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Improved diesel hydrocracking catalyst and preparing method thereof

A hydrocracking and catalyst technology is applied in the field of an improved diesel hydrocracking catalyst and its preparation, which can solve the problems of general middle distillate product quality and low catalytic activity of the catalyst, achieve high selectivity and avoid secondary side reactions , the effect of good middle distillate selectivity

Active Publication Date: 2017-07-07
WUHAN KAIDI ENG TECH RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN1393521A discloses a medium-oil type hydrocracking catalyst and its preparation method. The carrier used in the catalyst is amorphous silica-alumina, alumina and composite molecular sieves of Y and β, wherein the composite molecular sieve is obtained by burning the former powder of β molecular sieve to remove the template agent. After mixing with modified Y molecular sieve, it is obtained by ammonium exchange treatment. The catalytic activity of this catalyst is not high, and the product quality of middle distillates of jet fuel and diesel oil is average, which needs to be further improved.

Method used

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  • Improved diesel hydrocracking catalyst and preparing method thereof

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Embodiment 1

[0035] Take by weighing 201.3g tetraethylammonium bromide (98wt%, technical grade), 27.39g sodium hydroxide, 7.2g pseudo-boehmite (70wt%, technical grade), 870g water mix and stir to clear solution, then in Add 180g of white carbon black (98wt%, technical grade) to the solution under constant stirring, and continue to stir to obtain a uniform silica-alumina gel; the silica-alumina gel was dynamically crystallized at 145°C for 7 days, and the solid-liquid separation and After washing and drying, the β molecular sieve was obtained, coded as B1. The main properties of the β molecular sieve are shown in Table 1.

[0036] Add 3000ml of aluminum chloride solution (concentration: 1.5mol / L) into a 5000ml beaker, add 19g of B1 molecular sieve (99% on a dry basis) into the mixture, keep the temperature at 70°C, and continuously add 2mol / L of ammonia water until the pH value is 4 , evaporated at 85°C, dried the sucked white solid at 100°C for 3 hours, and roasted at 500°C for 4 hours to ...

Embodiment 2

[0039] Take by weighing 201.3g tetraethylammonium bromide (98wt%, technical grade), 27.39g sodium hydroxide, 7.2g pseudo-boehmite (70wt%, technical grade), 870g water mix and stir to clear solution, then in Add 180g of white carbon black (98wt%, technical grade) to the solution under constant stirring, and continue to stir to obtain a uniform silica-alumina gel; the silica-alumina gel was dynamically crystallized at 145°C for 7 days, and the solid-liquid separation and After washing and drying, the β molecular sieve was obtained, coded as B1. The main properties of the β molecular sieve are shown in Table 1.

[0040] Add 3000ml of aluminum chloride solution (concentration: 1.5mol / L) into a 5000ml beaker, add 28g of B1 molecular sieve (99% on a dry basis) into the mixture, keep the temperature at 70°C, and continuously add 2mol / L of ammonia water until the pH value is 4 , evaporated at 85°C, dried the sucked white solid at 100°C for 3 hours, and roasted at 500°C for 4 hours to ...

Embodiment 3

[0043] Take by weighing 185.3g tetraethylammonium bromide (98wt%, technical grade), 22.65g sodium hydroxide, 10.3g pseudo-boehmite (70wt%, technical grade), 870g water mix and stir to clear solution, then in Add 180g of white carbon black (industrial grade) to the solution under constant stirring, and continue to stir to obtain a uniform silica-alumina gel; dynamically crystallize the silica-alumina gel at 145°C for 7 days, and after solid-liquid separation and washing and drying The β molecular sieve was obtained, coded as B2, and the main properties of the β molecular sieve are shown in Table 1.

[0044] Add 3000ml of aluminum chloride solution (concentration: 1.5mol / L) into a 5000ml beaker, add 60.5g of B2 molecular sieve (99% on a dry basis) into the mixture, keep the temperature at 70°C, and continuously add 2mol / L of ammonia water until the pH is 4. Evaporate at 85°C, dry the sucked white solid at 100°C for 3 hours, and roast at 500°C for 4 hours to obtain 296.4g (dry ba...

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Abstract

The invention discloses an improved diesel hydrocracking catalyst and a preparing method thereof. Raw materials of the catalyst includes, by weight, 4-25% of molecular sieve, 10-65% of gamma-Al2O3, 15-70% of amorphous silica-alumina, 9-40% of binder and 7-35% of active metal oxide, the specific surface area of the catalyst is 220-450 m<2> / g, and the total pore volume is 0.30-0.73 cm<3> / g. Molecular sieve with an template agent not removed is added in the process of preparing a molecular sieve and aluminum oxide composite material, NH4+ generated through aluminum salt and ammonia water reaction exchanges with alkali Na+ for balancing negative charges of a molecular sieve skeleton in a mixed solution, the organic template agent and NH4+ in the molecular sieve are simultaneously removed in the calcinations process, ammonium exchange and template agent removal of the zeolite molecular sieve are completed in the process of preparing the composite material, the step of individually conducting template agent removal and ammonium exchange on the molecular sieve, the template agent has the effects of supporting and protecting the molecular sieve pore structure, and the catalyst can obviously reduce the condensation point of diesel fraction and increase the cetane number of diesel on the premise of ensuring the high diesel yield.

Description

technical field [0001] The invention relates to a catalyst, in particular to an improved diesel hydrocracking catalyst and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of my country's economy, the demand for various oil products has grown rapidly, and the demand for diesel oil has always ranked first among various petroleum products. Restricted by the original characteristics of the processing and the processing flow, the output of diesel oil, especially the output of low freezing point diesel oil, is limited by the freezing point of distillate oil, which has become a "bottleneck" problem restricting the economic benefits of northern oil refineries. Therefore, improving the quality and output of low-condensation-point diesel to meet market demand is still a matter of great concern to enterprises. This also puts forward higher requirements for the hydrocracking technology, and the catalyst plays a central role in the...

Claims

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Application Information

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IPC IPC(8): B01J29/78B01J35/10B01J35/02
CPCB01J29/7815B01J2229/20B01J35/40B01J35/615B01J35/635B01J35/633
Inventor 明卫星冯春峰赵焘朱吟昊施苗
Owner WUHAN KAIDI ENG TECH RES INST CO LTD
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