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Selective hydrogenation method

A selective, hydrogen-oil technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, etc., can solve problems such as decline and catalyst activity decline, and achieve mature technology, Effects of extended life and simple reactor structure

Pending Publication Date: 2022-02-22
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The reduction temperature of Ni often reaches about 450°C. At this temperature, Pd atoms in the reduced state are easy to aggregate, which greatly reduces the activity of the catalyst. It is necessary to increase the active component to compensate for the loss of activity, but it will cause selection decline of sex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0062] Embodiment uses the preparation of catalyst 1~6

[0063] Preparation of Catalyst C1:

[0064] Catalyst carrier preparation: commercially available bimodal pore distribution spherical alumina carrier with a diameter of 3-4mm was used. After calcination at 950°C for 4 hours, the pore size distribution ranges were 10-25nm and 50-270nm respectively, the water absorption rate was 72%, and the specific surface area 146m 2 / g, weigh the carrier 150g.

[0065] Catalyst preparation:

[0066] (1) Palladium chloride is prepared as an active component impregnation solution, and the pH is adjusted to 2.0, then the carrier is added to the Pd salt solution, after impregnation and adsorption for 3 hours, dried at 100°C for 4h, and roasted at 550°C for 2h to obtain a semi-finished catalyst C1-A.

[0067] (2) The ammonium metatungstate is completely dissolved into the impregnating solution, impregnated with equal volume, impregnated the semi-finished catalyst C1-A in the prepared sol...

Embodiment 1

[0126] Using C6-C7 distillate as raw material, at an inlet temperature of 50°C, a reaction pressure of 3.0MPa, and a liquid hourly space velocity of 2.0h -1 1. Run for 500 hours under the condition of hydrogen oil volume ratio of 200:1, and sample and analyze the diene value and bromine value in the product every 24 hours. The average value of the analysis results is shown in Table 3.

Embodiment 2

[0131] Using C6-C7 distillate as raw material, at an inlet temperature of 40°C, a reaction pressure of 3.5MPa, and a liquid hourly space velocity of 2.0h -1 1. Run for 500 hours under the condition of hydrogen-oil volume ratio of 300:1, and sample and analyze the diene value and bromine value in the product every 24 hours. The average value of the analysis results is shown in Table 3.

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Abstract

The invention provides a selective hydrogenation method, which adopts a fixed bed reactor, wherein the reactor is filled with a hydrogenation catalyst which has a bimodal pore distribution structure and at least contains Pd, W, Ni and Cu, pyrolysis gasoline and hydrogen are mixed and preheated and then enter the reactor, and the hydrogenation process conditions are that the reaction temperature is 30-120 DEG C, the reaction pressure is 2-6 MPa, the air speed is 0.5-4 h<-1>, and the volume ratio of hydrogen to oil is (100-600):1. According to the invention, a catalyst carrier used in the hydrogenation method is alumina or mainly alumina and has a bimodal pore distribution structure, active components of the catalyst at least contain Pd, W, Ni and Cu, and the hydrogenation method is characterized in that Ni and Cu are loaded in a microemulsion manner, so that Ni and Cu are mainly distributed in the macropores of the carrier; W is loaded by a solution method, Pd is loaded by a solution method and a microemulsion method, most of Pd is loaded by the solution method, and a small part of Pd is loaded by the microemulsion method; and the hydrogenation method has the characteristics of high hydrogenation activity, good selectivity and strong operation stability.

Description

technical field [0001] The invention relates to a selective hydrogenation method, in particular to a selective hydrogenation method for pyrolysis gasoline fractions. Background technique [0002] Pyrolysis gasoline is an important by-product of steam cracking ethylene plant, and its output is 50%-80% (mass fraction) of the ethylene production capacity. The content of aromatics is as high as 50%, and it is an important raw material for extracting aromatics. Pyrolysis gasoline also contains a large amount of unsaturated hydrocarbons (dienes, monoenes) and impurities such as sulfur and nitrogen, resulting in poor stability of pyrolysis gasoline and the formation of colloids, and these unsaturated hydrocarbons and impurities such as sulfur and nitrogen will increase significantly Reducing the selectivity of the extractant when extracting aromatics seriously affects the purity and color of aromatics products. Therefore, pyrolysis gasoline must be hydrotreated to remove impurities...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G45/08B01J23/89B01J35/10B01J37/02B01J37/18
CPCC10G45/08B01J23/8993B01J23/002B01J37/0213B01J37/0205B01J37/18B01J2523/00B01J35/613B01J35/651B01J35/69B01J35/647B01J35/615B01J2523/17B01J2523/31B01J2523/69B01J2523/824B01J2523/847
Inventor 梁顺琴吕龙刚王斌展学成孙利民胡晓丽马好文鲁鹏何崇慧王书峰
Owner PETROCHINA CO LTD
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