molecular sieve is changed to maintain high stability.

Description

technical field [0001] The invention specifically relates to a preparation method of a hydrocracking catalyst with high light oil selectivity. Background technique [0002] The hydrocracking process is an oil refining process that converts high-boiling feedstocks into low-boiling naphtha and diesel fractions. Compared with catalytic cracking, its raw material adaptability is high, the yield of diesel fraction is high, and the quality is good, but the octane number of naphtha is relatively low. As society's demand for clean transportation fuel oil continues to increase, the hydrocracking process has become one of the core processes of modern refineries. [0003] The hydrocracking catalyst is the core of the entire hydrocracking process, which usually includes a dual-functional center: one is the acidic center, provided by the carrier, which basically determines the activity of the catalyst. During the development of the hydrocracking catalyst, the acidic component has been u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/16C10G47/20
CPCB01J29/166B01J2229/18C10G47/20
Inventor 王理刘长坤吴锦添张黎范文青
Owner 中国中化股份有限公司
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