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Heavy oil catalytic cracking catalyst

A cracking catalyst, heavy oil catalysis technology, applied in catalytic cracking, physical/chemical process catalyst, molecular sieve catalyst and other directions, can solve problems such as low liquid yield, and achieve the effects of less dosage, improved conversion, and improved propylene yield

Inactive Publication Date: 2008-11-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst has higher propylene yield and raw material conversion rate, but lower liquid yield

Method used

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  • Heavy oil catalytic cracking catalyst
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Weigh 10.8 grams (0.18mol) of silica gel, 4.08 grams (0.050mol) of sodium metaaluminate, 5.67 grams (0.027mol) of tetraethylammonium bromide, 0.44 grams of beta seed crystals, and add 3.6 grams of sodium hydroxide (0.09mol) control OH - ratio, put it into a mixer for mechanical mixing, after fully stirring, put the mixture on the support, feed water vapor, maintain the system temperature at 130°C to start crystallization, the crystallization time is 4 days, and you can get beta-mercerized co- Crystal molecular sieve, XRD pattern see figure 1 .

Embodiment 2

[0019] Example 2: The eutectic molecular sieve prepared in Example 1 is conventionally modified, that is, the original powder of the eutectic molecular sieve that removes the template is replaced with 1mol / L NH 4 NO 3 The solutions were mixed in a three-necked flask, heated to 100°C in a heating mantle and stirred for 4 hours, washed, dried, and roasted to obtain hydrogen-type molecular sieves, so that the content of sodium oxide was lower than 0.1%, and the prepared hydrogen-type molecular sieves were heated at 800°C, Aged with 100% water vapor for 10 hours to obtain additive beta-mercerized eutectic molecular sieve A. Prepare catalyst B of the present invention by 35% USY type molecular sieve, 10% molecular sieve A, 20% acidified pseudo-boehmite, 10% aluminum sol binding agent, 25% kaolin, its preparation method is first The kaolin and pseudo-boehmite are fully mixed uniformly, and after acidification treatment, they are fully mixed with molecular sieves and binders, and fi...

Embodiment 3

[0027]Example 3: The molecular sieve A prepared in Example 1 was routinely modified to obtain a hydrogen-type molecular sieve, so that the sodium oxide content was lower than 0.1%, and the prepared catalyst was aged at 800° C. with 100% steam for 10 hours to obtain Agent beta mixed crystal molecular sieve A. Prepare catalyst C provided by the invention by 25% USY type molecular sieve, 20% beta-mercerized eutectic molecular sieve A, 20% acidified pseudo-boehmite, 10% aluminum sol binder, 25% kaolin . Its preparation method is to mix kaolin and pseudo-boehmite fully and uniformly first, and after acidification treatment, then fully mix with molecular sieve and binder, and finally spray-dry the obtained slurry into particles with a diameter of 40-150 microns and Roasting, obtains the catalyst provided by the invention. The drying temperature is 120° C., the firing temperature is 500° C., and the firing time is 1.5 hours. Catalyst C 2 Pretreatment with 100% steam for 10 hours ...

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Abstract

The invention relates to an RFCC catalyst which mainly uses a USY-typed molecular sieve and then adds a beta-mercerized eutectic molecular sieve assistant. Based on the weight percentage of the catalyst, the content of the USY-typed molecular sieve is 10 percent to 50 percent and the content of the beta-mercerized eutectic molecular sieve is 10 percent to 20 percent, a binder accounts for 5 percent to 50 percent and clay accounts for 10 percent to 75 percent. The beta-mercerized eutectic molecular sieve is a molecular sieve provided with the structural units of beta zeolite and mordenite. Compared with ZSM-5 with the same quantity of the assistant, the catalyst of the invention has obvious improvement in conversion ratio and liquid yield while obtaining comparatively high yield of propylene, furthermore, when used for synthesizing a template, the beta-mercerized eutectic molecular sieve has low consumption, low cost, and a practical application prospect for industrialization.

Description

technical field [0001] The invention relates to a heavy oil catalytic cracking catalyst, in particular to a catalyst containing Y-type molecular sieves and other molecular sieves as auxiliary agents. Background technique [0002] As the core of fluid catalytic cracking (FCC) process, the development of FCC catalyst is particularly important. With the increasingly serious trend of heavy and inferior quality of catalytic cracking raw oil and the development of petrochemical technology, new requirements are put forward for FCC catalysts, that is, to maintain a high conversion rate of raw oil and a high yield of liquid products , and at the same time require the FCC unit to produce more propylene. [0003] At present, most FCC catalysts are composed of Y-type molecular sieve and kaolin. Y-type molecular sieve has a strong acid cracking function. At the same time, Y-type zeolite belongs to faujasite and has a supercage structure with a large cavity, which makes it have good dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70C10G11/05
Inventor 陈标华李冰洁曹刚黄崇品
Owner BEIJING UNIV OF CHEM TECH
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