Method for modifying catalytic cracking equilibrium agent

Abstract

The invention relates to a method for modifying a catalytic cracking equilibrium agent. The method comprises the following steps: 1) roasting the catalytic cracking equilibrium agent at the temperature of 250-900 DEG C; 2) dumping the roasted catalytic cracking equilibrium agent obtained in the step 1) in an acid solution, processing the materials at the temperature between room temperature and 100 DEG C for 10min-5h, and drying the materials after processing; 3) mixing the catalytic cracking equilibrium agent obtained in the step 2) and a solution of water-soluble metal salt at the temperature between room temperature and 100 DEG C and exchanging for 10min-5h, then drying the materials, and roasting the material; wherein the mass ratio of the metal ions to the catalytic cracking equilibrium agent is 0.05-20%. The micro-activity of the catalytic cracking equilibrium agent processed by the method is increased by 5-16 units, and the hydro-thermal stability is improved.

Description

technical field [0001] The invention relates to a method for modifying a catalytic cracking balancer. More specifically, it relates to a method for reactivating a catalytic cracking balancer. Background technique [0002] The catalytic cracking process is the core process of the refinery, and it is responsible for the production of gasoline, diesel and liquefied gas from heavy oil and residual oil. Y-type molecular sieves and type-selective molecular sieves such as ZSM-5, ZRP series molecular sieves, etc. Mainly used catalytic materials, catalysts containing these two molecular sieves have to undergo a reaction-regeneration cycle repeatedly under high temperature and hydrothermal conditions. The structure of some molecular sieves will collapse and destroy, and heavy metals will deposit and cause poisoning, reducing catalyst activity and selectivity. As a result, the production of hydrogen and coke has increased, and the production of gasoline and light oil has dropped signi...

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Problems solved by technology

[0004] CN1078100C discloses a reprocessing method of a balancing agent, which is to use a balancing agent containing Na 2 The O source and the optional NaCl aqueous solution are treated at 80-110°C for 10-30 hours, or after ion exchange and drying, the regenerated catalyst is obtained. The activity recovery is relatively good, but the cleaning effect on the pores is limited and does not complete regenerative effect

[0005] CN1050402A discloses a catalyst demetallization method, the method uses chelating agents such as citric acid to react with Ni on the catalyst to generate a chelate, and then washes with water to remove Ni from the catalyst. The method has mild conditions, but the metal The extraction rate is very low and the efficiency is not high

[0006] CN1072617A discloses a regeneration method of a balancing agent. The method is to mix and roast the balancing agent and an ammonium salt. The product is washed with water, filtered or ion-exchanged, and dried to obtain a regenerated catalyst. The method emphasizes the metal extraction rate, but the decomposition of the ammonium salt produces The strong acid will destroy the molecular sieve crystal structure at high temperature, and the activity will decrease instead.

The mass ratio of the rare earth and metal salt to the catalyst used in this method is about 10-20%, the cost is huge, and the economic benefit is not obvious

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